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      1 
      2  OpenSSL CHANGES
      3  _______________
      4 
      5  Changes between 1.0.1p and 1.0.1q [3 Dec 2015]
      6 
      7   *) Certificate verify crash with missing PSS parameter
      8 
      9      The signature verification routines will crash with a NULL pointer
     10      dereference if presented with an ASN.1 signature using the RSA PSS
     11      algorithm and absent mask generation function parameter. Since these
     12      routines are used to verify certificate signature algorithms this can be
     13      used to crash any certificate verification operation and exploited in a
     14      DoS attack. Any application which performs certificate verification is
     15      vulnerable including OpenSSL clients and servers which enable client
     16      authentication.
     17 
     18      This issue was reported to OpenSSL by Loc Jonas Etienne (Qnective AG).
     19      (CVE-2015-3194)
     20      [Stephen Henson]
     21 
     22   *) X509_ATTRIBUTE memory leak
     23 
     24      When presented with a malformed X509_ATTRIBUTE structure OpenSSL will leak
     25      memory. This structure is used by the PKCS#7 and CMS routines so any
     26      application which reads PKCS#7 or CMS data from untrusted sources is
     27      affected. SSL/TLS is not affected.
     28 
     29      This issue was reported to OpenSSL by Adam Langley (Google/BoringSSL) using
     30      libFuzzer.
     31      (CVE-2015-3195)
     32      [Stephen Henson]
     33 
     34   *) Rewrite EVP_DecodeUpdate (base64 decoding) to fix several bugs.
     35      This changes the decoding behaviour for some invalid messages,
     36      though the change is mostly in the more lenient direction, and
     37      legacy behaviour is preserved as much as possible.
     38      [Emilia Ksper]
     39 
     40   *) In DSA_generate_parameters_ex, if the provided seed is too short,
     41      return an error
     42      [Rich Salz and Ismo Puustinen <ismo.puustinen (a] intel.com>]
     43 
     44  Changes between 1.0.1o and 1.0.1p [9 Jul 2015]
     45 
     46   *) Alternate chains certificate forgery
     47 
     48      During certificate verfification, OpenSSL will attempt to find an
     49      alternative certificate chain if the first attempt to build such a chain
     50      fails. An error in the implementation of this logic can mean that an
     51      attacker could cause certain checks on untrusted certificates to be
     52      bypassed, such as the CA flag, enabling them to use a valid leaf
     53      certificate to act as a CA and "issue" an invalid certificate.
     54 
     55      This issue was reported to OpenSSL by Adam Langley/David Benjamin
     56      (Google/BoringSSL).
     57      (CVE-2015-1793)
     58      [Matt Caswell]
     59 
     60   *) Race condition handling PSK identify hint
     61 
     62      If PSK identity hints are received by a multi-threaded client then
     63      the values are wrongly updated in the parent SSL_CTX structure. This can
     64      result in a race condition potentially leading to a double free of the
     65      identify hint data.
     66      (CVE-2015-3196)
     67      [Stephen Henson]
     68 
     69  Changes between 1.0.1n and 1.0.1o [12 Jun 2015]
     70   *) Fix HMAC ABI incompatibility. The previous version introduced an ABI
     71      incompatibility in the handling of HMAC. The previous ABI has now been
     72      restored.
     73 
     74  Changes between 1.0.1m and 1.0.1n [11 Jun 2015]
     75 
     76   *) Malformed ECParameters causes infinite loop
     77 
     78      When processing an ECParameters structure OpenSSL enters an infinite loop
     79      if the curve specified is over a specially malformed binary polynomial
     80      field.
     81 
     82      This can be used to perform denial of service against any
     83      system which processes public keys, certificate requests or
     84      certificates.  This includes TLS clients and TLS servers with
     85      client authentication enabled.
     86 
     87      This issue was reported to OpenSSL by Joseph Barr-Pixton.
     88      (CVE-2015-1788)
     89      [Andy Polyakov]
     90 
     91   *) Exploitable out-of-bounds read in X509_cmp_time
     92 
     93      X509_cmp_time does not properly check the length of the ASN1_TIME
     94      string and can read a few bytes out of bounds. In addition,
     95      X509_cmp_time accepts an arbitrary number of fractional seconds in the
     96      time string.
     97 
     98      An attacker can use this to craft malformed certificates and CRLs of
     99      various sizes and potentially cause a segmentation fault, resulting in
    100      a DoS on applications that verify certificates or CRLs. TLS clients
    101      that verify CRLs are affected. TLS clients and servers with client
    102      authentication enabled may be affected if they use custom verification
    103      callbacks.
    104 
    105      This issue was reported to OpenSSL by Robert Swiecki (Google), and
    106      independently by Hanno Bck.
    107      (CVE-2015-1789)
    108      [Emilia Ksper]
    109 
    110   *) PKCS7 crash with missing EnvelopedContent
    111 
    112      The PKCS#7 parsing code does not handle missing inner EncryptedContent
    113      correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs
    114      with missing content and trigger a NULL pointer dereference on parsing.
    115 
    116      Applications that decrypt PKCS#7 data or otherwise parse PKCS#7
    117      structures from untrusted sources are affected. OpenSSL clients and
    118      servers are not affected.
    119 
    120      This issue was reported to OpenSSL by Michal Zalewski (Google).
    121      (CVE-2015-1790)
    122      [Emilia Ksper]
    123 
    124   *) CMS verify infinite loop with unknown hash function
    125 
    126      When verifying a signedData message the CMS code can enter an infinite loop
    127      if presented with an unknown hash function OID. This can be used to perform
    128      denial of service against any system which verifies signedData messages using
    129      the CMS code.
    130      This issue was reported to OpenSSL by Johannes Bauer.
    131      (CVE-2015-1792)
    132      [Stephen Henson]
    133 
    134   *) Race condition handling NewSessionTicket
    135 
    136      If a NewSessionTicket is received by a multi-threaded client when attempting to
    137      reuse a previous ticket then a race condition can occur potentially leading to
    138      a double free of the ticket data.
    139      (CVE-2015-1791)
    140      [Matt Caswell]
    141 
    142   *) Reject DH handshakes with parameters shorter than 768 bits.
    143      [Kurt Roeckx and Emilia Kasper]
    144 
    145   *) dhparam: generate 2048-bit parameters by default.
    146      [Kurt Roeckx and Emilia Kasper]
    147 
    148  Changes between 1.0.1l and 1.0.1m [19 Mar 2015]
    149 
    150   *) Segmentation fault in ASN1_TYPE_cmp fix
    151 
    152      The function ASN1_TYPE_cmp will crash with an invalid read if an attempt is
    153      made to compare ASN.1 boolean types. Since ASN1_TYPE_cmp is used to check
    154      certificate signature algorithm consistency this can be used to crash any
    155      certificate verification operation and exploited in a DoS attack. Any
    156      application which performs certificate verification is vulnerable including
    157      OpenSSL clients and servers which enable client authentication.
    158      (CVE-2015-0286)
    159      [Stephen Henson]
    160 
    161   *) ASN.1 structure reuse memory corruption fix
    162 
    163      Reusing a structure in ASN.1 parsing may allow an attacker to cause
    164      memory corruption via an invalid write. Such reuse is and has been
    165      strongly discouraged and is believed to be rare.
    166 
    167      Applications that parse structures containing CHOICE or ANY DEFINED BY
    168      components may be affected. Certificate parsing (d2i_X509 and related
    169      functions) are however not affected. OpenSSL clients and servers are
    170      not affected.
    171      (CVE-2015-0287)
    172      [Stephen Henson]
    173 
    174   *) PKCS7 NULL pointer dereferences fix
    175 
    176      The PKCS#7 parsing code does not handle missing outer ContentInfo
    177      correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with
    178      missing content and trigger a NULL pointer dereference on parsing.
    179 
    180      Applications that verify PKCS#7 signatures, decrypt PKCS#7 data or
    181      otherwise parse PKCS#7 structures from untrusted sources are
    182      affected. OpenSSL clients and servers are not affected.
    183 
    184      This issue was reported to OpenSSL by Michal Zalewski (Google).
    185      (CVE-2015-0289)
    186      [Emilia Ksper]
    187 
    188   *) DoS via reachable assert in SSLv2 servers fix
    189 
    190      A malicious client can trigger an OPENSSL_assert (i.e., an abort) in
    191      servers that both support SSLv2 and enable export cipher suites by sending
    192      a specially crafted SSLv2 CLIENT-MASTER-KEY message.
    193 
    194      This issue was discovered by Sean Burford (Google) and Emilia Ksper
    195      (OpenSSL development team).
    196      (CVE-2015-0293)
    197      [Emilia Ksper]
    198 
    199   *) Use After Free following d2i_ECPrivatekey error fix
    200 
    201      A malformed EC private key file consumed via the d2i_ECPrivateKey function
    202      could cause a use after free condition. This, in turn, could cause a double
    203      free in several private key parsing functions (such as d2i_PrivateKey
    204      or EVP_PKCS82PKEY) and could lead to a DoS attack or memory corruption
    205      for applications that receive EC private keys from untrusted
    206      sources. This scenario is considered rare.
    207 
    208      This issue was discovered by the BoringSSL project and fixed in their
    209      commit 517073cd4b.
    210      (CVE-2015-0209)
    211      [Matt Caswell]
    212 
    213   *) X509_to_X509_REQ NULL pointer deref fix
    214 
    215      The function X509_to_X509_REQ will crash with a NULL pointer dereference if
    216      the certificate key is invalid. This function is rarely used in practice.
    217 
    218      This issue was discovered by Brian Carpenter.
    219      (CVE-2015-0288)
    220      [Stephen Henson]
    221 
    222   *) Removed the export ciphers from the DEFAULT ciphers
    223      [Kurt Roeckx]
    224 
    225  Changes between 1.0.1k and 1.0.1l [15 Jan 2015]
    226 
    227   *) Build fixes for the Windows and OpenVMS platforms
    228      [Matt Caswell and Richard Levitte]
    229 
    230  Changes between 1.0.1j and 1.0.1k [8 Jan 2015]
    231 
    232   *) Fix DTLS segmentation fault in dtls1_get_record. A carefully crafted DTLS
    233      message can cause a segmentation fault in OpenSSL due to a NULL pointer
    234      dereference. This could lead to a Denial Of Service attack. Thanks to
    235      Markus Stenberg of Cisco Systems, Inc. for reporting this issue.
    236      (CVE-2014-3571)
    237      [Steve Henson]
    238 
    239   *) Fix DTLS memory leak in dtls1_buffer_record. A memory leak can occur in the
    240      dtls1_buffer_record function under certain conditions. In particular this
    241      could occur if an attacker sent repeated DTLS records with the same
    242      sequence number but for the next epoch. The memory leak could be exploited
    243      by an attacker in a Denial of Service attack through memory exhaustion.
    244      Thanks to Chris Mueller for reporting this issue.
    245      (CVE-2015-0206)
    246      [Matt Caswell]
    247 
    248   *) Fix issue where no-ssl3 configuration sets method to NULL. When openssl is
    249      built with the no-ssl3 option and a SSL v3 ClientHello is received the ssl
    250      method would be set to NULL which could later result in a NULL pointer
    251      dereference. Thanks to Frank Schmirler for reporting this issue.
    252      (CVE-2014-3569)
    253      [Kurt Roeckx]
    254 
    255   *) Abort handshake if server key exchange message is omitted for ephemeral
    256      ECDH ciphersuites.
    257 
    258      Thanks to Karthikeyan Bhargavan of the PROSECCO team at INRIA for
    259      reporting this issue.
    260      (CVE-2014-3572)
    261      [Steve Henson]
    262 
    263   *) Remove non-export ephemeral RSA code on client and server. This code
    264      violated the TLS standard by allowing the use of temporary RSA keys in
    265      non-export ciphersuites and could be used by a server to effectively
    266      downgrade the RSA key length used to a value smaller than the server
    267      certificate. Thanks for Karthikeyan Bhargavan of the PROSECCO team at
    268      INRIA or reporting this issue.
    269      (CVE-2015-0204)
    270      [Steve Henson]
    271 
    272   *) Fixed issue where DH client certificates are accepted without verification.
    273      An OpenSSL server will accept a DH certificate for client authentication
    274      without the certificate verify message. This effectively allows a client to
    275      authenticate without the use of a private key. This only affects servers
    276      which trust a client certificate authority which issues certificates
    277      containing DH keys: these are extremely rare and hardly ever encountered.
    278      Thanks for Karthikeyan Bhargavan of the PROSECCO team at INRIA or reporting
    279      this issue.
    280      (CVE-2015-0205)
    281      [Steve Henson]
    282 
    283   *) Ensure that the session ID context of an SSL is updated when its
    284      SSL_CTX is updated via SSL_set_SSL_CTX.
    285 
    286      The session ID context is typically set from the parent SSL_CTX,
    287      and can vary with the CTX.
    288      [Adam Langley]
    289 
    290   *) Fix various certificate fingerprint issues.
    291 
    292      By using non-DER or invalid encodings outside the signed portion of a
    293      certificate the fingerprint can be changed without breaking the signature.
    294      Although no details of the signed portion of the certificate can be changed
    295      this can cause problems with some applications: e.g. those using the
    296      certificate fingerprint for blacklists.
    297 
    298      1. Reject signatures with non zero unused bits.
    299 
    300      If the BIT STRING containing the signature has non zero unused bits reject
    301      the signature. All current signature algorithms require zero unused bits.
    302 
    303      2. Check certificate algorithm consistency.
    304 
    305      Check the AlgorithmIdentifier inside TBS matches the one in the
    306      certificate signature. NB: this will result in signature failure
    307      errors for some broken certificates.
    308 
    309      Thanks to Konrad Kraszewski from Google for reporting this issue.
    310 
    311      3. Check DSA/ECDSA signatures use DER.
    312 
    313      Reencode DSA/ECDSA signatures and compare with the original received
    314      signature. Return an error if there is a mismatch.
    315 
    316      This will reject various cases including garbage after signature
    317      (thanks to Antti Karjalainen and Tuomo Untinen from the Codenomicon CROSS
    318      program for discovering this case) and use of BER or invalid ASN.1 INTEGERs
    319      (negative or with leading zeroes).
    320 
    321      Further analysis was conducted and fixes were developed by Stephen Henson
    322      of the OpenSSL core team.
    323 
    324      (CVE-2014-8275)
    325      [Steve Henson]
    326 
    327    *) Correct Bignum squaring. Bignum squaring (BN_sqr) may produce incorrect
    328       results on some platforms, including x86_64. This bug occurs at random
    329       with a very low probability, and is not known to be exploitable in any
    330       way, though its exact impact is difficult to determine. Thanks to Pieter
    331       Wuille (Blockstream) who reported this issue and also suggested an initial
    332       fix. Further analysis was conducted by the OpenSSL development team and
    333       Adam Langley of Google. The final fix was developed by Andy Polyakov of
    334       the OpenSSL core team.
    335       (CVE-2014-3570)
    336       [Andy Polyakov]
    337 
    338    *) Do not resume sessions on the server if the negotiated protocol
    339       version does not match the session's version. Resuming with a different
    340       version, while not strictly forbidden by the RFC, is of questionable
    341       sanity and breaks all known clients.
    342       [David Benjamin, Emilia Ksper]
    343 
    344    *) Tighten handling of the ChangeCipherSpec (CCS) message: reject
    345       early CCS messages during renegotiation. (Note that because
    346       renegotiation is encrypted, this early CCS was not exploitable.)
    347       [Emilia Ksper]
    348 
    349    *) Tighten client-side session ticket handling during renegotiation:
    350       ensure that the client only accepts a session ticket if the server sends
    351       the extension anew in the ServerHello. Previously, a TLS client would
    352       reuse the old extension state and thus accept a session ticket if one was
    353       announced in the initial ServerHello.
    354 
    355       Similarly, ensure that the client requires a session ticket if one
    356       was advertised in the ServerHello. Previously, a TLS client would
    357       ignore a missing NewSessionTicket message.
    358       [Emilia Ksper]
    359 
    360  Changes between 1.0.1i and 1.0.1j [15 Oct 2014]
    361 
    362   *) SRTP Memory Leak.
    363 
    364      A flaw in the DTLS SRTP extension parsing code allows an attacker, who
    365      sends a carefully crafted handshake message, to cause OpenSSL to fail
    366      to free up to 64k of memory causing a memory leak. This could be
    367      exploited in a Denial Of Service attack. This issue affects OpenSSL
    368      1.0.1 server implementations for both SSL/TLS and DTLS regardless of
    369      whether SRTP is used or configured. Implementations of OpenSSL that
    370      have been compiled with OPENSSL_NO_SRTP defined are not affected.
    371 
    372      The fix was developed by the OpenSSL team.
    373      (CVE-2014-3513)
    374      [OpenSSL team]
    375 
    376   *) Session Ticket Memory Leak.
    377 
    378      When an OpenSSL SSL/TLS/DTLS server receives a session ticket the
    379      integrity of that ticket is first verified. In the event of a session
    380      ticket integrity check failing, OpenSSL will fail to free memory
    381      causing a memory leak. By sending a large number of invalid session
    382      tickets an attacker could exploit this issue in a Denial Of Service
    383      attack.
    384      (CVE-2014-3567)
    385      [Steve Henson]
    386 
    387   *) Build option no-ssl3 is incomplete.
    388 
    389      When OpenSSL is configured with "no-ssl3" as a build option, servers
    390      could accept and complete a SSL 3.0 handshake, and clients could be
    391      configured to send them.
    392      (CVE-2014-3568)
    393      [Akamai and the OpenSSL team]
    394 
    395   *) Add support for TLS_FALLBACK_SCSV.
    396      Client applications doing fallback retries should call
    397      SSL_set_mode(s, SSL_MODE_SEND_FALLBACK_SCSV).
    398      (CVE-2014-3566)
    399      [Adam Langley, Bodo Moeller]
    400 
    401   *) Add additional DigestInfo checks.
    402  
    403      Reencode DigestInto in DER and check against the original when
    404      verifying RSA signature: this will reject any improperly encoded
    405      DigestInfo structures.
    406 
    407      Note: this is a precautionary measure and no attacks are currently known.
    408 
    409      [Steve Henson]
    410 
    411  Changes between 1.0.1h and 1.0.1i [6 Aug 2014]
    412 
    413   *) Fix SRP buffer overrun vulnerability. Invalid parameters passed to the
    414      SRP code can be overrun an internal buffer. Add sanity check that
    415      g, A, B < N to SRP code.
    416 
    417      Thanks to Sean Devlin and Watson Ladd of Cryptography Services, NCC
    418      Group for discovering this issue.
    419      (CVE-2014-3512)
    420      [Steve Henson]
    421 
    422   *) A flaw in the OpenSSL SSL/TLS server code causes the server to negotiate
    423      TLS 1.0 instead of higher protocol versions when the ClientHello message
    424      is badly fragmented. This allows a man-in-the-middle attacker to force a
    425      downgrade to TLS 1.0 even if both the server and the client support a
    426      higher protocol version, by modifying the client's TLS records.
    427 
    428      Thanks to David Benjamin and Adam Langley (Google) for discovering and
    429      researching this issue.
    430      (CVE-2014-3511)
    431      [David Benjamin]
    432 
    433   *) OpenSSL DTLS clients enabling anonymous (EC)DH ciphersuites are subject
    434      to a denial of service attack. A malicious server can crash the client
    435      with a null pointer dereference (read) by specifying an anonymous (EC)DH
    436      ciphersuite and sending carefully crafted handshake messages.
    437 
    438      Thanks to Felix Grbert (Google) for discovering and researching this
    439      issue.
    440      (CVE-2014-3510)
    441      [Emilia Ksper]
    442 
    443   *) By sending carefully crafted DTLS packets an attacker could cause openssl
    444      to leak memory. This can be exploited through a Denial of Service attack.
    445      Thanks to Adam Langley for discovering and researching this issue.
    446      (CVE-2014-3507)
    447      [Adam Langley]
    448 
    449   *) An attacker can force openssl to consume large amounts of memory whilst
    450      processing DTLS handshake messages. This can be exploited through a
    451      Denial of Service attack.
    452      Thanks to Adam Langley for discovering and researching this issue.
    453      (CVE-2014-3506)
    454      [Adam Langley]
    455 
    456   *) An attacker can force an error condition which causes openssl to crash
    457      whilst processing DTLS packets due to memory being freed twice. This
    458      can be exploited through a Denial of Service attack.
    459      Thanks to Adam Langley and Wan-Teh Chang for discovering and researching
    460      this issue.
    461      (CVE-2014-3505)
    462      [Adam Langley]
    463 
    464   *) If a multithreaded client connects to a malicious server using a resumed
    465      session and the server sends an ec point format extension it could write
    466      up to 255 bytes to freed memory.
    467 
    468      Thanks to Gabor Tyukasz (LogMeIn Inc) for discovering and researching this
    469      issue.
    470      (CVE-2014-3509)
    471      [Gabor Tyukasz]
    472 
    473   *) A malicious server can crash an OpenSSL client with a null pointer
    474      dereference (read) by specifying an SRP ciphersuite even though it was not
    475      properly negotiated with the client. This can be exploited through a
    476      Denial of Service attack.
    477 
    478      Thanks to Joonas Kuorilehto and Riku Hietamki (Codenomicon) for
    479      discovering and researching this issue.
    480      (CVE-2014-5139)
    481      [Steve Henson]
    482 
    483   *) A flaw in OBJ_obj2txt may cause pretty printing functions such as
    484      X509_name_oneline, X509_name_print_ex et al. to leak some information
    485      from the stack. Applications may be affected if they echo pretty printing
    486      output to the attacker.
    487 
    488      Thanks to Ivan Fratric (Google) for discovering this issue.
    489      (CVE-2014-3508)
    490      [Emilia Ksper, and Steve Henson]
    491 
    492   *) Fix ec_GFp_simple_points_make_affine (thus, EC_POINTs_mul etc.)
    493      for corner cases. (Certain input points at infinity could lead to
    494      bogus results, with non-infinity inputs mapped to infinity too.)
    495      [Bodo Moeller]
    496 
    497  Changes between 1.0.1g and 1.0.1h [5 Jun 2014]
    498 
    499   *) Fix for SSL/TLS MITM flaw. An attacker using a carefully crafted
    500      handshake can force the use of weak keying material in OpenSSL
    501      SSL/TLS clients and servers.
    502 
    503      Thanks to KIKUCHI Masashi (Lepidum Co. Ltd.) for discovering and
    504      researching this issue. (CVE-2014-0224)
    505      [KIKUCHI Masashi, Steve Henson]
    506 
    507   *) Fix DTLS recursion flaw. By sending an invalid DTLS handshake to an
    508      OpenSSL DTLS client the code can be made to recurse eventually crashing
    509      in a DoS attack.
    510 
    511      Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.
    512      (CVE-2014-0221)
    513      [Imre Rad, Steve Henson]
    514 
    515   *) Fix DTLS invalid fragment vulnerability. A buffer overrun attack can
    516      be triggered by sending invalid DTLS fragments to an OpenSSL DTLS
    517      client or server. This is potentially exploitable to run arbitrary
    518      code on a vulnerable client or server.
    519 
    520      Thanks to Jri Aedla for reporting this issue. (CVE-2014-0195)
    521      [Jri Aedla, Steve Henson]
    522 
    523   *) Fix bug in TLS code where clients enable anonymous ECDH ciphersuites
    524      are subject to a denial of service attack.
    525 
    526      Thanks to Felix Grbert and Ivan Fratric at Google for discovering
    527      this issue. (CVE-2014-3470)
    528      [Felix Grbert, Ivan Fratric, Steve Henson]
    529 
    530   *) Harmonize version and its documentation. -f flag is used to display
    531      compilation flags.
    532      [mancha <mancha1 (a] zoho.com>]
    533 
    534   *) Fix eckey_priv_encode so it immediately returns an error upon a failure
    535      in i2d_ECPrivateKey.
    536      [mancha <mancha1 (a] zoho.com>]
    537 
    538   *) Fix some double frees. These are not thought to be exploitable.
    539      [mancha <mancha1 (a] zoho.com>]
    540 
    541  Changes between 1.0.1f and 1.0.1g [7 Apr 2014]
    542 
    543   *) A missing bounds check in the handling of the TLS heartbeat extension
    544      can be used to reveal up to 64k of memory to a connected client or
    545      server.
    546 
    547      Thanks for Neel Mehta of Google Security for discovering this bug and to
    548      Adam Langley <agl (a] chromium.org> and Bodo Moeller <bmoeller (a] acm.org> for
    549      preparing the fix (CVE-2014-0160)
    550      [Adam Langley, Bodo Moeller]
    551 
    552   *) Fix for the attack described in the paper "Recovering OpenSSL
    553      ECDSA Nonces Using the FLUSH+RELOAD Cache Side-channel Attack"
    554      by Yuval Yarom and Naomi Benger. Details can be obtained from:
    555      http://eprint.iacr.org/2014/140
    556 
    557      Thanks to Yuval Yarom and Naomi Benger for discovering this
    558      flaw and to Yuval Yarom for supplying a fix (CVE-2014-0076)
    559      [Yuval Yarom and Naomi Benger]
    560 
    561   *) TLS pad extension: draft-agl-tls-padding-03
    562 
    563      Workaround for the "TLS hang bug" (see FAQ and PR#2771): if the
    564      TLS client Hello record length value would otherwise be > 255 and
    565      less that 512 pad with a dummy extension containing zeroes so it
    566      is at least 512 bytes long.
    567 
    568      [Adam Langley, Steve Henson]
    569 
    570  Changes between 1.0.1e and 1.0.1f [6 Jan 2014]
    571 
    572   *) Fix for TLS record tampering bug. A carefully crafted invalid 
    573      handshake could crash OpenSSL with a NULL pointer exception.
    574      Thanks to Anton Johansson for reporting this issues.
    575      (CVE-2013-4353)
    576 
    577   *) Keep original DTLS digest and encryption contexts in retransmission
    578      structures so we can use the previous session parameters if they need
    579      to be resent. (CVE-2013-6450)
    580      [Steve Henson]
    581 
    582   *) Add option SSL_OP_SAFARI_ECDHE_ECDSA_BUG (part of SSL_OP_ALL) which
    583      avoids preferring ECDHE-ECDSA ciphers when the client appears to be
    584      Safari on OS X.  Safari on OS X 10.8..10.8.3 advertises support for
    585      several ECDHE-ECDSA ciphers, but fails to negotiate them.  The bug
    586      is fixed in OS X 10.8.4, but Apple have ruled out both hot fixing
    587      10.8..10.8.3 and forcing users to upgrade to 10.8.4 or newer.
    588      [Rob Stradling, Adam Langley]
    589 
    590  Changes between 1.0.1d and 1.0.1e [11 Feb 2013]
    591 
    592   *) Correct fix for CVE-2013-0169. The original didn't work on AES-NI
    593      supporting platforms or when small records were transferred.
    594      [Andy Polyakov, Steve Henson]
    595 
    596  Changes between 1.0.1c and 1.0.1d [5 Feb 2013]
    597 
    598   *) Make the decoding of SSLv3, TLS and DTLS CBC records constant time.
    599 
    600      This addresses the flaw in CBC record processing discovered by 
    601      Nadhem Alfardan and Kenny Paterson. Details of this attack can be found
    602      at: http://www.isg.rhul.ac.uk/tls/     
    603 
    604      Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
    605      Security Group at Royal Holloway, University of London
    606      (www.isg.rhul.ac.uk) for discovering this flaw and Adam Langley and
    607      Emilia Ksper for the initial patch.
    608      (CVE-2013-0169)
    609      [Emilia Ksper, Adam Langley, Ben Laurie, Andy Polyakov, Steve Henson]
    610 
    611   *) Fix flaw in AESNI handling of TLS 1.2 and 1.1 records for CBC mode
    612      ciphersuites which can be exploited in a denial of service attack.
    613      Thanks go to and to Adam Langley <agl (a] chromium.org> for discovering
    614      and detecting this bug and to Wolfgang Ettlinger
    615      <wolfgang.ettlinger (a] gmail.com> for independently discovering this issue.
    616      (CVE-2012-2686)
    617      [Adam Langley]
    618 
    619   *) Return an error when checking OCSP signatures when key is NULL.
    620      This fixes a DoS attack. (CVE-2013-0166)
    621      [Steve Henson]
    622 
    623   *) Make openssl verify return errors.
    624      [Chris Palmer <palmer (a] google.com> and Ben Laurie]
    625 
    626   *) Call OCSP Stapling callback after ciphersuite has been chosen, so
    627      the right response is stapled. Also change SSL_get_certificate()
    628      so it returns the certificate actually sent.
    629      See http://rt.openssl.org/Ticket/Display.html?id=2836.
    630      [Rob Stradling <rob.stradling (a] comodo.com>]
    631 
    632   *) Fix possible deadlock when decoding public keys.
    633      [Steve Henson]
    634 
    635   *) Don't use TLS 1.0 record version number in initial client hello
    636      if renegotiating.
    637      [Steve Henson]
    638 
    639  Changes between 1.0.1b and 1.0.1c [10 May 2012]
    640 
    641   *) Sanity check record length before skipping explicit IV in TLS
    642      1.2, 1.1 and DTLS to fix DoS attack.
    643 
    644      Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
    645      fuzzing as a service testing platform.
    646      (CVE-2012-2333)
    647      [Steve Henson]
    648 
    649   *) Initialise tkeylen properly when encrypting CMS messages.
    650      Thanks to Solar Designer of Openwall for reporting this issue.
    651      [Steve Henson]
    652 
    653   *) In FIPS mode don't try to use composite ciphers as they are not
    654      approved.
    655      [Steve Henson]
    656 
    657  Changes between 1.0.1a and 1.0.1b [26 Apr 2012]
    658 
    659   *) OpenSSL 1.0.0 sets SSL_OP_ALL to 0x80000FFFL and OpenSSL 1.0.1 and
    660      1.0.1a set SSL_OP_NO_TLSv1_1 to 0x00000400L which would unfortunately
    661      mean any application compiled against OpenSSL 1.0.0 headers setting
    662      SSL_OP_ALL would also set SSL_OP_NO_TLSv1_1, unintentionally disablng
    663      TLS 1.1 also. Fix this by changing the value of SSL_OP_NO_TLSv1_1 to
    664      0x10000000L Any application which was previously compiled against
    665      OpenSSL 1.0.1 or 1.0.1a headers and which cares about SSL_OP_NO_TLSv1_1
    666      will need to be recompiled as a result. Letting be results in
    667      inability to disable specifically TLS 1.1 and in client context,
    668      in unlike event, limit maximum offered version to TLS 1.0 [see below].
    669      [Steve Henson]
    670 
    671   *) In order to ensure interoperabilty SSL_OP_NO_protocolX does not
    672      disable just protocol X, but all protocols above X *if* there are
    673      protocols *below* X still enabled. In more practical terms it means
    674      that if application wants to disable TLS1.0 in favor of TLS1.1 and
    675      above, it's not sufficient to pass SSL_OP_NO_TLSv1, one has to pass
    676      SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. This applies to
    677      client side.
    678      [Andy Polyakov]
    679 
    680  Changes between 1.0.1 and 1.0.1a [19 Apr 2012]
    681 
    682   *) Check for potentially exploitable overflows in asn1_d2i_read_bio
    683      BUF_mem_grow and BUF_mem_grow_clean. Refuse attempts to shrink buffer
    684      in CRYPTO_realloc_clean.
    685 
    686      Thanks to Tavis Ormandy, Google Security Team, for discovering this
    687      issue and to Adam Langley <agl (a] chromium.org> for fixing it.
    688      (CVE-2012-2110)
    689      [Adam Langley (Google), Tavis Ormandy, Google Security Team]
    690 
    691   *) Don't allow TLS 1.2 SHA-256 ciphersuites in TLS 1.0, 1.1 connections.
    692      [Adam Langley]
    693 
    694   *) Workarounds for some broken servers that "hang" if a client hello
    695      record length exceeds 255 bytes.
    696 
    697      1. Do not use record version number > TLS 1.0 in initial client
    698         hello: some (but not all) hanging servers will now work.
    699      2. If we set OPENSSL_MAX_TLS1_2_CIPHER_LENGTH this will truncate
    700 	the number of ciphers sent in the client hello. This should be
    701         set to an even number, such as 50, for example by passing:
    702         -DOPENSSL_MAX_TLS1_2_CIPHER_LENGTH=50 to config or Configure.
    703         Most broken servers should now work.
    704      3. If all else fails setting OPENSSL_NO_TLS1_2_CLIENT will disable
    705 	TLS 1.2 client support entirely.
    706      [Steve Henson]
    707 
    708   *) Fix SEGV in Vector Permutation AES module observed in OpenSSH.
    709      [Andy Polyakov]
    710 
    711  Changes between 1.0.0h and 1.0.1  [14 Mar 2012]
    712 
    713   *) Add compatibility with old MDC2 signatures which use an ASN1 OCTET
    714      STRING form instead of a DigestInfo.
    715      [Steve Henson]
    716 
    717   *) The format used for MDC2 RSA signatures is inconsistent between EVP
    718      and the RSA_sign/RSA_verify functions. This was made more apparent when
    719      OpenSSL used RSA_sign/RSA_verify for some RSA signatures in particular
    720      those which went through EVP_PKEY_METHOD in 1.0.0 and later. Detect 
    721      the correct format in RSA_verify so both forms transparently work.
    722      [Steve Henson]
    723 
    724   *) Some servers which support TLS 1.0 can choke if we initially indicate
    725      support for TLS 1.2 and later renegotiate using TLS 1.0 in the RSA
    726      encrypted premaster secret. As a workaround use the maximum pemitted
    727      client version in client hello, this should keep such servers happy
    728      and still work with previous versions of OpenSSL.
    729      [Steve Henson]
    730 
    731   *) Add support for TLS/DTLS heartbeats.
    732      [Robin Seggelmann <seggelmann (a] fh-muenster.de>]
    733 
    734   *) Add support for SCTP.
    735      [Robin Seggelmann <seggelmann (a] fh-muenster.de>]
    736 
    737   *) Improved PRNG seeding for VOS.
    738      [Paul Green <Paul.Green (a] stratus.com>]
    739 
    740   *) Extensive assembler packs updates, most notably:
    741 
    742 	- x86[_64]:     AES-NI, PCLMULQDQ, RDRAND support;
    743 	- x86[_64]:     SSSE3 support (SHA1, vector-permutation AES);
    744 	- x86_64:       bit-sliced AES implementation;
    745 	- ARM:          NEON support, contemporary platforms optimizations;
    746 	- s390x:        z196 support;
    747 	- *:            GHASH and GF(2^m) multiplication implementations;
    748 
    749      [Andy Polyakov]
    750 
    751   *) Make TLS-SRP code conformant with RFC 5054 API cleanup
    752      (removal of unnecessary code)
    753      [Peter Sylvester <peter.sylvester (a] edelweb.fr>]
    754 
    755   *) Add TLS key material exporter from RFC 5705.
    756      [Eric Rescorla]
    757 
    758   *) Add DTLS-SRTP negotiation from RFC 5764.
    759      [Eric Rescorla]
    760 
    761   *) Add Next Protocol Negotiation,
    762      http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-00. Can be
    763      disabled with a no-npn flag to config or Configure. Code donated
    764      by Google.
    765      [Adam Langley <agl (a] google.com> and Ben Laurie]
    766 
    767   *) Add optional 64-bit optimized implementations of elliptic curves NIST-P224,
    768      NIST-P256, NIST-P521, with constant-time single point multiplication on
    769      typical inputs. Compiler support for the nonstandard type __uint128_t is
    770      required to use this (present in gcc 4.4 and later, for 64-bit builds).
    771      Code made available under Apache License version 2.0.
    772 
    773      Specify "enable-ec_nistp_64_gcc_128" on the Configure (or config) command
    774      line to include this in your build of OpenSSL, and run "make depend" (or
    775      "make update"). This enables the following EC_METHODs:
    776 
    777          EC_GFp_nistp224_method()
    778          EC_GFp_nistp256_method()
    779          EC_GFp_nistp521_method()
    780 
    781      EC_GROUP_new_by_curve_name() will automatically use these (while
    782      EC_GROUP_new_curve_GFp() currently prefers the more flexible
    783      implementations).
    784      [Emilia Ksper, Adam Langley, Bodo Moeller (Google)]
    785 
    786   *) Use type ossl_ssize_t instad of ssize_t which isn't available on
    787      all platforms. Move ssize_t definition from e_os.h to the public
    788      header file e_os2.h as it now appears in public header file cms.h
    789      [Steve Henson]
    790 
    791   *) New -sigopt option to the ca, req and x509 utilities. Additional
    792      signature parameters can be passed using this option and in
    793      particular PSS. 
    794      [Steve Henson]
    795 
    796   *) Add RSA PSS signing function. This will generate and set the
    797      appropriate AlgorithmIdentifiers for PSS based on those in the
    798      corresponding EVP_MD_CTX structure. No application support yet.
    799      [Steve Henson]
    800 
    801   *) Support for companion algorithm specific ASN1 signing routines.
    802      New function ASN1_item_sign_ctx() signs a pre-initialised
    803      EVP_MD_CTX structure and sets AlgorithmIdentifiers based on
    804      the appropriate parameters.
    805      [Steve Henson]
    806 
    807   *) Add new algorithm specific ASN1 verification initialisation function
    808      to EVP_PKEY_ASN1_METHOD: this is not in EVP_PKEY_METHOD since the ASN1
    809      handling will be the same no matter what EVP_PKEY_METHOD is used.
    810      Add a PSS handler to support verification of PSS signatures: checked
    811      against a number of sample certificates.
    812      [Steve Henson]
    813 
    814   *) Add signature printing for PSS. Add PSS OIDs.
    815      [Steve Henson, Martin Kaiser <lists (a] kaiser.cx>]
    816 
    817   *) Add algorithm specific signature printing. An individual ASN1 method
    818      can now print out signatures instead of the standard hex dump. 
    819 
    820      More complex signatures (e.g. PSS) can print out more meaningful
    821      information. Include DSA version that prints out the signature
    822      parameters r, s.
    823      [Steve Henson]
    824 
    825   *) Password based recipient info support for CMS library: implementing
    826      RFC3211.
    827      [Steve Henson]
    828 
    829   *) Split password based encryption into PBES2 and PBKDF2 functions. This
    830      neatly separates the code into cipher and PBE sections and is required
    831      for some algorithms that split PBES2 into separate pieces (such as
    832      password based CMS).
    833      [Steve Henson]
    834 
    835   *) Session-handling fixes:
    836      - Fix handling of connections that are resuming with a session ID,
    837        but also support Session Tickets.
    838      - Fix a bug that suppressed issuing of a new ticket if the client
    839        presented a ticket with an expired session.
    840      - Try to set the ticket lifetime hint to something reasonable.
    841      - Make tickets shorter by excluding irrelevant information.
    842      - On the client side, don't ignore renewed tickets.
    843      [Adam Langley, Bodo Moeller (Google)]
    844 
    845   *) Fix PSK session representation.
    846      [Bodo Moeller]
    847 
    848   *) Add RC4-MD5 and AESNI-SHA1 "stitched" implementations.
    849 
    850      This work was sponsored by Intel.
    851      [Andy Polyakov]
    852 
    853   *) Add GCM support to TLS library. Some custom code is needed to split
    854      the IV between the fixed (from PRF) and explicit (from TLS record)
    855      portions. This adds all GCM ciphersuites supported by RFC5288 and 
    856      RFC5289. Generalise some AES* cipherstrings to inlclude GCM and
    857      add a special AESGCM string for GCM only.
    858      [Steve Henson]
    859 
    860   *) Expand range of ctrls for AES GCM. Permit setting invocation
    861      field on decrypt and retrieval of invocation field only on encrypt.
    862      [Steve Henson]
    863 
    864   *) Add HMAC ECC ciphersuites from RFC5289. Include SHA384 PRF support.
    865      As required by RFC5289 these ciphersuites cannot be used if for
    866      versions of TLS earlier than 1.2.
    867      [Steve Henson]
    868 
    869   *) For FIPS capable OpenSSL interpret a NULL default public key method
    870      as unset and return the appopriate default but do *not* set the default.
    871      This means we can return the appopriate method in applications that
    872      swicth between FIPS and non-FIPS modes.
    873      [Steve Henson]
    874 
    875   *) Redirect HMAC and CMAC operations to FIPS module in FIPS mode. If an
    876      ENGINE is used then we cannot handle that in the FIPS module so we
    877      keep original code iff non-FIPS operations are allowed.
    878      [Steve Henson]
    879 
    880   *) Add -attime option to openssl utilities.
    881      [Peter Eckersley <pde (a] eff.org>, Ben Laurie and Steve Henson]
    882 
    883   *) Redirect DSA and DH operations to FIPS module in FIPS mode.
    884      [Steve Henson]
    885 
    886   *) Redirect ECDSA and ECDH operations to FIPS module in FIPS mode. Also use
    887      FIPS EC methods unconditionally for now.
    888      [Steve Henson]
    889 
    890   *) New build option no-ec2m to disable characteristic 2 code.
    891      [Steve Henson]
    892 
    893   *) Backport libcrypto audit of return value checking from 1.1.0-dev; not
    894      all cases can be covered as some introduce binary incompatibilities.
    895      [Steve Henson]
    896 
    897   *) Redirect RSA operations to FIPS module including keygen,
    898      encrypt, decrypt, sign and verify. Block use of non FIPS RSA methods.
    899      [Steve Henson]
    900 
    901   *) Add similar low level API blocking to ciphers.
    902      [Steve Henson]
    903 
    904   *) Low level digest APIs are not approved in FIPS mode: any attempt
    905      to use these will cause a fatal error. Applications that *really* want
    906      to use them can use the private_* version instead.
    907      [Steve Henson]
    908 
    909   *) Redirect cipher operations to FIPS module for FIPS builds. 
    910      [Steve Henson]
    911 
    912   *) Redirect digest operations to FIPS module for FIPS builds. 
    913      [Steve Henson]
    914 
    915   *) Update build system to add "fips" flag which will link in fipscanister.o
    916      for static and shared library builds embedding a signature if needed.
    917      [Steve Henson]
    918 
    919   *) Output TLS supported curves in preference order instead of numerical
    920      order. This is currently hardcoded for the highest order curves first.
    921      This should be configurable so applications can judge speed vs strength.
    922      [Steve Henson]
    923 
    924   *) Add TLS v1.2 server support for client authentication. 
    925      [Steve Henson]
    926 
    927   *) Add support for FIPS mode in ssl library: disable SSLv3, non-FIPS ciphers
    928      and enable MD5.
    929      [Steve Henson]
    930 
    931   *) Functions FIPS_mode_set() and FIPS_mode() which call the underlying
    932      FIPS modules versions.
    933      [Steve Henson]
    934 
    935   *) Add TLS v1.2 client side support for client authentication. Keep cache
    936      of handshake records longer as we don't know the hash algorithm to use
    937      until after the certificate request message is received.
    938      [Steve Henson]
    939 
    940   *) Initial TLS v1.2 client support. Add a default signature algorithms
    941      extension including all the algorithms we support. Parse new signature
    942      format in client key exchange. Relax some ECC signing restrictions for
    943      TLS v1.2 as indicated in RFC5246.
    944      [Steve Henson]
    945 
    946   *) Add server support for TLS v1.2 signature algorithms extension. Switch
    947      to new signature format when needed using client digest preference.
    948      All server ciphersuites should now work correctly in TLS v1.2. No client
    949      support yet and no support for client certificates.
    950      [Steve Henson]
    951 
    952   *) Initial TLS v1.2 support. Add new SHA256 digest to ssl code, switch
    953      to SHA256 for PRF when using TLS v1.2 and later. Add new SHA256 based
    954      ciphersuites. At present only RSA key exchange ciphersuites work with
    955      TLS v1.2. Add new option for TLS v1.2 replacing the old and obsolete
    956      SSL_OP_PKCS1_CHECK flags with SSL_OP_NO_TLSv1_2. New TLSv1.2 methods
    957      and version checking.
    958      [Steve Henson]
    959 
    960   *) New option OPENSSL_NO_SSL_INTERN. If an application can be compiled
    961      with this defined it will not be affected by any changes to ssl internal
    962      structures. Add several utility functions to allow openssl application
    963      to work with OPENSSL_NO_SSL_INTERN defined.
    964      [Steve Henson]
    965 
    966   *) Add SRP support.
    967      [Tom Wu <tjw (a] cs.stanford.edu> and Ben Laurie]
    968 
    969   *) Add functions to copy EVP_PKEY_METHOD and retrieve flags and id.
    970      [Steve Henson]
    971 
    972   *) Permit abbreviated handshakes when renegotiating using the function
    973      SSL_renegotiate_abbreviated().
    974      [Robin Seggelmann <seggelmann (a] fh-muenster.de>]
    975 
    976   *) Add call to ENGINE_register_all_complete() to
    977      ENGINE_load_builtin_engines(), so some implementations get used
    978      automatically instead of needing explicit application support.
    979      [Steve Henson]
    980 
    981   *) Add support for TLS key exporter as described in RFC5705.
    982      [Robin Seggelmann <seggelmann (a] fh-muenster.de>, Steve Henson]
    983 
    984   *) Initial TLSv1.1 support. Since TLSv1.1 is very similar to TLS v1.0 only
    985      a few changes are required:
    986 
    987        Add SSL_OP_NO_TLSv1_1 flag.
    988        Add TLSv1_1 methods.
    989        Update version checking logic to handle version 1.1.
    990        Add explicit IV handling (ported from DTLS code).
    991        Add command line options to s_client/s_server.
    992      [Steve Henson]
    993 
    994  Changes between 1.0.0g and 1.0.0h [12 Mar 2012]
    995 
    996   *) Fix MMA (Bleichenbacher's attack on PKCS #1 v1.5 RSA padding) weakness
    997      in CMS and PKCS7 code. When RSA decryption fails use a random key for
    998      content decryption and always return the same error. Note: this attack
    999      needs on average 2^20 messages so it only affects automated senders. The
   1000      old behaviour can be reenabled in the CMS code by setting the
   1001      CMS_DEBUG_DECRYPT flag: this is useful for debugging and testing where
   1002      an MMA defence is not necessary.
   1003      Thanks to Ivan Nestlerode <inestlerode (a] us.ibm.com> for discovering
   1004      this issue. (CVE-2012-0884)
   1005      [Steve Henson]
   1006 
   1007   *) Fix CVE-2011-4619: make sure we really are receiving a 
   1008      client hello before rejecting multiple SGC restarts. Thanks to
   1009      Ivan Nestlerode <inestlerode (a] us.ibm.com> for discovering this bug.
   1010      [Steve Henson]
   1011 
   1012  Changes between 1.0.0f and 1.0.0g [18 Jan 2012]
   1013 
   1014   *) Fix for DTLS DoS issue introduced by fix for CVE-2011-4109.
   1015      Thanks to Antonio Martin, Enterprise Secure Access Research and
   1016      Development, Cisco Systems, Inc. for discovering this bug and
   1017      preparing a fix. (CVE-2012-0050)
   1018      [Antonio Martin]
   1019 
   1020  Changes between 1.0.0e and 1.0.0f [4 Jan 2012]
   1021 
   1022   *) Nadhem Alfardan and Kenny Paterson have discovered an extension
   1023      of the Vaudenay padding oracle attack on CBC mode encryption
   1024      which enables an efficient plaintext recovery attack against
   1025      the OpenSSL implementation of DTLS. Their attack exploits timing
   1026      differences arising during decryption processing. A research
   1027      paper describing this attack can be found at:
   1028                   http://www.isg.rhul.ac.uk/~kp/dtls.pdf
   1029      Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
   1030      Security Group at Royal Holloway, University of London
   1031      (www.isg.rhul.ac.uk) for discovering this flaw and to Robin Seggelmann
   1032      <seggelmann (a] fh-muenster.de> and Michael Tuexen <tuexen (a] fh-muenster.de>
   1033      for preparing the fix. (CVE-2011-4108)
   1034      [Robin Seggelmann, Michael Tuexen]
   1035 
   1036   *) Clear bytes used for block padding of SSL 3.0 records.
   1037      (CVE-2011-4576)
   1038      [Adam Langley (Google)]
   1039 
   1040   *) Only allow one SGC handshake restart for SSL/TLS. Thanks to George
   1041      Kadianakis <desnacked (a] gmail.com> for discovering this issue and
   1042      Adam Langley for preparing the fix. (CVE-2011-4619)
   1043      [Adam Langley (Google)]
   1044 
   1045   *) Check parameters are not NULL in GOST ENGINE. (CVE-2012-0027)
   1046      [Andrey Kulikov <amdeich (a] gmail.com>]
   1047 
   1048   *) Prevent malformed RFC3779 data triggering an assertion failure.
   1049      Thanks to Andrew Chi, BBN Technologies, for discovering the flaw
   1050      and Rob Austein <sra (a] hactrn.net> for fixing it. (CVE-2011-4577)
   1051      [Rob Austein <sra (a] hactrn.net>]
   1052 
   1053   *) Improved PRNG seeding for VOS.
   1054      [Paul Green <Paul.Green (a] stratus.com>]
   1055 
   1056   *) Fix ssl_ciph.c set-up race.
   1057      [Adam Langley (Google)]
   1058 
   1059   *) Fix spurious failures in ecdsatest.c.
   1060      [Emilia Ksper (Google)]
   1061 
   1062   *) Fix the BIO_f_buffer() implementation (which was mixing different
   1063      interpretations of the '..._len' fields).
   1064      [Adam Langley (Google)]
   1065 
   1066   *) Fix handling of BN_BLINDING: now BN_BLINDING_invert_ex (rather than
   1067      BN_BLINDING_invert_ex) calls BN_BLINDING_update, ensuring that concurrent
   1068      threads won't reuse the same blinding coefficients.
   1069 
   1070      This also avoids the need to obtain the CRYPTO_LOCK_RSA_BLINDING
   1071      lock to call BN_BLINDING_invert_ex, and avoids one use of
   1072      BN_BLINDING_update for each BN_BLINDING structure (previously,
   1073      the last update always remained unused).
   1074      [Emilia Ksper (Google)]
   1075 
   1076   *) In ssl3_clear, preserve s3->init_extra along with s3->rbuf.
   1077      [Bob Buckholz (Google)]
   1078 
   1079  Changes between 1.0.0d and 1.0.0e [6 Sep 2011]
   1080 
   1081   *) Fix bug where CRLs with nextUpdate in the past are sometimes accepted
   1082      by initialising X509_STORE_CTX properly. (CVE-2011-3207)
   1083      [Kaspar Brand <ossl (a] velox.ch>]
   1084 
   1085   *) Fix SSL memory handling for (EC)DH ciphersuites, in particular
   1086      for multi-threaded use of ECDH. (CVE-2011-3210)
   1087      [Adam Langley (Google)]
   1088 
   1089   *) Fix x509_name_ex_d2i memory leak on bad inputs.
   1090      [Bodo Moeller]
   1091 
   1092   *) Remove hard coded ecdsaWithSHA1 signature tests in ssl code and check
   1093      signature public key algorithm by using OID xref utilities instead.
   1094      Before this you could only use some ECC ciphersuites with SHA1 only.
   1095      [Steve Henson]
   1096 
   1097   *) Add protection against ECDSA timing attacks as mentioned in the paper
   1098      by Billy Bob Brumley and Nicola Tuveri, see:
   1099 
   1100 	http://eprint.iacr.org/2011/232.pdf
   1101 
   1102      [Billy Bob Brumley and Nicola Tuveri]
   1103 
   1104  Changes between 1.0.0c and 1.0.0d [8 Feb 2011]
   1105 
   1106   *) Fix parsing of OCSP stapling ClientHello extension. CVE-2011-0014
   1107      [Neel Mehta, Adam Langley, Bodo Moeller (Google)]
   1108 
   1109   *) Fix bug in string printing code: if *any* escaping is enabled we must
   1110      escape the escape character (backslash) or the resulting string is
   1111      ambiguous.
   1112      [Steve Henson]
   1113 
   1114  Changes between 1.0.0b and 1.0.0c  [2 Dec 2010]
   1115 
   1116   *) Disable code workaround for ancient and obsolete Netscape browsers
   1117      and servers: an attacker can use it in a ciphersuite downgrade attack.
   1118      Thanks to Martin Rex for discovering this bug. CVE-2010-4180
   1119      [Steve Henson]
   1120 
   1121   *) Fixed J-PAKE implementation error, originally discovered by
   1122      Sebastien Martini, further info and confirmation from Stefan
   1123      Arentz and Feng Hao. Note that this fix is a security fix. CVE-2010-4252
   1124      [Ben Laurie]
   1125 
   1126  Changes between 1.0.0a and 1.0.0b  [16 Nov 2010]
   1127 
   1128   *) Fix extension code to avoid race conditions which can result in a buffer
   1129      overrun vulnerability: resumed sessions must not be modified as they can
   1130      be shared by multiple threads. CVE-2010-3864
   1131      [Steve Henson]
   1132 
   1133   *) Fix WIN32 build system to correctly link an ENGINE directory into
   1134      a DLL. 
   1135      [Steve Henson]
   1136 
   1137  Changes between 1.0.0 and 1.0.0a  [01 Jun 2010]
   1138 
   1139   *) Check return value of int_rsa_verify in pkey_rsa_verifyrecover 
   1140      (CVE-2010-1633)
   1141      [Steve Henson, Peter-Michael Hager <hager (a] dortmund.net>]
   1142 
   1143  Changes between 0.9.8n and 1.0.0  [29 Mar 2010]
   1144 
   1145   *) Add "missing" function EVP_CIPHER_CTX_copy(). This copies a cipher
   1146      context. The operation can be customised via the ctrl mechanism in
   1147      case ENGINEs want to include additional functionality.
   1148      [Steve Henson]
   1149 
   1150   *) Tolerate yet another broken PKCS#8 key format: private key value negative.
   1151      [Steve Henson]
   1152 
   1153   *) Add new -subject_hash_old and -issuer_hash_old options to x509 utility to
   1154      output hashes compatible with older versions of OpenSSL.
   1155      [Willy Weisz <weisz (a] vcpc.univie.ac.at>]
   1156 
   1157   *) Fix compression algorithm handling: if resuming a session use the
   1158      compression algorithm of the resumed session instead of determining
   1159      it from client hello again. Don't allow server to change algorithm.
   1160      [Steve Henson]
   1161 
   1162   *) Add load_crls() function to apps tidying load_certs() too. Add option
   1163      to verify utility to allow additional CRLs to be included.
   1164      [Steve Henson]
   1165 
   1166   *) Update OCSP request code to permit adding custom headers to the request:
   1167      some responders need this.
   1168      [Steve Henson]
   1169 
   1170   *) The function EVP_PKEY_sign() returns <=0 on error: check return code
   1171      correctly.
   1172      [Julia Lawall <julia (a] diku.dk>]
   1173 
   1174   *) Update verify callback code in apps/s_cb.c and apps/verify.c, it
   1175      needlessly dereferenced structures, used obsolete functions and
   1176      didn't handle all updated verify codes correctly.
   1177      [Steve Henson]
   1178 
   1179   *) Disable MD2 in the default configuration.
   1180      [Steve Henson]
   1181 
   1182   *) In BIO_pop() and BIO_push() use the ctrl argument (which was NULL) to
   1183      indicate the initial BIO being pushed or popped. This makes it possible
   1184      to determine whether the BIO is the one explicitly called or as a result
   1185      of the ctrl being passed down the chain. Fix BIO_pop() and SSL BIOs so
   1186      it handles reference counts correctly and doesn't zero out the I/O bio
   1187      when it is not being explicitly popped. WARNING: applications which
   1188      included workarounds for the old buggy behaviour will need to be modified
   1189      or they could free up already freed BIOs.
   1190      [Steve Henson]
   1191 
   1192   *) Extend the uni2asc/asc2uni => OPENSSL_uni2asc/OPENSSL_asc2uni
   1193      renaming to all platforms (within the 0.9.8 branch, this was
   1194      done conditionally on Netware platforms to avoid a name clash).
   1195      [Guenter <lists (a] gknw.net>]
   1196 
   1197   *) Add ECDHE and PSK support to DTLS.
   1198      [Michael Tuexen <tuexen (a] fh-muenster.de>]
   1199 
   1200   *) Add CHECKED_STACK_OF macro to safestack.h, otherwise safestack can't
   1201      be used on C++.
   1202      [Steve Henson]
   1203 
   1204   *) Add "missing" function EVP_MD_flags() (without this the only way to
   1205      retrieve a digest flags is by accessing the structure directly. Update
   1206      EVP_MD_do_all*() and EVP_CIPHER_do_all*() to include the name a digest
   1207      or cipher is registered as in the "from" argument. Print out all
   1208      registered digests in the dgst usage message instead of manually 
   1209      attempting to work them out.
   1210      [Steve Henson]
   1211 
   1212   *) If no SSLv2 ciphers are used don't use an SSLv2 compatible client hello:
   1213      this allows the use of compression and extensions. Change default cipher
   1214      string to remove SSLv2 ciphersuites. This effectively avoids ancient SSLv2
   1215      by default unless an application cipher string requests it.
   1216      [Steve Henson]
   1217 
   1218   *) Alter match criteria in PKCS12_parse(). It used to try to use local
   1219      key ids to find matching certificates and keys but some PKCS#12 files
   1220      don't follow the (somewhat unwritten) rules and this strategy fails.
   1221      Now just gather all certificates together and the first private key
   1222      then look for the first certificate that matches the key.
   1223      [Steve Henson]
   1224 
   1225   *) Support use of registered digest and cipher names for dgst and cipher
   1226      commands instead of having to add each one as a special case. So now
   1227      you can do:
   1228 
   1229         openssl sha256 foo
   1230 
   1231      as well as:
   1232 
   1233         openssl dgst -sha256 foo
   1234 
   1235      and this works for ENGINE based algorithms too.
   1236 
   1237      [Steve Henson]
   1238 
   1239   *) Update Gost ENGINE to support parameter files.
   1240      [Victor B. Wagner <vitus (a] cryptocom.ru>]
   1241 
   1242   *) Support GeneralizedTime in ca utility. 
   1243      [Oliver Martin <oliver (a] volatilevoid.net>, Steve Henson]
   1244 
   1245   *) Enhance the hash format used for certificate directory links. The new
   1246      form uses the canonical encoding (meaning equivalent names will work
   1247      even if they aren't identical) and uses SHA1 instead of MD5. This form
   1248      is incompatible with the older format and as a result c_rehash should
   1249      be used to rebuild symbolic links.
   1250      [Steve Henson]
   1251 
   1252   *) Make PKCS#8 the default write format for private keys, replacing the
   1253      traditional format. This form is standardised, more secure and doesn't
   1254      include an implicit MD5 dependency.
   1255      [Steve Henson]
   1256 
   1257   *) Add a $gcc_devteam_warn option to Configure. The idea is that any code
   1258      committed to OpenSSL should pass this lot as a minimum.
   1259      [Steve Henson]
   1260 
   1261   *) Add session ticket override functionality for use by EAP-FAST.
   1262      [Jouni Malinen <j (a] w1.fi>]
   1263 
   1264   *) Modify HMAC functions to return a value. Since these can be implemented
   1265      in an ENGINE errors can occur.
   1266      [Steve Henson]
   1267 
   1268   *) Type-checked OBJ_bsearch_ex.
   1269      [Ben Laurie]
   1270 
   1271   *) Type-checked OBJ_bsearch. Also some constification necessitated
   1272      by type-checking.  Still to come: TXT_DB, bsearch(?),
   1273      OBJ_bsearch_ex, qsort, CRYPTO_EX_DATA, ASN1_VALUE, ASN1_STRING,
   1274      CONF_VALUE.
   1275      [Ben Laurie]
   1276 
   1277   *) New function OPENSSL_gmtime_adj() to add a specific number of days and
   1278      seconds to a tm structure directly, instead of going through OS
   1279      specific date routines. This avoids any issues with OS routines such
   1280      as the year 2038 bug. New *_adj() functions for ASN1 time structures
   1281      and X509_time_adj_ex() to cover the extended range. The existing
   1282      X509_time_adj() is still usable and will no longer have any date issues.
   1283      [Steve Henson]
   1284 
   1285   *) Delta CRL support. New use deltas option which will attempt to locate
   1286      and search any appropriate delta CRLs available.
   1287 
   1288      This work was sponsored by Google.
   1289      [Steve Henson]
   1290 
   1291   *) Support for CRLs partitioned by reason code. Reorganise CRL processing
   1292      code and add additional score elements. Validate alternate CRL paths
   1293      as part of the CRL checking and indicate a new error "CRL path validation
   1294      error" in this case. Applications wanting additional details can use
   1295      the verify callback and check the new "parent" field. If this is not
   1296      NULL CRL path validation is taking place. Existing applications wont
   1297      see this because it requires extended CRL support which is off by
   1298      default.
   1299 
   1300      This work was sponsored by Google.
   1301      [Steve Henson]
   1302 
   1303   *) Support for freshest CRL extension.
   1304 
   1305      This work was sponsored by Google.
   1306      [Steve Henson]
   1307 
   1308   *) Initial indirect CRL support. Currently only supported in the CRLs
   1309      passed directly and not via lookup. Process certificate issuer
   1310      CRL entry extension and lookup CRL entries by bother issuer name
   1311      and serial number. Check and process CRL issuer entry in IDP extension.
   1312 
   1313      This work was sponsored by Google.
   1314      [Steve Henson]
   1315 
   1316   *) Add support for distinct certificate and CRL paths. The CRL issuer
   1317      certificate is validated separately in this case. Only enabled if
   1318      an extended CRL support flag is set: this flag will enable additional
   1319      CRL functionality in future.
   1320 
   1321      This work was sponsored by Google.
   1322      [Steve Henson]
   1323 
   1324   *) Add support for policy mappings extension.
   1325 
   1326      This work was sponsored by Google.
   1327      [Steve Henson]
   1328 
   1329   *) Fixes to pathlength constraint, self issued certificate handling,
   1330      policy processing to align with RFC3280 and PKITS tests.
   1331 
   1332      This work was sponsored by Google.
   1333      [Steve Henson]
   1334 
   1335   *) Support for name constraints certificate extension. DN, email, DNS
   1336      and URI types are currently supported.
   1337 
   1338      This work was sponsored by Google.
   1339      [Steve Henson]
   1340 
   1341   *) To cater for systems that provide a pointer-based thread ID rather
   1342      than numeric, deprecate the current numeric thread ID mechanism and
   1343      replace it with a structure and associated callback type. This
   1344      mechanism allows a numeric "hash" to be extracted from a thread ID in
   1345      either case, and on platforms where pointers are larger than 'long',
   1346      mixing is done to help ensure the numeric 'hash' is usable even if it
   1347      can't be guaranteed unique. The default mechanism is to use "&errno"
   1348      as a pointer-based thread ID to distinguish between threads.
   1349 
   1350      Applications that want to provide their own thread IDs should now use
   1351      CRYPTO_THREADID_set_callback() to register a callback that will call
   1352      either CRYPTO_THREADID_set_numeric() or CRYPTO_THREADID_set_pointer().
   1353 
   1354      Note that ERR_remove_state() is now deprecated, because it is tied
   1355      to the assumption that thread IDs are numeric.  ERR_remove_state(0)
   1356      to free the current thread's error state should be replaced by
   1357      ERR_remove_thread_state(NULL).
   1358 
   1359      (This new approach replaces the functions CRYPTO_set_idptr_callback(),
   1360      CRYPTO_get_idptr_callback(), and CRYPTO_thread_idptr() that existed in
   1361      OpenSSL 0.9.9-dev between June 2006 and August 2008. Also, if an
   1362      application was previously providing a numeric thread callback that
   1363      was inappropriate for distinguishing threads, then uniqueness might
   1364      have been obtained with &errno that happened immediately in the
   1365      intermediate development versions of OpenSSL; this is no longer the
   1366      case, the numeric thread callback will now override the automatic use
   1367      of &errno.)
   1368      [Geoff Thorpe, with help from Bodo Moeller]
   1369 
   1370   *) Initial support for different CRL issuing certificates. This covers a
   1371      simple case where the self issued certificates in the chain exist and
   1372      the real CRL issuer is higher in the existing chain.
   1373 
   1374      This work was sponsored by Google.
   1375      [Steve Henson]
   1376 
   1377   *) Removed effectively defunct crypto/store from the build.
   1378      [Ben Laurie]
   1379 
   1380   *) Revamp of STACK to provide stronger type-checking. Still to come:
   1381      TXT_DB, bsearch(?), OBJ_bsearch, qsort, CRYPTO_EX_DATA, ASN1_VALUE,
   1382      ASN1_STRING, CONF_VALUE.
   1383      [Ben Laurie]
   1384 
   1385   *) Add a new SSL_MODE_RELEASE_BUFFERS mode flag to release unused buffer
   1386      RAM on SSL connections.  This option can save about 34k per idle SSL.
   1387      [Nick Mathewson]
   1388 
   1389   *) Revamp of LHASH to provide stronger type-checking. Still to come:
   1390      STACK, TXT_DB, bsearch, qsort.
   1391      [Ben Laurie]
   1392 
   1393   *) Initial support for Cryptographic Message Syntax (aka CMS) based
   1394      on RFC3850, RFC3851 and RFC3852. New cms directory and cms utility,
   1395      support for data, signedData, compressedData, digestedData and
   1396      encryptedData, envelopedData types included. Scripts to check against
   1397      RFC4134 examples draft and interop and consistency checks of many
   1398      content types and variants.
   1399      [Steve Henson]
   1400 
   1401   *) Add options to enc utility to support use of zlib compression BIO.
   1402      [Steve Henson]
   1403 
   1404   *) Extend mk1mf to support importing of options and assembly language
   1405      files from Configure script, currently only included in VC-WIN32.
   1406      The assembly language rules can now optionally generate the source
   1407      files from the associated perl scripts.
   1408      [Steve Henson]
   1409 
   1410   *) Implement remaining functionality needed to support GOST ciphersuites.
   1411      Interop testing has been performed using CryptoPro implementations.
   1412      [Victor B. Wagner <vitus (a] cryptocom.ru>]
   1413 
   1414   *) s390x assembler pack.
   1415      [Andy Polyakov]
   1416 
   1417   *) ARMv4 assembler pack. ARMv4 refers to v4 and later ISA, not CPU
   1418      "family."
   1419      [Andy Polyakov]
   1420 
   1421   *) Implement Opaque PRF Input TLS extension as specified in
   1422      draft-rescorla-tls-opaque-prf-input-00.txt.  Since this is not an
   1423      official specification yet and no extension type assignment by
   1424      IANA exists, this extension (for now) will have to be explicitly
   1425      enabled when building OpenSSL by providing the extension number
   1426      to use.  For example, specify an option
   1427 
   1428          -DTLSEXT_TYPE_opaque_prf_input=0x9527
   1429 
   1430      to the "config" or "Configure" script to enable the extension,
   1431      assuming extension number 0x9527 (which is a completely arbitrary
   1432      and unofficial assignment based on the MD5 hash of the Internet
   1433      Draft).  Note that by doing so, you potentially lose
   1434      interoperability with other TLS implementations since these might
   1435      be using the same extension number for other purposes.
   1436 
   1437      SSL_set_tlsext_opaque_prf_input(ssl, src, len) is used to set the
   1438      opaque PRF input value to use in the handshake.  This will create
   1439      an interal copy of the length-'len' string at 'src', and will
   1440      return non-zero for success.
   1441 
   1442      To get more control and flexibility, provide a callback function
   1443      by using
   1444 
   1445           SSL_CTX_set_tlsext_opaque_prf_input_callback(ctx, cb)
   1446           SSL_CTX_set_tlsext_opaque_prf_input_callback_arg(ctx, arg)
   1447 
   1448      where
   1449 
   1450           int (*cb)(SSL *, void *peerinput, size_t len, void *arg);
   1451           void *arg;
   1452 
   1453      Callback function 'cb' will be called in handshakes, and is
   1454      expected to use SSL_set_tlsext_opaque_prf_input() as appropriate.
   1455      Argument 'arg' is for application purposes (the value as given to
   1456      SSL_CTX_set_tlsext_opaque_prf_input_callback_arg() will directly
   1457      be provided to the callback function).  The callback function
   1458      has to return non-zero to report success: usually 1 to use opaque
   1459      PRF input just if possible, or 2 to enforce use of the opaque PRF
   1460      input.  In the latter case, the library will abort the handshake
   1461      if opaque PRF input is not successfully negotiated.
   1462 
   1463      Arguments 'peerinput' and 'len' given to the callback function
   1464      will always be NULL and 0 in the case of a client.  A server will
   1465      see the client's opaque PRF input through these variables if
   1466      available (NULL and 0 otherwise).  Note that if the server
   1467      provides an opaque PRF input, the length must be the same as the
   1468      length of the client's opaque PRF input.
   1469 
   1470      Note that the callback function will only be called when creating
   1471      a new session (session resumption can resume whatever was
   1472      previously negotiated), and will not be called in SSL 2.0
   1473      handshakes; thus, SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) or
   1474      SSL_set_options(ssl, SSL_OP_NO_SSLv2) is especially recommended
   1475      for applications that need to enforce opaque PRF input.
   1476 
   1477      [Bodo Moeller]
   1478 
   1479   *) Update ssl code to support digests other than SHA1+MD5 for handshake
   1480      MAC. 
   1481 
   1482      [Victor B. Wagner <vitus (a] cryptocom.ru>]
   1483 
   1484   *) Add RFC4507 support to OpenSSL. This includes the corrections in
   1485      RFC4507bis. The encrypted ticket format is an encrypted encoded
   1486      SSL_SESSION structure, that way new session features are automatically
   1487      supported.
   1488 
   1489      If a client application caches session in an SSL_SESSION structure
   1490      support is transparent because tickets are now stored in the encoded
   1491      SSL_SESSION.
   1492      
   1493      The SSL_CTX structure automatically generates keys for ticket
   1494      protection in servers so again support should be possible
   1495      with no application modification.
   1496 
   1497      If a client or server wishes to disable RFC4507 support then the option
   1498      SSL_OP_NO_TICKET can be set.
   1499 
   1500      Add a TLS extension debugging callback to allow the contents of any client
   1501      or server extensions to be examined.
   1502 
   1503      This work was sponsored by Google.
   1504      [Steve Henson]
   1505 
   1506   *) Final changes to avoid use of pointer pointer casts in OpenSSL.
   1507      OpenSSL should now compile cleanly on gcc 4.2
   1508      [Peter Hartley <pdh (a] utter.chaos.org.uk>, Steve Henson]
   1509 
   1510   *) Update SSL library to use new EVP_PKEY MAC API. Include generic MAC
   1511      support including streaming MAC support: this is required for GOST
   1512      ciphersuite support.
   1513      [Victor B. Wagner <vitus (a] cryptocom.ru>, Steve Henson]
   1514 
   1515   *) Add option -stream to use PKCS#7 streaming in smime utility. New
   1516      function i2d_PKCS7_bio_stream() and PEM_write_PKCS7_bio_stream()
   1517      to output in BER and PEM format.
   1518      [Steve Henson]
   1519 
   1520   *) Experimental support for use of HMAC via EVP_PKEY interface. This
   1521      allows HMAC to be handled via the EVP_DigestSign*() interface. The
   1522      EVP_PKEY "key" in this case is the HMAC key, potentially allowing
   1523      ENGINE support for HMAC keys which are unextractable. New -mac and
   1524      -macopt options to dgst utility.
   1525      [Steve Henson]
   1526 
   1527   *) New option -sigopt to dgst utility. Update dgst to use
   1528      EVP_Digest{Sign,Verify}*. These two changes make it possible to use
   1529      alternative signing paramaters such as X9.31 or PSS in the dgst 
   1530      utility.
   1531      [Steve Henson]
   1532 
   1533   *) Change ssl_cipher_apply_rule(), the internal function that does
   1534      the work each time a ciphersuite string requests enabling
   1535      ("foo+bar"), moving ("+foo+bar"), disabling ("-foo+bar", or
   1536      removing ("!foo+bar") a class of ciphersuites: Now it maintains
   1537      the order of disabled ciphersuites such that those ciphersuites
   1538      that most recently went from enabled to disabled not only stay
   1539      in order with respect to each other, but also have higher priority
   1540      than other disabled ciphersuites the next time ciphersuites are
   1541      enabled again.
   1542 
   1543      This means that you can now say, e.g., "PSK:-PSK:HIGH" to enable
   1544      the same ciphersuites as with "HIGH" alone, but in a specific
   1545      order where the PSK ciphersuites come first (since they are the
   1546      most recently disabled ciphersuites when "HIGH" is parsed).
   1547 
   1548      Also, change ssl_create_cipher_list() (using this new
   1549      funcionality) such that between otherwise identical
   1550      cihpersuites, ephemeral ECDH is preferred over ephemeral DH in
   1551      the default order.
   1552      [Bodo Moeller]
   1553 
   1554   *) Change ssl_create_cipher_list() so that it automatically
   1555      arranges the ciphersuites in reasonable order before starting
   1556      to process the rule string.  Thus, the definition for "DEFAULT"
   1557      (SSL_DEFAULT_CIPHER_LIST) now is just "ALL:!aNULL:!eNULL", but
   1558      remains equivalent to "AES:ALL:!aNULL:!eNULL:+aECDH:+kRSA:+RC4:@STRENGTH".
   1559      This makes it much easier to arrive at a reasonable default order
   1560      in applications for which anonymous ciphers are OK (meaning
   1561      that you can't actually use DEFAULT).
   1562      [Bodo Moeller; suggested by Victor Duchovni]
   1563 
   1564   *) Split the SSL/TLS algorithm mask (as used for ciphersuite string
   1565      processing) into multiple integers instead of setting
   1566      "SSL_MKEY_MASK" bits, "SSL_AUTH_MASK" bits, "SSL_ENC_MASK",
   1567      "SSL_MAC_MASK", and "SSL_SSL_MASK" bits all in a single integer.
   1568      (These masks as well as the individual bit definitions are hidden
   1569      away into the non-exported interface ssl/ssl_locl.h, so this
   1570      change to the definition of the SSL_CIPHER structure shouldn't
   1571      affect applications.)  This give us more bits for each of these
   1572      categories, so there is no longer a need to coagulate AES128 and
   1573      AES256 into a single algorithm bit, and to coagulate Camellia128
   1574      and Camellia256 into a single algorithm bit, which has led to all
   1575      kinds of kludges.
   1576 
   1577      Thus, among other things, the kludge introduced in 0.9.7m and
   1578      0.9.8e for masking out AES256 independently of AES128 or masking
   1579      out Camellia256 independently of AES256 is not needed here in 0.9.9.
   1580 
   1581      With the change, we also introduce new ciphersuite aliases that
   1582      so far were missing: "AES128", "AES256", "CAMELLIA128", and
   1583      "CAMELLIA256".
   1584      [Bodo Moeller]
   1585 
   1586   *) Add support for dsa-with-SHA224 and dsa-with-SHA256.
   1587      Use the leftmost N bytes of the signature input if the input is
   1588      larger than the prime q (with N being the size in bytes of q).
   1589      [Nils Larsch]
   1590 
   1591   *) Very *very* experimental PKCS#7 streaming encoder support. Nothing uses
   1592      it yet and it is largely untested.
   1593      [Steve Henson]
   1594 
   1595   *) Add support for the ecdsa-with-SHA224/256/384/512 signature types.
   1596      [Nils Larsch]
   1597 
   1598   *) Initial incomplete changes to avoid need for function casts in OpenSSL
   1599      some compilers (gcc 4.2 and later) reject their use. Safestack is
   1600      reimplemented.  Update ASN1 to avoid use of legacy functions. 
   1601      [Steve Henson]
   1602 
   1603   *) Win32/64 targets are linked with Winsock2.
   1604      [Andy Polyakov]
   1605 
   1606   *) Add an X509_CRL_METHOD structure to allow CRL processing to be redirected
   1607      to external functions. This can be used to increase CRL handling 
   1608      efficiency especially when CRLs are very large by (for example) storing
   1609      the CRL revoked certificates in a database.
   1610      [Steve Henson]
   1611 
   1612   *) Overhaul of by_dir code. Add support for dynamic loading of CRLs so
   1613      new CRLs added to a directory can be used. New command line option
   1614      -verify_return_error to s_client and s_server. This causes real errors
   1615      to be returned by the verify callback instead of carrying on no matter
   1616      what. This reflects the way a "real world" verify callback would behave.
   1617      [Steve Henson]
   1618 
   1619   *) GOST engine, supporting several GOST algorithms and public key formats.
   1620      Kindly donated by Cryptocom.
   1621      [Cryptocom]
   1622 
   1623   *) Partial support for Issuing Distribution Point CRL extension. CRLs
   1624      partitioned by DP are handled but no indirect CRL or reason partitioning
   1625      (yet). Complete overhaul of CRL handling: now the most suitable CRL is
   1626      selected via a scoring technique which handles IDP and AKID in CRLs.
   1627      [Steve Henson]
   1628 
   1629   *) New X509_STORE_CTX callbacks lookup_crls() and lookup_certs() which
   1630      will ultimately be used for all verify operations: this will remove the
   1631      X509_STORE dependency on certificate verification and allow alternative
   1632      lookup methods.  X509_STORE based implementations of these two callbacks.
   1633      [Steve Henson]
   1634 
   1635   *) Allow multiple CRLs to exist in an X509_STORE with matching issuer names.
   1636      Modify get_crl() to find a valid (unexpired) CRL if possible.
   1637      [Steve Henson]
   1638 
   1639   *) New function X509_CRL_match() to check if two CRLs are identical. Normally
   1640      this would be called X509_CRL_cmp() but that name is already used by
   1641      a function that just compares CRL issuer names. Cache several CRL 
   1642      extensions in X509_CRL structure and cache CRLDP in X509.
   1643      [Steve Henson]
   1644 
   1645   *) Store a "canonical" representation of X509_NAME structure (ASN1 Name)
   1646      this maps equivalent X509_NAME structures into a consistent structure.
   1647      Name comparison can then be performed rapidly using memcmp().
   1648      [Steve Henson]
   1649 
   1650   *) Non-blocking OCSP request processing. Add -timeout option to ocsp 
   1651      utility.
   1652      [Steve Henson]
   1653 
   1654   *) Allow digests to supply their own micalg string for S/MIME type using
   1655      the ctrl EVP_MD_CTRL_MICALG.
   1656      [Steve Henson]
   1657 
   1658   *) During PKCS7 signing pass the PKCS7 SignerInfo structure to the
   1659      EVP_PKEY_METHOD before and after signing via the EVP_PKEY_CTRL_PKCS7_SIGN
   1660      ctrl. It can then customise the structure before and/or after signing
   1661      if necessary.
   1662      [Steve Henson]
   1663 
   1664   *) New function OBJ_add_sigid() to allow application defined signature OIDs
   1665      to be added to OpenSSLs internal tables. New function OBJ_sigid_free()
   1666      to free up any added signature OIDs.
   1667      [Steve Henson]
   1668 
   1669   *) New functions EVP_CIPHER_do_all(), EVP_CIPHER_do_all_sorted(),
   1670      EVP_MD_do_all() and EVP_MD_do_all_sorted() to enumerate internal
   1671      digest and cipher tables. New options added to openssl utility:
   1672      list-message-digest-algorithms and list-cipher-algorithms.
   1673      [Steve Henson]
   1674 
   1675   *) Change the array representation of binary polynomials: the list
   1676      of degrees of non-zero coefficients is now terminated with -1.
   1677      Previously it was terminated with 0, which was also part of the
   1678      value; thus, the array representation was not applicable to
   1679      polynomials where t^0 has coefficient zero.  This change makes
   1680      the array representation useful in a more general context.
   1681      [Douglas Stebila]
   1682 
   1683   *) Various modifications and fixes to SSL/TLS cipher string
   1684      handling.  For ECC, the code now distinguishes between fixed ECDH
   1685      with RSA certificates on the one hand and with ECDSA certificates
   1686      on the other hand, since these are separate ciphersuites.  The
   1687      unused code for Fortezza ciphersuites has been removed.
   1688 
   1689      For consistency with EDH, ephemeral ECDH is now called "EECDH"
   1690      (not "ECDHE").  For consistency with the code for DH
   1691      certificates, use of ECDH certificates is now considered ECDH
   1692      authentication, not RSA or ECDSA authentication (the latter is
   1693      merely the CA's signing algorithm and not actively used in the
   1694      protocol).
   1695 
   1696      The temporary ciphersuite alias "ECCdraft" is no longer
   1697      available, and ECC ciphersuites are no longer excluded from "ALL"
   1698      and "DEFAULT".  The following aliases now exist for RFC 4492
   1699      ciphersuites, most of these by analogy with the DH case:
   1700 
   1701          kECDHr   - ECDH cert, signed with RSA
   1702          kECDHe   - ECDH cert, signed with ECDSA
   1703          kECDH    - ECDH cert (signed with either RSA or ECDSA)
   1704          kEECDH   - ephemeral ECDH
   1705          ECDH     - ECDH cert or ephemeral ECDH
   1706 
   1707          aECDH    - ECDH cert
   1708          aECDSA   - ECDSA cert
   1709          ECDSA    - ECDSA cert
   1710 
   1711          AECDH    - anonymous ECDH
   1712          EECDH    - non-anonymous ephemeral ECDH (equivalent to "kEECDH:-AECDH")
   1713 
   1714      [Bodo Moeller]
   1715 
   1716   *) Add additional S/MIME capabilities for AES and GOST ciphers if supported.
   1717      Use correct micalg parameters depending on digest(s) in signed message.
   1718      [Steve Henson]
   1719 
   1720   *) Add engine support for EVP_PKEY_ASN1_METHOD. Add functions to process
   1721      an ENGINE asn1 method. Support ENGINE lookups in the ASN1 code.
   1722      [Steve Henson]
   1723 
   1724   *) Initial engine support for EVP_PKEY_METHOD. New functions to permit
   1725      an engine to register a method. Add ENGINE lookups for methods and
   1726      functional reference processing.
   1727      [Steve Henson]
   1728 
   1729   *) New functions EVP_Digest{Sign,Verify)*. These are enchance versions of
   1730      EVP_{Sign,Verify}* which allow an application to customise the signature
   1731      process.
   1732      [Steve Henson]
   1733 
   1734   *) New -resign option to smime utility. This adds one or more signers
   1735      to an existing PKCS#7 signedData structure. Also -md option to use an
   1736      alternative message digest algorithm for signing.
   1737      [Steve Henson]
   1738 
   1739   *) Tidy up PKCS#7 routines and add new functions to make it easier to
   1740      create PKCS7 structures containing multiple signers. Update smime
   1741      application to support multiple signers.
   1742      [Steve Henson]
   1743 
   1744   *) New -macalg option to pkcs12 utility to allow setting of an alternative
   1745      digest MAC.
   1746      [Steve Henson]
   1747 
   1748   *) Initial support for PKCS#5 v2.0 PRFs other than default SHA1 HMAC.
   1749      Reorganize PBE internals to lookup from a static table using NIDs,
   1750      add support for HMAC PBE OID translation. Add a EVP_CIPHER ctrl:
   1751      EVP_CTRL_PBE_PRF_NID this allows a cipher to specify an alternative
   1752      PRF which will be automatically used with PBES2.
   1753      [Steve Henson]
   1754 
   1755   *) Replace the algorithm specific calls to generate keys in "req" with the
   1756      new API.
   1757      [Steve Henson]
   1758 
   1759   *) Update PKCS#7 enveloped data routines to use new API. This is now
   1760      supported by any public key method supporting the encrypt operation. A
   1761      ctrl is added to allow the public key algorithm to examine or modify
   1762      the PKCS#7 RecipientInfo structure if it needs to: for RSA this is
   1763      a no op.
   1764      [Steve Henson]
   1765 
   1766   *) Add a ctrl to asn1 method to allow a public key algorithm to express
   1767      a default digest type to use. In most cases this will be SHA1 but some
   1768      algorithms (such as GOST) need to specify an alternative digest. The
   1769      return value indicates how strong the prefernce is 1 means optional and
   1770      2 is mandatory (that is it is the only supported type). Modify
   1771      ASN1_item_sign() to accept a NULL digest argument to indicate it should
   1772      use the default md. Update openssl utilities to use the default digest
   1773      type for signing if it is not explicitly indicated.
   1774      [Steve Henson]
   1775 
   1776   *) Use OID cross reference table in ASN1_sign() and ASN1_verify(). New 
   1777      EVP_MD flag EVP_MD_FLAG_PKEY_METHOD_SIGNATURE. This uses the relevant
   1778      signing method from the key type. This effectively removes the link
   1779      between digests and public key types.
   1780      [Steve Henson]
   1781 
   1782   *) Add an OID cross reference table and utility functions. Its purpose is to
   1783      translate between signature OIDs such as SHA1WithrsaEncryption and SHA1,
   1784      rsaEncryption. This will allow some of the algorithm specific hackery
   1785      needed to use the correct OID to be removed. 
   1786      [Steve Henson]
   1787 
   1788   *) Remove algorithm specific dependencies when setting PKCS7_SIGNER_INFO
   1789      structures for PKCS7_sign(). They are now set up by the relevant public
   1790      key ASN1 method.
   1791      [Steve Henson]
   1792 
   1793   *) Add provisional EC pkey method with support for ECDSA and ECDH.
   1794      [Steve Henson]
   1795 
   1796   *) Add support for key derivation (agreement) in the API, DH method and
   1797      pkeyutl.
   1798      [Steve Henson]
   1799 
   1800   *) Add DSA pkey method and DH pkey methods, extend DH ASN1 method to support
   1801      public and private key formats. As a side effect these add additional 
   1802      command line functionality not previously available: DSA signatures can be
   1803      generated and verified using pkeyutl and DH key support and generation in
   1804      pkey, genpkey.
   1805      [Steve Henson]
   1806 
   1807   *) BeOS support.
   1808      [Oliver Tappe <zooey (a] hirschkaefer.de>]
   1809 
   1810   *) New make target "install_html_docs" installs HTML renditions of the
   1811      manual pages.
   1812      [Oliver Tappe <zooey (a] hirschkaefer.de>]
   1813 
   1814   *) New utility "genpkey" this is analagous to "genrsa" etc except it can
   1815      generate keys for any algorithm. Extend and update EVP_PKEY_METHOD to
   1816      support key and parameter generation and add initial key generation
   1817      functionality for RSA.
   1818      [Steve Henson]
   1819 
   1820   *) Add functions for main EVP_PKEY_method operations. The undocumented
   1821      functions EVP_PKEY_{encrypt,decrypt} have been renamed to
   1822      EVP_PKEY_{encrypt,decrypt}_old. 
   1823      [Steve Henson]
   1824 
   1825   *) Initial definitions for EVP_PKEY_METHOD. This will be a high level public
   1826      key API, doesn't do much yet.
   1827      [Steve Henson]
   1828 
   1829   *) New function EVP_PKEY_asn1_get0_info() to retrieve information about
   1830      public key algorithms. New option to openssl utility:
   1831      "list-public-key-algorithms" to print out info.
   1832      [Steve Henson]
   1833 
   1834   *) Implement the Supported Elliptic Curves Extension for
   1835      ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
   1836      [Douglas Stebila]
   1837 
   1838   *) Don't free up OIDs in OBJ_cleanup() if they are in use by EVP_MD or
   1839      EVP_CIPHER structures to avoid later problems in EVP_cleanup().
   1840      [Steve Henson]
   1841 
   1842   *) New utilities pkey and pkeyparam. These are similar to algorithm specific
   1843      utilities such as rsa, dsa, dsaparam etc except they process any key
   1844      type.
   1845      [Steve Henson]
   1846 
   1847   *) Transfer public key printing routines to EVP_PKEY_ASN1_METHOD. New 
   1848      functions EVP_PKEY_print_public(), EVP_PKEY_print_private(),
   1849      EVP_PKEY_print_param() to print public key data from an EVP_PKEY
   1850      structure.
   1851      [Steve Henson]
   1852 
   1853   *) Initial support for pluggable public key ASN1.
   1854      De-spaghettify the public key ASN1 handling. Move public and private
   1855      key ASN1 handling to a new EVP_PKEY_ASN1_METHOD structure. Relocate
   1856      algorithm specific handling to a single module within the relevant
   1857      algorithm directory. Add functions to allow (near) opaque processing
   1858      of public and private key structures.
   1859      [Steve Henson]
   1860 
   1861   *) Implement the Supported Point Formats Extension for
   1862      ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
   1863      [Douglas Stebila]
   1864 
   1865   *) Add initial support for RFC 4279 PSK TLS ciphersuites. Add members
   1866      for the psk identity [hint] and the psk callback functions to the
   1867      SSL_SESSION, SSL and SSL_CTX structure.
   1868      
   1869      New ciphersuites:
   1870          PSK-RC4-SHA, PSK-3DES-EDE-CBC-SHA, PSK-AES128-CBC-SHA,
   1871          PSK-AES256-CBC-SHA
   1872  
   1873      New functions:
   1874          SSL_CTX_use_psk_identity_hint
   1875          SSL_get_psk_identity_hint
   1876          SSL_get_psk_identity
   1877          SSL_use_psk_identity_hint
   1878 
   1879      [Mika Kousa and Pasi Eronen of Nokia Corporation]
   1880 
   1881   *) Add RFC 3161 compliant time stamp request creation, response generation
   1882      and response verification functionality.
   1883      [Zoltn Glzik <zglozik (a] opentsa.org>, The OpenTSA Project]
   1884 
   1885   *) Add initial support for TLS extensions, specifically for the server_name
   1886      extension so far.  The SSL_SESSION, SSL_CTX, and SSL data structures now
   1887      have new members for a host name.  The SSL data structure has an
   1888      additional member SSL_CTX *initial_ctx so that new sessions can be
   1889      stored in that context to allow for session resumption, even after the
   1890      SSL has been switched to a new SSL_CTX in reaction to a client's
   1891      server_name extension.
   1892 
   1893      New functions (subject to change):
   1894 
   1895          SSL_get_servername()
   1896          SSL_get_servername_type()
   1897          SSL_set_SSL_CTX()
   1898 
   1899      New CTRL codes and macros (subject to change):
   1900 
   1901          SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
   1902                                  - SSL_CTX_set_tlsext_servername_callback()
   1903          SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG
   1904                                       - SSL_CTX_set_tlsext_servername_arg()
   1905          SSL_CTRL_SET_TLSEXT_HOSTNAME           - SSL_set_tlsext_host_name()
   1906 
   1907      openssl s_client has a new '-servername ...' option.
   1908 
   1909      openssl s_server has new options '-servername_host ...', '-cert2 ...',
   1910      '-key2 ...', '-servername_fatal' (subject to change).  This allows
   1911      testing the HostName extension for a specific single host name ('-cert'
   1912      and '-key' remain fallbacks for handshakes without HostName
   1913      negotiation).  If the unrecogninzed_name alert has to be sent, this by
   1914      default is a warning; it becomes fatal with the '-servername_fatal'
   1915      option.
   1916 
   1917      [Peter Sylvester,  Remy Allais, Christophe Renou]
   1918 
   1919   *) Whirlpool hash implementation is added.
   1920      [Andy Polyakov]
   1921 
   1922   *) BIGNUM code on 64-bit SPARCv9 targets is switched from bn(64,64) to
   1923      bn(64,32). Because of instruction set limitations it doesn't have
   1924      any negative impact on performance. This was done mostly in order
   1925      to make it possible to share assembler modules, such as bn_mul_mont
   1926      implementations, between 32- and 64-bit builds without hassle.
   1927      [Andy Polyakov]
   1928 
   1929   *) Move code previously exiled into file crypto/ec/ec2_smpt.c
   1930      to ec2_smpl.c, and no longer require the OPENSSL_EC_BIN_PT_COMP
   1931      macro.
   1932      [Bodo Moeller]
   1933 
   1934   *) New candidate for BIGNUM assembler implementation, bn_mul_mont,
   1935      dedicated Montgomery multiplication procedure, is introduced.
   1936      BN_MONT_CTX is modified to allow bn_mul_mont to reach for higher
   1937      "64-bit" performance on certain 32-bit targets.
   1938      [Andy Polyakov]
   1939 
   1940   *) New option SSL_OP_NO_COMP to disable use of compression selectively
   1941      in SSL structures. New SSL ctrl to set maximum send fragment size. 
   1942      Save memory by seeting the I/O buffer sizes dynamically instead of
   1943      using the maximum available value.
   1944      [Steve Henson]
   1945 
   1946   *) New option -V for 'openssl ciphers'. This prints the ciphersuite code
   1947      in addition to the text details.
   1948      [Bodo Moeller]
   1949 
   1950   *) Very, very preliminary EXPERIMENTAL support for printing of general
   1951      ASN1 structures. This currently produces rather ugly output and doesn't
   1952      handle several customised structures at all.
   1953      [Steve Henson]
   1954 
   1955   *) Integrated support for PVK file format and some related formats such
   1956      as MS PUBLICKEYBLOB and PRIVATEKEYBLOB. Command line switches to support
   1957      these in the 'rsa' and 'dsa' utilities.
   1958      [Steve Henson]
   1959 
   1960   *) Support for PKCS#1 RSAPublicKey format on rsa utility command line.
   1961      [Steve Henson]
   1962 
   1963   *) Remove the ancient ASN1_METHOD code. This was only ever used in one
   1964      place for the (very old) "NETSCAPE" format certificates which are now
   1965      handled using new ASN1 code equivalents.
   1966      [Steve Henson]
   1967 
   1968   *) Let the TLSv1_method() etc. functions return a 'const' SSL_METHOD
   1969      pointer and make the SSL_METHOD parameter in SSL_CTX_new,
   1970      SSL_CTX_set_ssl_version and SSL_set_ssl_method 'const'.
   1971      [Nils Larsch]
   1972 
   1973   *) Modify CRL distribution points extension code to print out previously
   1974      unsupported fields. Enhance extension setting code to allow setting of
   1975      all fields.
   1976      [Steve Henson]
   1977 
   1978   *) Add print and set support for Issuing Distribution Point CRL extension.
   1979      [Steve Henson]
   1980 
   1981   *) Change 'Configure' script to enable Camellia by default.
   1982      [NTT]
   1983 
   1984  Changes between 0.9.8m and 0.9.8n [24 Mar 2010]
   1985 
   1986   *) When rejecting SSL/TLS records due to an incorrect version number, never
   1987      update s->server with a new major version number.  As of
   1988      - OpenSSL 0.9.8m if 'short' is a 16-bit type,
   1989      - OpenSSL 0.9.8f if 'short' is longer than 16 bits,
   1990      the previous behavior could result in a read attempt at NULL when
   1991      receiving specific incorrect SSL/TLS records once record payload
   1992      protection is active.  (CVE-2010-0740)
   1993      [Bodo Moeller, Adam Langley <agl (a] chromium.org>]
   1994 
   1995   *) Fix for CVE-2010-0433 where some kerberos enabled versions of OpenSSL 
   1996      could be crashed if the relevant tables were not present (e.g. chrooted).
   1997      [Tomas Hoger <thoger (a] redhat.com>]
   1998 
   1999  Changes between 0.9.8l and 0.9.8m [25 Feb 2010]
   2000 
   2001   *) Always check bn_wexpend() return values for failure.  (CVE-2009-3245)
   2002      [Martin Olsson, Neel Mehta]
   2003 
   2004   *) Fix X509_STORE locking: Every 'objs' access requires a lock (to
   2005      accommodate for stack sorting, always a write lock!).
   2006      [Bodo Moeller]
   2007 
   2008   *) On some versions of WIN32 Heap32Next is very slow. This can cause
   2009      excessive delays in the RAND_poll(): over a minute. As a workaround
   2010      include a time check in the inner Heap32Next loop too.
   2011      [Steve Henson]
   2012 
   2013   *) The code that handled flushing of data in SSL/TLS originally used the
   2014      BIO_CTRL_INFO ctrl to see if any data was pending first. This caused
   2015      the problem outlined in PR#1949. The fix suggested there however can
   2016      trigger problems with buggy BIO_CTRL_WPENDING (e.g. some versions
   2017      of Apache). So instead simplify the code to flush unconditionally.
   2018      This should be fine since flushing with no data to flush is a no op.
   2019      [Steve Henson]
   2020 
   2021   *) Handle TLS versions 2.0 and later properly and correctly use the
   2022      highest version of TLS/SSL supported. Although TLS >= 2.0 is some way
   2023      off ancient servers have a habit of sticking around for a while...
   2024      [Steve Henson]
   2025 
   2026   *) Modify compression code so it frees up structures without using the
   2027      ex_data callbacks. This works around a problem where some applications
   2028      call CRYPTO_cleanup_all_ex_data() before application exit (e.g. when
   2029      restarting) then use compression (e.g. SSL with compression) later.
   2030      This results in significant per-connection memory leaks and
   2031      has caused some security issues including CVE-2008-1678 and
   2032      CVE-2009-4355.
   2033      [Steve Henson]
   2034 
   2035   *) Constify crypto/cast (i.e., <openssl/cast.h>): a CAST_KEY doesn't
   2036      change when encrypting or decrypting.
   2037      [Bodo Moeller]
   2038 
   2039   *) Add option SSL_OP_LEGACY_SERVER_CONNECT which will allow clients to
   2040      connect and renegotiate with servers which do not support RI.
   2041      Until RI is more widely deployed this option is enabled by default.
   2042      [Steve Henson]
   2043 
   2044   *) Add "missing" ssl ctrls to clear options and mode.
   2045      [Steve Henson]
   2046 
   2047   *) If client attempts to renegotiate and doesn't support RI respond with
   2048      a no_renegotiation alert as required by RFC5746.  Some renegotiating
   2049      TLS clients will continue a connection gracefully when they receive
   2050      the alert. Unfortunately OpenSSL mishandled this alert and would hang
   2051      waiting for a server hello which it will never receive. Now we treat a
   2052      received no_renegotiation alert as a fatal error. This is because
   2053      applications requesting a renegotiation might well expect it to succeed
   2054      and would have no code in place to handle the server denying it so the
   2055      only safe thing to do is to terminate the connection.
   2056      [Steve Henson]
   2057 
   2058   *) Add ctrl macro SSL_get_secure_renegotiation_support() which returns 1 if
   2059      peer supports secure renegotiation and 0 otherwise. Print out peer
   2060      renegotiation support in s_client/s_server.
   2061      [Steve Henson]
   2062 
   2063   *) Replace the highly broken and deprecated SPKAC certification method with
   2064      the updated NID creation version. This should correctly handle UTF8.
   2065      [Steve Henson]
   2066 
   2067   *) Implement RFC5746. Re-enable renegotiation but require the extension
   2068      as needed. Unfortunately, SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
   2069      turns out to be a bad idea. It has been replaced by
   2070      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION which can be set with
   2071      SSL_CTX_set_options(). This is really not recommended unless you
   2072      know what you are doing.
   2073      [Eric Rescorla <ekr (a] networkresonance.com>, Ben Laurie, Steve Henson]
   2074 
   2075   *) Fixes to stateless session resumption handling. Use initial_ctx when
   2076      issuing and attempting to decrypt tickets in case it has changed during
   2077      servername handling. Use a non-zero length session ID when attempting
   2078      stateless session resumption: this makes it possible to determine if
   2079      a resumption has occurred immediately after receiving server hello
   2080      (several places in OpenSSL subtly assume this) instead of later in
   2081      the handshake.
   2082      [Steve Henson]
   2083 
   2084   *) The functions ENGINE_ctrl(), OPENSSL_isservice(),
   2085      CMS_get1_RecipientRequest() and RAND_bytes() can return <=0 on error
   2086      fixes for a few places where the return code is not checked
   2087      correctly.
   2088      [Julia Lawall <julia (a] diku.dk>]
   2089 
   2090   *) Add --strict-warnings option to Configure script to include devteam
   2091      warnings in other configurations.
   2092      [Steve Henson]
   2093 
   2094   *) Add support for --libdir option and LIBDIR variable in makefiles. This
   2095      makes it possible to install openssl libraries in locations which
   2096      have names other than "lib", for example "/usr/lib64" which some
   2097      systems need.
   2098      [Steve Henson, based on patch from Jeremy Utley]
   2099 
   2100   *) Don't allow the use of leading 0x80 in OIDs. This is a violation of
   2101      X690 8.9.12 and can produce some misleading textual output of OIDs.
   2102      [Steve Henson, reported by Dan Kaminsky]
   2103 
   2104   *) Delete MD2 from algorithm tables. This follows the recommendation in
   2105      several standards that it is not used in new applications due to
   2106      several cryptographic weaknesses. For binary compatibility reasons
   2107      the MD2 API is still compiled in by default.
   2108      [Steve Henson]
   2109 
   2110   *) Add compression id to {d2i,i2d}_SSL_SESSION so it is correctly saved
   2111      and restored.
   2112      [Steve Henson]
   2113 
   2114   *) Rename uni2asc and asc2uni functions to OPENSSL_uni2asc and
   2115      OPENSSL_asc2uni conditionally on Netware platforms to avoid a name
   2116      clash.
   2117      [Guenter <lists (a] gknw.net>]
   2118 
   2119   *) Fix the server certificate chain building code to use X509_verify_cert(),
   2120      it used to have an ad-hoc builder which was unable to cope with anything
   2121      other than a simple chain.
   2122      [David Woodhouse <dwmw2 (a] infradead.org>, Steve Henson]
   2123 
   2124   *) Don't check self signed certificate signatures in X509_verify_cert()
   2125      by default (a flag can override this): it just wastes time without
   2126      adding any security. As a useful side effect self signed root CAs
   2127      with non-FIPS digests are now usable in FIPS mode.
   2128      [Steve Henson]
   2129 
   2130   *) In dtls1_process_out_of_seq_message() the check if the current message
   2131      is already buffered was missing. For every new message was memory
   2132      allocated, allowing an attacker to perform an denial of service attack
   2133      with sending out of seq handshake messages until there is no memory
   2134      left. Additionally every future messege was buffered, even if the
   2135      sequence number made no sense and would be part of another handshake.
   2136      So only messages with sequence numbers less than 10 in advance will be
   2137      buffered.  (CVE-2009-1378)
   2138      [Robin Seggelmann, discovered by Daniel Mentz] 	
   2139 
   2140   *) Records are buffered if they arrive with a future epoch to be
   2141      processed after finishing the corresponding handshake. There is
   2142      currently no limitation to this buffer allowing an attacker to perform
   2143      a DOS attack with sending records with future epochs until there is no
   2144      memory left. This patch adds the pqueue_size() function to detemine
   2145      the size of a buffer and limits the record buffer to 100 entries.
   2146      (CVE-2009-1377)
   2147      [Robin Seggelmann, discovered by Daniel Mentz] 	
   2148 
   2149   *) Keep a copy of frag->msg_header.frag_len so it can be used after the
   2150      parent structure is freed.  (CVE-2009-1379)
   2151      [Daniel Mentz] 	
   2152 
   2153   *) Handle non-blocking I/O properly in SSL_shutdown() call.
   2154      [Darryl Miles <darryl-mailinglists (a] netbauds.net>]
   2155 
   2156   *) Add 2.5.4.* OIDs
   2157      [Ilya O. <vrghost (a] gmail.com>]
   2158 
   2159  Changes between 0.9.8k and 0.9.8l  [5 Nov 2009]
   2160 
   2161   *) Disable renegotiation completely - this fixes a severe security
   2162      problem (CVE-2009-3555) at the cost of breaking all
   2163      renegotiation. Renegotiation can be re-enabled by setting
   2164      SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION in s3->flags at
   2165      run-time. This is really not recommended unless you know what
   2166      you're doing.
   2167      [Ben Laurie]
   2168 
   2169  Changes between 0.9.8j and 0.9.8k  [25 Mar 2009]
   2170 
   2171   *) Don't set val to NULL when freeing up structures, it is freed up by
   2172      underlying code. If sizeof(void *) > sizeof(long) this can result in
   2173      zeroing past the valid field. (CVE-2009-0789)
   2174      [Paolo Ganci <Paolo.Ganci (a] AdNovum.CH>]
   2175 
   2176   *) Fix bug where return value of CMS_SignerInfo_verify_content() was not
   2177      checked correctly. This would allow some invalid signed attributes to
   2178      appear to verify correctly. (CVE-2009-0591)
   2179      [Ivan Nestlerode <inestlerode (a] us.ibm.com>]
   2180 
   2181   *) Reject UniversalString and BMPString types with invalid lengths. This
   2182      prevents a crash in ASN1_STRING_print_ex() which assumes the strings have
   2183      a legal length. (CVE-2009-0590)
   2184      [Steve Henson]
   2185 
   2186   *) Set S/MIME signing as the default purpose rather than setting it 
   2187      unconditionally. This allows applications to override it at the store
   2188      level.
   2189      [Steve Henson]
   2190 
   2191   *) Permit restricted recursion of ASN1 strings. This is needed in practice
   2192      to handle some structures.
   2193      [Steve Henson]
   2194 
   2195   *) Improve efficiency of mem_gets: don't search whole buffer each time
   2196      for a '\n'
   2197      [Jeremy Shapiro <jnshapir (a] us.ibm.com>]
   2198 
   2199   *) New -hex option for openssl rand.
   2200      [Matthieu Herrb]
   2201 
   2202   *) Print out UTF8String and NumericString when parsing ASN1.
   2203      [Steve Henson]
   2204 
   2205   *) Support NumericString type for name components.
   2206      [Steve Henson]
   2207 
   2208   *) Allow CC in the environment to override the automatically chosen
   2209      compiler. Note that nothing is done to ensure flags work with the
   2210      chosen compiler.
   2211      [Ben Laurie]
   2212 
   2213  Changes between 0.9.8i and 0.9.8j  [07 Jan 2009]
   2214 
   2215   *) Properly check EVP_VerifyFinal() and similar return values
   2216      (CVE-2008-5077).
   2217      [Ben Laurie, Bodo Moeller, Google Security Team]
   2218 
   2219   *) Enable TLS extensions by default.
   2220      [Ben Laurie]
   2221 
   2222   *) Allow the CHIL engine to be loaded, whether the application is
   2223      multithreaded or not. (This does not release the developer from the
   2224      obligation to set up the dynamic locking callbacks.)
   2225      [Sander Temme <sander (a] temme.net>]
   2226 
   2227   *) Use correct exit code if there is an error in dgst command.
   2228      [Steve Henson; problem pointed out by Roland Dirlewanger]
   2229 
   2230   *) Tweak Configure so that you need to say "experimental-jpake" to enable
   2231      JPAKE, and need to use -DOPENSSL_EXPERIMENTAL_JPAKE in applications.
   2232      [Bodo Moeller]
   2233 
   2234   *) Add experimental JPAKE support, including demo authentication in
   2235      s_client and s_server.
   2236      [Ben Laurie]
   2237 
   2238   *) Set the comparison function in v3_addr_canonize().
   2239      [Rob Austein <sra (a] hactrn.net>]
   2240 
   2241   *) Add support for XMPP STARTTLS in s_client.
   2242      [Philip Paeps <philip (a] freebsd.org>]
   2243 
   2244   *) Change the server-side SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG behavior
   2245      to ensure that even with this option, only ciphersuites in the
   2246      server's preference list will be accepted.  (Note that the option
   2247      applies only when resuming a session, so the earlier behavior was
   2248      just about the algorithm choice for symmetric cryptography.)
   2249      [Bodo Moeller]
   2250 
   2251  Changes between 0.9.8h and 0.9.8i  [15 Sep 2008]
   2252 
   2253   *) Fix NULL pointer dereference if a DTLS server received
   2254      ChangeCipherSpec as first record (CVE-2009-1386).
   2255      [PR #1679]
   2256 
   2257   *) Fix a state transitition in s3_srvr.c and d1_srvr.c
   2258      (was using SSL3_ST_CW_CLNT_HELLO_B, should be ..._ST_SW_SRVR_...).
   2259      [Nagendra Modadugu]
   2260 
   2261   *) The fix in 0.9.8c that supposedly got rid of unsafe
   2262      double-checked locking was incomplete for RSA blinding,
   2263      addressing just one layer of what turns out to have been
   2264      doubly unsafe triple-checked locking.
   2265 
   2266      So now fix this for real by retiring the MONT_HELPER macro
   2267      in crypto/rsa/rsa_eay.c.
   2268 
   2269      [Bodo Moeller; problem pointed out by Marius Schilder]
   2270 
   2271   *) Various precautionary measures:
   2272 
   2273      - Avoid size_t integer overflow in HASH_UPDATE (md32_common.h).
   2274 
   2275      - Avoid a buffer overflow in d2i_SSL_SESSION() (ssl_asn1.c).
   2276        (NB: This would require knowledge of the secret session ticket key
   2277        to exploit, in which case you'd be SOL either way.)
   2278 
   2279      - Change bn_nist.c so that it will properly handle input BIGNUMs
   2280        outside the expected range.
   2281 
   2282      - Enforce the 'num' check in BN_div() (bn_div.c) for non-BN_DEBUG
   2283        builds.
   2284 
   2285      [Neel Mehta, Bodo Moeller]
   2286 
   2287   *) Allow engines to be "soft loaded" - i.e. optionally don't die if
   2288      the load fails. Useful for distros.
   2289      [Ben Laurie and the FreeBSD team]
   2290 
   2291   *) Add support for Local Machine Keyset attribute in PKCS#12 files.
   2292      [Steve Henson]
   2293 
   2294   *) Fix BN_GF2m_mod_arr() top-bit cleanup code.
   2295      [Huang Ying]
   2296 
   2297   *) Expand ENGINE to support engine supplied SSL client certificate functions.
   2298 
   2299      This work was sponsored by Logica.
   2300      [Steve Henson]
   2301 
   2302   *) Add CryptoAPI ENGINE to support use of RSA and DSA keys held in Windows
   2303      keystores. Support for SSL/TLS client authentication too.
   2304      Not compiled unless enable-capieng specified to Configure.
   2305 
   2306      This work was sponsored by Logica.
   2307      [Steve Henson]
   2308 
   2309   *) Fix bug in X509_ATTRIBUTE creation: dont set attribute using
   2310      ASN1_TYPE_set1 if MBSTRING flag set. This bug would crash certain
   2311      attribute creation routines such as certifcate requests and PKCS#12
   2312      files.
   2313      [Steve Henson]
   2314 
   2315  Changes between 0.9.8g and 0.9.8h  [28 May 2008]
   2316 
   2317   *) Fix flaw if 'Server Key exchange message' is omitted from a TLS
   2318      handshake which could lead to a cilent crash as found using the
   2319      Codenomicon TLS test suite (CVE-2008-1672) 
   2320      [Steve Henson, Mark Cox]
   2321 
   2322   *) Fix double free in TLS server name extensions which could lead to
   2323      a remote crash found by Codenomicon TLS test suite (CVE-2008-0891) 
   2324      [Joe Orton]
   2325 
   2326   *) Clear error queue in SSL_CTX_use_certificate_chain_file()
   2327 
   2328      Clear the error queue to ensure that error entries left from
   2329      older function calls do not interfere with the correct operation.
   2330      [Lutz Jaenicke, Erik de Castro Lopo]
   2331 
   2332   *) Remove root CA certificates of commercial CAs:
   2333 
   2334      The OpenSSL project does not recommend any specific CA and does not
   2335      have any policy with respect to including or excluding any CA.
   2336      Therefore it does not make any sense to ship an arbitrary selection
   2337      of root CA certificates with the OpenSSL software.
   2338      [Lutz Jaenicke]
   2339 
   2340   *) RSA OAEP patches to fix two separate invalid memory reads.
   2341      The first one involves inputs when 'lzero' is greater than
   2342      'SHA_DIGEST_LENGTH' (it would read about SHA_DIGEST_LENGTH bytes
   2343      before the beginning of from). The second one involves inputs where
   2344      the 'db' section contains nothing but zeroes (there is a one-byte
   2345      invalid read after the end of 'db').
   2346      [Ivan Nestlerode <inestlerode (a] us.ibm.com>]
   2347 
   2348   *) Partial backport from 0.9.9-dev:
   2349 
   2350      Introduce bn_mul_mont (dedicated Montgomery multiplication
   2351      procedure) as a candidate for BIGNUM assembler implementation.
   2352      While 0.9.9-dev uses assembler for various architectures, only
   2353      x86_64 is available by default here in the 0.9.8 branch, and
   2354      32-bit x86 is available through a compile-time setting.
   2355 
   2356      To try the 32-bit x86 assembler implementation, use Configure
   2357      option "enable-montasm" (which exists only for this backport).
   2358 
   2359      As "enable-montasm" for 32-bit x86 disclaims code stability
   2360      anyway, in this constellation we activate additional code
   2361      backported from 0.9.9-dev for further performance improvements,
   2362      namely BN_from_montgomery_word.  (To enable this otherwise,
   2363      e.g. x86_64, try "-DMONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD".)
   2364 
   2365      [Andy Polyakov (backport partially by Bodo Moeller)]
   2366 
   2367   *) Add TLS session ticket callback. This allows an application to set
   2368      TLS ticket cipher and HMAC keys rather than relying on hardcoded fixed
   2369      values. This is useful for key rollover for example where several key
   2370      sets may exist with different names.
   2371      [Steve Henson]
   2372 
   2373   *) Reverse ENGINE-internal logic for caching default ENGINE handles.
   2374      This was broken until now in 0.9.8 releases, such that the only way
   2375      a registered ENGINE could be used (assuming it initialises
   2376      successfully on the host) was to explicitly set it as the default
   2377      for the relevant algorithms. This is in contradiction with 0.9.7
   2378      behaviour and the documentation. With this fix, when an ENGINE is
   2379      registered into a given algorithm's table of implementations, the
   2380      'uptodate' flag is reset so that auto-discovery will be used next
   2381      time a new context for that algorithm attempts to select an
   2382      implementation.
   2383      [Ian Lister (tweaked by Geoff Thorpe)]
   2384 
   2385   *) Backport of CMS code to OpenSSL 0.9.8. This differs from the 0.9.9
   2386      implemention in the following ways:
   2387 
   2388      Lack of EVP_PKEY_ASN1_METHOD means algorithm parameters have to be
   2389      hard coded.
   2390 
   2391      Lack of BER streaming support means one pass streaming processing is
   2392      only supported if data is detached: setting the streaming flag is
   2393      ignored for embedded content.
   2394 
   2395      CMS support is disabled by default and must be explicitly enabled
   2396      with the enable-cms configuration option.
   2397      [Steve Henson]
   2398 
   2399   *) Update the GMP engine glue to do direct copies between BIGNUM and
   2400      mpz_t when openssl and GMP use the same limb size. Otherwise the
   2401      existing "conversion via a text string export" trick is still used.
   2402      [Paul Sheer <paulsheer (a] gmail.com>]
   2403 
   2404   *) Zlib compression BIO. This is a filter BIO which compressed and
   2405      uncompresses any data passed through it.
   2406      [Steve Henson]
   2407 
   2408   *) Add AES_wrap_key() and AES_unwrap_key() functions to implement
   2409      RFC3394 compatible AES key wrapping.
   2410      [Steve Henson]
   2411 
   2412   *) Add utility functions to handle ASN1 structures. ASN1_STRING_set0():
   2413      sets string data without copying. X509_ALGOR_set0() and
   2414      X509_ALGOR_get0(): set and retrieve X509_ALGOR (AlgorithmIdentifier)
   2415      data. Attribute function X509at_get0_data_by_OBJ(): retrieves data
   2416      from an X509_ATTRIBUTE structure optionally checking it occurs only
   2417      once. ASN1_TYPE_set1(): set and ASN1_TYPE structure copying supplied
   2418      data.
   2419      [Steve Henson]
   2420 
   2421   *) Fix BN flag handling in RSA_eay_mod_exp() and BN_MONT_CTX_set()
   2422      to get the expected BN_FLG_CONSTTIME behavior.
   2423      [Bodo Moeller (Google)]
   2424   
   2425   *) Netware support:
   2426 
   2427      - fixed wrong usage of ioctlsocket() when build for LIBC BSD sockets
   2428      - fixed do_tests.pl to run the test suite with CLIB builds too (CLIB_OPT)
   2429      - added some more tests to do_tests.pl
   2430      - fixed RunningProcess usage so that it works with newer LIBC NDKs too
   2431      - removed usage of BN_LLONG for CLIB builds to avoid runtime dependency
   2432      - added new Configure targets netware-clib-bsdsock, netware-clib-gcc,
   2433        netware-clib-bsdsock-gcc, netware-libc-bsdsock-gcc
   2434      - various changes to netware.pl to enable gcc-cross builds on Win32
   2435        platform
   2436      - changed crypto/bio/b_sock.c to work with macro functions (CLIB BSD)
   2437      - various changes to fix missing prototype warnings
   2438      - fixed x86nasm.pl to create correct asm files for NASM COFF output
   2439      - added AES, WHIRLPOOL and CPUID assembler code to build files
   2440      - added missing AES assembler make rules to mk1mf.pl
   2441      - fixed order of includes in apps/ocsp.c so that e_os.h settings apply
   2442      [Guenter Knauf <eflash (a] gmx.net>]
   2443 
   2444   *) Implement certificate status request TLS extension defined in RFC3546.
   2445      A client can set the appropriate parameters and receive the encoded
   2446      OCSP response via a callback. A server can query the supplied parameters
   2447      and set the encoded OCSP response in the callback. Add simplified examples
   2448      to s_client and s_server.
   2449      [Steve Henson]
   2450 
   2451  Changes between 0.9.8f and 0.9.8g  [19 Oct 2007]
   2452 
   2453   *) Fix various bugs:
   2454      + Binary incompatibility of ssl_ctx_st structure
   2455      + DTLS interoperation with non-compliant servers
   2456      + Don't call get_session_cb() without proposed session
   2457      + Fix ia64 assembler code
   2458      [Andy Polyakov, Steve Henson]
   2459 
   2460  Changes between 0.9.8e and 0.9.8f  [11 Oct 2007]
   2461 
   2462   *) DTLS Handshake overhaul. There were longstanding issues with
   2463      OpenSSL DTLS implementation, which were making it impossible for
   2464      RFC 4347 compliant client to communicate with OpenSSL server.
   2465      Unfortunately just fixing these incompatibilities would "cut off"
   2466      pre-0.9.8f clients. To allow for hassle free upgrade post-0.9.8e
   2467      server keeps tolerating non RFC compliant syntax. The opposite is
   2468      not true, 0.9.8f client can not communicate with earlier server.
   2469      This update even addresses CVE-2007-4995.
   2470      [Andy Polyakov]
   2471 
   2472   *) Changes to avoid need for function casts in OpenSSL: some compilers
   2473      (gcc 4.2 and later) reject their use.
   2474      [Kurt Roeckx <kurt (a] roeckx.be>, Peter Hartley <pdh (a] utter.chaos.org.uk>,
   2475       Steve Henson]
   2476   
   2477   *) Add RFC4507 support to OpenSSL. This includes the corrections in
   2478      RFC4507bis. The encrypted ticket format is an encrypted encoded
   2479      SSL_SESSION structure, that way new session features are automatically
   2480      supported.
   2481 
   2482      If a client application caches session in an SSL_SESSION structure
   2483      support is transparent because tickets are now stored in the encoded
   2484      SSL_SESSION.
   2485      
   2486      The SSL_CTX structure automatically generates keys for ticket
   2487      protection in servers so again support should be possible
   2488      with no application modification.
   2489 
   2490      If a client or server wishes to disable RFC4507 support then the option
   2491      SSL_OP_NO_TICKET can be set.
   2492 
   2493      Add a TLS extension debugging callback to allow the contents of any client
   2494      or server extensions to be examined.
   2495 
   2496      This work was sponsored by Google.
   2497      [Steve Henson]
   2498 
   2499   *) Add initial support for TLS extensions, specifically for the server_name
   2500      extension so far.  The SSL_SESSION, SSL_CTX, and SSL data structures now
   2501      have new members for a host name.  The SSL data structure has an
   2502      additional member SSL_CTX *initial_ctx so that new sessions can be
   2503      stored in that context to allow for session resumption, even after the
   2504      SSL has been switched to a new SSL_CTX in reaction to a client's
   2505      server_name extension.
   2506 
   2507      New functions (subject to change):
   2508 
   2509          SSL_get_servername()
   2510          SSL_get_servername_type()
   2511          SSL_set_SSL_CTX()
   2512 
   2513      New CTRL codes and macros (subject to change):
   2514 
   2515          SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
   2516                                  - SSL_CTX_set_tlsext_servername_callback()
   2517          SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG
   2518                                       - SSL_CTX_set_tlsext_servername_arg()
   2519          SSL_CTRL_SET_TLSEXT_HOSTNAME           - SSL_set_tlsext_host_name()
   2520 
   2521      openssl s_client has a new '-servername ...' option.
   2522 
   2523      openssl s_server has new options '-servername_host ...', '-cert2 ...',
   2524      '-key2 ...', '-servername_fatal' (subject to change).  This allows
   2525      testing the HostName extension for a specific single host name ('-cert'
   2526      and '-key' remain fallbacks for handshakes without HostName
   2527      negotiation).  If the unrecogninzed_name alert has to be sent, this by
   2528      default is a warning; it becomes fatal with the '-servername_fatal'
   2529      option.
   2530 
   2531      [Peter Sylvester,  Remy Allais, Christophe Renou, Steve Henson]
   2532 
   2533   *) Add AES and SSE2 assembly language support to VC++ build.
   2534      [Steve Henson]
   2535 
   2536   *) Mitigate attack on final subtraction in Montgomery reduction.
   2537      [Andy Polyakov]
   2538 
   2539   *) Fix crypto/ec/ec_mult.c to work properly with scalars of value 0
   2540      (which previously caused an internal error).
   2541      [Bodo Moeller]
   2542 
   2543   *) Squeeze another 10% out of IGE mode when in != out.
   2544      [Ben Laurie]
   2545 
   2546   *) AES IGE mode speedup.
   2547      [Dean Gaudet (Google)]
   2548 
   2549   *) Add the Korean symmetric 128-bit cipher SEED (see
   2550      http://www.kisa.or.kr/kisa/seed/jsp/seed_eng.jsp) and
   2551      add SEED ciphersuites from RFC 4162:
   2552 
   2553         TLS_RSA_WITH_SEED_CBC_SHA      =  "SEED-SHA"
   2554         TLS_DHE_DSS_WITH_SEED_CBC_SHA  =  "DHE-DSS-SEED-SHA"
   2555         TLS_DHE_RSA_WITH_SEED_CBC_SHA  =  "DHE-RSA-SEED-SHA"
   2556         TLS_DH_anon_WITH_SEED_CBC_SHA  =  "ADH-SEED-SHA"
   2557 
   2558      To minimize changes between patchlevels in the OpenSSL 0.9.8
   2559      series, SEED remains excluded from compilation unless OpenSSL
   2560      is configured with 'enable-seed'.
   2561      [KISA, Bodo Moeller]
   2562 
   2563   *) Mitigate branch prediction attacks, which can be practical if a
   2564      single processor is shared, allowing a spy process to extract
   2565      information.  For detailed background information, see
   2566      http://eprint.iacr.org/2007/039 (O. Aciicmez, S. Gueron,
   2567      J.-P. Seifert, "New Branch Prediction Vulnerabilities in OpenSSL
   2568      and Necessary Software Countermeasures").  The core of the change
   2569      are new versions BN_div_no_branch() and
   2570      BN_mod_inverse_no_branch() of BN_div() and BN_mod_inverse(),
   2571      respectively, which are slower, but avoid the security-relevant
   2572      conditional branches.  These are automatically called by BN_div()
   2573      and BN_mod_inverse() if the flag BN_FLG_CONSTTIME is set for one
   2574      of the input BIGNUMs.  Also, BN_is_bit_set() has been changed to
   2575      remove a conditional branch.
   2576 
   2577      BN_FLG_CONSTTIME is the new name for the previous
   2578      BN_FLG_EXP_CONSTTIME flag, since it now affects more than just
   2579      modular exponentiation.  (Since OpenSSL 0.9.7h, setting this flag
   2580      in the exponent causes BN_mod_exp_mont() to use the alternative
   2581      implementation in BN_mod_exp_mont_consttime().)  The old name
   2582      remains as a deprecated alias.
   2583 
   2584      Similary, RSA_FLAG_NO_EXP_CONSTTIME is replaced by a more general
   2585      RSA_FLAG_NO_CONSTTIME flag since the RSA implementation now uses
   2586      constant-time implementations for more than just exponentiation.
   2587      Here too the old name is kept as a deprecated alias.
   2588 
   2589      BN_BLINDING_new() will now use BN_dup() for the modulus so that
   2590      the BN_BLINDING structure gets an independent copy of the
   2591      modulus.  This means that the previous "BIGNUM *m" argument to
   2592      BN_BLINDING_new() and to BN_BLINDING_create_param() now
   2593      essentially becomes "const BIGNUM *m", although we can't actually
   2594      change this in the header file before 0.9.9.  It allows
   2595      RSA_setup_blinding() to use BN_with_flags() on the modulus to
   2596      enable BN_FLG_CONSTTIME.
   2597 
   2598      [Matthew D Wood (Intel Corp)]
   2599 
   2600   *) In the SSL/TLS server implementation, be strict about session ID
   2601      context matching (which matters if an application uses a single
   2602      external cache for different purposes).  Previously,
   2603      out-of-context reuse was forbidden only if SSL_VERIFY_PEER was
   2604      set.  This did ensure strict client verification, but meant that,
   2605      with applications using a single external cache for quite
   2606      different requirements, clients could circumvent ciphersuite
   2607      restrictions for a given session ID context by starting a session
   2608      in a different context.
   2609      [Bodo Moeller]
   2610 
   2611   *) Include "!eNULL" in SSL_DEFAULT_CIPHER_LIST to make sure that
   2612      a ciphersuite string such as "DEFAULT:RSA" cannot enable
   2613      authentication-only ciphersuites.
   2614      [Bodo Moeller]
   2615 
   2616   *) Update the SSL_get_shared_ciphers() fix CVE-2006-3738 which was
   2617      not complete and could lead to a possible single byte overflow
   2618      (CVE-2007-5135) [Ben Laurie]
   2619 
   2620  Changes between 0.9.8d and 0.9.8e  [23 Feb 2007]
   2621 
   2622   *) Since AES128 and AES256 (and similarly Camellia128 and
   2623      Camellia256) share a single mask bit in the logic of
   2624      ssl/ssl_ciph.c, the code for masking out disabled ciphers needs a
   2625      kludge to work properly if AES128 is available and AES256 isn't
   2626      (or if Camellia128 is available and Camellia256 isn't).
   2627      [Victor Duchovni]
   2628 
   2629   *) Fix the BIT STRING encoding generated by crypto/ec/ec_asn1.c
   2630      (within i2d_ECPrivateKey, i2d_ECPKParameters, i2d_ECParameters):
   2631      When a point or a seed is encoded in a BIT STRING, we need to
   2632      prevent the removal of trailing zero bits to get the proper DER
   2633      encoding.  (By default, crypto/asn1/a_bitstr.c assumes the case
   2634      of a NamedBitList, for which trailing 0 bits need to be removed.)
   2635      [Bodo Moeller]
   2636 
   2637   *) Have SSL/TLS server implementation tolerate "mismatched" record
   2638      protocol version while receiving ClientHello even if the
   2639      ClientHello is fragmented.  (The server can't insist on the
   2640      particular protocol version it has chosen before the ServerHello
   2641      message has informed the client about his choice.)
   2642      [Bodo Moeller]
   2643 
   2644   *) Add RFC 3779 support.
   2645      [Rob Austein for ARIN, Ben Laurie]
   2646 
   2647   *) Load error codes if they are not already present instead of using a
   2648      static variable. This allows them to be cleanly unloaded and reloaded.
   2649      Improve header file function name parsing.
   2650      [Steve Henson]
   2651 
   2652   *) extend SMTP and IMAP protocol emulation in s_client to use EHLO
   2653      or CAPABILITY handshake as required by RFCs.
   2654      [Goetz Babin-Ebell]
   2655 
   2656  Changes between 0.9.8c and 0.9.8d  [28 Sep 2006]
   2657 
   2658   *) Introduce limits to prevent malicious keys being able to
   2659      cause a denial of service.  (CVE-2006-2940)
   2660      [Steve Henson, Bodo Moeller]
   2661 
   2662   *) Fix ASN.1 parsing of certain invalid structures that can result
   2663      in a denial of service.  (CVE-2006-2937)  [Steve Henson]
   2664 
   2665   *) Fix buffer overflow in SSL_get_shared_ciphers() function. 
   2666      (CVE-2006-3738) [Tavis Ormandy and Will Drewry, Google Security Team]
   2667 
   2668   *) Fix SSL client code which could crash if connecting to a
   2669      malicious SSLv2 server.  (CVE-2006-4343)
   2670      [Tavis Ormandy and Will Drewry, Google Security Team]
   2671 
   2672   *) Since 0.9.8b, ciphersuite strings naming explicit ciphersuites
   2673      match only those.  Before that, "AES256-SHA" would be interpreted
   2674      as a pattern and match "AES128-SHA" too (since AES128-SHA got
   2675      the same strength classification in 0.9.7h) as we currently only
   2676      have a single AES bit in the ciphersuite description bitmap.
   2677      That change, however, also applied to ciphersuite strings such as
   2678      "RC4-MD5" that intentionally matched multiple ciphersuites --
   2679      namely, SSL 2.0 ciphersuites in addition to the more common ones
   2680      from SSL 3.0/TLS 1.0.
   2681 
   2682      So we change the selection algorithm again: Naming an explicit
   2683      ciphersuite selects this one ciphersuite, and any other similar
   2684      ciphersuite (same bitmap) from *other* protocol versions.
   2685      Thus, "RC4-MD5" again will properly select both the SSL 2.0
   2686      ciphersuite and the SSL 3.0/TLS 1.0 ciphersuite.
   2687 
   2688      Since SSL 2.0 does not have any ciphersuites for which the
   2689      128/256 bit distinction would be relevant, this works for now.
   2690      The proper fix will be to use different bits for AES128 and
   2691      AES256, which would have avoided the problems from the beginning;
   2692      however, bits are scarce, so we can only do this in a new release
   2693      (not just a patchlevel) when we can change the SSL_CIPHER
   2694      definition to split the single 'unsigned long mask' bitmap into
   2695      multiple values to extend the available space.
   2696 
   2697      [Bodo Moeller]
   2698 
   2699  Changes between 0.9.8b and 0.9.8c  [05 Sep 2006]
   2700 
   2701   *) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
   2702      (CVE-2006-4339)  [Ben Laurie and Google Security Team]
   2703 
   2704   *) Add AES IGE and biIGE modes.
   2705      [Ben Laurie]
   2706 
   2707   *) Change the Unix randomness entropy gathering to use poll() when
   2708      possible instead of select(), since the latter has some
   2709      undesirable limitations.
   2710      [Darryl Miles via Richard Levitte and Bodo Moeller]
   2711 
   2712   *) Disable "ECCdraft" ciphersuites more thoroughly.  Now special
   2713      treatment in ssl/ssl_ciph.s makes sure that these ciphersuites
   2714      cannot be implicitly activated as part of, e.g., the "AES" alias.
   2715      However, please upgrade to OpenSSL 0.9.9[-dev] for
   2716      non-experimental use of the ECC ciphersuites to get TLS extension
   2717      support, which is required for curve and point format negotiation
   2718      to avoid potential handshake problems.
   2719      [Bodo Moeller]
   2720 
   2721   *) Disable rogue ciphersuites:
   2722 
   2723       - SSLv2 0x08 0x00 0x80 ("RC4-64-MD5")
   2724       - SSLv3/TLSv1 0x00 0x61 ("EXP1024-RC2-CBC-MD5")
   2725       - SSLv3/TLSv1 0x00 0x60 ("EXP1024-RC4-MD5")
   2726 
   2727      The latter two were purportedly from
   2728      draft-ietf-tls-56-bit-ciphersuites-0[01].txt, but do not really
   2729      appear there.
   2730 
   2731      Also deactivate the remaining ciphersuites from
   2732      draft-ietf-tls-56-bit-ciphersuites-01.txt.  These are just as
   2733      unofficial, and the ID has long expired.
   2734      [Bodo Moeller]
   2735 
   2736   *) Fix RSA blinding Heisenbug (problems sometimes occured on
   2737      dual-core machines) and other potential thread-safety issues.
   2738      [Bodo Moeller]
   2739 
   2740   *) Add the symmetric cipher Camellia (128-bit, 192-bit, 256-bit key
   2741      versions), which is now available for royalty-free use
   2742      (see http://info.isl.ntt.co.jp/crypt/eng/info/chiteki.html).
   2743      Also, add Camellia TLS ciphersuites from RFC 4132.
   2744 
   2745      To minimize changes between patchlevels in the OpenSSL 0.9.8
   2746      series, Camellia remains excluded from compilation unless OpenSSL
   2747      is configured with 'enable-camellia'.
   2748      [NTT]
   2749 
   2750   *) Disable the padding bug check when compression is in use. The padding
   2751      bug check assumes the first packet is of even length, this is not
   2752      necessarily true if compresssion is enabled and can result in false
   2753      positives causing handshake failure. The actual bug test is ancient
   2754      code so it is hoped that implementations will either have fixed it by
   2755      now or any which still have the bug do not support compression.
   2756      [Steve Henson]
   2757 
   2758  Changes between 0.9.8a and 0.9.8b  [04 May 2006]
   2759 
   2760   *) When applying a cipher rule check to see if string match is an explicit
   2761      cipher suite and only match that one cipher suite if it is.
   2762      [Steve Henson]
   2763 
   2764   *) Link in manifests for VC++ if needed.
   2765      [Austin Ziegler <halostatue (a] gmail.com>]
   2766 
   2767   *) Update support for ECC-based TLS ciphersuites according to
   2768      draft-ietf-tls-ecc-12.txt with proposed changes (but without
   2769      TLS extensions, which are supported starting with the 0.9.9
   2770      branch, not in the OpenSSL 0.9.8 branch).
   2771      [Douglas Stebila]
   2772 
   2773   *) New functions EVP_CIPHER_CTX_new() and EVP_CIPHER_CTX_free() to support
   2774      opaque EVP_CIPHER_CTX handling.
   2775      [Steve Henson]
   2776 
   2777   *) Fixes and enhancements to zlib compression code. We now only use
   2778      "zlib1.dll" and use the default __cdecl calling convention on Win32
   2779      to conform with the standards mentioned here:
   2780            http://www.zlib.net/DLL_FAQ.txt
   2781      Static zlib linking now works on Windows and the new --with-zlib-include
   2782      --with-zlib-lib options to Configure can be used to supply the location
   2783      of the headers and library. Gracefully handle case where zlib library
   2784      can't be loaded.
   2785      [Steve Henson]
   2786 
   2787   *) Several fixes and enhancements to the OID generation code. The old code
   2788      sometimes allowed invalid OIDs (1.X for X >= 40 for example), couldn't
   2789      handle numbers larger than ULONG_MAX, truncated printing and had a
   2790      non standard OBJ_obj2txt() behaviour.
   2791      [Steve Henson]
   2792 
   2793   *) Add support for building of engines under engine/ as shared libraries
   2794      under VC++ build system.
   2795      [Steve Henson]
   2796 
   2797   *) Corrected the numerous bugs in the Win32 path splitter in DSO.
   2798      Hopefully, we will not see any false combination of paths any more.
   2799      [Richard Levitte]
   2800 
   2801  Changes between 0.9.8 and 0.9.8a  [11 Oct 2005]
   2802 
   2803   *) Remove the functionality of SSL_OP_MSIE_SSLV2_RSA_PADDING
   2804      (part of SSL_OP_ALL).  This option used to disable the
   2805      countermeasure against man-in-the-middle protocol-version
   2806      rollback in the SSL 2.0 server implementation, which is a bad
   2807      idea.  (CVE-2005-2969)
   2808 
   2809      [Bodo Moeller; problem pointed out by Yutaka Oiwa (Research Center
   2810      for Information Security, National Institute of Advanced Industrial
   2811      Science and Technology [AIST], Japan)]
   2812 
   2813   *) Add two function to clear and return the verify parameter flags.
   2814      [Steve Henson]
   2815 
   2816   *) Keep cipherlists sorted in the source instead of sorting them at
   2817      runtime, thus removing the need for a lock.
   2818      [Nils Larsch]
   2819 
   2820   *) Avoid some small subgroup attacks in Diffie-Hellman.
   2821      [Nick Mathewson and Ben Laurie]
   2822 
   2823   *) Add functions for well-known primes.
   2824      [Nick Mathewson]
   2825 
   2826   *) Extended Windows CE support.
   2827      [Satoshi Nakamura and Andy Polyakov]
   2828 
   2829   *) Initialize SSL_METHOD structures at compile time instead of during
   2830      runtime, thus removing the need for a lock.
   2831      [Steve Henson]
   2832 
   2833   *) Make PKCS7_decrypt() work even if no certificate is supplied by
   2834      attempting to decrypt each encrypted key in turn. Add support to
   2835      smime utility.
   2836      [Steve Henson]
   2837 
   2838  Changes between 0.9.7h and 0.9.8  [05 Jul 2005]
   2839 
   2840   [NB: OpenSSL 0.9.7i and later 0.9.7 patch levels were released after
   2841   OpenSSL 0.9.8.]
   2842 
   2843   *) Add libcrypto.pc and libssl.pc for those who feel they need them.
   2844      [Richard Levitte]
   2845 
   2846   *) Change CA.sh and CA.pl so they don't bundle the CSR and the private
   2847      key into the same file any more.
   2848      [Richard Levitte]
   2849 
   2850   *) Add initial support for Win64, both IA64 and AMD64/x64 flavors.
   2851      [Andy Polyakov]
   2852 
   2853   *) Add -utf8 command line and config file option to 'ca'.
   2854      [Stefan <stf (a] udoma.org]
   2855 
   2856   *) Removed the macro des_crypt(), as it seems to conflict with some
   2857      libraries.  Use DES_crypt().
   2858      [Richard Levitte]
   2859 
   2860   *) Correct naming of the 'chil' and '4758cca' ENGINEs. This
   2861      involves renaming the source and generated shared-libs for
   2862      both. The engines will accept the corrected or legacy ids
   2863      ('ncipher' and '4758_cca' respectively) when binding. NB,
   2864      this only applies when building 'shared'.
   2865      [Corinna Vinschen <vinschen (a] redhat.com> and Geoff Thorpe]
   2866 
   2867   *) Add attribute functions to EVP_PKEY structure. Modify
   2868      PKCS12_create() to recognize a CSP name attribute and
   2869      use it. Make -CSP option work again in pkcs12 utility.
   2870      [Steve Henson]
   2871 
   2872   *) Add new functionality to the bn blinding code:
   2873      - automatic re-creation of the BN_BLINDING parameters after
   2874        a fixed number of uses (currently 32)
   2875      - add new function for parameter creation
   2876      - introduce flags to control the update behaviour of the
   2877        BN_BLINDING parameters
   2878      - hide BN_BLINDING structure
   2879      Add a second BN_BLINDING slot to the RSA structure to improve
   2880      performance when a single RSA object is shared among several
   2881      threads.
   2882      [Nils Larsch]
   2883 
   2884   *) Add support for DTLS.
   2885      [Nagendra Modadugu <nagendra (a] cs.stanford.edu> and Ben Laurie]
   2886 
   2887   *) Add support for DER encoded private keys (SSL_FILETYPE_ASN1)
   2888      to SSL_CTX_use_PrivateKey_file() and SSL_use_PrivateKey_file()
   2889      [Walter Goulet]
   2890 
   2891   *) Remove buggy and incompletet DH cert support from
   2892      ssl/ssl_rsa.c and ssl/s3_both.c
   2893      [Nils Larsch]
   2894 
   2895   *) Use SHA-1 instead of MD5 as the default digest algorithm for
   2896      the apps/openssl applications.
   2897      [Nils Larsch]
   2898 
   2899   *) Compile clean with "-Wall -Wmissing-prototypes
   2900      -Wstrict-prototypes -Wmissing-declarations -Werror". Currently
   2901      DEBUG_SAFESTACK must also be set.
   2902      [Ben Laurie]
   2903 
   2904   *) Change ./Configure so that certain algorithms can be disabled by default.
   2905      The new counterpiece to "no-xxx" is "enable-xxx".
   2906 
   2907      The patented RC5 and MDC2 algorithms will now be disabled unless
   2908      "enable-rc5" and "enable-mdc2", respectively, are specified.
   2909 
   2910      (IDEA remains enabled despite being patented.  This is because IDEA
   2911      is frequently required for interoperability, and there is no license
   2912      fee for non-commercial use.  As before, "no-idea" can be used to
   2913      avoid this algorithm.)
   2914 
   2915      [Bodo Moeller]
   2916 
   2917   *) Add processing of proxy certificates (see RFC 3820).  This work was
   2918      sponsored by KTH (The Royal Institute of Technology in Stockholm) and
   2919      EGEE (Enabling Grids for E-science in Europe).
   2920      [Richard Levitte]
   2921 
   2922   *) RC4 performance overhaul on modern architectures/implementations, such
   2923      as Intel P4, IA-64 and AMD64.
   2924      [Andy Polyakov]
   2925 
   2926   *) New utility extract-section.pl. This can be used specify an alternative
   2927      section number in a pod file instead of having to treat each file as
   2928      a separate case in Makefile. This can be done by adding two lines to the
   2929      pod file:
   2930 
   2931      =for comment openssl_section:XXX
   2932 
   2933      The blank line is mandatory.
   2934 
   2935      [Steve Henson]
   2936 
   2937   *) New arguments -certform, -keyform and -pass for s_client and s_server
   2938      to allow alternative format key and certificate files and passphrase
   2939      sources.
   2940      [Steve Henson]
   2941 
   2942   *) New structure X509_VERIFY_PARAM which combines current verify parameters,
   2943      update associated structures and add various utility functions.
   2944 
   2945      Add new policy related verify parameters, include policy checking in 
   2946      standard verify code. Enhance 'smime' application with extra parameters
   2947      to support policy checking and print out.
   2948      [Steve Henson]
   2949 
   2950   *) Add a new engine to support VIA PadLock ACE extensions in the VIA C3
   2951      Nehemiah processors. These extensions support AES encryption in hardware
   2952      as well as RNG (though RNG support is currently disabled).
   2953      [Michal Ludvig <michal (a] logix.cz>, with help from Andy Polyakov]
   2954 
   2955   *) Deprecate BN_[get|set]_params() functions (they were ignored internally).
   2956      [Geoff Thorpe]
   2957 
   2958   *) New FIPS 180-2 algorithms, SHA-224/-256/-384/-512 are implemented.
   2959      [Andy Polyakov and a number of other people]
   2960 
   2961   *) Improved PowerPC platform support. Most notably BIGNUM assembler
   2962      implementation contributed by IBM.
   2963      [Suresh Chari, Peter Waltenberg, Andy Polyakov]
   2964 
   2965   *) The new 'RSA_generate_key_ex' function now takes a BIGNUM for the public
   2966      exponent rather than 'unsigned long'. There is a corresponding change to
   2967      the new 'rsa_keygen' element of the RSA_METHOD structure.
   2968      [Jelte Jansen, Geoff Thorpe]
   2969 
   2970   *) Functionality for creating the initial serial number file is now
   2971      moved from CA.pl to the 'ca' utility with a new option -create_serial.
   2972 
   2973      (Before OpenSSL 0.9.7e, CA.pl used to initialize the serial
   2974      number file to 1, which is bound to cause problems.  To avoid
   2975      the problems while respecting compatibility between different 0.9.7
   2976      patchlevels, 0.9.7e  employed 'openssl x509 -next_serial' in
   2977      CA.pl for serial number initialization.  With the new release 0.9.8,
   2978      we can fix the problem directly in the 'ca' utility.)
   2979      [Steve Henson]
   2980 
   2981   *) Reduced header interdepencies by declaring more opaque objects in
   2982      ossl_typ.h. As a consequence, including some headers (eg. engine.h) will
   2983      give fewer recursive includes, which could break lazy source code - so
   2984      this change is covered by the OPENSSL_NO_DEPRECATED symbol. As always,
   2985      developers should define this symbol when building and using openssl to
   2986      ensure they track the recommended behaviour, interfaces, [etc], but
   2987      backwards-compatible behaviour prevails when this isn't defined.
   2988      [Geoff Thorpe]
   2989 
   2990   *) New function X509_POLICY_NODE_print() which prints out policy nodes.
   2991      [Steve Henson]
   2992 
   2993   *) Add new EVP function EVP_CIPHER_CTX_rand_key and associated functionality.
   2994      This will generate a random key of the appropriate length based on the 
   2995      cipher context. The EVP_CIPHER can provide its own random key generation
   2996      routine to support keys of a specific form. This is used in the des and 
   2997      3des routines to generate a key of the correct parity. Update S/MIME
   2998      code to use new functions and hence generate correct parity DES keys.
   2999      Add EVP_CHECK_DES_KEY #define to return an error if the key is not 
   3000      valid (weak or incorrect parity).
   3001      [Steve Henson]
   3002 
   3003   *) Add a local set of CRLs that can be used by X509_verify_cert() as well
   3004      as looking them up. This is useful when the verified structure may contain
   3005      CRLs, for example PKCS#7 signedData. Modify PKCS7_verify() to use any CRLs
   3006      present unless the new PKCS7_NO_CRL flag is asserted.
   3007      [Steve Henson]
   3008 
   3009   *) Extend ASN1 oid configuration module. It now additionally accepts the
   3010      syntax:
   3011 
   3012      shortName = some long name, 1.2.3.4
   3013      [Steve Henson]
   3014 
   3015   *) Reimplemented the BN_CTX implementation. There is now no more static
   3016      limitation on the number of variables it can handle nor the depth of the
   3017      "stack" handling for BN_CTX_start()/BN_CTX_end() pairs. The stack
   3018      information can now expand as required, and rather than having a single
   3019      static array of bignums, BN_CTX now uses a linked-list of such arrays
   3020      allowing it to expand on demand whilst maintaining the usefulness of
   3021      BN_CTX's "bundling".
   3022      [Geoff Thorpe]
   3023 
   3024   *) Add a missing BN_CTX parameter to the 'rsa_mod_exp' callback in RSA_METHOD
   3025      to allow all RSA operations to function using a single BN_CTX.
   3026      [Geoff Thorpe]
   3027 
   3028   *) Preliminary support for certificate policy evaluation and checking. This
   3029      is initially intended to pass the tests outlined in "Conformance Testing
   3030      of Relying Party Client Certificate Path Processing Logic" v1.07.
   3031      [Steve Henson]
   3032 
   3033   *) bn_dup_expand() has been deprecated, it was introduced in 0.9.7 and
   3034      remained unused and not that useful. A variety of other little bignum
   3035      tweaks and fixes have also been made continuing on from the audit (see
   3036      below).
   3037      [Geoff Thorpe]
   3038 
   3039   *) Constify all or almost all d2i, c2i, s2i and r2i functions, along with
   3040      associated ASN1, EVP and SSL functions and old ASN1 macros.
   3041      [Richard Levitte]
   3042 
   3043   *) BN_zero() only needs to set 'top' and 'neg' to zero for correct results,
   3044      and this should never fail. So the return value from the use of
   3045      BN_set_word() (which can fail due to needless expansion) is now deprecated;
   3046      if OPENSSL_NO_DEPRECATED is defined, BN_zero() is a void macro.
   3047      [Geoff Thorpe]
   3048 
   3049   *) BN_CTX_get() should return zero-valued bignums, providing the same
   3050      initialised value as BN_new().
   3051      [Geoff Thorpe, suggested by Ulf Mller]
   3052 
   3053   *) Support for inhibitAnyPolicy certificate extension.
   3054      [Steve Henson]
   3055 
   3056   *) An audit of the BIGNUM code is underway, for which debugging code is
   3057      enabled when BN_DEBUG is defined. This makes stricter enforcements on what
   3058      is considered valid when processing BIGNUMs, and causes execution to
   3059      assert() when a problem is discovered. If BN_DEBUG_RAND is defined,
   3060      further steps are taken to deliberately pollute unused data in BIGNUM
   3061      structures to try and expose faulty code further on. For now, openssl will
   3062      (in its default mode of operation) continue to tolerate the inconsistent
   3063      forms that it has tolerated in the past, but authors and packagers should
   3064      consider trying openssl and their own applications when compiled with
   3065      these debugging symbols defined. It will help highlight potential bugs in
   3066      their own code, and will improve the test coverage for OpenSSL itself. At
   3067      some point, these tighter rules will become openssl's default to improve
   3068      maintainability, though the assert()s and other overheads will remain only
   3069      in debugging configurations. See bn.h for more details.
   3070      [Geoff Thorpe, Nils Larsch, Ulf Mller]
   3071 
   3072   *) BN_CTX_init() has been deprecated, as BN_CTX is an opaque structure
   3073      that can only be obtained through BN_CTX_new() (which implicitly
   3074      initialises it). The presence of this function only made it possible
   3075      to overwrite an existing structure (and cause memory leaks).
   3076      [Geoff Thorpe]
   3077 
   3078   *) Because of the callback-based approach for implementing LHASH as a
   3079      template type, lh_insert() adds opaque objects to hash-tables and
   3080      lh_doall() or lh_doall_arg() are typically used with a destructor callback
   3081      to clean up those corresponding objects before destroying the hash table
   3082      (and losing the object pointers). So some over-zealous constifications in
   3083      LHASH have been relaxed so that lh_insert() does not take (nor store) the
   3084      objects as "const" and the lh_doall[_arg] callback wrappers are not
   3085      prototyped to have "const" restrictions on the object pointers they are
   3086      given (and so aren't required to cast them away any more).
   3087      [Geoff Thorpe]
   3088 
   3089   *) The tmdiff.h API was so ugly and minimal that our own timing utility
   3090      (speed) prefers to use its own implementation. The two implementations
   3091      haven't been consolidated as yet (volunteers?) but the tmdiff API has had
   3092      its object type properly exposed (MS_TM) instead of casting to/from "char
   3093      *". This may still change yet if someone realises MS_TM and "ms_time_***"
   3094      aren't necessarily the greatest nomenclatures - but this is what was used
   3095      internally to the implementation so I've used that for now.
   3096      [Geoff Thorpe]
   3097 
   3098   *) Ensure that deprecated functions do not get compiled when
   3099      OPENSSL_NO_DEPRECATED is defined. Some "openssl" subcommands and a few of
   3100      the self-tests were still using deprecated key-generation functions so
   3101      these have been updated also.
   3102      [Geoff Thorpe]
   3103 
   3104   *) Reorganise PKCS#7 code to separate the digest location functionality
   3105      into PKCS7_find_digest(), digest addtion into PKCS7_bio_add_digest().
   3106      New function PKCS7_set_digest() to set the digest type for PKCS#7
   3107      digestedData type. Add additional code to correctly generate the
   3108      digestedData type and add support for this type in PKCS7 initialization
   3109      functions.
   3110      [Steve Henson]
   3111 
   3112   *) New function PKCS7_set0_type_other() this initializes a PKCS7 
   3113      structure of type "other".
   3114      [Steve Henson]
   3115 
   3116   *) Fix prime generation loop in crypto/bn/bn_prime.pl by making
   3117      sure the loop does correctly stop and breaking ("division by zero")
   3118      modulus operations are not performed. The (pre-generated) prime
   3119      table crypto/bn/bn_prime.h was already correct, but it could not be
   3120      re-generated on some platforms because of the "division by zero"
   3121      situation in the script.
   3122      [Ralf S. Engelschall]
   3123 
   3124   *) Update support for ECC-based TLS ciphersuites according to
   3125      draft-ietf-tls-ecc-03.txt: the KDF1 key derivation function with
   3126      SHA-1 now is only used for "small" curves (where the
   3127      representation of a field element takes up to 24 bytes); for
   3128      larger curves, the field element resulting from ECDH is directly
   3129      used as premaster secret.
   3130      [Douglas Stebila (Sun Microsystems Laboratories)]
   3131 
   3132   *) Add code for kP+lQ timings to crypto/ec/ectest.c, and add SEC2
   3133      curve secp160r1 to the tests.
   3134      [Douglas Stebila (Sun Microsystems Laboratories)]
   3135 
   3136   *) Add the possibility to load symbols globally with DSO.
   3137      [Gtz Babin-Ebell <babin-ebell (a] trustcenter.de> via Richard Levitte]
   3138 
   3139   *) Add the functions ERR_set_mark() and ERR_pop_to_mark() for better
   3140      control of the error stack.
   3141      [Richard Levitte]
   3142 
   3143   *) Add support for STORE in ENGINE.
   3144      [Richard Levitte]
   3145 
   3146   *) Add the STORE type.  The intention is to provide a common interface
   3147      to certificate and key stores, be they simple file-based stores, or
   3148      HSM-type store, or LDAP stores, or...
   3149      NOTE: The code is currently UNTESTED and isn't really used anywhere.
   3150      [Richard Levitte]
   3151 
   3152   *) Add a generic structure called OPENSSL_ITEM.  This can be used to
   3153      pass a list of arguments to any function as well as provide a way
   3154      for a function to pass data back to the caller.
   3155      [Richard Levitte]
   3156 
   3157   *) Add the functions BUF_strndup() and BUF_memdup().  BUF_strndup()
   3158      works like BUF_strdup() but can be used to duplicate a portion of
   3159      a string.  The copy gets NUL-terminated.  BUF_memdup() duplicates
   3160      a memory area.
   3161      [Richard Levitte]
   3162 
   3163   *) Add the function sk_find_ex() which works like sk_find(), but will
   3164      return an index to an element even if an exact match couldn't be
   3165      found.  The index is guaranteed to point at the element where the
   3166      searched-for key would be inserted to preserve sorting order.
   3167      [Richard Levitte]
   3168 
   3169   *) Add the function OBJ_bsearch_ex() which works like OBJ_bsearch() but
   3170      takes an extra flags argument for optional functionality.  Currently,
   3171      the following flags are defined:
   3172 
   3173 	OBJ_BSEARCH_VALUE_ON_NOMATCH
   3174 	This one gets OBJ_bsearch_ex() to return a pointer to the first
   3175 	element where the comparing function returns a negative or zero
   3176 	number.
   3177 
   3178 	OBJ_BSEARCH_FIRST_VALUE_ON_MATCH
   3179 	This one gets OBJ_bsearch_ex() to return a pointer to the first
   3180 	element where the comparing function returns zero.  This is useful
   3181 	if there are more than one element where the comparing function
   3182 	returns zero.
   3183      [Richard Levitte]
   3184 
   3185   *) Make it possible to create self-signed certificates with 'openssl ca'
   3186      in such a way that the self-signed certificate becomes part of the
   3187      CA database and uses the same mechanisms for serial number generation
   3188      as all other certificate signing.  The new flag '-selfsign' enables
   3189      this functionality.  Adapt CA.sh and CA.pl.in.
   3190      [Richard Levitte]
   3191 
   3192   *) Add functionality to check the public key of a certificate request
   3193      against a given private.  This is useful to check that a certificate
   3194      request can be signed by that key (self-signing).
   3195      [Richard Levitte]
   3196 
   3197   *) Make it possible to have multiple active certificates with the same
   3198      subject in the CA index file.  This is done only if the keyword
   3199      'unique_subject' is set to 'no' in the main CA section (default
   3200      if 'CA_default') of the configuration file.  The value is saved
   3201      with the database itself in a separate index attribute file,
   3202      named like the index file with '.attr' appended to the name.
   3203      [Richard Levitte]
   3204 
   3205   *) Generate muti valued AVAs using '+' notation in config files for
   3206      req and dirName.
   3207      [Steve Henson]
   3208 
   3209   *) Support for nameConstraints certificate extension.
   3210      [Steve Henson]
   3211 
   3212   *) Support for policyConstraints certificate extension.
   3213      [Steve Henson]
   3214 
   3215   *) Support for policyMappings certificate extension.
   3216      [Steve Henson]
   3217 
   3218   *) Make sure the default DSA_METHOD implementation only uses its
   3219      dsa_mod_exp() and/or bn_mod_exp() handlers if they are non-NULL,
   3220      and change its own handlers to be NULL so as to remove unnecessary
   3221      indirection. This lets alternative implementations fallback to the
   3222      default implementation more easily.
   3223      [Geoff Thorpe]
   3224 
   3225   *) Support for directoryName in GeneralName related extensions
   3226      in config files.
   3227      [Steve Henson]
   3228 
   3229   *) Make it possible to link applications using Makefile.shared.
   3230      Make that possible even when linking against static libraries!
   3231      [Richard Levitte]
   3232 
   3233   *) Support for single pass processing for S/MIME signing. This now
   3234      means that S/MIME signing can be done from a pipe, in addition
   3235      cleartext signing (multipart/signed type) is effectively streaming
   3236      and the signed data does not need to be all held in memory.
   3237 
   3238      This is done with a new flag PKCS7_STREAM. When this flag is set
   3239      PKCS7_sign() only initializes the PKCS7 structure and the actual signing
   3240      is done after the data is output (and digests calculated) in
   3241      SMIME_write_PKCS7().
   3242      [Steve Henson]
   3243 
   3244   *) Add full support for -rpath/-R, both in shared libraries and
   3245      applications, at least on the platforms where it's known how
   3246      to do it.
   3247      [Richard Levitte]
   3248 
   3249   *) In crypto/ec/ec_mult.c, implement fast point multiplication with
   3250      precomputation, based on wNAF splitting: EC_GROUP_precompute_mult()
   3251      will now compute a table of multiples of the generator that
   3252      makes subsequent invocations of EC_POINTs_mul() or EC_POINT_mul()
   3253      faster (notably in the case of a single point multiplication,
   3254      scalar * generator).
   3255      [Nils Larsch, Bodo Moeller]
   3256 
   3257   *) IPv6 support for certificate extensions. The various extensions
   3258      which use the IP:a.b.c.d can now take IPv6 addresses using the
   3259      formats of RFC1884 2.2 . IPv6 addresses are now also displayed
   3260      correctly.
   3261      [Steve Henson]
   3262 
   3263   *) Added an ENGINE that implements RSA by performing private key
   3264      exponentiations with the GMP library. The conversions to and from
   3265      GMP's mpz_t format aren't optimised nor are any montgomery forms
   3266      cached, and on x86 it appears OpenSSL's own performance has caught up.
   3267      However there are likely to be other architectures where GMP could
   3268      provide a boost. This ENGINE is not built in by default, but it can be
   3269      specified at Configure time and should be accompanied by the necessary
   3270      linker additions, eg;
   3271          ./config -DOPENSSL_USE_GMP -lgmp
   3272      [Geoff Thorpe]
   3273 
   3274   *) "openssl engine" will not display ENGINE/DSO load failure errors when
   3275      testing availability of engines with "-t" - the old behaviour is
   3276      produced by increasing the feature's verbosity with "-tt".
   3277      [Geoff Thorpe]
   3278 
   3279   *) ECDSA routines: under certain error conditions uninitialized BN objects
   3280      could be freed. Solution: make sure initialization is performed early
   3281      enough. (Reported and fix supplied by Nils Larsch <nla (a] trustcenter.de>
   3282      via PR#459)
   3283      [Lutz Jaenicke]
   3284 
   3285   *) Key-generation can now be implemented in RSA_METHOD, DSA_METHOD
   3286      and DH_METHOD (eg. by ENGINE implementations) to override the normal
   3287      software implementations. For DSA and DH, parameter generation can
   3288      also be overriden by providing the appropriate method callbacks.
   3289      [Geoff Thorpe]
   3290 
   3291   *) Change the "progress" mechanism used in key-generation and
   3292      primality testing to functions that take a new BN_GENCB pointer in
   3293      place of callback/argument pairs. The new API functions have "_ex"
   3294      postfixes and the older functions are reimplemented as wrappers for
   3295      the new ones. The OPENSSL_NO_DEPRECATED symbol can be used to hide
   3296      declarations of the old functions to help (graceful) attempts to
   3297      migrate to the new functions. Also, the new key-generation API
   3298      functions operate on a caller-supplied key-structure and return
   3299      success/failure rather than returning a key or NULL - this is to
   3300      help make "keygen" another member function of RSA_METHOD etc.
   3301 
   3302      Example for using the new callback interface:
   3303 
   3304           int (*my_callback)(int a, int b, BN_GENCB *cb) = ...;
   3305           void *my_arg = ...;
   3306           BN_GENCB my_cb;
   3307 
   3308           BN_GENCB_set(&my_cb, my_callback, my_arg);
   3309 
   3310           return BN_is_prime_ex(some_bignum, BN_prime_checks, NULL, &cb);
   3311           /* For the meaning of a, b in calls to my_callback(), see the
   3312            * documentation of the function that calls the callback.
   3313            * cb will point to my_cb; my_arg can be retrieved as cb->arg.
   3314            * my_callback should return 1 if it wants BN_is_prime_ex()
   3315            * to continue, or 0 to stop.
   3316            */
   3317 
   3318      [Geoff Thorpe]
   3319 
   3320   *) Change the ZLIB compression method to be stateful, and make it
   3321      available to TLS with the number defined in 
   3322      draft-ietf-tls-compression-04.txt.
   3323      [Richard Levitte]
   3324 
   3325   *) Add the ASN.1 structures and functions for CertificatePair, which
   3326      is defined as follows (according to X.509_4thEditionDraftV6.pdf):
   3327 
   3328      CertificatePair ::= SEQUENCE {
   3329         forward		[0]	Certificate OPTIONAL,
   3330         reverse		[1]	Certificate OPTIONAL,
   3331         -- at least one of the pair shall be present -- }
   3332 
   3333      Also implement the PEM functions to read and write certificate
   3334      pairs, and defined the PEM tag as "CERTIFICATE PAIR".
   3335 
   3336      This needed to be defined, mostly for the sake of the LDAP
   3337      attribute crossCertificatePair, but may prove useful elsewhere as
   3338      well.
   3339      [Richard Levitte]
   3340 
   3341   *) Make it possible to inhibit symlinking of shared libraries in
   3342      Makefile.shared, for Cygwin's sake.
   3343      [Richard Levitte]
   3344 
   3345   *) Extend the BIGNUM API by creating a function 
   3346           void BN_set_negative(BIGNUM *a, int neg);
   3347      and a macro that behave like
   3348           int  BN_is_negative(const BIGNUM *a);
   3349 
   3350      to avoid the need to access 'a->neg' directly in applications.
   3351      [Nils Larsch]
   3352 
   3353   *) Implement fast modular reduction for pseudo-Mersenne primes
   3354      used in NIST curves (crypto/bn/bn_nist.c, crypto/ec/ecp_nist.c).
   3355      EC_GROUP_new_curve_GFp() will now automatically use this
   3356      if applicable.
   3357      [Nils Larsch <nla (a] trustcenter.de>]
   3358 
   3359   *) Add new lock type (CRYPTO_LOCK_BN).
   3360      [Bodo Moeller]
   3361 
   3362   *) Change the ENGINE framework to automatically load engines
   3363      dynamically from specific directories unless they could be
   3364      found to already be built in or loaded.  Move all the
   3365      current engines except for the cryptodev one to a new
   3366      directory engines/.
   3367      The engines in engines/ are built as shared libraries if
   3368      the "shared" options was given to ./Configure or ./config.
   3369      Otherwise, they are inserted in libcrypto.a.
   3370      /usr/local/ssl/engines is the default directory for dynamic
   3371      engines, but that can be overriden at configure time through
   3372      the usual use of --prefix and/or --openssldir, and at run
   3373      time with the environment variable OPENSSL_ENGINES.
   3374      [Geoff Thorpe and Richard Levitte]
   3375 
   3376   *) Add Makefile.shared, a helper makefile to build shared
   3377      libraries.  Addapt Makefile.org.
   3378      [Richard Levitte]
   3379 
   3380   *) Add version info to Win32 DLLs.
   3381      [Peter 'Luna' Runestig" <peter (a] runestig.com>]
   3382 
   3383   *) Add new 'medium level' PKCS#12 API. Certificates and keys
   3384      can be added using this API to created arbitrary PKCS#12
   3385      files while avoiding the low level API.
   3386 
   3387      New options to PKCS12_create(), key or cert can be NULL and
   3388      will then be omitted from the output file. The encryption
   3389      algorithm NIDs can be set to -1 for no encryption, the mac
   3390      iteration count can be set to 0 to omit the mac.
   3391 
   3392      Enhance pkcs12 utility by making the -nokeys and -nocerts
   3393      options work when creating a PKCS#12 file. New option -nomac
   3394      to omit the mac, NONE can be set for an encryption algorithm.
   3395      New code is modified to use the enhanced PKCS12_create()
   3396      instead of the low level API.
   3397      [Steve Henson]
   3398 
   3399   *) Extend ASN1 encoder to support indefinite length constructed
   3400      encoding. This can output sequences tags and octet strings in
   3401      this form. Modify pk7_asn1.c to support indefinite length
   3402      encoding. This is experimental and needs additional code to
   3403      be useful, such as an ASN1 bio and some enhanced streaming
   3404      PKCS#7 code.
   3405 
   3406      Extend template encode functionality so that tagging is passed
   3407      down to the template encoder.
   3408      [Steve Henson]
   3409 
   3410   *) Let 'openssl req' fail if an argument to '-newkey' is not
   3411      recognized instead of using RSA as a default.
   3412      [Bodo Moeller]
   3413 
   3414   *) Add support for ECC-based ciphersuites from draft-ietf-tls-ecc-01.txt.
   3415      As these are not official, they are not included in "ALL";
   3416      the "ECCdraft" ciphersuite group alias can be used to select them.
   3417      [Vipul Gupta and Sumit Gupta (Sun Microsystems Laboratories)]
   3418 
   3419   *) Add ECDH engine support.
   3420      [Nils Gura and Douglas Stebila (Sun Microsystems Laboratories)]
   3421 
   3422   *) Add ECDH in new directory crypto/ecdh/.
   3423      [Douglas Stebila (Sun Microsystems Laboratories)]
   3424 
   3425   *) Let BN_rand_range() abort with an error after 100 iterations
   3426      without success (which indicates a broken PRNG).
   3427      [Bodo Moeller]
   3428 
   3429   *) Change BN_mod_sqrt() so that it verifies that the input value
   3430      is really the square of the return value.  (Previously,
   3431      BN_mod_sqrt would show GIGO behaviour.)
   3432      [Bodo Moeller]
   3433 
   3434   *) Add named elliptic curves over binary fields from X9.62, SECG,
   3435      and WAP/WTLS; add OIDs that were still missing.
   3436 
   3437      [Sheueling Chang Shantz and Douglas Stebila
   3438      (Sun Microsystems Laboratories)]
   3439 
   3440   *) Extend the EC library for elliptic curves over binary fields
   3441      (new files ec2_smpl.c, ec2_smpt.c, ec2_mult.c in crypto/ec/).
   3442      New EC_METHOD:
   3443 
   3444           EC_GF2m_simple_method
   3445 
   3446      New API functions:
   3447 
   3448           EC_GROUP_new_curve_GF2m
   3449           EC_GROUP_set_curve_GF2m
   3450           EC_GROUP_get_curve_GF2m
   3451           EC_POINT_set_affine_coordinates_GF2m
   3452           EC_POINT_get_affine_coordinates_GF2m
   3453           EC_POINT_set_compressed_coordinates_GF2m
   3454 
   3455      Point compression for binary fields is disabled by default for
   3456      patent reasons (compile with OPENSSL_EC_BIN_PT_COMP defined to
   3457      enable it).
   3458 
   3459      As binary polynomials are represented as BIGNUMs, various members
   3460      of the EC_GROUP and EC_POINT data structures can be shared
   3461      between the implementations for prime fields and binary fields;
   3462      the above ..._GF2m functions (except for EX_GROUP_new_curve_GF2m)
   3463      are essentially identical to their ..._GFp counterparts.
   3464      (For simplicity, the '..._GFp' prefix has been dropped from
   3465      various internal method names.)
   3466 
   3467      An internal 'field_div' method (similar to 'field_mul' and
   3468      'field_sqr') has been added; this is used only for binary fields.
   3469 
   3470      [Sheueling Chang Shantz and Douglas Stebila
   3471      (Sun Microsystems Laboratories)]
   3472 
   3473   *) Optionally dispatch EC_POINT_mul(), EC_POINT_precompute_mult()
   3474      through methods ('mul', 'precompute_mult').
   3475 
   3476      The generic implementations (now internally called 'ec_wNAF_mul'
   3477      and 'ec_wNAF_precomputed_mult') remain the default if these
   3478      methods are undefined.
   3479 
   3480      [Sheueling Chang Shantz and Douglas Stebila
   3481      (Sun Microsystems Laboratories)]
   3482 
   3483   *) New function EC_GROUP_get_degree, which is defined through
   3484      EC_METHOD.  For curves over prime fields, this returns the bit
   3485      length of the modulus.
   3486 
   3487      [Sheueling Chang Shantz and Douglas Stebila
   3488      (Sun Microsystems Laboratories)]
   3489 
   3490   *) New functions EC_GROUP_dup, EC_POINT_dup.
   3491      (These simply call ..._new  and ..._copy).
   3492 
   3493      [Sheueling Chang Shantz and Douglas Stebila
   3494      (Sun Microsystems Laboratories)]
   3495 
   3496   *) Add binary polynomial arithmetic software in crypto/bn/bn_gf2m.c.
   3497      Polynomials are represented as BIGNUMs (where the sign bit is not
   3498      used) in the following functions [macros]:  
   3499 
   3500           BN_GF2m_add
   3501           BN_GF2m_sub             [= BN_GF2m_add]
   3502           BN_GF2m_mod             [wrapper for BN_GF2m_mod_arr]
   3503           BN_GF2m_mod_mul         [wrapper for BN_GF2m_mod_mul_arr]
   3504           BN_GF2m_mod_sqr         [wrapper for BN_GF2m_mod_sqr_arr]
   3505           BN_GF2m_mod_inv
   3506           BN_GF2m_mod_exp         [wrapper for BN_GF2m_mod_exp_arr]
   3507           BN_GF2m_mod_sqrt        [wrapper for BN_GF2m_mod_sqrt_arr]
   3508           BN_GF2m_mod_solve_quad  [wrapper for BN_GF2m_mod_solve_quad_arr]
   3509           BN_GF2m_cmp             [= BN_ucmp]
   3510 
   3511      (Note that only the 'mod' functions are actually for fields GF(2^m).
   3512      BN_GF2m_add() is misnomer, but this is for the sake of consistency.)
   3513 
   3514      For some functions, an the irreducible polynomial defining a
   3515      field can be given as an 'unsigned int[]' with strictly
   3516      decreasing elements giving the indices of those bits that are set;
   3517      i.e., p[] represents the polynomial
   3518           f(t) = t^p[0] + t^p[1] + ... + t^p[k]
   3519      where
   3520           p[0] > p[1] > ... > p[k] = 0.
   3521      This applies to the following functions:
   3522 
   3523           BN_GF2m_mod_arr
   3524           BN_GF2m_mod_mul_arr
   3525           BN_GF2m_mod_sqr_arr
   3526           BN_GF2m_mod_inv_arr        [wrapper for BN_GF2m_mod_inv]
   3527           BN_GF2m_mod_div_arr        [wrapper for BN_GF2m_mod_div]
   3528           BN_GF2m_mod_exp_arr
   3529           BN_GF2m_mod_sqrt_arr
   3530           BN_GF2m_mod_solve_quad_arr
   3531           BN_GF2m_poly2arr
   3532           BN_GF2m_arr2poly
   3533 
   3534      Conversion can be performed by the following functions:
   3535 
   3536           BN_GF2m_poly2arr
   3537           BN_GF2m_arr2poly
   3538 
   3539      bntest.c has additional tests for binary polynomial arithmetic.
   3540 
   3541      Two implementations for BN_GF2m_mod_div() are available.
   3542      The default algorithm simply uses BN_GF2m_mod_inv() and
   3543      BN_GF2m_mod_mul().  The alternative algorithm is compiled in only
   3544      if OPENSSL_SUN_GF2M_DIV is defined (patent pending; read the
   3545      copyright notice in crypto/bn/bn_gf2m.c before enabling it).
   3546 
   3547      [Sheueling Chang Shantz and Douglas Stebila
   3548      (Sun Microsystems Laboratories)]
   3549 
   3550   *) Add new error code 'ERR_R_DISABLED' that can be used when some
   3551      functionality is disabled at compile-time.
   3552      [Douglas Stebila <douglas.stebila (a] sun.com>]
   3553 
   3554   *) Change default behaviour of 'openssl asn1parse' so that more
   3555      information is visible when viewing, e.g., a certificate:
   3556 
   3557      Modify asn1_parse2 (crypto/asn1/asn1_par.c) so that in non-'dump'
   3558      mode the content of non-printable OCTET STRINGs is output in a
   3559      style similar to INTEGERs, but with '[HEX DUMP]' prepended to
   3560      avoid the appearance of a printable string.
   3561      [Nils Larsch <nla (a] trustcenter.de>]
   3562 
   3563   *) Add 'asn1_flag' and 'asn1_form' member to EC_GROUP with access
   3564      functions
   3565           EC_GROUP_set_asn1_flag()
   3566           EC_GROUP_get_asn1_flag()
   3567           EC_GROUP_set_point_conversion_form()
   3568           EC_GROUP_get_point_conversion_form()
   3569      These control ASN1 encoding details:
   3570      - Curves (i.e., groups) are encoded explicitly unless asn1_flag
   3571        has been set to OPENSSL_EC_NAMED_CURVE.
   3572      - Points are encoded in uncompressed form by default; options for
   3573        asn1_for are as for point2oct, namely
   3574           POINT_CONVERSION_COMPRESSED
   3575           POINT_CONVERSION_UNCOMPRESSED
   3576           POINT_CONVERSION_HYBRID
   3577 
   3578      Also add 'seed' and 'seed_len' members to EC_GROUP with access
   3579      functions
   3580           EC_GROUP_set_seed()
   3581           EC_GROUP_get0_seed()
   3582           EC_GROUP_get_seed_len()
   3583      This is used only for ASN1 purposes (so far).
   3584      [Nils Larsch <nla (a] trustcenter.de>]
   3585 
   3586   *) Add 'field_type' member to EC_METHOD, which holds the NID
   3587      of the appropriate field type OID.  The new function
   3588      EC_METHOD_get_field_type() returns this value.
   3589      [Nils Larsch <nla (a] trustcenter.de>]
   3590 
   3591   *) Add functions 
   3592           EC_POINT_point2bn()
   3593           EC_POINT_bn2point()
   3594           EC_POINT_point2hex()
   3595           EC_POINT_hex2point()
   3596      providing useful interfaces to EC_POINT_point2oct() and
   3597      EC_POINT_oct2point().
   3598      [Nils Larsch <nla (a] trustcenter.de>]
   3599 
   3600   *) Change internals of the EC library so that the functions
   3601           EC_GROUP_set_generator()
   3602           EC_GROUP_get_generator()
   3603           EC_GROUP_get_order()
   3604           EC_GROUP_get_cofactor()
   3605      are implemented directly in crypto/ec/ec_lib.c and not dispatched
   3606      to methods, which would lead to unnecessary code duplication when
   3607      adding different types of curves.
   3608      [Nils Larsch <nla (a] trustcenter.de> with input by Bodo Moeller]
   3609 
   3610   *) Implement compute_wNAF (crypto/ec/ec_mult.c) without BIGNUM
   3611      arithmetic, and such that modified wNAFs are generated
   3612      (which avoid length expansion in many cases).
   3613      [Bodo Moeller]
   3614 
   3615   *) Add a function EC_GROUP_check_discriminant() (defined via
   3616      EC_METHOD) that verifies that the curve discriminant is non-zero.
   3617 
   3618      Add a function EC_GROUP_check() that makes some sanity tests
   3619      on a EC_GROUP, its generator and order.  This includes
   3620      EC_GROUP_check_discriminant().
   3621      [Nils Larsch <nla (a] trustcenter.de>]
   3622 
   3623   *) Add ECDSA in new directory crypto/ecdsa/.
   3624 
   3625      Add applications 'openssl ecparam' and 'openssl ecdsa'
   3626      (these are based on 'openssl dsaparam' and 'openssl dsa').
   3627 
   3628      ECDSA support is also included in various other files across the
   3629      library.  Most notably,
   3630      - 'openssl req' now has a '-newkey ecdsa:file' option;
   3631      - EVP_PKCS82PKEY (crypto/evp/evp_pkey.c) now can handle ECDSA;
   3632      - X509_PUBKEY_get (crypto/asn1/x_pubkey.c) and
   3633        d2i_PublicKey (crypto/asn1/d2i_pu.c) have been modified to make
   3634        them suitable for ECDSA where domain parameters must be
   3635        extracted before the specific public key;
   3636      - ECDSA engine support has been added.
   3637      [Nils Larsch <nla (a] trustcenter.de>]
   3638 
   3639   *) Include some named elliptic curves, and add OIDs from X9.62,
   3640      SECG, and WAP/WTLS.  Each curve can be obtained from the new
   3641      function
   3642           EC_GROUP_new_by_curve_name(),
   3643      and the list of available named curves can be obtained with
   3644           EC_get_builtin_curves().
   3645      Also add a 'curve_name' member to EC_GROUP objects, which can be
   3646      accessed via
   3647          EC_GROUP_set_curve_name()
   3648          EC_GROUP_get_curve_name()
   3649      [Nils Larsch <larsch (a] trustcenter.de, Bodo Moeller]
   3650  
   3651   *) Remove a few calls to bn_wexpand() in BN_sqr() (the one in there
   3652      was actually never needed) and in BN_mul().  The removal in BN_mul()
   3653      required a small change in bn_mul_part_recursive() and the addition
   3654      of the functions bn_cmp_part_words(), bn_sub_part_words() and
   3655      bn_add_part_words(), which do the same thing as bn_cmp_words(),
   3656      bn_sub_words() and bn_add_words() except they take arrays with
   3657      differing sizes.
   3658      [Richard Levitte]
   3659 
   3660  Changes between 0.9.7l and 0.9.7m  [23 Feb 2007]
   3661 
   3662   *) Cleanse PEM buffers before freeing them since they may contain 
   3663      sensitive data.
   3664      [Benjamin Bennett <ben (a] psc.edu>]
   3665 
   3666   *) Include "!eNULL" in SSL_DEFAULT_CIPHER_LIST to make sure that
   3667      a ciphersuite string such as "DEFAULT:RSA" cannot enable
   3668      authentication-only ciphersuites.
   3669      [Bodo Moeller]
   3670 
   3671   *) Since AES128 and AES256 share a single mask bit in the logic of
   3672      ssl/ssl_ciph.c, the code for masking out disabled ciphers needs a
   3673      kludge to work properly if AES128 is available and AES256 isn't.
   3674      [Victor Duchovni]
   3675 
   3676   *) Expand security boundary to match 1.1.1 module.
   3677      [Steve Henson]
   3678 
   3679   *) Remove redundant features: hash file source, editing of test vectors
   3680      modify fipsld to use external fips_premain.c signature.
   3681      [Steve Henson]
   3682 
   3683   *) New perl script mkfipsscr.pl to create shell scripts or batch files to
   3684      run algorithm test programs.
   3685      [Steve Henson]
   3686 
   3687   *) Make algorithm test programs more tolerant of whitespace.
   3688      [Steve Henson]
   3689 
   3690   *) Have SSL/TLS server implementation tolerate "mismatched" record
   3691      protocol version while receiving ClientHello even if the
   3692      ClientHello is fragmented.  (The server can't insist on the
   3693      particular protocol version it has chosen before the ServerHello
   3694      message has informed the client about his choice.)
   3695      [Bodo Moeller]
   3696 
   3697   *) Load error codes if they are not already present instead of using a
   3698      static variable. This allows them to be cleanly unloaded and reloaded.
   3699      [Steve Henson]
   3700 
   3701  Changes between 0.9.7k and 0.9.7l  [28 Sep 2006]
   3702 
   3703   *) Introduce limits to prevent malicious keys being able to
   3704      cause a denial of service.  (CVE-2006-2940)
   3705      [Steve Henson, Bodo Moeller]
   3706 
   3707   *) Fix ASN.1 parsing of certain invalid structures that can result
   3708      in a denial of service.  (CVE-2006-2937)  [Steve Henson]
   3709 
   3710   *) Fix buffer overflow in SSL_get_shared_ciphers() function. 
   3711      (CVE-2006-3738) [Tavis Ormandy and Will Drewry, Google Security Team]
   3712 
   3713   *) Fix SSL client code which could crash if connecting to a
   3714      malicious SSLv2 server.  (CVE-2006-4343)
   3715      [Tavis Ormandy and Will Drewry, Google Security Team]
   3716 
   3717   *) Change ciphersuite string processing so that an explicit
   3718      ciphersuite selects this one ciphersuite (so that "AES256-SHA"
   3719      will no longer include "AES128-SHA"), and any other similar
   3720      ciphersuite (same bitmap) from *other* protocol versions (so that
   3721      "RC4-MD5" will still include both the SSL 2.0 ciphersuite and the
   3722      SSL 3.0/TLS 1.0 ciphersuite).  This is a backport combining
   3723      changes from 0.9.8b and 0.9.8d.
   3724      [Bodo Moeller]
   3725 
   3726  Changes between 0.9.7j and 0.9.7k  [05 Sep 2006]
   3727 
   3728   *) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
   3729      (CVE-2006-4339)  [Ben Laurie and Google Security Team]
   3730 
   3731   *) Change the Unix randomness entropy gathering to use poll() when
   3732      possible instead of select(), since the latter has some
   3733      undesirable limitations.
   3734      [Darryl Miles via Richard Levitte and Bodo Moeller]
   3735 
   3736   *) Disable rogue ciphersuites:
   3737 
   3738       - SSLv2 0x08 0x00 0x80 ("RC4-64-MD5")
   3739       - SSLv3/TLSv1 0x00 0x61 ("EXP1024-RC2-CBC-MD5")
   3740       - SSLv3/TLSv1 0x00 0x60 ("EXP1024-RC4-MD5")
   3741 
   3742      The latter two were purportedly from
   3743      draft-ietf-tls-56-bit-ciphersuites-0[01].txt, but do not really
   3744      appear there.
   3745 
   3746      Also deactive the remaining ciphersuites from
   3747      draft-ietf-tls-56-bit-ciphersuites-01.txt.  These are just as
   3748      unofficial, and the ID has long expired.
   3749      [Bodo Moeller]
   3750 
   3751   *) Fix RSA blinding Heisenbug (problems sometimes occured on
   3752      dual-core machines) and other potential thread-safety issues.
   3753      [Bodo Moeller]
   3754 
   3755  Changes between 0.9.7i and 0.9.7j  [04 May 2006]
   3756 
   3757   *) Adapt fipsld and the build system to link against the validated FIPS
   3758      module in FIPS mode.
   3759      [Steve Henson]
   3760 
   3761   *) Fixes for VC++ 2005 build under Windows.
   3762      [Steve Henson]
   3763 
   3764   *) Add new Windows build target VC-32-GMAKE for VC++. This uses GNU make 
   3765      from a Windows bash shell such as MSYS. It is autodetected from the
   3766      "config" script when run from a VC++ environment. Modify standard VC++
   3767      build to use fipscanister.o from the GNU make build. 
   3768      [Steve Henson]
   3769 
   3770  Changes between 0.9.7h and 0.9.7i  [14 Oct 2005]
   3771 
   3772   *) Wrapped the definition of EVP_MAX_MD_SIZE in a #ifdef OPENSSL_FIPS.
   3773      The value now differs depending on if you build for FIPS or not.
   3774      BEWARE!  A program linked with a shared FIPSed libcrypto can't be
   3775      safely run with a non-FIPSed libcrypto, as it may crash because of
   3776      the difference induced by this change.
   3777      [Andy Polyakov]
   3778 
   3779  Changes between 0.9.7g and 0.9.7h  [11 Oct 2005]
   3780 
   3781   *) Remove the functionality of SSL_OP_MSIE_SSLV2_RSA_PADDING
   3782      (part of SSL_OP_ALL).  This option used to disable the
   3783      countermeasure against man-in-the-middle protocol-version
   3784      rollback in the SSL 2.0 server implementation, which is a bad
   3785      idea.  (CVE-2005-2969)
   3786 
   3787      [Bodo Moeller; problem pointed out by Yutaka Oiwa (Research Center
   3788      for Information Security, National Institute of Advanced Industrial
   3789      Science and Technology [AIST], Japan)]
   3790 
   3791   *) Minimal support for X9.31 signatures and PSS padding modes. This is
   3792      mainly for FIPS compliance and not fully integrated at this stage.
   3793      [Steve Henson]
   3794 
   3795   *) For DSA signing, unless DSA_FLAG_NO_EXP_CONSTTIME is set, perform
   3796      the exponentiation using a fixed-length exponent.  (Otherwise,
   3797      the information leaked through timing could expose the secret key
   3798      after many signatures; cf. Bleichenbacher's attack on DSA with
   3799      biased k.)
   3800      [Bodo Moeller]
   3801 
   3802   *) Make a new fixed-window mod_exp implementation the default for
   3803      RSA, DSA, and DH private-key operations so that the sequence of
   3804      squares and multiplies and the memory access pattern are
   3805      independent of the particular secret key.  This will mitigate
   3806      cache-timing and potential related attacks.
   3807 
   3808      BN_mod_exp_mont_consttime() is the new exponentiation implementation,
   3809      and this is automatically used by BN_mod_exp_mont() if the new flag
   3810      BN_FLG_EXP_CONSTTIME is set for the exponent.  RSA, DSA, and DH
   3811      will use this BN flag for private exponents unless the flag
   3812      RSA_FLAG_NO_EXP_CONSTTIME, DSA_FLAG_NO_EXP_CONSTTIME, or
   3813      DH_FLAG_NO_EXP_CONSTTIME, respectively, is set.
   3814 
   3815      [Matthew D Wood (Intel Corp), with some changes by Bodo Moeller]
   3816 
   3817   *) Change the client implementation for SSLv23_method() and
   3818      SSLv23_client_method() so that is uses the SSL 3.0/TLS 1.0
   3819      Client Hello message format if the SSL_OP_NO_SSLv2 option is set.
   3820      (Previously, the SSL 2.0 backwards compatible Client Hello
   3821      message format would be used even with SSL_OP_NO_SSLv2.)
   3822      [Bodo Moeller]
   3823 
   3824   *) Add support for smime-type MIME parameter in S/MIME messages which some
   3825      clients need.
   3826      [Steve Henson]
   3827 
   3828   *) New function BN_MONT_CTX_set_locked() to set montgomery parameters in
   3829      a threadsafe manner. Modify rsa code to use new function and add calls
   3830      to dsa and dh code (which had race conditions before).
   3831      [Steve Henson]
   3832 
   3833   *) Include the fixed error library code in the C error file definitions
   3834      instead of fixing them up at runtime. This keeps the error code
   3835      structures constant.
   3836      [Steve Henson]
   3837 
   3838  Changes between 0.9.7f and 0.9.7g  [11 Apr 2005]
   3839 
   3840   [NB: OpenSSL 0.9.7h and later 0.9.7 patch levels were released after
   3841   OpenSSL 0.9.8.]
   3842 
   3843   *) Fixes for newer kerberos headers. NB: the casts are needed because
   3844      the 'length' field is signed on one version and unsigned on another
   3845      with no (?) obvious way to tell the difference, without these VC++
   3846      complains. Also the "definition" of FAR (blank) is no longer included
   3847      nor is the error ENOMEM. KRB5_PRIVATE has to be set to 1 to pick up
   3848      some needed definitions.
   3849      [Steve Henson]
   3850 
   3851   *) Undo Cygwin change.
   3852      [Ulf Mller]
   3853 
   3854   *) Added support for proxy certificates according to RFC 3820.
   3855      Because they may be a security thread to unaware applications,
   3856      they must be explicitely allowed in run-time.  See
   3857      docs/HOWTO/proxy_certificates.txt for further information.
   3858      [Richard Levitte]
   3859 
   3860  Changes between 0.9.7e and 0.9.7f  [22 Mar 2005]
   3861 
   3862   *) Use (SSL_RANDOM_VALUE - 4) bytes of pseudo random data when generating
   3863      server and client random values. Previously
   3864      (SSL_RANDOM_VALUE - sizeof(time_t)) would be used which would result in
   3865      less random data when sizeof(time_t) > 4 (some 64 bit platforms).
   3866 
   3867      This change has negligible security impact because:
   3868 
   3869      1. Server and client random values still have 24 bytes of pseudo random
   3870         data.
   3871 
   3872      2. Server and client random values are sent in the clear in the initial
   3873         handshake.
   3874 
   3875      3. The master secret is derived using the premaster secret (48 bytes in
   3876         size for static RSA ciphersuites) as well as client server and random
   3877         values.
   3878 
   3879      The OpenSSL team would like to thank the UK NISCC for bringing this issue
   3880      to our attention. 
   3881 
   3882      [Stephen Henson, reported by UK NISCC]
   3883 
   3884   *) Use Windows randomness collection on Cygwin.
   3885      [Ulf Mller]
   3886 
   3887   *) Fix hang in EGD/PRNGD query when communication socket is closed
   3888      prematurely by EGD/PRNGD.
   3889      [Darren Tucker <dtucker (a] zip.com.au> via Lutz Jnicke, resolves #1014]
   3890 
   3891   *) Prompt for pass phrases when appropriate for PKCS12 input format.
   3892      [Steve Henson]
   3893 
   3894   *) Back-port of selected performance improvements from development
   3895      branch, as well as improved support for PowerPC platforms.
   3896      [Andy Polyakov]
   3897 
   3898   *) Add lots of checks for memory allocation failure, error codes to indicate
   3899      failure and freeing up memory if a failure occurs.
   3900      [Nauticus Networks SSL Team <openssl (a] nauticusnet.com>, Steve Henson]
   3901 
   3902   *) Add new -passin argument to dgst.
   3903      [Steve Henson]
   3904 
   3905   *) Perform some character comparisons of different types in X509_NAME_cmp:
   3906      this is needed for some certificates that reencode DNs into UTF8Strings
   3907      (in violation of RFC3280) and can't or wont issue name rollover
   3908      certificates.
   3909      [Steve Henson]
   3910 
   3911   *) Make an explicit check during certificate validation to see that
   3912      the CA setting in each certificate on the chain is correct.  As a
   3913      side effect always do the following basic checks on extensions,
   3914      not just when there's an associated purpose to the check:
   3915 
   3916       - if there is an unhandled critical extension (unless the user
   3917         has chosen to ignore this fault)
   3918       - if the path length has been exceeded (if one is set at all)
   3919       - that certain extensions fit the associated purpose (if one has
   3920         been given)
   3921      [Richard Levitte]
   3922 
   3923  Changes between 0.9.7d and 0.9.7e  [25 Oct 2004]
   3924 
   3925   *) Avoid a race condition when CRLs are checked in a multi threaded 
   3926      environment. This would happen due to the reordering of the revoked
   3927      entries during signature checking and serial number lookup. Now the
   3928      encoding is cached and the serial number sort performed under a lock.
   3929      Add new STACK function sk_is_sorted().
   3930      [Steve Henson]
   3931 
   3932   *) Add Delta CRL to the extension code.
   3933      [Steve Henson]
   3934 
   3935   *) Various fixes to s3_pkt.c so alerts are sent properly.
   3936      [David Holmes <d.holmes (a] f5.com>]
   3937 
   3938   *) Reduce the chances of duplicate issuer name and serial numbers (in
   3939      violation of RFC3280) using the OpenSSL certificate creation utilities.
   3940      This is done by creating a random 64 bit value for the initial serial
   3941      number when a serial number file is created or when a self signed
   3942      certificate is created using 'openssl req -x509'. The initial serial
   3943      number file is created using 'openssl x509 -next_serial' in CA.pl
   3944      rather than being initialized to 1.
   3945      [Steve Henson]
   3946 
   3947  Changes between 0.9.7c and 0.9.7d  [17 Mar 2004]
   3948 
   3949   *) Fix null-pointer assignment in do_change_cipher_spec() revealed           
   3950      by using the Codenomicon TLS Test Tool (CVE-2004-0079)                    
   3951      [Joe Orton, Steve Henson]   
   3952 
   3953   *) Fix flaw in SSL/TLS handshaking when using Kerberos ciphersuites
   3954      (CVE-2004-0112)
   3955      [Joe Orton, Steve Henson]   
   3956 
   3957   *) Make it possible to have multiple active certificates with the same
   3958      subject in the CA index file.  This is done only if the keyword
   3959      'unique_subject' is set to 'no' in the main CA section (default
   3960      if 'CA_default') of the configuration file.  The value is saved
   3961      with the database itself in a separate index attribute file,
   3962      named like the index file with '.attr' appended to the name.
   3963      [Richard Levitte]
   3964 
   3965   *) X509 verify fixes. Disable broken certificate workarounds when 
   3966      X509_V_FLAGS_X509_STRICT is set. Check CRL issuer has cRLSign set if
   3967      keyUsage extension present. Don't accept CRLs with unhandled critical
   3968      extensions: since verify currently doesn't process CRL extensions this
   3969      rejects a CRL with *any* critical extensions. Add new verify error codes
   3970      for these cases.
   3971      [Steve Henson]
   3972 
   3973   *) When creating an OCSP nonce use an OCTET STRING inside the extnValue.
   3974      A clarification of RFC2560 will require the use of OCTET STRINGs and 
   3975      some implementations cannot handle the current raw format. Since OpenSSL
   3976      copies and compares OCSP nonces as opaque blobs without any attempt at
   3977      parsing them this should not create any compatibility issues.
   3978      [Steve Henson]
   3979 
   3980   *) New md flag EVP_MD_CTX_FLAG_REUSE this allows md_data to be reused when
   3981      calling EVP_MD_CTX_copy_ex() to avoid calling OPENSSL_malloc(). Without
   3982      this HMAC (and other) operations are several times slower than OpenSSL
   3983      < 0.9.7.
   3984      [Steve Henson]
   3985 
   3986   *) Print out GeneralizedTime and UTCTime in ASN1_STRING_print_ex().
   3987      [Peter Sylvester <Peter.Sylvester (a] EdelWeb.fr>]
   3988 
   3989   *) Use the correct content when signing type "other".
   3990      [Steve Henson]
   3991 
   3992  Changes between 0.9.7b and 0.9.7c  [30 Sep 2003]
   3993 
   3994   *) Fix various bugs revealed by running the NISCC test suite:
   3995 
   3996      Stop out of bounds reads in the ASN1 code when presented with
   3997      invalid tags (CVE-2003-0543 and CVE-2003-0544).
   3998      
   3999      Free up ASN1_TYPE correctly if ANY type is invalid (CVE-2003-0545).
   4000 
   4001      If verify callback ignores invalid public key errors don't try to check
   4002      certificate signature with the NULL public key.
   4003 
   4004      [Steve Henson]
   4005 
   4006   *) New -ignore_err option in ocsp application to stop the server
   4007      exiting on the first error in a request.
   4008      [Steve Henson]
   4009 
   4010   *) In ssl3_accept() (ssl/s3_srvr.c) only accept a client certificate
   4011      if the server requested one: as stated in TLS 1.0 and SSL 3.0
   4012      specifications.
   4013      [Steve Henson]
   4014 
   4015   *) In ssl3_get_client_hello() (ssl/s3_srvr.c), tolerate additional
   4016      extra data after the compression methods not only for TLS 1.0
   4017      but also for SSL 3.0 (as required by the specification).
   4018      [Bodo Moeller; problem pointed out by Matthias Loepfe]
   4019 
   4020   *) Change X509_certificate_type() to mark the key as exported/exportable
   4021      when it's 512 *bits* long, not 512 bytes.
   4022      [Richard Levitte]
   4023 
   4024   *) Change AES_cbc_encrypt() so it outputs exact multiple of
   4025      blocks during encryption.
   4026      [Richard Levitte]
   4027 
   4028   *) Various fixes to base64 BIO and non blocking I/O. On write 
   4029      flushes were not handled properly if the BIO retried. On read
   4030      data was not being buffered properly and had various logic bugs.
   4031      This also affects blocking I/O when the data being decoded is a
   4032      certain size.
   4033      [Steve Henson]
   4034 
   4035   *) Various S/MIME bugfixes and compatibility changes:
   4036      output correct application/pkcs7 MIME type if
   4037      PKCS7_NOOLDMIMETYPE is set. Tolerate some broken signatures.
   4038      Output CR+LF for EOL if PKCS7_CRLFEOL is set (this makes opening
   4039      of files as .eml work). Correctly handle very long lines in MIME
   4040      parser.
   4041      [Steve Henson]
   4042 
   4043  Changes between 0.9.7a and 0.9.7b  [10 Apr 2003]
   4044 
   4045   *) Countermeasure against the Klima-Pokorny-Rosa extension of
   4046      Bleichbacher's attack on PKCS #1 v1.5 padding: treat
   4047      a protocol version number mismatch like a decryption error
   4048      in ssl3_get_client_key_exchange (ssl/s3_srvr.c).
   4049      [Bodo Moeller]
   4050 
   4051   *) Turn on RSA blinding by default in the default implementation
   4052      to avoid a timing attack. Applications that don't want it can call
   4053      RSA_blinding_off() or use the new flag RSA_FLAG_NO_BLINDING.
   4054      They would be ill-advised to do so in most cases.
   4055      [Ben Laurie, Steve Henson, Geoff Thorpe, Bodo Moeller]
   4056 
   4057   *) Change RSA blinding code so that it works when the PRNG is not
   4058      seeded (in this case, the secret RSA exponent is abused as
   4059      an unpredictable seed -- if it is not unpredictable, there
   4060      is no point in blinding anyway).  Make RSA blinding thread-safe
   4061      by remembering the creator's thread ID in rsa->blinding and
   4062      having all other threads use local one-time blinding factors
   4063      (this requires more computation than sharing rsa->blinding, but
   4064      avoids excessive locking; and if an RSA object is not shared
   4065      between threads, blinding will still be very fast).
   4066      [Bodo Moeller]
   4067 
   4068   *) Fixed a typo bug that would cause ENGINE_set_default() to set an
   4069      ENGINE as defaults for all supported algorithms irrespective of
   4070      the 'flags' parameter. 'flags' is now honoured, so applications
   4071      should make sure they are passing it correctly.
   4072      [Geoff Thorpe]
   4073 
   4074   *) Target "mingw" now allows native Windows code to be generated in
   4075      the Cygwin environment as well as with the MinGW compiler.
   4076      [Ulf Moeller] 
   4077 
   4078  Changes between 0.9.7 and 0.9.7a  [19 Feb 2003]
   4079 
   4080   *) In ssl3_get_record (ssl/s3_pkt.c), minimize information leaked
   4081      via timing by performing a MAC computation even if incorrrect
   4082      block cipher padding has been found.  This is a countermeasure
   4083      against active attacks where the attacker has to distinguish
   4084      between bad padding and a MAC verification error. (CVE-2003-0078)
   4085 
   4086      [Bodo Moeller; problem pointed out by Brice Canvel (EPFL),
   4087      Alain Hiltgen (UBS), Serge Vaudenay (EPFL), and
   4088      Martin Vuagnoux (EPFL, Ilion)]
   4089 
   4090   *) Make the no-err option work as intended.  The intention with no-err
   4091      is not to have the whole error stack handling routines removed from
   4092      libcrypto, it's only intended to remove all the function name and
   4093      reason texts, thereby removing some of the footprint that may not
   4094      be interesting if those errors aren't displayed anyway.
   4095 
   4096      NOTE: it's still possible for any application or module to have it's
   4097      own set of error texts inserted.  The routines are there, just not
   4098      used by default when no-err is given.
   4099      [Richard Levitte]
   4100 
   4101   *) Add support for FreeBSD on IA64.
   4102      [dirk.meyer (a] dinoex.sub.org via Richard Levitte, resolves #454]
   4103 
   4104   *) Adjust DES_cbc_cksum() so it returns the same value as the MIT
   4105      Kerberos function mit_des_cbc_cksum().  Before this change,
   4106      the value returned by DES_cbc_cksum() was like the one from
   4107      mit_des_cbc_cksum(), except the bytes were swapped.
   4108      [Kevin Greaney <Kevin.Greaney (a] hp.com> and Richard Levitte]
   4109 
   4110   *) Allow an application to disable the automatic SSL chain building.
   4111      Before this a rather primitive chain build was always performed in
   4112      ssl3_output_cert_chain(): an application had no way to send the 
   4113      correct chain if the automatic operation produced an incorrect result.
   4114 
   4115      Now the chain builder is disabled if either:
   4116 
   4117      1. Extra certificates are added via SSL_CTX_add_extra_chain_cert().
   4118 
   4119      2. The mode flag SSL_MODE_NO_AUTO_CHAIN is set.
   4120 
   4121      The reasoning behind this is that an application would not want the
   4122      auto chain building to take place if extra chain certificates are
   4123      present and it might also want a means of sending no additional
   4124      certificates (for example the chain has two certificates and the
   4125      root is omitted).
   4126      [Steve Henson]
   4127 
   4128   *) Add the possibility to build without the ENGINE framework.
   4129      [Steven Reddie <smr (a] essemer.com.au> via Richard Levitte]
   4130 
   4131   *) Under Win32 gmtime() can return NULL: check return value in
   4132      OPENSSL_gmtime(). Add error code for case where gmtime() fails.
   4133      [Steve Henson]
   4134 
   4135   *) DSA routines: under certain error conditions uninitialized BN objects
   4136      could be freed. Solution: make sure initialization is performed early
   4137      enough. (Reported and fix supplied by Ivan D Nestlerode <nestler (a] MIT.EDU>,
   4138      Nils Larsch <nla (a] trustcenter.de> via PR#459)
   4139      [Lutz Jaenicke]
   4140 
   4141   *) Another fix for SSLv2 session ID handling: the session ID was incorrectly
   4142      checked on reconnect on the client side, therefore session resumption
   4143      could still fail with a "ssl session id is different" error. This
   4144      behaviour is masked when SSL_OP_ALL is used due to
   4145      SSL_OP_MICROSOFT_SESS_ID_BUG being set.
   4146      Behaviour observed by Crispin Flowerday <crispin (a] flowerday.cx> as
   4147      followup to PR #377.
   4148      [Lutz Jaenicke]
   4149 
   4150   *) IA-32 assembler support enhancements: unified ELF targets, support
   4151      for SCO/Caldera platforms, fix for Cygwin shared build.
   4152      [Andy Polyakov]
   4153 
   4154   *) Add support for FreeBSD on sparc64.  As a consequence, support for
   4155      FreeBSD on non-x86 processors is separate from x86 processors on
   4156      the config script, much like the NetBSD support.
   4157      [Richard Levitte & Kris Kennaway <kris (a] obsecurity.org>]
   4158 
   4159  Changes between 0.9.6h and 0.9.7  [31 Dec 2002]
   4160 
   4161   [NB: OpenSSL 0.9.6i and later 0.9.6 patch levels were released after
   4162   OpenSSL 0.9.7.]
   4163 
   4164   *) Fix session ID handling in SSLv2 client code: the SERVER FINISHED
   4165      code (06) was taken as the first octet of the session ID and the last
   4166      octet was ignored consequently. As a result SSLv2 client side session
   4167      caching could not have worked due to the session ID mismatch between
   4168      client and server.
   4169      Behaviour observed by Crispin Flowerday <crispin (a] flowerday.cx> as
   4170      PR #377.
   4171      [Lutz Jaenicke]
   4172 
   4173   *) Change the declaration of needed Kerberos libraries to use EX_LIBS
   4174      instead of the special (and badly supported) LIBKRB5.  LIBKRB5 is
   4175      removed entirely.
   4176      [Richard Levitte]
   4177 
   4178   *) The hw_ncipher.c engine requires dynamic locks.  Unfortunately, it
   4179      seems that in spite of existing for more than a year, many application
   4180      author have done nothing to provide the necessary callbacks, which
   4181      means that this particular engine will not work properly anywhere.
   4182      This is a very unfortunate situation which forces us, in the name
   4183      of usability, to give the hw_ncipher.c a static lock, which is part
   4184      of libcrypto.
   4185      NOTE: This is for the 0.9.7 series ONLY.  This hack will never
   4186      appear in 0.9.8 or later.  We EXPECT application authors to have
   4187      dealt properly with this when 0.9.8 is released (unless we actually
   4188      make such changes in the libcrypto locking code that changes will
   4189      have to be made anyway).
   4190      [Richard Levitte]
   4191 
   4192   *) In asn1_d2i_read_bio() repeatedly call BIO_read() until all content
   4193      octets have been read, EOF or an error occurs. Without this change
   4194      some truncated ASN1 structures will not produce an error.
   4195      [Steve Henson]
   4196 
   4197   *) Disable Heimdal support, since it hasn't been fully implemented.
   4198      Still give the possibility to force the use of Heimdal, but with
   4199      warnings and a request that patches get sent to openssl-dev.
   4200      [Richard Levitte]
   4201 
   4202   *) Add the VC-CE target, introduce the WINCE sysname, and add
   4203      INSTALL.WCE and appropriate conditionals to make it build.
   4204      [Steven Reddie <smr (a] essemer.com.au> via Richard Levitte]
   4205 
   4206   *) Change the DLL names for Cygwin to cygcrypto-x.y.z.dll and
   4207      cygssl-x.y.z.dll, where x, y and z are the major, minor and
   4208      edit numbers of the version.
   4209      [Corinna Vinschen <vinschen (a] redhat.com> and Richard Levitte]
   4210 
   4211   *) Introduce safe string copy and catenation functions
   4212      (BUF_strlcpy() and BUF_strlcat()).
   4213      [Ben Laurie (CHATS) and Richard Levitte]
   4214 
   4215   *) Avoid using fixed-size buffers for one-line DNs.
   4216      [Ben Laurie (CHATS)]
   4217 
   4218   *) Add BUF_MEM_grow_clean() to avoid information leakage when
   4219      resizing buffers containing secrets, and use where appropriate.
   4220      [Ben Laurie (CHATS)]
   4221 
   4222   *) Avoid using fixed size buffers for configuration file location.
   4223      [Ben Laurie (CHATS)]
   4224 
   4225   *) Avoid filename truncation for various CA files.
   4226      [Ben Laurie (CHATS)]
   4227 
   4228   *) Use sizeof in preference to magic numbers.
   4229      [Ben Laurie (CHATS)]
   4230 
   4231   *) Avoid filename truncation in cert requests.
   4232      [Ben Laurie (CHATS)]
   4233 
   4234   *) Add assertions to check for (supposedly impossible) buffer
   4235      overflows.
   4236      [Ben Laurie (CHATS)]
   4237 
   4238   *) Don't cache truncated DNS entries in the local cache (this could
   4239      potentially lead to a spoofing attack).
   4240      [Ben Laurie (CHATS)]
   4241 
   4242   *) Fix various buffers to be large enough for hex/decimal
   4243      representations in a platform independent manner.
   4244      [Ben Laurie (CHATS)]
   4245 
   4246   *) Add CRYPTO_realloc_clean() to avoid information leakage when
   4247      resizing buffers containing secrets, and use where appropriate.
   4248      [Ben Laurie (CHATS)]
   4249 
   4250   *) Add BIO_indent() to avoid much slightly worrying code to do
   4251      indents.
   4252      [Ben Laurie (CHATS)]
   4253 
   4254   *) Convert sprintf()/BIO_puts() to BIO_printf().
   4255      [Ben Laurie (CHATS)]
   4256 
   4257   *) buffer_gets() could terminate with the buffer only half
   4258      full. Fixed.
   4259      [Ben Laurie (CHATS)]
   4260 
   4261   *) Add assertions to prevent user-supplied crypto functions from
   4262      overflowing internal buffers by having large block sizes, etc.
   4263      [Ben Laurie (CHATS)]
   4264 
   4265   *) New OPENSSL_assert() macro (similar to assert(), but enabled
   4266      unconditionally).
   4267      [Ben Laurie (CHATS)]
   4268 
   4269   *) Eliminate unused copy of key in RC4.
   4270      [Ben Laurie (CHATS)]
   4271 
   4272   *) Eliminate unused and incorrectly sized buffers for IV in pem.h.
   4273      [Ben Laurie (CHATS)]
   4274 
   4275   *) Fix off-by-one error in EGD path.
   4276      [Ben Laurie (CHATS)]
   4277 
   4278   *) If RANDFILE path is too long, ignore instead of truncating.
   4279      [Ben Laurie (CHATS)]
   4280 
   4281   *) Eliminate unused and incorrectly sized X.509 structure
   4282      CBCParameter.
   4283      [Ben Laurie (CHATS)]
   4284 
   4285   *) Eliminate unused and dangerous function knumber().
   4286      [Ben Laurie (CHATS)]
   4287 
   4288   *) Eliminate unused and dangerous structure, KSSL_ERR.
   4289      [Ben Laurie (CHATS)]
   4290 
   4291   *) Protect against overlong session ID context length in an encoded
   4292      session object. Since these are local, this does not appear to be
   4293      exploitable.
   4294      [Ben Laurie (CHATS)]
   4295 
   4296   *) Change from security patch (see 0.9.6e below) that did not affect
   4297      the 0.9.6 release series:
   4298 
   4299      Remote buffer overflow in SSL3 protocol - an attacker could
   4300      supply an oversized master key in Kerberos-enabled versions.
   4301      (CVE-2002-0657)
   4302      [Ben Laurie (CHATS)]
   4303 
   4304   *) Change the SSL kerb5 codes to match RFC 2712.
   4305      [Richard Levitte]
   4306 
   4307   *) Make -nameopt work fully for req and add -reqopt switch.
   4308      [Michael Bell <michael.bell (a] rz.hu-berlin.de>, Steve Henson]
   4309 
   4310   *) The "block size" for block ciphers in CFB and OFB mode should be 1.
   4311      [Steve Henson, reported by Yngve Nysaeter Pettersen <yngve (a] opera.com>]
   4312 
   4313   *) Make sure tests can be performed even if the corresponding algorithms
   4314      have been removed entirely.  This was also the last step to make
   4315      OpenSSL compilable with DJGPP under all reasonable conditions.
   4316      [Richard Levitte, Doug Kaufman <dkaufman (a] rahul.net>]
   4317 
   4318   *) Add cipher selection rules COMPLEMENTOFALL and COMPLEMENTOFDEFAULT
   4319      to allow version independent disabling of normally unselected ciphers,
   4320      which may be activated as a side-effect of selecting a single cipher.
   4321 
   4322      (E.g., cipher list string "RSA" enables ciphersuites that are left
   4323      out of "ALL" because they do not provide symmetric encryption.
   4324      "RSA:!COMPLEMEMENTOFALL" avoids these unsafe ciphersuites.)
   4325      [Lutz Jaenicke, Bodo Moeller]
   4326 
   4327   *) Add appropriate support for separate platform-dependent build
   4328      directories.  The recommended way to make a platform-dependent
   4329      build directory is the following (tested on Linux), maybe with
   4330      some local tweaks:
   4331 
   4332 	# Place yourself outside of the OpenSSL source tree.  In
   4333 	# this example, the environment variable OPENSSL_SOURCE
   4334 	# is assumed to contain the absolute OpenSSL source directory.
   4335 	mkdir -p objtree/"`uname -s`-`uname -r`-`uname -m`"
   4336 	cd objtree/"`uname -s`-`uname -r`-`uname -m`"
   4337 	(cd $OPENSSL_SOURCE; find . -type f) | while read F; do
   4338 		mkdir -p `dirname $F`
   4339 		ln -s $OPENSSL_SOURCE/$F $F
   4340 	done
   4341 
   4342      To be absolutely sure not to disturb the source tree, a "make clean"
   4343      is a good thing.  If it isn't successfull, don't worry about it,
   4344      it probably means the source directory is very clean.
   4345      [Richard Levitte]
   4346 
   4347   *) Make sure any ENGINE control commands make local copies of string
   4348      pointers passed to them whenever necessary. Otherwise it is possible
   4349      the caller may have overwritten (or deallocated) the original string
   4350      data when a later ENGINE operation tries to use the stored values.
   4351      [Gtz Babin-Ebell <babinebell (a] trustcenter.de>]
   4352 
   4353   *) Improve diagnostics in file reading and command-line digests.
   4354      [Ben Laurie aided and abetted by Solar Designer <solar (a] openwall.com>]
   4355 
   4356   *) Add AES modes CFB and OFB to the object database.  Correct an
   4357      error in AES-CFB decryption.
   4358      [Richard Levitte]
   4359 
   4360   *) Remove most calls to EVP_CIPHER_CTX_cleanup() in evp_enc.c, this 
   4361      allows existing EVP_CIPHER_CTX structures to be reused after
   4362      calling EVP_*Final(). This behaviour is used by encryption
   4363      BIOs and some applications. This has the side effect that
   4364      applications must explicitly clean up cipher contexts with
   4365      EVP_CIPHER_CTX_cleanup() or they will leak memory.
   4366      [Steve Henson]
   4367 
   4368   *) Check the values of dna and dnb in bn_mul_recursive before calling
   4369      bn_mul_comba (a non zero value means the a or b arrays do not contain
   4370      n2 elements) and fallback to bn_mul_normal if either is not zero.
   4371      [Steve Henson]
   4372 
   4373   *) Fix escaping of non-ASCII characters when using the -subj option
   4374      of the "openssl req" command line tool. (Robert Joop <joop (a] fokus.gmd.de>)
   4375      [Lutz Jaenicke]
   4376 
   4377   *) Make object definitions compliant to LDAP (RFC2256): SN is the short
   4378      form for "surname", serialNumber has no short form.
   4379      Use "mail" as the short name for "rfc822Mailbox" according to RFC2798;
   4380      therefore remove "mail" short name for "internet 7".
   4381      The OID for unique identifiers in X509 certificates is
   4382      x500UniqueIdentifier, not uniqueIdentifier.
   4383      Some more OID additions. (Michael Bell <michael.bell (a] rz.hu-berlin.de>)
   4384      [Lutz Jaenicke]
   4385 
   4386   *) Add an "init" command to the ENGINE config module and auto initialize
   4387      ENGINEs. Without any "init" command the ENGINE will be initialized 
   4388      after all ctrl commands have been executed on it. If init=1 the 
   4389      ENGINE is initailized at that point (ctrls before that point are run
   4390      on the uninitialized ENGINE and after on the initialized one). If
   4391      init=0 then the ENGINE will not be iniatialized at all.
   4392      [Steve Henson]
   4393 
   4394   *) Fix the 'app_verify_callback' interface so that the user-defined
   4395      argument is actually passed to the callback: In the
   4396      SSL_CTX_set_cert_verify_callback() prototype, the callback
   4397      declaration has been changed from
   4398           int (*cb)()
   4399      into
   4400           int (*cb)(X509_STORE_CTX *,void *);
   4401      in ssl_verify_cert_chain (ssl/ssl_cert.c), the call
   4402           i=s->ctx->app_verify_callback(&ctx)
   4403      has been changed into
   4404           i=s->ctx->app_verify_callback(&ctx, s->ctx->app_verify_arg).
   4405 
   4406      To update applications using SSL_CTX_set_cert_verify_callback(),
   4407      a dummy argument can be added to their callback functions.
   4408      [D. K. Smetters <smetters (a] parc.xerox.com>]
   4409 
   4410   *) Added the '4758cca' ENGINE to support IBM 4758 cards.
   4411      [Maurice Gittens <maurice (a] gittens.nl>, touchups by Geoff Thorpe]
   4412 
   4413   *) Add and OPENSSL_LOAD_CONF define which will cause
   4414      OpenSSL_add_all_algorithms() to load the openssl.cnf config file.
   4415      This allows older applications to transparently support certain
   4416      OpenSSL features: such as crypto acceleration and dynamic ENGINE loading.
   4417      Two new functions OPENSSL_add_all_algorithms_noconf() which will never
   4418      load the config file and OPENSSL_add_all_algorithms_conf() which will
   4419      always load it have also been added.
   4420      [Steve Henson]
   4421 
   4422   *) Add the OFB, CFB and CTR (all with 128 bit feedback) to AES.
   4423      Adjust NIDs and EVP layer.
   4424      [Stephen Sprunk <stephen (a] sprunk.org> and Richard Levitte]
   4425 
   4426   *) Config modules support in openssl utility.
   4427 
   4428      Most commands now load modules from the config file,
   4429      though in a few (such as version) this isn't done 
   4430      because it couldn't be used for anything.
   4431 
   4432      In the case of ca and req the config file used is
   4433      the same as the utility itself: that is the -config
   4434      command line option can be used to specify an
   4435      alternative file.
   4436      [Steve Henson]
   4437 
   4438   *) Move default behaviour from OPENSSL_config(). If appname is NULL
   4439      use "openssl_conf" if filename is NULL use default openssl config file.
   4440      [Steve Henson]
   4441 
   4442   *) Add an argument to OPENSSL_config() to allow the use of an alternative
   4443      config section name. Add a new flag to tolerate a missing config file
   4444      and move code to CONF_modules_load_file().
   4445      [Steve Henson]
   4446 
   4447   *) Support for crypto accelerator cards from Accelerated Encryption
   4448      Processing, www.aep.ie.  (Use engine 'aep')
   4449      The support was copied from 0.9.6c [engine] and adapted/corrected
   4450      to work with the new engine framework.
   4451      [AEP Inc. and Richard Levitte]
   4452 
   4453   *) Support for SureWare crypto accelerator cards from Baltimore
   4454      Technologies.  (Use engine 'sureware')
   4455      The support was copied from 0.9.6c [engine] and adapted
   4456      to work with the new engine framework.
   4457      [Richard Levitte]
   4458 
   4459   *) Have the CHIL engine fork-safe (as defined by nCipher) and actually
   4460      make the newer ENGINE framework commands for the CHIL engine work.
   4461      [Toomas Kiisk <vix (a] cyber.ee> and Richard Levitte]
   4462 
   4463   *) Make it possible to produce shared libraries on ReliantUNIX.
   4464      [Robert Dahlem <Robert.Dahlem (a] ffm2.siemens.de> via Richard Levitte]
   4465 
   4466   *) Add the configuration target debug-linux-ppro.
   4467      Make 'openssl rsa' use the general key loading routines
   4468      implemented in apps.c, and make those routines able to
   4469      handle the key format FORMAT_NETSCAPE and the variant
   4470      FORMAT_IISSGC.
   4471      [Toomas Kiisk <vix (a] cyber.ee> via Richard Levitte]
   4472 
   4473  *) Fix a crashbug and a logic bug in hwcrhk_load_pubkey().
   4474      [Toomas Kiisk <vix (a] cyber.ee> via Richard Levitte]
   4475 
   4476   *) Add -keyform to rsautl, and document -engine.
   4477      [Richard Levitte, inspired by Toomas Kiisk <vix (a] cyber.ee>]
   4478 
   4479   *) Change BIO_new_file (crypto/bio/bss_file.c) to use new
   4480      BIO_R_NO_SUCH_FILE error code rather than the generic
   4481      ERR_R_SYS_LIB error code if fopen() fails with ENOENT.
   4482      [Ben Laurie]
   4483 
   4484   *) Add new functions
   4485           ERR_peek_last_error
   4486           ERR_peek_last_error_line
   4487           ERR_peek_last_error_line_data.
   4488      These are similar to
   4489           ERR_peek_error
   4490           ERR_peek_error_line
   4491           ERR_peek_error_line_data,
   4492      but report on the latest error recorded rather than the first one
   4493      still in the error queue.
   4494      [Ben Laurie, Bodo Moeller]
   4495         
   4496   *) default_algorithms option in ENGINE config module. This allows things
   4497      like:
   4498      default_algorithms = ALL
   4499      default_algorithms = RSA, DSA, RAND, CIPHERS, DIGESTS
   4500      [Steve Henson]
   4501 
   4502   *) Prelminary ENGINE config module.
   4503      [Steve Henson]
   4504 
   4505   *) New experimental application configuration code.
   4506      [Steve Henson]
   4507 
   4508   *) Change the AES code to follow the same name structure as all other
   4509      symmetric ciphers, and behave the same way.  Move everything to
   4510      the directory crypto/aes, thereby obsoleting crypto/rijndael.
   4511      [Stephen Sprunk <stephen (a] sprunk.org> and Richard Levitte]
   4512 
   4513   *) SECURITY: remove unsafe setjmp/signal interaction from ui_openssl.c.
   4514      [Ben Laurie and Theo de Raadt]
   4515 
   4516   *) Add option to output public keys in req command.
   4517      [Massimiliano Pala madwolf (a] openca.org]
   4518 
   4519   *) Use wNAFs in EC_POINTs_mul() for improved efficiency
   4520      (up to about 10% better than before for P-192 and P-224).
   4521      [Bodo Moeller]
   4522 
   4523   *) New functions/macros
   4524 
   4525           SSL_CTX_set_msg_callback(ctx, cb)
   4526           SSL_CTX_set_msg_callback_arg(ctx, arg)
   4527           SSL_set_msg_callback(ssl, cb)
   4528           SSL_set_msg_callback_arg(ssl, arg)
   4529 
   4530      to request calling a callback function
   4531 
   4532           void cb(int write_p, int version, int content_type,
   4533                   const void *buf, size_t len, SSL *ssl, void *arg)
   4534 
   4535      whenever a protocol message has been completely received
   4536      (write_p == 0) or sent (write_p == 1).  Here 'version' is the
   4537      protocol version  according to which the SSL library interprets
   4538      the current protocol message (SSL2_VERSION, SSL3_VERSION, or
   4539      TLS1_VERSION).  'content_type' is 0 in the case of SSL 2.0, or
   4540      the content type as defined in the SSL 3.0/TLS 1.0 protocol
   4541      specification (change_cipher_spec(20), alert(21), handshake(22)).
   4542      'buf' and 'len' point to the actual message, 'ssl' to the
   4543      SSL object, and 'arg' is the application-defined value set by
   4544      SSL[_CTX]_set_msg_callback_arg().
   4545 
   4546      'openssl s_client' and 'openssl s_server' have new '-msg' options
   4547      to enable a callback that displays all protocol messages.
   4548      [Bodo Moeller]
   4549 
   4550   *) Change the shared library support so shared libraries are built as
   4551      soon as the corresponding static library is finished, and thereby get
   4552      openssl and the test programs linked against the shared library.
   4553      This still only happens when the keyword "shard" has been given to
   4554      the configuration scripts.
   4555 
   4556      NOTE: shared library support is still an experimental thing, and
   4557      backward binary compatibility is still not guaranteed.
   4558      ["Maciej W. Rozycki" <macro (a] ds2.pg.gda.pl> and Richard Levitte]
   4559 
   4560   *) Add support for Subject Information Access extension.
   4561      [Peter Sylvester <Peter.Sylvester (a] EdelWeb.fr>]
   4562 
   4563   *) Make BUF_MEM_grow() behaviour more consistent: Initialise to zero
   4564      additional bytes when new memory had to be allocated, not just
   4565      when reusing an existing buffer.
   4566      [Bodo Moeller]
   4567 
   4568   *) New command line and configuration option 'utf8' for the req command.
   4569      This allows field values to be specified as UTF8 strings.
   4570      [Steve Henson]
   4571 
   4572   *) Add -multi and -mr options to "openssl speed" - giving multiple parallel
   4573      runs for the former and machine-readable output for the latter.
   4574      [Ben Laurie]
   4575 
   4576   *) Add '-noemailDN' option to 'openssl ca'.  This prevents inclusion
   4577      of the e-mail address in the DN (i.e., it will go into a certificate
   4578      extension only).  The new configuration file option 'email_in_dn = no'
   4579      has the same effect.
   4580      [Massimiliano Pala madwolf (a] openca.org]
   4581 
   4582   *) Change all functions with names starting with des_ to be starting
   4583      with DES_ instead.  Add wrappers that are compatible with libdes,
   4584      but are named _ossl_old_des_*.  Finally, add macros that map the
   4585      des_* symbols to the corresponding _ossl_old_des_* if libdes
   4586      compatibility is desired.  If OpenSSL 0.9.6c compatibility is
   4587      desired, the des_* symbols will be mapped to DES_*, with one
   4588      exception.
   4589 
   4590      Since we provide two compatibility mappings, the user needs to
   4591      define the macro OPENSSL_DES_LIBDES_COMPATIBILITY if libdes
   4592      compatibility is desired.  The default (i.e., when that macro
   4593      isn't defined) is OpenSSL 0.9.6c compatibility.
   4594 
   4595      There are also macros that enable and disable the support of old
   4596      des functions altogether.  Those are OPENSSL_ENABLE_OLD_DES_SUPPORT
   4597      and OPENSSL_DISABLE_OLD_DES_SUPPORT.  If none or both of those
   4598      are defined, the default will apply: to support the old des routines.
   4599 
   4600      In either case, one must include openssl/des.h to get the correct
   4601      definitions.  Do not try to just include openssl/des_old.h, that
   4602      won't work.
   4603 
   4604      NOTE: This is a major break of an old API into a new one.  Software
   4605      authors are encouraged to switch to the DES_ style functions.  Some
   4606      time in the future, des_old.h and the libdes compatibility functions
   4607      will be disable (i.e. OPENSSL_DISABLE_OLD_DES_SUPPORT will be the
   4608      default), and then completely removed.
   4609      [Richard Levitte]
   4610 
   4611   *) Test for certificates which contain unsupported critical extensions.
   4612      If such a certificate is found during a verify operation it is 
   4613      rejected by default: this behaviour can be overridden by either
   4614      handling the new error X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION or
   4615      by setting the verify flag X509_V_FLAG_IGNORE_CRITICAL. A new function
   4616      X509_supported_extension() has also been added which returns 1 if a
   4617      particular extension is supported.
   4618      [Steve Henson]
   4619 
   4620   *) Modify the behaviour of EVP cipher functions in similar way to digests
   4621      to retain compatibility with existing code.
   4622      [Steve Henson]
   4623 
   4624   *) Modify the behaviour of EVP_DigestInit() and EVP_DigestFinal() to retain
   4625      compatibility with existing code. In particular the 'ctx' parameter does
   4626      not have to be to be initialized before the call to EVP_DigestInit() and
   4627      it is tidied up after a call to EVP_DigestFinal(). New function
   4628      EVP_DigestFinal_ex() which does not tidy up the ctx. Similarly function
   4629      EVP_MD_CTX_copy() changed to not require the destination to be
   4630      initialized valid and new function EVP_MD_CTX_copy_ex() added which
   4631      requires the destination to be valid.
   4632 
   4633      Modify all the OpenSSL digest calls to use EVP_DigestInit_ex(),
   4634      EVP_DigestFinal_ex() and EVP_MD_CTX_copy_ex().
   4635      [Steve Henson]
   4636 
   4637   *) Change ssl3_get_message (ssl/s3_both.c) and the functions using it
   4638      so that complete 'Handshake' protocol structures are kept in memory
   4639      instead of overwriting 'msg_type' and 'length' with 'body' data.
   4640      [Bodo Moeller]
   4641 
   4642   *) Add an implementation of SSL_add_dir_cert_subjects_to_stack for Win32.
   4643      [Massimo Santin via Richard Levitte]
   4644 
   4645   *) Major restructuring to the underlying ENGINE code. This includes
   4646      reduction of linker bloat, separation of pure "ENGINE" manipulation
   4647      (initialisation, etc) from functionality dealing with implementations
   4648      of specific crypto iterfaces. This change also introduces integrated
   4649      support for symmetric ciphers and digest implementations - so ENGINEs
   4650      can now accelerate these by providing EVP_CIPHER and EVP_MD
   4651      implementations of their own. This is detailed in crypto/engine/README
   4652      as it couldn't be adequately described here. However, there are a few
   4653      API changes worth noting - some RSA, DSA, DH, and RAND functions that
   4654      were changed in the original introduction of ENGINE code have now
   4655      reverted back - the hooking from this code to ENGINE is now a good
   4656      deal more passive and at run-time, operations deal directly with
   4657      RSA_METHODs, DSA_METHODs (etc) as they did before, rather than
   4658      dereferencing through an ENGINE pointer any more. Also, the ENGINE
   4659      functions dealing with BN_MOD_EXP[_CRT] handlers have been removed -
   4660      they were not being used by the framework as there is no concept of a
   4661      BIGNUM_METHOD and they could not be generalised to the new
   4662      'ENGINE_TABLE' mechanism that underlies the new code. Similarly,
   4663      ENGINE_cpy() has been removed as it cannot be consistently defined in
   4664      the new code.
   4665      [Geoff Thorpe]
   4666 
   4667   *) Change ASN1_GENERALIZEDTIME_check() to allow fractional seconds.
   4668      [Steve Henson]
   4669 
   4670   *) Change mkdef.pl to sort symbols that get the same entry number,
   4671      and make sure the automatically generated functions ERR_load_*
   4672      become part of libeay.num as well.
   4673      [Richard Levitte]
   4674 
   4675   *) New function SSL_renegotiate_pending().  This returns true once
   4676      renegotiation has been requested (either SSL_renegotiate() call
   4677      or HelloRequest/ClientHello receveived from the peer) and becomes
   4678      false once a handshake has been completed.
   4679      (For servers, SSL_renegotiate() followed by SSL_do_handshake()
   4680      sends a HelloRequest, but does not ensure that a handshake takes
   4681      place.  SSL_renegotiate_pending() is useful for checking if the
   4682      client has followed the request.)
   4683      [Bodo Moeller]
   4684 
   4685   *) New SSL option SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION.
   4686      By default, clients may request session resumption even during
   4687      renegotiation (if session ID contexts permit); with this option,
   4688      session resumption is possible only in the first handshake.
   4689 
   4690      SSL_OP_ALL is now 0x00000FFFL instead of 0x000FFFFFL.  This makes
   4691      more bits available for options that should not be part of
   4692      SSL_OP_ALL (such as SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION).
   4693      [Bodo Moeller]
   4694 
   4695   *) Add some demos for certificate and certificate request creation.
   4696      [Steve Henson]
   4697 
   4698   *) Make maximum certificate chain size accepted from the peer application
   4699      settable (SSL*_get/set_max_cert_list()), as proposed by
   4700      "Douglas E. Engert" <deengert (a] anl.gov>.
   4701      [Lutz Jaenicke]
   4702 
   4703   *) Add support for shared libraries for Unixware-7
   4704      (Boyd Lynn Gerber <gerberb (a] zenez.com>).
   4705      [Lutz Jaenicke]
   4706 
   4707   *) Add a "destroy" handler to ENGINEs that allows structural cleanup to
   4708      be done prior to destruction. Use this to unload error strings from
   4709      ENGINEs that load their own error strings. NB: This adds two new API
   4710      functions to "get" and "set" this destroy handler in an ENGINE.
   4711      [Geoff Thorpe]
   4712 
   4713   *) Alter all existing ENGINE implementations (except "openssl" and
   4714      "openbsd") to dynamically instantiate their own error strings. This
   4715      makes them more flexible to be built both as statically-linked ENGINEs
   4716      and self-contained shared-libraries loadable via the "dynamic" ENGINE.
   4717      Also, add stub code to each that makes building them as self-contained
   4718      shared-libraries easier (see README.ENGINE).
   4719      [Geoff Thorpe]
   4720 
   4721   *) Add a "dynamic" ENGINE that provides a mechanism for binding ENGINE
   4722      implementations into applications that are completely implemented in
   4723      self-contained shared-libraries. The "dynamic" ENGINE exposes control
   4724      commands that can be used to configure what shared-library to load and
   4725      to control aspects of the way it is handled. Also, made an update to
   4726      the README.ENGINE file that brings its information up-to-date and
   4727      provides some information and instructions on the "dynamic" ENGINE
   4728      (ie. how to use it, how to build "dynamic"-loadable ENGINEs, etc).
   4729      [Geoff Thorpe]
   4730 
   4731   *) Make it possible to unload ranges of ERR strings with a new
   4732      "ERR_unload_strings" function.
   4733      [Geoff Thorpe]
   4734 
   4735   *) Add a copy() function to EVP_MD.
   4736      [Ben Laurie]
   4737 
   4738   *) Make EVP_MD routines take a context pointer instead of just the
   4739      md_data void pointer.
   4740      [Ben Laurie]
   4741 
   4742   *) Add flags to EVP_MD and EVP_MD_CTX. EVP_MD_FLAG_ONESHOT indicates
   4743      that the digest can only process a single chunk of data
   4744      (typically because it is provided by a piece of
   4745      hardware). EVP_MD_CTX_FLAG_ONESHOT indicates that the application
   4746      is only going to provide a single chunk of data, and hence the
   4747      framework needn't accumulate the data for oneshot drivers.
   4748      [Ben Laurie]
   4749 
   4750   *) As with "ERR", make it possible to replace the underlying "ex_data"
   4751      functions. This change also alters the storage and management of global
   4752      ex_data state - it's now all inside ex_data.c and all "class" code (eg.
   4753      RSA, BIO, SSL_CTX, etc) no longer stores its own STACKS and per-class
   4754      index counters. The API functions that use this state have been changed
   4755      to take a "class_index" rather than pointers to the class's local STACK
   4756      and counter, and there is now an API function to dynamically create new
   4757      classes. This centralisation allows us to (a) plug a lot of the
   4758      thread-safety problems that existed, and (b) makes it possible to clean
   4759      up all allocated state using "CRYPTO_cleanup_all_ex_data()". W.r.t. (b)
   4760      such data would previously have always leaked in application code and
   4761      workarounds were in place to make the memory debugging turn a blind eye
   4762      to it. Application code that doesn't use this new function will still
   4763      leak as before, but their memory debugging output will announce it now
   4764      rather than letting it slide.
   4765 
   4766      Besides the addition of CRYPTO_cleanup_all_ex_data(), another API change
   4767      induced by the "ex_data" overhaul is that X509_STORE_CTX_init() now
   4768      has a return value to indicate success or failure.
   4769      [Geoff Thorpe]
   4770 
   4771   *) Make it possible to replace the underlying "ERR" functions such that the
   4772      global state (2 LHASH tables and 2 locks) is only used by the "default"
   4773      implementation. This change also adds two functions to "get" and "set"
   4774      the implementation prior to it being automatically set the first time
   4775      any other ERR function takes place. Ie. an application can call "get",
   4776      pass the return value to a module it has just loaded, and that module
   4777      can call its own "set" function using that value. This means the
   4778      module's "ERR" operations will use (and modify) the error state in the
   4779      application and not in its own statically linked copy of OpenSSL code.
   4780      [Geoff Thorpe]
   4781 
   4782   *) Give DH, DSA, and RSA types their own "**_up_ref()" function to increment
   4783      reference counts. This performs normal REF_PRINT/REF_CHECK macros on
   4784      the operation, and provides a more encapsulated way for external code
   4785      (crypto/evp/ and ssl/) to do this. Also changed the evp and ssl code
   4786      to use these functions rather than manually incrementing the counts.
   4787 
   4788      Also rename "DSO_up()" function to more descriptive "DSO_up_ref()".
   4789      [Geoff Thorpe]
   4790 
   4791   *) Add EVP test program.
   4792      [Ben Laurie]
   4793 
   4794   *) Add symmetric cipher support to ENGINE. Expect the API to change!
   4795      [Ben Laurie]
   4796 
   4797   *) New CRL functions: X509_CRL_set_version(), X509_CRL_set_issuer_name()
   4798      X509_CRL_set_lastUpdate(), X509_CRL_set_nextUpdate(), X509_CRL_sort(),
   4799      X509_REVOKED_set_serialNumber(), and X509_REVOKED_set_revocationDate().
   4800      These allow a CRL to be built without having to access X509_CRL fields
   4801      directly. Modify 'ca' application to use new functions.
   4802      [Steve Henson]
   4803 
   4804   *) Move SSL_OP_TLS_ROLLBACK_BUG out of the SSL_OP_ALL list of recommended
   4805      bug workarounds. Rollback attack detection is a security feature.
   4806      The problem will only arise on OpenSSL servers when TLSv1 is not
   4807      available (sslv3_server_method() or SSL_OP_NO_TLSv1).
   4808      Software authors not wanting to support TLSv1 will have special reasons
   4809      for their choice and can explicitly enable this option.
   4810      [Bodo Moeller, Lutz Jaenicke]
   4811 
   4812   *) Rationalise EVP so it can be extended: don't include a union of
   4813      cipher/digest structures, add init/cleanup functions for EVP_MD_CTX
   4814      (similar to those existing for EVP_CIPHER_CTX).
   4815      Usage example:
   4816 
   4817          EVP_MD_CTX md;
   4818 
   4819          EVP_MD_CTX_init(&md);             /* new function call */
   4820          EVP_DigestInit(&md, EVP_sha1());
   4821          EVP_DigestUpdate(&md, in, len);
   4822          EVP_DigestFinal(&md, out, NULL);
   4823          EVP_MD_CTX_cleanup(&md);          /* new function call */
   4824 
   4825      [Ben Laurie]
   4826 
   4827   *) Make DES key schedule conform to the usual scheme, as well as
   4828      correcting its structure. This means that calls to DES functions
   4829      now have to pass a pointer to a des_key_schedule instead of a
   4830      plain des_key_schedule (which was actually always a pointer
   4831      anyway): E.g.,
   4832 
   4833          des_key_schedule ks;
   4834 
   4835 	 des_set_key_checked(..., &ks);
   4836 	 des_ncbc_encrypt(..., &ks, ...);
   4837 
   4838      (Note that a later change renames 'des_...' into 'DES_...'.)
   4839      [Ben Laurie]
   4840 
   4841   *) Initial reduction of linker bloat: the use of some functions, such as
   4842      PEM causes large amounts of unused functions to be linked in due to
   4843      poor organisation. For example pem_all.c contains every PEM function
   4844      which has a knock on effect of linking in large amounts of (unused)
   4845      ASN1 code. Grouping together similar functions and splitting unrelated
   4846      functions prevents this.
   4847      [Steve Henson]
   4848 
   4849   *) Cleanup of EVP macros.
   4850      [Ben Laurie]
   4851 
   4852   *) Change historical references to {NID,SN,LN}_des_ede and ede3 to add the
   4853      correct _ecb suffix.
   4854      [Ben Laurie]
   4855 
   4856   *) Add initial OCSP responder support to ocsp application. The
   4857      revocation information is handled using the text based index
   4858      use by the ca application. The responder can either handle
   4859      requests generated internally, supplied in files (for example
   4860      via a CGI script) or using an internal minimal server.
   4861      [Steve Henson]
   4862 
   4863   *) Add configuration choices to get zlib compression for TLS.
   4864      [Richard Levitte]
   4865 
   4866   *) Changes to Kerberos SSL for RFC 2712 compliance:
   4867      1.  Implemented real KerberosWrapper, instead of just using
   4868          KRB5 AP_REQ message.  [Thanks to Simon Wilkinson <sxw (a] sxw.org.uk>]
   4869      2.  Implemented optional authenticator field of KerberosWrapper.
   4870 
   4871      Added openssl-style ASN.1 macros for Kerberos ticket, ap_req,
   4872      and authenticator structs; see crypto/krb5/.
   4873 
   4874      Generalized Kerberos calls to support multiple Kerberos libraries.
   4875      [Vern Staats <staatsvr (a] asc.hpc.mil>,
   4876       Jeffrey Altman <jaltman (a] columbia.edu>
   4877       via Richard Levitte]
   4878 
   4879   *) Cause 'openssl speed' to use fully hard-coded DSA keys as it
   4880      already does with RSA. testdsa.h now has 'priv_key/pub_key'
   4881      values for each of the key sizes rather than having just
   4882      parameters (and 'speed' generating keys each time).
   4883      [Geoff Thorpe]
   4884 
   4885   *) Speed up EVP routines.
   4886      Before:
   4887 encrypt
   4888 type              8 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
   4889 des-cbc           4408.85k     5560.51k     5778.46k     5862.20k     5825.16k
   4890 des-cbc           4389.55k     5571.17k     5792.23k     5846.91k     5832.11k
   4891 des-cbc           4394.32k     5575.92k     5807.44k     5848.37k     5841.30k
   4892 decrypt
   4893 des-cbc           3482.66k     5069.49k     5496.39k     5614.16k     5639.28k
   4894 des-cbc           3480.74k     5068.76k     5510.34k     5609.87k     5635.52k
   4895 des-cbc           3483.72k     5067.62k     5504.60k     5708.01k     5724.80k
   4896      After:
   4897 encrypt
   4898 des-cbc           4660.16k     5650.19k     5807.19k     5827.13k     5783.32k
   4899 decrypt
   4900 des-cbc           3624.96k     5258.21k     5530.91k     5624.30k     5628.26k
   4901      [Ben Laurie]
   4902 
   4903   *) Added the OS2-EMX target.
   4904      ["Brian Havard" <brianh (a] kheldar.apana.org.au> and Richard Levitte]
   4905 
   4906   *) Rewrite apps to use NCONF routines instead of the old CONF. New functions
   4907      to support NCONF routines in extension code. New function CONF_set_nconf()
   4908      to allow functions which take an NCONF to also handle the old LHASH
   4909      structure: this means that the old CONF compatible routines can be
   4910      retained (in particular wrt extensions) without having to duplicate the
   4911      code. New function X509V3_add_ext_nconf_sk to add extensions to a stack.
   4912      [Steve Henson]
   4913 
   4914   *) Enhance the general user interface with mechanisms for inner control
   4915      and with possibilities to have yes/no kind of prompts.
   4916      [Richard Levitte]
   4917 
   4918   *) Change all calls to low level digest routines in the library and
   4919      applications to use EVP. Add missing calls to HMAC_cleanup() and
   4920      don't assume HMAC_CTX can be copied using memcpy().
   4921      [Verdon Walker <VWalker (a] novell.com>, Steve Henson]
   4922 
   4923   *) Add the possibility to control engines through control names but with
   4924      arbitrary arguments instead of just a string.
   4925      Change the key loaders to take a UI_METHOD instead of a callback
   4926      function pointer.  NOTE: this breaks binary compatibility with earlier
   4927      versions of OpenSSL [engine].
   4928      Adapt the nCipher code for these new conditions and add a card insertion
   4929      callback.
   4930      [Richard Levitte]
   4931 
   4932   *) Enhance the general user interface with mechanisms to better support
   4933      dialog box interfaces, application-defined prompts, the possibility
   4934      to use defaults (for example default passwords from somewhere else)
   4935      and interrupts/cancellations.
   4936      [Richard Levitte]
   4937 
   4938   *) Tidy up PKCS#12 attribute handling. Add support for the CSP name
   4939      attribute in PKCS#12 files, add new -CSP option to pkcs12 utility.
   4940      [Steve Henson]
   4941 
   4942   *) Fix a memory leak in 'sk_dup()' in the case reallocation fails. (Also
   4943      tidy up some unnecessarily weird code in 'sk_new()').
   4944      [Geoff, reported by Diego Tartara <dtartara (a] novamens.com>]
   4945 
   4946   *) Change the key loading routines for ENGINEs to use the same kind
   4947      callback (pem_password_cb) as all other routines that need this
   4948      kind of callback.
   4949      [Richard Levitte]
   4950 
   4951   *) Increase ENTROPY_NEEDED to 32 bytes, as Rijndael can operate with
   4952      256 bit (=32 byte) keys. Of course seeding with more entropy bytes
   4953      than this minimum value is recommended.
   4954      [Lutz Jaenicke]
   4955 
   4956   *) New random seeder for OpenVMS, using the system process statistics
   4957      that are easily reachable.
   4958      [Richard Levitte]
   4959 
   4960   *) Windows apparently can't transparently handle global
   4961      variables defined in DLLs. Initialisations such as:
   4962 
   4963         const ASN1_ITEM *it = &ASN1_INTEGER_it;
   4964 
   4965      wont compile. This is used by the any applications that need to
   4966      declare their own ASN1 modules. This was fixed by adding the option
   4967      EXPORT_VAR_AS_FN to all Win32 platforms, although this isn't strictly
   4968      needed for static libraries under Win32.
   4969      [Steve Henson]
   4970 
   4971   *) New functions X509_PURPOSE_set() and X509_TRUST_set() to handle
   4972      setting of purpose and trust fields. New X509_STORE trust and
   4973      purpose functions and tidy up setting in other SSL functions.
   4974      [Steve Henson]
   4975 
   4976   *) Add copies of X509_STORE_CTX fields and callbacks to X509_STORE
   4977      structure. These are inherited by X509_STORE_CTX when it is 
   4978      initialised. This allows various defaults to be set in the
   4979      X509_STORE structure (such as flags for CRL checking and custom
   4980      purpose or trust settings) for functions which only use X509_STORE_CTX
   4981      internally such as S/MIME.
   4982 
   4983      Modify X509_STORE_CTX_purpose_inherit() so it only sets purposes and
   4984      trust settings if they are not set in X509_STORE. This allows X509_STORE
   4985      purposes and trust (in S/MIME for example) to override any set by default.
   4986 
   4987      Add command line options for CRL checking to smime, s_client and s_server
   4988      applications.
   4989      [Steve Henson]
   4990 
   4991   *) Initial CRL based revocation checking. If the CRL checking flag(s)
   4992      are set then the CRL is looked up in the X509_STORE structure and
   4993      its validity and signature checked, then if the certificate is found
   4994      in the CRL the verify fails with a revoked error.
   4995 
   4996      Various new CRL related callbacks added to X509_STORE_CTX structure.
   4997 
   4998      Command line options added to 'verify' application to support this.
   4999 
   5000      This needs some additional work, such as being able to handle multiple
   5001      CRLs with different times, extension based lookup (rather than just
   5002      by subject name) and ultimately more complete V2 CRL extension
   5003      handling.
   5004      [Steve Henson]
   5005 
   5006   *) Add a general user interface API (crypto/ui/).  This is designed
   5007      to replace things like des_read_password and friends (backward
   5008      compatibility functions using this new API are provided).
   5009      The purpose is to remove prompting functions from the DES code
   5010      section as well as provide for prompting through dialog boxes in
   5011      a window system and the like.
   5012      [Richard Levitte]
   5013 
   5014   *) Add "ex_data" support to ENGINE so implementations can add state at a
   5015      per-structure level rather than having to store it globally.
   5016      [Geoff]
   5017 
   5018   *) Make it possible for ENGINE structures to be copied when retrieved by
   5019      ENGINE_by_id() if the ENGINE specifies a new flag: ENGINE_FLAGS_BY_ID_COPY.
   5020      This causes the "original" ENGINE structure to act like a template,
   5021      analogous to the RSA vs. RSA_METHOD type of separation. Because of this
   5022      operational state can be localised to each ENGINE structure, despite the
   5023      fact they all share the same "methods". New ENGINE structures returned in
   5024      this case have no functional references and the return value is the single
   5025      structural reference. This matches the single structural reference returned
   5026      by ENGINE_by_id() normally, when it is incremented on the pre-existing
   5027      ENGINE structure.
   5028      [Geoff]
   5029 
   5030   *) Fix ASN1 decoder when decoding type ANY and V_ASN1_OTHER: since this
   5031      needs to match any other type at all we need to manually clear the
   5032      tag cache.
   5033      [Steve Henson]
   5034 
   5035   *) Changes to the "openssl engine" utility to include;
   5036      - verbosity levels ('-v', '-vv', and '-vvv') that provide information
   5037        about an ENGINE's available control commands.
   5038      - executing control commands from command line arguments using the
   5039        '-pre' and '-post' switches. '-post' is only used if '-t' is
   5040        specified and the ENGINE is successfully initialised. The syntax for
   5041        the individual commands are colon-separated, for example;
   5042 	 openssl engine chil -pre FORK_CHECK:0 -pre SO_PATH:/lib/test.so
   5043      [Geoff]
   5044 
   5045   *) New dynamic control command support for ENGINEs. ENGINEs can now
   5046      declare their own commands (numbers), names (strings), descriptions,
   5047      and input types for run-time discovery by calling applications. A
   5048      subset of these commands are implicitly classed as "executable"
   5049      depending on their input type, and only these can be invoked through
   5050      the new string-based API function ENGINE_ctrl_cmd_string(). (Eg. this
   5051      can be based on user input, config files, etc). The distinction is
   5052      that "executable" commands cannot return anything other than a boolean
   5053      result and can only support numeric or string input, whereas some
   5054      discoverable commands may only be for direct use through
   5055      ENGINE_ctrl(), eg. supporting the exchange of binary data, function
   5056      pointers, or other custom uses. The "executable" commands are to
   5057      support parameterisations of ENGINE behaviour that can be
   5058      unambiguously defined by ENGINEs and used consistently across any
   5059      OpenSSL-based application. Commands have been added to all the
   5060      existing hardware-supporting ENGINEs, noticeably "SO_PATH" to allow
   5061      control over shared-library paths without source code alterations.
   5062      [Geoff]
   5063 
   5064   *) Changed all ENGINE implementations to dynamically allocate their
   5065      ENGINEs rather than declaring them statically. Apart from this being
   5066      necessary with the removal of the ENGINE_FLAGS_MALLOCED distinction,
   5067      this also allows the implementations to compile without using the
   5068      internal engine_int.h header.
   5069      [Geoff]
   5070 
   5071   *) Minor adjustment to "rand" code. RAND_get_rand_method() now returns a
   5072      'const' value. Any code that should be able to modify a RAND_METHOD
   5073      should already have non-const pointers to it (ie. they should only
   5074      modify their own ones).
   5075      [Geoff]
   5076 
   5077   *) Made a variety of little tweaks to the ENGINE code.
   5078      - "atalla" and "ubsec" string definitions were moved from header files
   5079        to C code. "nuron" string definitions were placed in variables
   5080        rather than hard-coded - allowing parameterisation of these values
   5081        later on via ctrl() commands.
   5082      - Removed unused "#if 0"'d code.
   5083      - Fixed engine list iteration code so it uses ENGINE_free() to release
   5084        structural references.
   5085      - Constified the RAND_METHOD element of ENGINE structures.
   5086      - Constified various get/set functions as appropriate and added
   5087        missing functions (including a catch-all ENGINE_cpy that duplicates
   5088        all ENGINE values onto a new ENGINE except reference counts/state).
   5089      - Removed NULL parameter checks in get/set functions. Setting a method
   5090        or function to NULL is a way of cancelling out a previously set
   5091        value.  Passing a NULL ENGINE parameter is just plain stupid anyway
   5092        and doesn't justify the extra error symbols and code.
   5093      - Deprecate the ENGINE_FLAGS_MALLOCED define and move the area for
   5094        flags from engine_int.h to engine.h.
   5095      - Changed prototypes for ENGINE handler functions (init(), finish(),
   5096        ctrl(), key-load functions, etc) to take an (ENGINE*) parameter.
   5097      [Geoff]
   5098 
   5099   *) Implement binary inversion algorithm for BN_mod_inverse in addition
   5100      to the algorithm using long division.  The binary algorithm can be
   5101      used only if the modulus is odd.  On 32-bit systems, it is faster
   5102      only for relatively small moduli (roughly 20-30% for 128-bit moduli,
   5103      roughly 5-15% for 256-bit moduli), so we use it only for moduli
   5104      up to 450 bits.  In 64-bit environments, the binary algorithm
   5105      appears to be advantageous for much longer moduli; here we use it
   5106      for moduli up to 2048 bits.
   5107      [Bodo Moeller]
   5108 
   5109   *) Rewrite CHOICE field setting in ASN1_item_ex_d2i(). The old code
   5110      could not support the combine flag in choice fields.
   5111      [Steve Henson]
   5112 
   5113   *) Add a 'copy_extensions' option to the 'ca' utility. This copies
   5114      extensions from a certificate request to the certificate.
   5115      [Steve Henson]
   5116 
   5117   *) Allow multiple 'certopt' and 'nameopt' options to be separated
   5118      by commas. Add 'namopt' and 'certopt' options to the 'ca' config
   5119      file: this allows the display of the certificate about to be
   5120      signed to be customised, to allow certain fields to be included
   5121      or excluded and extension details. The old system didn't display
   5122      multicharacter strings properly, omitted fields not in the policy
   5123      and couldn't display additional details such as extensions.
   5124      [Steve Henson]
   5125 
   5126   *) Function EC_POINTs_mul for multiple scalar multiplication
   5127      of an arbitrary number of elliptic curve points
   5128           \sum scalars[i]*points[i],
   5129      optionally including the generator defined for the EC_GROUP:
   5130           scalar*generator +  \sum scalars[i]*points[i].
   5131 
   5132      EC_POINT_mul is a simple wrapper function for the typical case
   5133      that the point list has just one item (besides the optional
   5134      generator).
   5135      [Bodo Moeller]
   5136 
   5137   *) First EC_METHODs for curves over GF(p):
   5138 
   5139      EC_GFp_simple_method() uses the basic BN_mod_mul and BN_mod_sqr
   5140      operations and provides various method functions that can also
   5141      operate with faster implementations of modular arithmetic.     
   5142 
   5143      EC_GFp_mont_method() reuses most functions that are part of
   5144      EC_GFp_simple_method, but uses Montgomery arithmetic.
   5145 
   5146      [Bodo Moeller; point addition and point doubling
   5147      implementation directly derived from source code provided by
   5148      Lenka Fibikova <fibikova (a] exp-math.uni-essen.de>]
   5149 
   5150   *) Framework for elliptic curves (crypto/ec/ec.h, crypto/ec/ec_lcl.h,
   5151      crypto/ec/ec_lib.c):
   5152 
   5153      Curves are EC_GROUP objects (with an optional group generator)
   5154      based on EC_METHODs that are built into the library.
   5155 
   5156      Points are EC_POINT objects based on EC_GROUP objects.
   5157 
   5158      Most of the framework would be able to handle curves over arbitrary
   5159      finite fields, but as there are no obvious types for fields other
   5160      than GF(p), some functions are limited to that for now.
   5161      [Bodo Moeller]
   5162 
   5163   *) Add the -HTTP option to s_server.  It is similar to -WWW, but requires
   5164      that the file contains a complete HTTP response.
   5165      [Richard Levitte]
   5166 
   5167   *) Add the ec directory to mkdef.pl and mkfiles.pl. In mkdef.pl
   5168      change the def and num file printf format specifier from "%-40sXXX"
   5169      to "%-39s XXX". The latter will always guarantee a space after the
   5170      field while the former will cause them to run together if the field
   5171      is 40 of more characters long.
   5172      [Steve Henson]
   5173 
   5174   *) Constify the cipher and digest 'method' functions and structures
   5175      and modify related functions to take constant EVP_MD and EVP_CIPHER
   5176      pointers.
   5177      [Steve Henson]
   5178 
   5179   *) Hide BN_CTX structure details in bn_lcl.h instead of publishing them
   5180      in <openssl/bn.h>.  Also further increase BN_CTX_NUM to 32.
   5181      [Bodo Moeller]
   5182 
   5183   *) Modify EVP_Digest*() routines so they now return values. Although the
   5184      internal software routines can never fail additional hardware versions
   5185      might.
   5186      [Steve Henson]
   5187 
   5188   *) Clean up crypto/err/err.h and change some error codes to avoid conflicts:
   5189 
   5190      Previously ERR_R_FATAL was too small and coincided with ERR_LIB_PKCS7
   5191      (= ERR_R_PKCS7_LIB); it is now 64 instead of 32.
   5192 
   5193      ASN1 error codes
   5194           ERR_R_NESTED_ASN1_ERROR
   5195           ...
   5196           ERR_R_MISSING_ASN1_EOS
   5197      were 4 .. 9, conflicting with
   5198           ERR_LIB_RSA (= ERR_R_RSA_LIB)
   5199           ...
   5200           ERR_LIB_PEM (= ERR_R_PEM_LIB).
   5201      They are now 58 .. 63 (i.e., just below ERR_R_FATAL).
   5202 
   5203      Add new error code 'ERR_R_INTERNAL_ERROR'.
   5204      [Bodo Moeller]
   5205 
   5206   *) Don't overuse locks in crypto/err/err.c: For data retrieval, CRYPTO_r_lock
   5207      suffices.
   5208      [Bodo Moeller]
   5209 
   5210   *) New option '-subj arg' for 'openssl req' and 'openssl ca'.  This
   5211      sets the subject name for a new request or supersedes the
   5212      subject name in a given request. Formats that can be parsed are
   5213           'CN=Some Name, OU=myOU, C=IT'
   5214      and
   5215           'CN=Some Name/OU=myOU/C=IT'.
   5216 
   5217      Add options '-batch' and '-verbose' to 'openssl req'.
   5218      [Massimiliano Pala <madwolf (a] hackmasters.net>]
   5219 
   5220   *) Introduce the possibility to access global variables through
   5221      functions on platform were that's the best way to handle exporting
   5222      global variables in shared libraries.  To enable this functionality,
   5223      one must configure with "EXPORT_VAR_AS_FN" or defined the C macro
   5224      "OPENSSL_EXPORT_VAR_AS_FUNCTION" in crypto/opensslconf.h (the latter
   5225      is normally done by Configure or something similar).
   5226 
   5227      To implement a global variable, use the macro OPENSSL_IMPLEMENT_GLOBAL
   5228      in the source file (foo.c) like this:
   5229 
   5230 	OPENSSL_IMPLEMENT_GLOBAL(int,foo)=1;
   5231 	OPENSSL_IMPLEMENT_GLOBAL(double,bar);
   5232 
   5233      To declare a global variable, use the macros OPENSSL_DECLARE_GLOBAL
   5234      and OPENSSL_GLOBAL_REF in the header file (foo.h) like this:
   5235 
   5236 	OPENSSL_DECLARE_GLOBAL(int,foo);
   5237 	#define foo OPENSSL_GLOBAL_REF(foo)
   5238 	OPENSSL_DECLARE_GLOBAL(double,bar);
   5239 	#define bar OPENSSL_GLOBAL_REF(bar)
   5240 
   5241      The #defines are very important, and therefore so is including the
   5242      header file everywhere where the defined globals are used.
   5243 
   5244      The macro OPENSSL_EXPORT_VAR_AS_FUNCTION also affects the definition
   5245      of ASN.1 items, but that structure is a bit different.
   5246 
   5247      The largest change is in util/mkdef.pl which has been enhanced with
   5248      better and easier to understand logic to choose which symbols should
   5249      go into the Windows .def files as well as a number of fixes and code
   5250      cleanup (among others, algorithm keywords are now sorted
   5251      lexicographically to avoid constant rewrites).
   5252      [Richard Levitte]
   5253 
   5254   *) In BN_div() keep a copy of the sign of 'num' before writing the
   5255      result to 'rm' because if rm==num the value will be overwritten
   5256      and produce the wrong result if 'num' is negative: this caused
   5257      problems with BN_mod() and BN_nnmod().
   5258      [Steve Henson]
   5259 
   5260   *) Function OCSP_request_verify(). This checks the signature on an
   5261      OCSP request and verifies the signer certificate. The signer
   5262      certificate is just checked for a generic purpose and OCSP request
   5263      trust settings.
   5264      [Steve Henson]
   5265 
   5266   *) Add OCSP_check_validity() function to check the validity of OCSP
   5267      responses. OCSP responses are prepared in real time and may only
   5268      be a few seconds old. Simply checking that the current time lies
   5269      between thisUpdate and nextUpdate max reject otherwise valid responses
   5270      caused by either OCSP responder or client clock inaccuracy. Instead
   5271      we allow thisUpdate and nextUpdate to fall within a certain period of
   5272      the current time. The age of the response can also optionally be
   5273      checked. Two new options -validity_period and -status_age added to
   5274      ocsp utility.
   5275      [Steve Henson]
   5276 
   5277   *) If signature or public key algorithm is unrecognized print out its
   5278      OID rather that just UNKNOWN.
   5279      [Steve Henson]
   5280 
   5281   *) Change OCSP_cert_to_id() to tolerate a NULL subject certificate and
   5282      OCSP_cert_id_new() a NULL serialNumber. This allows a partial certificate
   5283      ID to be generated from the issuer certificate alone which can then be
   5284      passed to OCSP_id_issuer_cmp().
   5285      [Steve Henson]
   5286 
   5287   *) New compilation option ASN1_ITEM_FUNCTIONS. This causes the new
   5288      ASN1 modules to export functions returning ASN1_ITEM pointers
   5289      instead of the ASN1_ITEM structures themselves. This adds several
   5290      new macros which allow the underlying ASN1 function/structure to
   5291      be accessed transparently. As a result code should not use ASN1_ITEM
   5292      references directly (such as &X509_it) but instead use the relevant
   5293      macros (such as ASN1_ITEM_rptr(X509)). This option is to allow
   5294      use of the new ASN1 code on platforms where exporting structures
   5295      is problematical (for example in shared libraries) but exporting
   5296      functions returning pointers to structures is not.
   5297      [Steve Henson]
   5298 
   5299   *) Add support for overriding the generation of SSL/TLS session IDs.
   5300      These callbacks can be registered either in an SSL_CTX or per SSL.
   5301      The purpose of this is to allow applications to control, if they wish,
   5302      the arbitrary values chosen for use as session IDs, particularly as it
   5303      can be useful for session caching in multiple-server environments. A
   5304      command-line switch for testing this (and any client code that wishes
   5305      to use such a feature) has been added to "s_server".
   5306      [Geoff Thorpe, Lutz Jaenicke]
   5307 
   5308   *) Modify mkdef.pl to recognise and parse preprocessor conditionals
   5309      of the form '#if defined(...) || defined(...) || ...' and
   5310      '#if !defined(...) && !defined(...) && ...'.  This also avoids
   5311      the growing number of special cases it was previously handling.
   5312      [Richard Levitte]
   5313 
   5314   *) Make all configuration macros available for application by making
   5315      sure they are available in opensslconf.h, by giving them names starting
   5316      with "OPENSSL_" to avoid conflicts with other packages and by making
   5317      sure e_os2.h will cover all platform-specific cases together with
   5318      opensslconf.h.
   5319      Additionally, it is now possible to define configuration/platform-
   5320      specific names (called "system identities").  In the C code, these
   5321      are prefixed with "OPENSSL_SYSNAME_".  e_os2.h will create another
   5322      macro with the name beginning with "OPENSSL_SYS_", which is determined
   5323      from "OPENSSL_SYSNAME_*" or compiler-specific macros depending on
   5324      what is available.
   5325      [Richard Levitte]
   5326 
   5327   *) New option -set_serial to 'req' and 'x509' this allows the serial
   5328      number to use to be specified on the command line. Previously self
   5329      signed certificates were hard coded with serial number 0 and the 
   5330      CA options of 'x509' had to use a serial number in a file which was
   5331      auto incremented.
   5332      [Steve Henson]
   5333 
   5334   *) New options to 'ca' utility to support V2 CRL entry extensions.
   5335      Currently CRL reason, invalidity date and hold instruction are
   5336      supported. Add new CRL extensions to V3 code and some new objects.
   5337      [Steve Henson]
   5338 
   5339   *) New function EVP_CIPHER_CTX_set_padding() this is used to
   5340      disable standard block padding (aka PKCS#5 padding) in the EVP
   5341      API, which was previously mandatory. This means that the data is
   5342      not padded in any way and so the total length much be a multiple
   5343      of the block size, otherwise an error occurs.
   5344      [Steve Henson]
   5345 
   5346   *) Initial (incomplete) OCSP SSL support.
   5347      [Steve Henson]
   5348 
   5349   *) New function OCSP_parse_url(). This splits up a URL into its host,
   5350      port and path components: primarily to parse OCSP URLs. New -url
   5351      option to ocsp utility.
   5352      [Steve Henson]
   5353 
   5354   *) New nonce behavior. The return value of OCSP_check_nonce() now 
   5355      reflects the various checks performed. Applications can decide
   5356      whether to tolerate certain situations such as an absent nonce
   5357      in a response when one was present in a request: the ocsp application
   5358      just prints out a warning. New function OCSP_add1_basic_nonce()
   5359      this is to allow responders to include a nonce in a response even if
   5360      the request is nonce-less.
   5361      [Steve Henson]
   5362 
   5363   *) Disable stdin buffering in load_cert (apps/apps.c) so that no certs are
   5364      skipped when using openssl x509 multiple times on a single input file,
   5365      e.g. "(openssl x509 -out cert1; openssl x509 -out cert2) <certs".
   5366      [Bodo Moeller]
   5367 
   5368   *) Make ASN1_UTCTIME_set_string() and ASN1_GENERALIZEDTIME_set_string()
   5369      set string type: to handle setting ASN1_TIME structures. Fix ca
   5370      utility to correctly initialize revocation date of CRLs.
   5371      [Steve Henson]
   5372 
   5373   *) New option SSL_OP_CIPHER_SERVER_PREFERENCE allows the server to override
   5374      the clients preferred ciphersuites and rather use its own preferences.
   5375      Should help to work around M$ SGC (Server Gated Cryptography) bug in
   5376      Internet Explorer by ensuring unchanged hash method during stepup.
   5377      (Also replaces the broken/deactivated SSL_OP_NON_EXPORT_FIRST option.)
   5378      [Lutz Jaenicke]
   5379 
   5380   *) Make mkdef.pl recognise all DECLARE_ASN1 macros, change rijndael
   5381      to aes and add a new 'exist' option to print out symbols that don't
   5382      appear to exist.
   5383      [Steve Henson]
   5384 
   5385   *) Additional options to ocsp utility to allow flags to be set and
   5386      additional certificates supplied.
   5387      [Steve Henson]
   5388 
   5389   *) Add the option -VAfile to 'openssl ocsp', so the user can give the
   5390      OCSP client a number of certificate to only verify the response
   5391      signature against.
   5392      [Richard Levitte]
   5393 
   5394   *) Update Rijndael code to version 3.0 and change EVP AES ciphers to
   5395      handle the new API. Currently only ECB, CBC modes supported. Add new
   5396      AES OIDs.
   5397 
   5398      Add TLS AES ciphersuites as described in RFC3268, "Advanced
   5399      Encryption Standard (AES) Ciphersuites for Transport Layer
   5400      Security (TLS)".  (In beta versions of OpenSSL 0.9.7, these were
   5401      not enabled by default and were not part of the "ALL" ciphersuite
   5402      alias because they were not yet official; they could be
   5403      explicitly requested by specifying the "AESdraft" ciphersuite
   5404      group alias.  In the final release of OpenSSL 0.9.7, the group
   5405      alias is called "AES" and is part of "ALL".)
   5406      [Ben Laurie, Steve  Henson, Bodo Moeller]
   5407 
   5408   *) New function OCSP_copy_nonce() to copy nonce value (if present) from
   5409      request to response.
   5410      [Steve Henson]
   5411 
   5412   *) Functions for OCSP responders. OCSP_request_onereq_count(),
   5413      OCSP_request_onereq_get0(), OCSP_onereq_get0_id() and OCSP_id_get0_info()
   5414      extract information from a certificate request. OCSP_response_create()
   5415      creates a response and optionally adds a basic response structure.
   5416      OCSP_basic_add1_status() adds a complete single response to a basic
   5417      response and returns the OCSP_SINGLERESP structure just added (to allow
   5418      extensions to be included for example). OCSP_basic_add1_cert() adds a
   5419      certificate to a basic response and OCSP_basic_sign() signs a basic
   5420      response with various flags. New helper functions ASN1_TIME_check()
   5421      (checks validity of ASN1_TIME structure) and ASN1_TIME_to_generalizedtime()
   5422      (converts ASN1_TIME to GeneralizedTime).
   5423      [Steve Henson]
   5424 
   5425   *) Various new functions. EVP_Digest() combines EVP_Digest{Init,Update,Final}()
   5426      in a single operation. X509_get0_pubkey_bitstr() extracts the public_key
   5427      structure from a certificate. X509_pubkey_digest() digests the public_key
   5428      contents: this is used in various key identifiers. 
   5429      [Steve Henson]
   5430 
   5431   *) Make sk_sort() tolerate a NULL argument.
   5432      [Steve Henson reported by Massimiliano Pala <madwolf (a] comune.modena.it>]
   5433 
   5434   *) New OCSP verify flag OCSP_TRUSTOTHER. When set the "other" certificates
   5435      passed by the function are trusted implicitly. If any of them signed the
   5436      response then it is assumed to be valid and is not verified.
   5437      [Steve Henson]
   5438 
   5439   *) In PKCS7_set_type() initialise content_type in PKCS7_ENC_CONTENT
   5440      to data. This was previously part of the PKCS7 ASN1 code. This
   5441      was causing problems with OpenSSL created PKCS#12 and PKCS#7 structures.
   5442      [Steve Henson, reported by Kenneth R. Robinette
   5443 				<support (a] securenetterm.com>]
   5444 
   5445   *) Add CRYPTO_push_info() and CRYPTO_pop_info() calls to new ASN1
   5446      routines: without these tracing memory leaks is very painful.
   5447      Fix leaks in PKCS12 and PKCS7 routines.
   5448      [Steve Henson]
   5449 
   5450   *) Make X509_time_adj() cope with the new behaviour of ASN1_TIME_new().
   5451      Previously it initialised the 'type' argument to V_ASN1_UTCTIME which
   5452      effectively meant GeneralizedTime would never be used. Now it
   5453      is initialised to -1 but X509_time_adj() now has to check the value
   5454      and use ASN1_TIME_set() if the value is not V_ASN1_UTCTIME or
   5455      V_ASN1_GENERALIZEDTIME, without this it always uses GeneralizedTime.
   5456      [Steve Henson, reported by Kenneth R. Robinette
   5457 				<support (a] securenetterm.com>]
   5458 
   5459   *) Fixes to BN_to_ASN1_INTEGER when bn is zero. This would previously
   5460      result in a zero length in the ASN1_INTEGER structure which was
   5461      not consistent with the structure when d2i_ASN1_INTEGER() was used
   5462      and would cause ASN1_INTEGER_cmp() to fail. Enhance s2i_ASN1_INTEGER()
   5463      to cope with hex and negative integers. Fix bug in i2a_ASN1_INTEGER()
   5464      where it did not print out a minus for negative ASN1_INTEGER.
   5465      [Steve Henson]
   5466 
   5467   *) Add summary printout to ocsp utility. The various functions which
   5468      convert status values to strings have been renamed to:
   5469      OCSP_response_status_str(), OCSP_cert_status_str() and
   5470      OCSP_crl_reason_str() and are no longer static. New options
   5471      to verify nonce values and to disable verification. OCSP response
   5472      printout format cleaned up.
   5473      [Steve Henson]
   5474 
   5475   *) Add additional OCSP certificate checks. These are those specified
   5476      in RFC2560. This consists of two separate checks: the CA of the
   5477      certificate being checked must either be the OCSP signer certificate
   5478      or the issuer of the OCSP signer certificate. In the latter case the
   5479      OCSP signer certificate must contain the OCSP signing extended key
   5480      usage. This check is performed by attempting to match the OCSP
   5481      signer or the OCSP signer CA to the issuerNameHash and issuerKeyHash
   5482      in the OCSP_CERTID structures of the response.
   5483      [Steve Henson]
   5484 
   5485   *) Initial OCSP certificate verification added to OCSP_basic_verify()
   5486      and related routines. This uses the standard OpenSSL certificate
   5487      verify routines to perform initial checks (just CA validity) and
   5488      to obtain the certificate chain. Then additional checks will be
   5489      performed on the chain. Currently the root CA is checked to see
   5490      if it is explicitly trusted for OCSP signing. This is used to set
   5491      a root CA as a global signing root: that is any certificate that
   5492      chains to that CA is an acceptable OCSP signing certificate.
   5493      [Steve Henson]
   5494 
   5495   *) New '-extfile ...' option to 'openssl ca' for reading X.509v3
   5496      extensions from a separate configuration file.
   5497      As when reading extensions from the main configuration file,
   5498      the '-extensions ...' option may be used for specifying the
   5499      section to use.
   5500      [Massimiliano Pala <madwolf (a] comune.modena.it>]
   5501 
   5502   *) New OCSP utility. Allows OCSP requests to be generated or
   5503      read. The request can be sent to a responder and the output
   5504      parsed, outputed or printed in text form. Not complete yet:
   5505      still needs to check the OCSP response validity.
   5506      [Steve Henson]
   5507 
   5508   *) New subcommands for 'openssl ca':
   5509      'openssl ca -status <serial>' prints the status of the cert with
   5510      the given serial number (according to the index file).
   5511      'openssl ca -updatedb' updates the expiry status of certificates
   5512      in the index file.
   5513      [Massimiliano Pala <madwolf (a] comune.modena.it>]
   5514 
   5515   *) New '-newreq-nodes' command option to CA.pl.  This is like
   5516      '-newreq', but calls 'openssl req' with the '-nodes' option
   5517      so that the resulting key is not encrypted.
   5518      [Damien Miller <djm (a] mindrot.org>]
   5519 
   5520   *) New configuration for the GNU Hurd.
   5521      [Jonathan Bartlett <johnnyb (a] wolfram.com> via Richard Levitte]
   5522 
   5523   *) Initial code to implement OCSP basic response verify. This
   5524      is currently incomplete. Currently just finds the signer's
   5525      certificate and verifies the signature on the response.
   5526      [Steve Henson]
   5527 
   5528   *) New SSLeay_version code SSLEAY_DIR to determine the compiled-in
   5529      value of OPENSSLDIR.  This is available via the new '-d' option
   5530      to 'openssl version', and is also included in 'openssl version -a'.
   5531      [Bodo Moeller]
   5532 
   5533   *) Allowing defining memory allocation callbacks that will be given
   5534      file name and line number information in additional arguments
   5535      (a const char* and an int).  The basic functionality remains, as
   5536      well as the original possibility to just replace malloc(),
   5537      realloc() and free() by functions that do not know about these
   5538      additional arguments.  To register and find out the current
   5539      settings for extended allocation functions, the following
   5540      functions are provided:
   5541 
   5542 	CRYPTO_set_mem_ex_functions
   5543 	CRYPTO_set_locked_mem_ex_functions
   5544 	CRYPTO_get_mem_ex_functions
   5545 	CRYPTO_get_locked_mem_ex_functions
   5546 
   5547      These work the same way as CRYPTO_set_mem_functions and friends.
   5548      CRYPTO_get_[locked_]mem_functions now writes 0 where such an
   5549      extended allocation function is enabled.
   5550      Similarly, CRYPTO_get_[locked_]mem_ex_functions writes 0 where
   5551      a conventional allocation function is enabled.
   5552      [Richard Levitte, Bodo Moeller]
   5553 
   5554   *) Finish off removing the remaining LHASH function pointer casts.
   5555      There should no longer be any prototype-casting required when using
   5556      the LHASH abstraction, and any casts that remain are "bugs". See
   5557      the callback types and macros at the head of lhash.h for details
   5558      (and "OBJ_cleanup" in crypto/objects/obj_dat.c as an example).
   5559      [Geoff Thorpe]
   5560 
   5561   *) Add automatic query of EGD sockets in RAND_poll() for the unix variant.
   5562      If /dev/[u]random devices are not available or do not return enough
   5563      entropy, EGD style sockets (served by EGD or PRNGD) will automatically
   5564      be queried.
   5565      The locations /var/run/egd-pool, /dev/egd-pool, /etc/egd-pool, and
   5566      /etc/entropy will be queried once each in this sequence, quering stops
   5567      when enough entropy was collected without querying more sockets.
   5568      [Lutz Jaenicke]
   5569 
   5570   *) Change the Unix RAND_poll() variant to be able to poll several
   5571      random devices, as specified by DEVRANDOM, until a sufficient amount
   5572      of data has been collected.   We spend at most 10 ms on each file
   5573      (select timeout) and read in non-blocking mode.  DEVRANDOM now
   5574      defaults to the list "/dev/urandom", "/dev/random", "/dev/srandom"
   5575      (previously it was just the string "/dev/urandom"), so on typical
   5576      platforms the 10 ms delay will never occur.
   5577      Also separate out the Unix variant to its own file, rand_unix.c.
   5578      For VMS, there's a currently-empty rand_vms.c.
   5579      [Richard Levitte]
   5580 
   5581   *) Move OCSP client related routines to ocsp_cl.c. These
   5582      provide utility functions which an application needing
   5583      to issue a request to an OCSP responder and analyse the
   5584      response will typically need: as opposed to those which an
   5585      OCSP responder itself would need which will be added later.
   5586 
   5587      OCSP_request_sign() signs an OCSP request with an API similar
   5588      to PKCS7_sign(). OCSP_response_status() returns status of OCSP
   5589      response. OCSP_response_get1_basic() extracts basic response
   5590      from response. OCSP_resp_find_status(): finds and extracts status
   5591      information from an OCSP_CERTID structure (which will be created
   5592      when the request structure is built). These are built from lower
   5593      level functions which work on OCSP_SINGLERESP structures but
   5594      wont normally be used unless the application wishes to examine
   5595      extensions in the OCSP response for example.
   5596 
   5597      Replace nonce routines with a pair of functions.
   5598      OCSP_request_add1_nonce() adds a nonce value and optionally
   5599      generates a random value. OCSP_check_nonce() checks the
   5600      validity of the nonce in an OCSP response.
   5601      [Steve Henson]
   5602 
   5603   *) Change function OCSP_request_add() to OCSP_request_add0_id().
   5604      This doesn't copy the supplied OCSP_CERTID and avoids the
   5605      need to free up the newly created id. Change return type
   5606      to OCSP_ONEREQ to return the internal OCSP_ONEREQ structure.
   5607      This can then be used to add extensions to the request.
   5608      Deleted OCSP_request_new(), since most of its functionality
   5609      is now in OCSP_REQUEST_new() (and the case insensitive name
   5610      clash) apart from the ability to set the request name which
   5611      will be added elsewhere.
   5612      [Steve Henson]
   5613 
   5614   *) Update OCSP API. Remove obsolete extensions argument from
   5615      various functions. Extensions are now handled using the new
   5616      OCSP extension code. New simple OCSP HTTP function which 
   5617      can be used to send requests and parse the response.
   5618      [Steve Henson]
   5619 
   5620   *) Fix the PKCS#7 (S/MIME) code to work with new ASN1. Two new
   5621      ASN1_ITEM structures help with sign and verify. PKCS7_ATTR_SIGN
   5622      uses the special reorder version of SET OF to sort the attributes
   5623      and reorder them to match the encoded order. This resolves a long
   5624      standing problem: a verify on a PKCS7 structure just after signing
   5625      it used to fail because the attribute order did not match the
   5626      encoded order. PKCS7_ATTR_VERIFY does not reorder the attributes:
   5627      it uses the received order. This is necessary to tolerate some broken
   5628      software that does not order SET OF. This is handled by encoding
   5629      as a SEQUENCE OF but using implicit tagging (with UNIVERSAL class)
   5630      to produce the required SET OF.
   5631      [Steve Henson]
   5632 
   5633   *) Have mk1mf.pl generate the macros OPENSSL_BUILD_SHLIBCRYPTO and
   5634      OPENSSL_BUILD_SHLIBSSL and use them appropriately in the header
   5635      files to get correct declarations of the ASN.1 item variables.
   5636      [Richard Levitte]
   5637 
   5638   *) Rewrite of PKCS#12 code to use new ASN1 functionality. Replace many
   5639      PKCS#12 macros with real functions. Fix two unrelated ASN1 bugs:
   5640      asn1_check_tlen() would sometimes attempt to use 'ctx' when it was
   5641      NULL and ASN1_TYPE was not dereferenced properly in asn1_ex_c2i().
   5642      New ASN1 macro: DECLARE_ASN1_ITEM() which just declares the relevant
   5643      ASN1_ITEM and no wrapper functions.
   5644      [Steve Henson]
   5645 
   5646   *) New functions or ASN1_item_d2i_fp() and ASN1_item_d2i_bio(). These
   5647      replace the old function pointer based I/O routines. Change most of
   5648      the *_d2i_bio() and *_d2i_fp() functions to use these.
   5649      [Steve Henson]
   5650 
   5651   *) Enhance mkdef.pl to be more accepting about spacing in C preprocessor
   5652      lines, recognice more "algorithms" that can be deselected, and make
   5653      it complain about algorithm deselection that isn't recognised.
   5654      [Richard Levitte]
   5655 
   5656   *) New ASN1 functions to handle dup, sign, verify, digest, pack and
   5657      unpack operations in terms of ASN1_ITEM. Modify existing wrappers
   5658      to use new functions. Add NO_ASN1_OLD which can be set to remove
   5659      some old style ASN1 functions: this can be used to determine if old
   5660      code will still work when these eventually go away.
   5661      [Steve Henson]
   5662 
   5663   *) New extension functions for OCSP structures, these follow the
   5664      same conventions as certificates and CRLs.
   5665      [Steve Henson]
   5666 
   5667   *) New function X509V3_add1_i2d(). This automatically encodes and
   5668      adds an extension. Its behaviour can be customised with various
   5669      flags to append, replace or delete. Various wrappers added for
   5670      certifcates and CRLs.
   5671      [Steve Henson]
   5672 
   5673   *) Fix to avoid calling the underlying ASN1 print routine when
   5674      an extension cannot be parsed. Correct a typo in the
   5675      OCSP_SERVICELOC extension. Tidy up print OCSP format.
   5676      [Steve Henson]
   5677 
   5678   *) Make mkdef.pl parse some of the ASN1 macros and add apropriate
   5679      entries for variables.
   5680      [Steve Henson]
   5681 
   5682   *) Add functionality to apps/openssl.c for detecting locking
   5683      problems: As the program is single-threaded, all we have
   5684      to do is register a locking callback using an array for
   5685      storing which locks are currently held by the program.
   5686      [Bodo Moeller]
   5687 
   5688   *) Use a lock around the call to CRYPTO_get_ex_new_index() in
   5689      SSL_get_ex_data_X509_STORE_idx(), which is used in
   5690      ssl_verify_cert_chain() and thus can be called at any time
   5691      during TLS/SSL handshakes so that thread-safety is essential.
   5692      Unfortunately, the ex_data design is not at all suited
   5693      for multi-threaded use, so it probably should be abolished.
   5694      [Bodo Moeller]
   5695 
   5696   *) Added Broadcom "ubsec" ENGINE to OpenSSL.
   5697      [Broadcom, tweaked and integrated by Geoff Thorpe]
   5698 
   5699   *) Move common extension printing code to new function
   5700      X509V3_print_extensions(). Reorganise OCSP print routines and
   5701      implement some needed OCSP ASN1 functions. Add OCSP extensions.
   5702      [Steve Henson]
   5703 
   5704   *) New function X509_signature_print() to remove duplication in some
   5705      print routines.
   5706      [Steve Henson]
   5707 
   5708   *) Add a special meaning when SET OF and SEQUENCE OF flags are both
   5709      set (this was treated exactly the same as SET OF previously). This
   5710      is used to reorder the STACK representing the structure to match the
   5711      encoding. This will be used to get round a problem where a PKCS7
   5712      structure which was signed could not be verified because the STACK
   5713      order did not reflect the encoded order.
   5714      [Steve Henson]
   5715 
   5716   *) Reimplement the OCSP ASN1 module using the new code.
   5717      [Steve Henson]
   5718 
   5719   *) Update the X509V3 code to permit the use of an ASN1_ITEM structure
   5720      for its ASN1 operations. The old style function pointers still exist
   5721      for now but they will eventually go away.
   5722      [Steve Henson]
   5723 
   5724   *) Merge in replacement ASN1 code from the ASN1 branch. This almost
   5725      completely replaces the old ASN1 functionality with a table driven
   5726      encoder and decoder which interprets an ASN1_ITEM structure describing
   5727      the ASN1 module. Compatibility with the existing ASN1 API (i2d,d2i) is
   5728      largely maintained. Almost all of the old asn1_mac.h macro based ASN1
   5729      has also been converted to the new form.
   5730      [Steve Henson]
   5731 
   5732   *) Change BN_mod_exp_recp so that negative moduli are tolerated
   5733      (the sign is ignored).  Similarly, ignore the sign in BN_MONT_CTX_set
   5734      so that BN_mod_exp_mont and BN_mod_exp_mont_word work
   5735      for negative moduli.
   5736      [Bodo Moeller]
   5737 
   5738   *) Fix BN_uadd and BN_usub: Always return non-negative results instead
   5739      of not touching the result's sign bit.
   5740      [Bodo Moeller]
   5741 
   5742   *) BN_div bugfix: If the result is 0, the sign (res->neg) must not be
   5743      set.
   5744      [Bodo Moeller]
   5745 
   5746   *) Changed the LHASH code to use prototypes for callbacks, and created
   5747      macros to declare and implement thin (optionally static) functions
   5748      that provide type-safety and avoid function pointer casting for the
   5749      type-specific callbacks.
   5750      [Geoff Thorpe]
   5751 
   5752   *) Added Kerberos Cipher Suites to be used with TLS, as written in
   5753      RFC 2712.
   5754      [Veers Staats <staatsvr (a] asc.hpc.mil>,
   5755       Jeffrey Altman <jaltman (a] columbia.edu>, via Richard Levitte]
   5756 
   5757   *) Reformat the FAQ so the different questions and answers can be divided
   5758      in sections depending on the subject.
   5759      [Richard Levitte]
   5760 
   5761   *) Have the zlib compression code load ZLIB.DLL dynamically under
   5762      Windows.
   5763      [Richard Levitte]
   5764 
   5765   *) New function BN_mod_sqrt for computing square roots modulo a prime
   5766      (using the probabilistic Tonelli-Shanks algorithm unless
   5767      p == 3 (mod 4)  or  p == 5 (mod 8),  which are cases that can
   5768      be handled deterministically).
   5769      [Lenka Fibikova <fibikova (a] exp-math.uni-essen.de>, Bodo Moeller]
   5770 
   5771   *) Make BN_mod_inverse faster by explicitly handling small quotients
   5772      in the Euclid loop. (Speed gain about 20% for small moduli [256 or
   5773      512 bits], about 30% for larger ones [1024 or 2048 bits].)
   5774      [Bodo Moeller]
   5775 
   5776   *) New function BN_kronecker.
   5777      [Bodo Moeller]
   5778 
   5779   *) Fix BN_gcd so that it works on negative inputs; the result is
   5780      positive unless both parameters are zero.
   5781      Previously something reasonably close to an infinite loop was
   5782      possible because numbers could be growing instead of shrinking
   5783      in the implementation of Euclid's algorithm.
   5784      [Bodo Moeller]
   5785 
   5786   *) Fix BN_is_word() and BN_is_one() macros to take into account the
   5787      sign of the number in question.
   5788 
   5789      Fix BN_is_word(a,w) to work correctly for w == 0.
   5790 
   5791      The old BN_is_word(a,w) macro is now called BN_abs_is_word(a,w)
   5792      because its test if the absolute value of 'a' equals 'w'.
   5793      Note that BN_abs_is_word does *not* handle w == 0 reliably;
   5794      it exists mostly for use in the implementations of BN_is_zero(),
   5795      BN_is_one(), and BN_is_word().
   5796      [Bodo Moeller]
   5797 
   5798   *) New function BN_swap.
   5799      [Bodo Moeller]
   5800 
   5801   *) Use BN_nnmod instead of BN_mod in crypto/bn/bn_exp.c so that
   5802      the exponentiation functions are more likely to produce reasonable
   5803      results on negative inputs.
   5804      [Bodo Moeller]
   5805 
   5806   *) Change BN_mod_mul so that the result is always non-negative.
   5807      Previously, it could be negative if one of the factors was negative;
   5808      I don't think anyone really wanted that behaviour.
   5809      [Bodo Moeller]
   5810 
   5811   *) Move BN_mod_... functions into new file crypto/bn/bn_mod.c
   5812      (except for exponentiation, which stays in crypto/bn/bn_exp.c,
   5813      and BN_mod_mul_reciprocal, which stays in crypto/bn/bn_recp.c)
   5814      and add new functions:
   5815 
   5816           BN_nnmod
   5817           BN_mod_sqr
   5818           BN_mod_add
   5819           BN_mod_add_quick
   5820           BN_mod_sub
   5821           BN_mod_sub_quick
   5822           BN_mod_lshift1
   5823           BN_mod_lshift1_quick
   5824           BN_mod_lshift
   5825           BN_mod_lshift_quick
   5826 
   5827      These functions always generate non-negative results.
   5828 
   5829      BN_nnmod otherwise is like BN_mod (if BN_mod computes a remainder  r
   5830      such that  |m| < r < 0,  BN_nnmod will output  rem + |m|  instead).
   5831 
   5832      BN_mod_XXX_quick(r, a, [b,] m) generates the same result as
   5833      BN_mod_XXX(r, a, [b,] m, ctx), but requires that  a  [and  b]
   5834      be reduced modulo  m.
   5835      [Lenka Fibikova <fibikova (a] exp-math.uni-essen.de>, Bodo Moeller]
   5836 
   5837 #if 0
   5838      The following entry accidentily appeared in the CHANGES file
   5839      distributed with OpenSSL 0.9.7.  The modifications described in
   5840      it do *not* apply to OpenSSL 0.9.7.
   5841 
   5842   *) Remove a few calls to bn_wexpand() in BN_sqr() (the one in there
   5843      was actually never needed) and in BN_mul().  The removal in BN_mul()
   5844      required a small change in bn_mul_part_recursive() and the addition
   5845      of the functions bn_cmp_part_words(), bn_sub_part_words() and
   5846      bn_add_part_words(), which do the same thing as bn_cmp_words(),
   5847      bn_sub_words() and bn_add_words() except they take arrays with
   5848      differing sizes.
   5849      [Richard Levitte]
   5850 #endif
   5851 
   5852   *) In 'openssl passwd', verify passwords read from the terminal
   5853      unless the '-salt' option is used (which usually means that
   5854      verification would just waste user's time since the resulting
   5855      hash is going to be compared with some given password hash)
   5856      or the new '-noverify' option is used.
   5857 
   5858      This is an incompatible change, but it does not affect
   5859      non-interactive use of 'openssl passwd' (passwords on the command
   5860      line, '-stdin' option, '-in ...' option) and thus should not
   5861      cause any problems.
   5862      [Bodo Moeller]
   5863 
   5864   *) Remove all references to RSAref, since there's no more need for it.
   5865      [Richard Levitte]
   5866 
   5867   *) Make DSO load along a path given through an environment variable
   5868      (SHLIB_PATH) with shl_load().
   5869      [Richard Levitte]
   5870 
   5871   *) Constify the ENGINE code as a result of BIGNUM constification.
   5872      Also constify the RSA code and most things related to it.  In a
   5873      few places, most notable in the depth of the ASN.1 code, ugly
   5874      casts back to non-const were required (to be solved at a later
   5875      time)
   5876      [Richard Levitte]
   5877 
   5878   *) Make it so the openssl application has all engines loaded by default.
   5879      [Richard Levitte]
   5880 
   5881   *) Constify the BIGNUM routines a little more.
   5882      [Richard Levitte]
   5883 
   5884   *) Add the following functions:
   5885 
   5886 	ENGINE_load_cswift()
   5887 	ENGINE_load_chil()
   5888 	ENGINE_load_atalla()
   5889 	ENGINE_load_nuron()
   5890 	ENGINE_load_builtin_engines()
   5891 
   5892      That way, an application can itself choose if external engines that
   5893      are built-in in OpenSSL shall ever be used or not.  The benefit is
   5894      that applications won't have to be linked with libdl or other dso
   5895      libraries unless it's really needed.
   5896 
   5897      Changed 'openssl engine' to load all engines on demand.
   5898      Changed the engine header files to avoid the duplication of some
   5899      declarations (they differed!).
   5900      [Richard Levitte]
   5901 
   5902   *) 'openssl engine' can now list capabilities.
   5903      [Richard Levitte]
   5904 
   5905   *) Better error reporting in 'openssl engine'.
   5906      [Richard Levitte]
   5907 
   5908   *) Never call load_dh_param(NULL) in s_server.
   5909      [Bodo Moeller]
   5910 
   5911   *) Add engine application.  It can currently list engines by name and
   5912      identity, and test if they are actually available.
   5913      [Richard Levitte]
   5914 
   5915   *) Improve RPM specification file by forcing symbolic linking and making
   5916      sure the installed documentation is also owned by root.root.
   5917      [Damien Miller <djm (a] mindrot.org>]
   5918 
   5919   *) Give the OpenSSL applications more possibilities to make use of
   5920      keys (public as well as private) handled by engines.
   5921      [Richard Levitte]
   5922 
   5923   *) Add OCSP code that comes from CertCo.
   5924      [Richard Levitte]
   5925 
   5926   *) Add VMS support for the Rijndael code.
   5927      [Richard Levitte]
   5928 
   5929   *) Added untested support for Nuron crypto accelerator.
   5930      [Ben Laurie]
   5931 
   5932   *) Add support for external cryptographic devices.  This code was
   5933      previously distributed separately as the "engine" branch.
   5934      [Geoff Thorpe, Richard Levitte]
   5935 
   5936   *) Rework the filename-translation in the DSO code. It is now possible to
   5937      have far greater control over how a "name" is turned into a filename
   5938      depending on the operating environment and any oddities about the
   5939      different shared library filenames on each system.
   5940      [Geoff Thorpe]
   5941 
   5942   *) Support threads on FreeBSD-elf in Configure.
   5943      [Richard Levitte]
   5944 
   5945   *) Fix for SHA1 assembly problem with MASM: it produces
   5946      warnings about corrupt line number information when assembling
   5947      with debugging information. This is caused by the overlapping
   5948      of two sections.
   5949      [Bernd Matthes <mainbug (a] celocom.de>, Steve Henson]
   5950 
   5951   *) NCONF changes.
   5952      NCONF_get_number() has no error checking at all.  As a replacement,
   5953      NCONF_get_number_e() is defined (_e for "error checking") and is
   5954      promoted strongly.  The old NCONF_get_number is kept around for
   5955      binary backward compatibility.
   5956      Make it possible for methods to load from something other than a BIO,
   5957      by providing a function pointer that is given a name instead of a BIO.
   5958      For example, this could be used to load configuration data from an
   5959      LDAP server.
   5960      [Richard Levitte]
   5961 
   5962   *) Fix for non blocking accept BIOs. Added new I/O special reason
   5963      BIO_RR_ACCEPT to cover this case. Previously use of accept BIOs
   5964      with non blocking I/O was not possible because no retry code was
   5965      implemented. Also added new SSL code SSL_WANT_ACCEPT to cover
   5966      this case.
   5967      [Steve Henson]
   5968 
   5969   *) Added the beginnings of Rijndael support.
   5970      [Ben Laurie]
   5971 
   5972   *) Fix for bug in DirectoryString mask setting. Add support for
   5973      X509_NAME_print_ex() in 'req' and X509_print_ex() function
   5974      to allow certificate printing to more controllable, additional
   5975      'certopt' option to 'x509' to allow new printing options to be
   5976      set.
   5977      [Steve Henson]
   5978 
   5979   *) Clean old EAY MD5 hack from e_os.h.
   5980      [Richard Levitte]
   5981 
   5982  Changes between 0.9.6l and 0.9.6m  [17 Mar 2004]
   5983 
   5984   *) Fix null-pointer assignment in do_change_cipher_spec() revealed
   5985      by using the Codenomicon TLS Test Tool (CVE-2004-0079)
   5986      [Joe Orton, Steve Henson]
   5987 
   5988  Changes between 0.9.6k and 0.9.6l  [04 Nov 2003]
   5989 
   5990   *) Fix additional bug revealed by the NISCC test suite:
   5991 
   5992      Stop bug triggering large recursion when presented with
   5993      certain ASN.1 tags (CVE-2003-0851)
   5994      [Steve Henson]
   5995 
   5996  Changes between 0.9.6j and 0.9.6k  [30 Sep 2003]
   5997 
   5998   *) Fix various bugs revealed by running the NISCC test suite:
   5999 
   6000      Stop out of bounds reads in the ASN1 code when presented with
   6001      invalid tags (CVE-2003-0543 and CVE-2003-0544).
   6002      
   6003      If verify callback ignores invalid public key errors don't try to check
   6004      certificate signature with the NULL public key.
   6005 
   6006      [Steve Henson]
   6007 
   6008   *) In ssl3_accept() (ssl/s3_srvr.c) only accept a client certificate
   6009      if the server requested one: as stated in TLS 1.0 and SSL 3.0
   6010      specifications.
   6011      [Steve Henson]
   6012 
   6013   *) In ssl3_get_client_hello() (ssl/s3_srvr.c), tolerate additional
   6014      extra data after the compression methods not only for TLS 1.0
   6015      but also for SSL 3.0 (as required by the specification).
   6016      [Bodo Moeller; problem pointed out by Matthias Loepfe]
   6017 
   6018   *) Change X509_certificate_type() to mark the key as exported/exportable
   6019      when it's 512 *bits* long, not 512 bytes.
   6020      [Richard Levitte]
   6021 
   6022  Changes between 0.9.6i and 0.9.6j  [10 Apr 2003]
   6023 
   6024   *) Countermeasure against the Klima-Pokorny-Rosa extension of
   6025      Bleichbacher's attack on PKCS #1 v1.5 padding: treat
   6026      a protocol version number mismatch like a decryption error
   6027      in ssl3_get_client_key_exchange (ssl/s3_srvr.c).
   6028      [Bodo Moeller]
   6029 
   6030   *) Turn on RSA blinding by default in the default implementation
   6031      to avoid a timing attack. Applications that don't want it can call
   6032      RSA_blinding_off() or use the new flag RSA_FLAG_NO_BLINDING.
   6033      They would be ill-advised to do so in most cases.
   6034      [Ben Laurie, Steve Henson, Geoff Thorpe, Bodo Moeller]
   6035 
   6036   *) Change RSA blinding code so that it works when the PRNG is not
   6037      seeded (in this case, the secret RSA exponent is abused as
   6038      an unpredictable seed -- if it is not unpredictable, there
   6039      is no point in blinding anyway).  Make RSA blinding thread-safe
   6040      by remembering the creator's thread ID in rsa->blinding and
   6041      having all other threads use local one-time blinding factors
   6042      (this requires more computation than sharing rsa->blinding, but
   6043      avoids excessive locking; and if an RSA object is not shared
   6044      between threads, blinding will still be very fast).
   6045      [Bodo Moeller]
   6046 
   6047  Changes between 0.9.6h and 0.9.6i  [19 Feb 2003]
   6048 
   6049   *) In ssl3_get_record (ssl/s3_pkt.c), minimize information leaked
   6050      via timing by performing a MAC computation even if incorrrect
   6051      block cipher padding has been found.  This is a countermeasure
   6052      against active attacks where the attacker has to distinguish
   6053      between bad padding and a MAC verification error. (CVE-2003-0078)
   6054 
   6055      [Bodo Moeller; problem pointed out by Brice Canvel (EPFL),
   6056      Alain Hiltgen (UBS), Serge Vaudenay (EPFL), and
   6057      Martin Vuagnoux (EPFL, Ilion)]
   6058 
   6059  Changes between 0.9.6g and 0.9.6h  [5 Dec 2002]
   6060 
   6061   *) New function OPENSSL_cleanse(), which is used to cleanse a section of
   6062      memory from it's contents.  This is done with a counter that will
   6063      place alternating values in each byte.  This can be used to solve
   6064      two issues: 1) the removal of calls to memset() by highly optimizing
   6065      compilers, and 2) cleansing with other values than 0, since those can
   6066      be read through on certain media, for example a swap space on disk.
   6067      [Geoff Thorpe]
   6068 
   6069   *) Bugfix: client side session caching did not work with external caching,
   6070      because the session->cipher setting was not restored when reloading
   6071      from the external cache. This problem was masked, when
   6072      SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG (part of SSL_OP_ALL) was set.
   6073      (Found by Steve Haslam <steve (a] araqnid.ddts.net>.)
   6074      [Lutz Jaenicke]
   6075 
   6076   *) Fix client_certificate (ssl/s2_clnt.c): The permissible total
   6077      length of the REQUEST-CERTIFICATE message is 18 .. 34, not 17 .. 33.
   6078      [Zeev Lieber <zeev-l (a] yahoo.com>]
   6079 
   6080   *) Undo an undocumented change introduced in 0.9.6e which caused
   6081      repeated calls to OpenSSL_add_all_ciphers() and 
   6082      OpenSSL_add_all_digests() to be ignored, even after calling
   6083      EVP_cleanup().
   6084      [Richard Levitte]
   6085 
   6086   *) Change the default configuration reader to deal with last line not
   6087      being properly terminated.
   6088      [Richard Levitte]
   6089 
   6090   *) Change X509_NAME_cmp() so it applies the special rules on handling
   6091      DN values that are of type PrintableString, as well as RDNs of type
   6092      emailAddress where the value has the type ia5String.
   6093      [stefank (a] valicert.com via Richard Levitte]
   6094 
   6095   *) Add a SSL_SESS_CACHE_NO_INTERNAL_STORE flag to take over half
   6096      the job SSL_SESS_CACHE_NO_INTERNAL_LOOKUP was inconsistently
   6097      doing, define a new flag (SSL_SESS_CACHE_NO_INTERNAL) to be
   6098      the bitwise-OR of the two for use by the majority of applications
   6099      wanting this behaviour, and update the docs. The documented
   6100      behaviour and actual behaviour were inconsistent and had been
   6101      changing anyway, so this is more a bug-fix than a behavioural
   6102      change.
   6103      [Geoff Thorpe, diagnosed by Nadav Har'El]
   6104 
   6105   *) Don't impose a 16-byte length minimum on session IDs in ssl/s3_clnt.c
   6106      (the SSL 3.0 and TLS 1.0 specifications allow any length up to 32 bytes).
   6107      [Bodo Moeller]
   6108 
   6109   *) Fix initialization code race conditions in
   6110         SSLv23_method(),  SSLv23_client_method(),   SSLv23_server_method(),
   6111         SSLv2_method(),   SSLv2_client_method(),    SSLv2_server_method(),
   6112         SSLv3_method(),   SSLv3_client_method(),    SSLv3_server_method(),
   6113         TLSv1_method(),   TLSv1_client_method(),    TLSv1_server_method(),
   6114         ssl2_get_cipher_by_char(),
   6115         ssl3_get_cipher_by_char().
   6116      [Patrick McCormick <patrick (a] tellme.com>, Bodo Moeller]
   6117 
   6118   *) Reorder cleanup sequence in SSL_CTX_free(): only remove the ex_data after
   6119      the cached sessions are flushed, as the remove_cb() might use ex_data
   6120      contents. Bug found by Sam Varshavchik <mrsam (a] courier-mta.com>
   6121      (see [openssl.org #212]).
   6122      [Geoff Thorpe, Lutz Jaenicke]
   6123 
   6124   *) Fix typo in OBJ_txt2obj which incorrectly passed the content
   6125      length, instead of the encoding length to d2i_ASN1_OBJECT.
   6126      [Steve Henson]
   6127 
   6128  Changes between 0.9.6f and 0.9.6g  [9 Aug 2002]
   6129 
   6130   *) [In 0.9.6g-engine release:]
   6131      Fix crypto/engine/vendor_defns/cswift.h for WIN32 (use '_stdcall').
   6132      [Lynn Gazis <lgazis (a] rainbow.com>]
   6133 
   6134  Changes between 0.9.6e and 0.9.6f  [8 Aug 2002]
   6135 
   6136   *) Fix ASN1 checks. Check for overflow by comparing with LONG_MAX
   6137      and get fix the header length calculation.
   6138      [Florian Weimer <Weimer (a] CERT.Uni-Stuttgart.DE>,
   6139 	Alon Kantor <alonk (a] checkpoint.com> (and others),
   6140 	Steve Henson]
   6141 
   6142   *) Use proper error handling instead of 'assertions' in buffer
   6143      overflow checks added in 0.9.6e.  This prevents DoS (the
   6144      assertions could call abort()).
   6145      [Arne Ansper <arne (a] ats.cyber.ee>, Bodo Moeller]
   6146 
   6147  Changes between 0.9.6d and 0.9.6e  [30 Jul 2002]
   6148 
   6149   *) Add various sanity checks to asn1_get_length() to reject
   6150      the ASN1 length bytes if they exceed sizeof(long), will appear
   6151      negative or the content length exceeds the length of the
   6152      supplied buffer.
   6153      [Steve Henson, Adi Stav <stav (a] mercury.co.il>, James Yonan <jim (a] ntlp.com>]
   6154 
   6155   *) Fix cipher selection routines: ciphers without encryption had no flags
   6156      for the cipher strength set and where therefore not handled correctly
   6157      by the selection routines (PR #130).
   6158      [Lutz Jaenicke]
   6159 
   6160   *) Fix EVP_dsa_sha macro.
   6161      [Nils Larsch]
   6162 
   6163   *) New option
   6164           SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
   6165      for disabling the SSL 3.0/TLS 1.0 CBC vulnerability countermeasure
   6166      that was added in OpenSSL 0.9.6d.
   6167 
   6168      As the countermeasure turned out to be incompatible with some
   6169      broken SSL implementations, the new option is part of SSL_OP_ALL.
   6170      SSL_OP_ALL is usually employed when compatibility with weird SSL
   6171      implementations is desired (e.g. '-bugs' option to 's_client' and
   6172      's_server'), so the new option is automatically set in many
   6173      applications.
   6174      [Bodo Moeller]
   6175 
   6176   *) Changes in security patch:
   6177 
   6178      Changes marked "(CHATS)" were sponsored by the Defense Advanced
   6179      Research Projects Agency (DARPA) and Air Force Research Laboratory,
   6180      Air Force Materiel Command, USAF, under agreement number
   6181      F30602-01-2-0537.
   6182 
   6183   *) Add various sanity checks to asn1_get_length() to reject
   6184      the ASN1 length bytes if they exceed sizeof(long), will appear
   6185      negative or the content length exceeds the length of the
   6186      supplied buffer. (CVE-2002-0659)
   6187      [Steve Henson, Adi Stav <stav (a] mercury.co.il>, James Yonan <jim (a] ntlp.com>]
   6188 
   6189   *) Assertions for various potential buffer overflows, not known to
   6190      happen in practice.
   6191      [Ben Laurie (CHATS)]
   6192 
   6193   *) Various temporary buffers to hold ASCII versions of integers were
   6194      too small for 64 bit platforms. (CVE-2002-0655)
   6195      [Matthew Byng-Maddick <mbm (a] aldigital.co.uk> and Ben Laurie (CHATS)>
   6196 
   6197   *) Remote buffer overflow in SSL3 protocol - an attacker could
   6198      supply an oversized session ID to a client. (CVE-2002-0656)
   6199      [Ben Laurie (CHATS)]
   6200 
   6201   *) Remote buffer overflow in SSL2 protocol - an attacker could
   6202      supply an oversized client master key. (CVE-2002-0656)
   6203      [Ben Laurie (CHATS)]
   6204 
   6205  Changes between 0.9.6c and 0.9.6d  [9 May 2002]
   6206 
   6207   *) Fix crypto/asn1/a_sign.c so that 'parameters' is omitted (not
   6208      encoded as NULL) with id-dsa-with-sha1.
   6209      [Nils Larsch <nla (a] trustcenter.de>; problem pointed out by Bodo Moeller]
   6210 
   6211   *) Check various X509_...() return values in apps/req.c.
   6212      [Nils Larsch <nla (a] trustcenter.de>]
   6213 
   6214   *) Fix BASE64 decode (EVP_DecodeUpdate) for data with CR/LF ended lines:
   6215      an end-of-file condition would erronously be flagged, when the CRLF
   6216      was just at the end of a processed block. The bug was discovered when
   6217      processing data through a buffering memory BIO handing the data to a
   6218      BASE64-decoding BIO. Bug fund and patch submitted by Pavel Tsekov
   6219      <ptsekov (a] syntrex.com> and Nedelcho Stanev.
   6220      [Lutz Jaenicke]
   6221 
   6222   *) Implement a countermeasure against a vulnerability recently found
   6223      in CBC ciphersuites in SSL 3.0/TLS 1.0: Send an empty fragment
   6224      before application data chunks to avoid the use of known IVs
   6225      with data potentially chosen by the attacker.
   6226      [Bodo Moeller]
   6227 
   6228   *) Fix length checks in ssl3_get_client_hello().
   6229      [Bodo Moeller]
   6230 
   6231   *) TLS/SSL library bugfix: use s->s3->in_read_app_data differently
   6232      to prevent ssl3_read_internal() from incorrectly assuming that
   6233      ssl3_read_bytes() found application data while handshake
   6234      processing was enabled when in fact s->s3->in_read_app_data was
   6235      merely automatically cleared during the initial handshake.
   6236      [Bodo Moeller; problem pointed out by Arne Ansper <arne (a] ats.cyber.ee>]
   6237 
   6238   *) Fix object definitions for Private and Enterprise: they were not
   6239      recognized in their shortname (=lowercase) representation. Extend
   6240      obj_dat.pl to issue an error when using undefined keywords instead
   6241      of silently ignoring the problem (Svenning Sorensen
   6242      <sss (a] sss.dnsalias.net>).
   6243      [Lutz Jaenicke]
   6244 
   6245   *) Fix DH_generate_parameters() so that it works for 'non-standard'
   6246      generators, i.e. generators other than 2 and 5.  (Previously, the
   6247      code did not properly initialise the 'add' and 'rem' values to
   6248      BN_generate_prime().)
   6249 
   6250      In the new general case, we do not insist that 'generator' is
   6251      actually a primitive root: This requirement is rather pointless;
   6252      a generator of the order-q subgroup is just as good, if not
   6253      better.
   6254      [Bodo Moeller]
   6255  
   6256   *) Map new X509 verification errors to alerts. Discovered and submitted by
   6257      Tom Wu <tom (a] arcot.com>.
   6258      [Lutz Jaenicke]
   6259 
   6260   *) Fix ssl3_pending() (ssl/s3_lib.c) to prevent SSL_pending() from
   6261      returning non-zero before the data has been completely received
   6262      when using non-blocking I/O.
   6263      [Bodo Moeller; problem pointed out by John Hughes]
   6264 
   6265   *) Some of the ciphers missed the strength entry (SSL_LOW etc).
   6266      [Ben Laurie, Lutz Jaenicke]
   6267 
   6268   *) Fix bug in SSL_clear(): bad sessions were not removed (found by
   6269      Yoram Zahavi <YoramZ (a] gilian.com>).
   6270      [Lutz Jaenicke]
   6271 
   6272   *) Add information about CygWin 1.3 and on, and preserve proper
   6273      configuration for the versions before that.
   6274      [Corinna Vinschen <vinschen (a] redhat.com> and Richard Levitte]
   6275 
   6276   *) Make removal from session cache (SSL_CTX_remove_session()) more robust:
   6277      check whether we deal with a copy of a session and do not delete from
   6278      the cache in this case. Problem reported by "Izhar Shoshani Levi"
   6279      <izhar (a] checkpoint.com>.
   6280      [Lutz Jaenicke]
   6281 
   6282   *) Do not store session data into the internal session cache, if it
   6283      is never intended to be looked up (SSL_SESS_CACHE_NO_INTERNAL_LOOKUP
   6284      flag is set). Proposed by Aslam <aslam (a] funk.com>.
   6285      [Lutz Jaenicke]
   6286 
   6287   *) Have ASN1_BIT_STRING_set_bit() really clear a bit when the requested
   6288      value is 0.
   6289      [Richard Levitte]
   6290 
   6291   *) [In 0.9.6d-engine release:]
   6292      Fix a crashbug and a logic bug in hwcrhk_load_pubkey().
   6293      [Toomas Kiisk <vix (a] cyber.ee> via Richard Levitte]
   6294 
   6295   *) Add the configuration target linux-s390x.
   6296      [Neale Ferguson <Neale.Ferguson (a] SoftwareAG-USA.com> via Richard Levitte]
   6297 
   6298   *) The earlier bugfix for the SSL3_ST_SW_HELLO_REQ_C case of
   6299      ssl3_accept (ssl/s3_srvr.c) incorrectly used a local flag
   6300      variable as an indication that a ClientHello message has been
   6301      received.  As the flag value will be lost between multiple
   6302      invocations of ssl3_accept when using non-blocking I/O, the
   6303      function may not be aware that a handshake has actually taken
   6304      place, thus preventing a new session from being added to the
   6305      session cache.
   6306 
   6307      To avoid this problem, we now set s->new_session to 2 instead of
   6308      using a local variable.
   6309      [Lutz Jaenicke, Bodo Moeller]
   6310 
   6311   *) Bugfix: Return -1 from ssl3_get_server_done (ssl3/s3_clnt.c)
   6312      if the SSL_R_LENGTH_MISMATCH error is detected.
   6313      [Geoff Thorpe, Bodo Moeller]
   6314 
   6315   *) New 'shared_ldflag' column in Configure platform table.
   6316      [Richard Levitte]
   6317 
   6318   *) Fix EVP_CIPHER_mode macro.
   6319      ["Dan S. Camper" <dan (a] bti.net>]
   6320 
   6321   *) Fix ssl3_read_bytes (ssl/s3_pkt.c): To ignore messages of unknown
   6322      type, we must throw them away by setting rr->length to 0.
   6323      [D P Chang <dpc (a] qualys.com>]
   6324 
   6325  Changes between 0.9.6b and 0.9.6c  [21 dec 2001]
   6326 
   6327   *) Fix BN_rand_range bug pointed out by Dominikus Scherkl
   6328      <Dominikus.Scherkl (a] biodata.com>.  (The previous implementation
   6329      worked incorrectly for those cases where  range = 10..._2  and
   6330      3*range  is two bits longer than  range.)
   6331      [Bodo Moeller]
   6332 
   6333   *) Only add signing time to PKCS7 structures if it is not already
   6334      present.
   6335      [Steve Henson]
   6336 
   6337   *) Fix crypto/objects/objects.h: "ld-ce" should be "id-ce",
   6338      OBJ_ld_ce should be OBJ_id_ce.
   6339      Also some ip-pda OIDs in crypto/objects/objects.txt were
   6340      incorrect (cf. RFC 3039).
   6341      [Matt Cooper, Frederic Giudicelli, Bodo Moeller]
   6342 
   6343   *) Release CRYPTO_LOCK_DYNLOCK when CRYPTO_destroy_dynlockid()
   6344      returns early because it has nothing to do.
   6345      [Andy Schneider <andy.schneider (a] bjss.co.uk>]
   6346 
   6347   *) [In 0.9.6c-engine release:]
   6348      Fix mutex callback return values in crypto/engine/hw_ncipher.c.
   6349      [Andy Schneider <andy.schneider (a] bjss.co.uk>]
   6350 
   6351   *) [In 0.9.6c-engine release:]
   6352      Add support for Cryptographic Appliance's keyserver technology.
   6353      (Use engine 'keyclient')
   6354      [Cryptographic Appliances and Geoff Thorpe]
   6355 
   6356   *) Add a configuration entry for OS/390 Unix.  The C compiler 'c89'
   6357      is called via tools/c89.sh because arguments have to be
   6358      rearranged (all '-L' options must appear before the first object
   6359      modules).
   6360      [Richard Shapiro <rshapiro (a] abinitio.com>]
   6361 
   6362   *) [In 0.9.6c-engine release:]
   6363      Add support for Broadcom crypto accelerator cards, backported
   6364      from 0.9.7.
   6365      [Broadcom, Nalin Dahyabhai <nalin (a] redhat.com>, Mark Cox]
   6366 
   6367   *) [In 0.9.6c-engine release:]
   6368      Add support for SureWare crypto accelerator cards from 
   6369      Baltimore Technologies.  (Use engine 'sureware')
   6370      [Baltimore Technologies and Mark Cox]
   6371 
   6372   *) [In 0.9.6c-engine release:]
   6373      Add support for crypto accelerator cards from Accelerated
   6374      Encryption Processing, www.aep.ie.  (Use engine 'aep')
   6375      [AEP Inc. and Mark Cox]
   6376 
   6377   *) Add a configuration entry for gcc on UnixWare.
   6378      [Gary Benson <gbenson (a] redhat.com>]
   6379 
   6380   *) Change ssl/s2_clnt.c and ssl/s2_srvr.c so that received handshake
   6381      messages are stored in a single piece (fixed-length part and
   6382      variable-length part combined) and fix various bugs found on the way.
   6383      [Bodo Moeller]
   6384 
   6385   *) Disable caching in BIO_gethostbyname(), directly use gethostbyname()
   6386      instead.  BIO_gethostbyname() does not know what timeouts are
   6387      appropriate, so entries would stay in cache even when they have
   6388      become invalid.
   6389      [Bodo Moeller; problem pointed out by Rich Salz <rsalz (a] zolera.com>
   6390 
   6391   *) Change ssl23_get_client_hello (ssl/s23_srvr.c) behaviour when
   6392      faced with a pathologically small ClientHello fragment that does
   6393      not contain client_version: Instead of aborting with an error,
   6394      simply choose the highest available protocol version (i.e.,
   6395      TLS 1.0 unless it is disabled).  In practice, ClientHello
   6396      messages are never sent like this, but this change gives us
   6397      strictly correct behaviour at least for TLS.
   6398      [Bodo Moeller]
   6399 
   6400   *) Fix SSL handshake functions and SSL_clear() such that SSL_clear()
   6401      never resets s->method to s->ctx->method when called from within
   6402      one of the SSL handshake functions.
   6403      [Bodo Moeller; problem pointed out by Niko Baric]
   6404 
   6405   *) In ssl3_get_client_hello (ssl/s3_srvr.c), generate a fatal alert
   6406      (sent using the client's version number) if client_version is
   6407      smaller than the protocol version in use.  Also change
   6408      ssl23_get_client_hello (ssl/s23_srvr.c) to select TLS 1.0 if
   6409      the client demanded SSL 3.0 but only TLS 1.0 is enabled; then
   6410      the client will at least see that alert.
   6411      [Bodo Moeller]
   6412 
   6413   *) Fix ssl3_get_message (ssl/s3_both.c) to handle message fragmentation
   6414      correctly.
   6415      [Bodo Moeller]
   6416 
   6417   *) Avoid infinite loop in ssl3_get_message (ssl/s3_both.c) if a
   6418      client receives HelloRequest while in a handshake.
   6419      [Bodo Moeller; bug noticed by Andy Schneider <andy.schneider (a] bjss.co.uk>]
   6420 
   6421   *) Bugfix in ssl3_accept (ssl/s3_srvr.c): Case SSL3_ST_SW_HELLO_REQ_C
   6422      should end in 'break', not 'goto end' which circuments various
   6423      cleanups done in state SSL_ST_OK.   But session related stuff
   6424      must be disabled for SSL_ST_OK in the case that we just sent a
   6425      HelloRequest.
   6426 
   6427      Also avoid some overhead by not calling ssl_init_wbio_buffer()
   6428      before just sending a HelloRequest.
   6429      [Bodo Moeller, Eric Rescorla <ekr (a] rtfm.com>]
   6430 
   6431   *) Fix ssl/s3_enc.c, ssl/t1_enc.c and ssl/s3_pkt.c so that we don't
   6432      reveal whether illegal block cipher padding was found or a MAC
   6433      verification error occured.  (Neither SSLerr() codes nor alerts
   6434      are directly visible to potential attackers, but the information
   6435      may leak via logfiles.)
   6436 
   6437      Similar changes are not required for the SSL 2.0 implementation
   6438      because the number of padding bytes is sent in clear for SSL 2.0,
   6439      and the extra bytes are just ignored.  However ssl/s2_pkt.c
   6440      failed to verify that the purported number of padding bytes is in
   6441      the legal range.
   6442      [Bodo Moeller]
   6443 
   6444   *) Add OpenUNIX-8 support including shared libraries
   6445      (Boyd Lynn Gerber <gerberb (a] zenez.com>).
   6446      [Lutz Jaenicke]
   6447 
   6448   *) Improve RSA_padding_check_PKCS1_OAEP() check again to avoid
   6449      'wristwatch attack' using huge encoding parameters (cf.
   6450      James H. Manger's CRYPTO 2001 paper).  Note that the
   6451      RSA_PKCS1_OAEP_PADDING case of RSA_private_decrypt() does not use
   6452      encoding parameters and hence was not vulnerable.
   6453      [Bodo Moeller]
   6454 
   6455   *) BN_sqr() bug fix.
   6456      [Ulf Mller, reported by Jim Ellis <jim.ellis (a] cavium.com>]
   6457 
   6458   *) Rabin-Miller test analyses assume uniformly distributed witnesses,
   6459      so use BN_pseudo_rand_range() instead of using BN_pseudo_rand()
   6460      followed by modular reduction.
   6461      [Bodo Moeller; pointed out by Adam Young <AYoung1 (a] NCSUS.JNJ.COM>]
   6462 
   6463   *) Add BN_pseudo_rand_range() with obvious functionality: BN_rand_range()
   6464      equivalent based on BN_pseudo_rand() instead of BN_rand().
   6465      [Bodo Moeller]
   6466 
   6467   *) s3_srvr.c: allow sending of large client certificate lists (> 16 kB).
   6468      This function was broken, as the check for a new client hello message
   6469      to handle SGC did not allow these large messages.
   6470      (Tracked down by "Douglas E. Engert" <deengert (a] anl.gov>.)
   6471      [Lutz Jaenicke]
   6472 
   6473   *) Add alert descriptions for TLSv1 to SSL_alert_desc_string[_long]().
   6474      [Lutz Jaenicke]
   6475 
   6476   *) Fix buggy behaviour of BIO_get_num_renegotiates() and BIO_ctrl()
   6477      for BIO_C_GET_WRITE_BUF_SIZE ("Stephen Hinton" <shinton (a] netopia.com>).
   6478      [Lutz Jaenicke]
   6479 
   6480   *) Rework the configuration and shared library support for Tru64 Unix.
   6481      The configuration part makes use of modern compiler features and
   6482      still retains old compiler behavior for those that run older versions
   6483      of the OS.  The shared library support part includes a variant that
   6484      uses the RPATH feature, and is available through the special
   6485      configuration target "alpha-cc-rpath", which will never be selected
   6486      automatically.
   6487      [Tim Mooney <mooney (a] dogbert.cc.ndsu.NoDak.edu> via Richard Levitte]
   6488 
   6489   *) In ssl3_get_key_exchange (ssl/s3_clnt.c), call ssl3_get_message()
   6490      with the same message size as in ssl3_get_certificate_request().
   6491      Otherwise, if no ServerKeyExchange message occurs, CertificateRequest
   6492      messages might inadvertently be reject as too long.
   6493      [Petr Lampa <lampa (a] fee.vutbr.cz>]
   6494 
   6495   *) Enhanced support for IA-64 Unix platforms (well, Linux and HP-UX).
   6496      [Andy Polyakov]
   6497 
   6498   *) Modified SSL library such that the verify_callback that has been set
   6499      specificly for an SSL object with SSL_set_verify() is actually being
   6500      used. Before the change, a verify_callback set with this function was
   6501      ignored and the verify_callback() set in the SSL_CTX at the time of
   6502      the call was used. New function X509_STORE_CTX_set_verify_cb() introduced
   6503      to allow the necessary settings.
   6504      [Lutz Jaenicke]
   6505 
   6506   *) Initialize static variable in crypto/dsa/dsa_lib.c and crypto/dh/dh_lib.c
   6507      explicitly to NULL, as at least on Solaris 8 this seems not always to be
   6508      done automatically (in contradiction to the requirements of the C
   6509      standard). This made problems when used from OpenSSH.
   6510      [Lutz Jaenicke]
   6511 
   6512   *) In OpenSSL 0.9.6a and 0.9.6b, crypto/dh/dh_key.c ignored
   6513      dh->length and always used
   6514 
   6515           BN_rand_range(priv_key, dh->p).
   6516 
   6517      BN_rand_range() is not necessary for Diffie-Hellman, and this
   6518      specific range makes Diffie-Hellman unnecessarily inefficient if
   6519      dh->length (recommended exponent length) is much smaller than the
   6520      length of dh->p.  We could use BN_rand_range() if the order of
   6521      the subgroup was stored in the DH structure, but we only have
   6522      dh->length.
   6523 
   6524      So switch back to
   6525 
   6526           BN_rand(priv_key, l, ...)
   6527 
   6528      where 'l' is dh->length if this is defined, or BN_num_bits(dh->p)-1
   6529      otherwise.
   6530      [Bodo Moeller]
   6531 
   6532   *) In
   6533 
   6534           RSA_eay_public_encrypt
   6535           RSA_eay_private_decrypt
   6536           RSA_eay_private_encrypt (signing)
   6537           RSA_eay_public_decrypt (signature verification)
   6538 
   6539      (default implementations for RSA_public_encrypt,
   6540      RSA_private_decrypt, RSA_private_encrypt, RSA_public_decrypt),
   6541      always reject numbers >= n.
   6542      [Bodo Moeller]
   6543 
   6544   *) In crypto/rand/md_rand.c, use a new short-time lock CRYPTO_LOCK_RAND2
   6545      to synchronize access to 'locking_thread'.  This is necessary on
   6546      systems where access to 'locking_thread' (an 'unsigned long'
   6547      variable) is not atomic.
   6548      [Bodo Moeller]
   6549 
   6550   *) In crypto/rand/md_rand.c, set 'locking_thread' to current thread's ID
   6551      *before* setting the 'crypto_lock_rand' flag.  The previous code had
   6552      a race condition if 0 is a valid thread ID.
   6553      [Travis Vitek <vitek (a] roguewave.com>]
   6554 
   6555   *) Add support for shared libraries under Irix.
   6556      [Albert Chin-A-Young <china (a] thewrittenword.com>]
   6557 
   6558   *) Add configuration option to build on Linux on both big-endian and
   6559      little-endian MIPS.
   6560      [Ralf Baechle <ralf (a] uni-koblenz.de>]
   6561 
   6562   *) Add the possibility to create shared libraries on HP-UX.
   6563      [Richard Levitte]
   6564 
   6565  Changes between 0.9.6a and 0.9.6b  [9 Jul 2001]
   6566 
   6567   *) Change ssleay_rand_bytes (crypto/rand/md_rand.c)
   6568      to avoid a SSLeay/OpenSSL PRNG weakness pointed out by
   6569      Markku-Juhani O. Saarinen <markku-juhani.saarinen (a] nokia.com>:
   6570      PRNG state recovery was possible based on the output of
   6571      one PRNG request appropriately sized to gain knowledge on
   6572      'md' followed by enough consecutive 1-byte PRNG requests
   6573      to traverse all of 'state'.
   6574 
   6575      1. When updating 'md_local' (the current thread's copy of 'md')
   6576         during PRNG output generation, hash all of the previous
   6577         'md_local' value, not just the half used for PRNG output.
   6578 
   6579      2. Make the number of bytes from 'state' included into the hash
   6580         independent from the number of PRNG bytes requested.
   6581 
   6582      The first measure alone would be sufficient to avoid
   6583      Markku-Juhani's attack.  (Actually it had never occurred
   6584      to me that the half of 'md_local' used for chaining was the
   6585      half from which PRNG output bytes were taken -- I had always
   6586      assumed that the secret half would be used.)  The second
   6587      measure makes sure that additional data from 'state' is never
   6588      mixed into 'md_local' in small portions; this heuristically
   6589      further strengthens the PRNG.
   6590      [Bodo Moeller]
   6591 
   6592   *) Fix crypto/bn/asm/mips3.s.
   6593      [Andy Polyakov]
   6594 
   6595   *) When only the key is given to "enc", the IV is undefined. Print out
   6596      an error message in this case.
   6597      [Lutz Jaenicke]
   6598 
   6599   *) Handle special case when X509_NAME is empty in X509 printing routines.
   6600      [Steve Henson]
   6601 
   6602   *) In dsa_do_verify (crypto/dsa/dsa_ossl.c), verify that r and s are
   6603      positive and less than q.
   6604      [Bodo Moeller]
   6605 
   6606   *) Don't change *pointer in CRYPTO_add_lock() is add_lock_callback is
   6607      used: it isn't thread safe and the add_lock_callback should handle
   6608      that itself.
   6609      [Paul Rose <Paul.Rose (a] bridge.com>]
   6610 
   6611   *) Verify that incoming data obeys the block size in
   6612      ssl3_enc (ssl/s3_enc.c) and tls1_enc (ssl/t1_enc.c).
   6613      [Bodo Moeller]
   6614 
   6615   *) Fix OAEP check.
   6616      [Ulf Mller, Bodo Mller]
   6617 
   6618   *) The countermeasure against Bleichbacher's attack on PKCS #1 v1.5
   6619      RSA encryption was accidentally removed in s3_srvr.c in OpenSSL 0.9.5
   6620      when fixing the server behaviour for backwards-compatible 'client
   6621      hello' messages.  (Note that the attack is impractical against
   6622      SSL 3.0 and TLS 1.0 anyway because length and version checking
   6623      means that the probability of guessing a valid ciphertext is
   6624      around 2^-40; see section 5 in Bleichenbacher's CRYPTO '98
   6625      paper.)
   6626 
   6627      Before 0.9.5, the countermeasure (hide the error by generating a
   6628      random 'decryption result') did not work properly because
   6629      ERR_clear_error() was missing, meaning that SSL_get_error() would
   6630      detect the supposedly ignored error.
   6631 
   6632      Both problems are now fixed.
   6633      [Bodo Moeller]
   6634 
   6635   *) In crypto/bio/bf_buff.c, increase DEFAULT_BUFFER_SIZE to 4096
   6636      (previously it was 1024).
   6637      [Bodo Moeller]
   6638 
   6639   *) Fix for compatibility mode trust settings: ignore trust settings
   6640      unless some valid trust or reject settings are present.
   6641      [Steve Henson]
   6642 
   6643   *) Fix for blowfish EVP: its a variable length cipher.
   6644      [Steve Henson]
   6645 
   6646   *) Fix various bugs related to DSA S/MIME verification. Handle missing
   6647      parameters in DSA public key structures and return an error in the
   6648      DSA routines if parameters are absent.
   6649      [Steve Henson]
   6650 
   6651   *) In versions up to 0.9.6, RAND_file_name() resorted to file ".rnd"
   6652      in the current directory if neither $RANDFILE nor $HOME was set.
   6653      RAND_file_name() in 0.9.6a returned NULL in this case.  This has
   6654      caused some confusion to Windows users who haven't defined $HOME.
   6655      Thus RAND_file_name() is changed again: e_os.h can define a
   6656      DEFAULT_HOME, which will be used if $HOME is not set.
   6657      For Windows, we use "C:"; on other platforms, we still require
   6658      environment variables.
   6659 
   6660   *) Move 'if (!initialized) RAND_poll()' into regions protected by
   6661      CRYPTO_LOCK_RAND.  This is not strictly necessary, but avoids
   6662      having multiple threads call RAND_poll() concurrently.
   6663      [Bodo Moeller]
   6664 
   6665   *) In crypto/rand/md_rand.c, replace 'add_do_not_lock' flag by a
   6666      combination of a flag and a thread ID variable.
   6667      Otherwise while one thread is in ssleay_rand_bytes (which sets the
   6668      flag), *other* threads can enter ssleay_add_bytes without obeying
   6669      the CRYPTO_LOCK_RAND lock (and may even illegally release the lock
   6670      that they do not hold after the first thread unsets add_do_not_lock).
   6671      [Bodo Moeller]
   6672 
   6673   *) Change bctest again: '-x' expressions are not available in all
   6674      versions of 'test'.
   6675      [Bodo Moeller]
   6676 
   6677  Changes between 0.9.6 and 0.9.6a  [5 Apr 2001]
   6678 
   6679   *) Fix a couple of memory leaks in PKCS7_dataDecode()
   6680      [Steve Henson, reported by Heyun Zheng <hzheng (a] atdsprint.com>]
   6681 
   6682   *) Change Configure and Makefiles to provide EXE_EXT, which will contain
   6683      the default extension for executables, if any.  Also, make the perl
   6684      scripts that use symlink() to test if it really exists and use "cp"
   6685      if it doesn't.  All this made OpenSSL compilable and installable in
   6686      CygWin.
   6687      [Richard Levitte]
   6688 
   6689   *) Fix for asn1_GetSequence() for indefinite length constructed data.
   6690      If SEQUENCE is length is indefinite just set c->slen to the total
   6691      amount of data available.
   6692      [Steve Henson, reported by shige (a] FreeBSD.org]
   6693      [This change does not apply to 0.9.7.]
   6694 
   6695   *) Change bctest to avoid here-documents inside command substitution
   6696      (workaround for FreeBSD /bin/sh bug).
   6697      For compatibility with Ultrix, avoid shell functions (introduced
   6698      in the bctest version that searches along $PATH).
   6699      [Bodo Moeller]
   6700 
   6701   *) Rename 'des_encrypt' to 'des_encrypt1'.  This avoids the clashes
   6702      with des_encrypt() defined on some operating systems, like Solaris
   6703      and UnixWare.
   6704      [Richard Levitte]
   6705 
   6706   *) Check the result of RSA-CRT (see D. Boneh, R. DeMillo, R. Lipton:
   6707      On the Importance of Eliminating Errors in Cryptographic
   6708      Computations, J. Cryptology 14 (2001) 2, 101-119,
   6709      http://theory.stanford.edu/~dabo/papers/faults.ps.gz).
   6710      [Ulf Moeller]
   6711   
   6712   *) MIPS assembler BIGNUM division bug fix. 
   6713      [Andy Polyakov]
   6714 
   6715   *) Disabled incorrect Alpha assembler code.
   6716      [Richard Levitte]
   6717 
   6718   *) Fix PKCS#7 decode routines so they correctly update the length
   6719      after reading an EOC for the EXPLICIT tag.
   6720      [Steve Henson]
   6721      [This change does not apply to 0.9.7.]
   6722 
   6723   *) Fix bug in PKCS#12 key generation routines. This was triggered
   6724      if a 3DES key was generated with a 0 initial byte. Include
   6725      PKCS12_BROKEN_KEYGEN compilation option to retain the old
   6726      (but broken) behaviour.
   6727      [Steve Henson]
   6728 
   6729   *) Enhance bctest to search for a working bc along $PATH and print
   6730      it when found.
   6731      [Tim Rice <tim (a] multitalents.net> via Richard Levitte]
   6732 
   6733   *) Fix memory leaks in err.c: free err_data string if necessary;
   6734      don't write to the wrong index in ERR_set_error_data.
   6735      [Bodo Moeller]
   6736 
   6737   *) Implement ssl23_peek (analogous to ssl23_read), which previously
   6738      did not exist.
   6739      [Bodo Moeller]
   6740 
   6741   *) Replace rdtsc with _emit statements for VC++ version 5.
   6742      [Jeremy Cooper <jeremy (a] baymoo.org>]
   6743 
   6744   *) Make it possible to reuse SSLv2 sessions.
   6745      [Richard Levitte]
   6746 
   6747   *) In copy_email() check for >= 0 as a return value for
   6748      X509_NAME_get_index_by_NID() since 0 is a valid index.
   6749      [Steve Henson reported by Massimiliano Pala <madwolf (a] opensca.org>]
   6750 
   6751   *) Avoid coredump with unsupported or invalid public keys by checking if
   6752      X509_get_pubkey() fails in PKCS7_verify(). Fix memory leak when
   6753      PKCS7_verify() fails with non detached data.
   6754      [Steve Henson]
   6755 
   6756   *) Don't use getenv in library functions when run as setuid/setgid.
   6757      New function OPENSSL_issetugid().
   6758      [Ulf Moeller]
   6759 
   6760   *) Avoid false positives in memory leak detection code (crypto/mem_dbg.c)
   6761      due to incorrect handling of multi-threading:
   6762 
   6763      1. Fix timing glitch in the MemCheck_off() portion of CRYPTO_mem_ctrl().
   6764 
   6765      2. Fix logical glitch in is_MemCheck_on() aka CRYPTO_is_mem_check_on().
   6766 
   6767      3. Count how many times MemCheck_off() has been called so that
   6768         nested use can be treated correctly.  This also avoids 
   6769         inband-signalling in the previous code (which relied on the
   6770         assumption that thread ID 0 is impossible).
   6771      [Bodo Moeller]
   6772 
   6773   *) Add "-rand" option also to s_client and s_server.
   6774      [Lutz Jaenicke]
   6775 
   6776   *) Fix CPU detection on Irix 6.x.
   6777      [Kurt Hockenbury <khockenb (a] stevens-tech.edu> and
   6778       "Bruce W. Forsberg" <bruce.forsberg (a] baesystems.com>]
   6779 
   6780   *) Fix X509_NAME bug which produced incorrect encoding if X509_NAME
   6781      was empty.
   6782      [Steve Henson]
   6783      [This change does not apply to 0.9.7.]
   6784 
   6785   *) Use the cached encoding of an X509_NAME structure rather than
   6786      copying it. This is apparently the reason for the libsafe "errors"
   6787      but the code is actually correct.
   6788      [Steve Henson]
   6789 
   6790   *) Add new function BN_rand_range(), and fix DSA_sign_setup() to prevent
   6791      Bleichenbacher's DSA attack.
   6792      Extend BN_[pseudo_]rand: As before, top=1 forces the highest two bits
   6793      to be set and top=0 forces the highest bit to be set; top=-1 is new
   6794      and leaves the highest bit random.
   6795      [Ulf Moeller, Bodo Moeller]
   6796 
   6797   *) In the NCONF_...-based implementations for CONF_... queries
   6798      (crypto/conf/conf_lib.c), if the input LHASH is NULL, avoid using
   6799      a temporary CONF structure with the data component set to NULL
   6800      (which gives segmentation faults in lh_retrieve).
   6801      Instead, use NULL for the CONF pointer in CONF_get_string and
   6802      CONF_get_number (which may use environment variables) and directly
   6803      return NULL from CONF_get_section.
   6804      [Bodo Moeller]
   6805 
   6806   *) Fix potential buffer overrun for EBCDIC.
   6807      [Ulf Moeller]
   6808 
   6809   *) Tolerate nonRepudiation as being valid for S/MIME signing and certSign
   6810      keyUsage if basicConstraints absent for a CA.
   6811      [Steve Henson]
   6812 
   6813   *) Make SMIME_write_PKCS7() write mail header values with a format that
   6814      is more generally accepted (no spaces before the semicolon), since
   6815      some programs can't parse those values properly otherwise.  Also make
   6816      sure BIO's that break lines after each write do not create invalid
   6817      headers.
   6818      [Richard Levitte]
   6819 
   6820   *) Make the CRL encoding routines work with empty SEQUENCE OF. The
   6821      macros previously used would not encode an empty SEQUENCE OF
   6822      and break the signature.
   6823      [Steve Henson]
   6824      [This change does not apply to 0.9.7.]
   6825 
   6826   *) Zero the premaster secret after deriving the master secret in
   6827      DH ciphersuites.
   6828      [Steve Henson]
   6829 
   6830   *) Add some EVP_add_digest_alias registrations (as found in
   6831      OpenSSL_add_all_digests()) to SSL_library_init()
   6832      aka OpenSSL_add_ssl_algorithms().  This provides improved
   6833      compatibility with peers using X.509 certificates
   6834      with unconventional AlgorithmIdentifier OIDs.
   6835      [Bodo Moeller]
   6836 
   6837   *) Fix for Irix with NO_ASM.
   6838      ["Bruce W. Forsberg" <bruce.forsberg (a] baesystems.com>]
   6839 
   6840   *) ./config script fixes.
   6841      [Ulf Moeller, Richard Levitte]
   6842 
   6843   *) Fix 'openssl passwd -1'.
   6844      [Bodo Moeller]
   6845 
   6846   *) Change PKCS12_key_gen_asc() so it can cope with non null
   6847      terminated strings whose length is passed in the passlen
   6848      parameter, for example from PEM callbacks. This was done
   6849      by adding an extra length parameter to asc2uni().
   6850      [Steve Henson, reported by <oddissey (a] samsung.co.kr>]
   6851 
   6852   *) Fix C code generated by 'openssl dsaparam -C': If a BN_bin2bn
   6853      call failed, free the DSA structure.
   6854      [Bodo Moeller]
   6855 
   6856   *) Fix to uni2asc() to cope with zero length Unicode strings.
   6857      These are present in some PKCS#12 files.
   6858      [Steve Henson]
   6859 
   6860   *) Increase s2->wbuf allocation by one byte in ssl2_new (ssl/s2_lib.c).
   6861      Otherwise do_ssl_write (ssl/s2_pkt.c) will write beyond buffer limits
   6862      when writing a 32767 byte record.
   6863      [Bodo Moeller; problem reported by Eric Day <eday (a] concentric.net>]
   6864 
   6865   *) In RSA_eay_public_{en,ed}crypt and RSA_eay_mod_exp (rsa_eay.c),
   6866      obtain lock CRYPTO_LOCK_RSA before setting rsa->_method_mod_{n,p,q}.
   6867 
   6868      (RSA objects have a reference count access to which is protected
   6869      by CRYPTO_LOCK_RSA [see rsa_lib.c, s3_srvr.c, ssl_cert.c, ssl_rsa.c],
   6870      so they are meant to be shared between threads.)
   6871      [Bodo Moeller, Geoff Thorpe; original patch submitted by
   6872      "Reddie, Steven" <Steven.Reddie (a] ca.com>]
   6873 
   6874   *) Fix a deadlock in CRYPTO_mem_leaks().
   6875      [Bodo Moeller]
   6876 
   6877   *) Use better test patterns in bntest.
   6878      [Ulf Mller]
   6879 
   6880   *) rand_win.c fix for Borland C.
   6881      [Ulf Mller]
   6882  
   6883   *) BN_rshift bugfix for n == 0.
   6884      [Bodo Moeller]
   6885 
   6886   *) Add a 'bctest' script that checks for some known 'bc' bugs
   6887      so that 'make test' does not abort just because 'bc' is broken.
   6888      [Bodo Moeller]
   6889 
   6890   *) Store verify_result within SSL_SESSION also for client side to
   6891      avoid potential security hole. (Re-used sessions on the client side
   6892      always resulted in verify_result==X509_V_OK, not using the original
   6893      result of the server certificate verification.)
   6894      [Lutz Jaenicke]
   6895 
   6896   *) Fix ssl3_pending: If the record in s->s3->rrec is not of type
   6897      SSL3_RT_APPLICATION_DATA, return 0.
   6898      Similarly, change ssl2_pending to return 0 if SSL_in_init(s) is true.
   6899      [Bodo Moeller]
   6900 
   6901   *) Fix SSL_peek:
   6902      Both ssl2_peek and ssl3_peek, which were totally broken in earlier
   6903      releases, have been re-implemented by renaming the previous
   6904      implementations of ssl2_read and ssl3_read to ssl2_read_internal
   6905      and ssl3_read_internal, respectively, and adding 'peek' parameters
   6906      to them.  The new ssl[23]_{read,peek} functions are calls to
   6907      ssl[23]_read_internal with the 'peek' flag set appropriately.
   6908      A 'peek' parameter has also been added to ssl3_read_bytes, which
   6909      does the actual work for ssl3_read_internal.
   6910      [Bodo Moeller]
   6911 
   6912   *) Initialise "ex_data" member of RSA/DSA/DH structures prior to calling
   6913      the method-specific "init()" handler. Also clean up ex_data after
   6914      calling the method-specific "finish()" handler. Previously, this was
   6915      happening the other way round.
   6916      [Geoff Thorpe]
   6917 
   6918   *) Increase BN_CTX_NUM (the number of BIGNUMs in a BN_CTX) to 16.
   6919      The previous value, 12, was not always sufficient for BN_mod_exp().
   6920      [Bodo Moeller]
   6921 
   6922   *) Make sure that shared libraries get the internal name engine with
   6923      the full version number and not just 0.  This should mark the
   6924      shared libraries as not backward compatible.  Of course, this should
   6925      be changed again when we can guarantee backward binary compatibility.
   6926      [Richard Levitte]
   6927 
   6928   *) Fix typo in get_cert_by_subject() in by_dir.c
   6929      [Jean-Marc Desperrier <jean-marc.desperrier (a] certplus.com>]
   6930 
   6931   *) Rework the system to generate shared libraries:
   6932 
   6933      - Make note of the expected extension for the shared libraries and
   6934        if there is a need for symbolic links from for example libcrypto.so.0
   6935        to libcrypto.so.0.9.7.  There is extended info in Configure for
   6936        that.
   6937 
   6938      - Make as few rebuilds of the shared libraries as possible.
   6939 
   6940      - Still avoid linking the OpenSSL programs with the shared libraries.
   6941 
   6942      - When installing, install the shared libraries separately from the
   6943        static ones.
   6944      [Richard Levitte]
   6945 
   6946   *) Fix SSL_CTX_set_read_ahead macro to actually use its argument.
   6947 
   6948      Copy SSL_CTX's read_ahead flag to SSL object directly in SSL_new
   6949      and not in SSL_clear because the latter is also used by the
   6950      accept/connect functions; previously, the settings made by
   6951      SSL_set_read_ahead would be lost during the handshake.
   6952      [Bodo Moeller; problems reported by Anders Gertz <gertz (a] epact.se>]     
   6953 
   6954   *) Correct util/mkdef.pl to be selective about disabled algorithms.
   6955      Previously, it would create entries for disableed algorithms no
   6956      matter what.
   6957      [Richard Levitte]
   6958 
   6959   *) Added several new manual pages for SSL_* function.
   6960      [Lutz Jaenicke]
   6961 
   6962  Changes between 0.9.5a and 0.9.6  [24 Sep 2000]
   6963 
   6964   *) In ssl23_get_client_hello, generate an error message when faced
   6965      with an initial SSL 3.0/TLS record that is too small to contain the
   6966      first two bytes of the ClientHello message, i.e. client_version.
   6967      (Note that this is a pathologic case that probably has never happened
   6968      in real life.)  The previous approach was to use the version number
   6969      from the record header as a substitute; but our protocol choice
   6970      should not depend on that one because it is not authenticated
   6971      by the Finished messages.
   6972      [Bodo Moeller]
   6973 
   6974   *) More robust randomness gathering functions for Windows.
   6975      [Jeffrey Altman <jaltman (a] columbia.edu>]
   6976 
   6977   *) For compatibility reasons if the flag X509_V_FLAG_ISSUER_CHECK is
   6978      not set then we don't setup the error code for issuer check errors
   6979      to avoid possibly overwriting other errors which the callback does
   6980      handle. If an application does set the flag then we assume it knows
   6981      what it is doing and can handle the new informational codes
   6982      appropriately.
   6983      [Steve Henson]
   6984 
   6985   *) Fix for a nasty bug in ASN1_TYPE handling. ASN1_TYPE is used for
   6986      a general "ANY" type, as such it should be able to decode anything
   6987      including tagged types. However it didn't check the class so it would
   6988      wrongly interpret tagged types in the same way as their universal
   6989      counterpart and unknown types were just rejected. Changed so that the
   6990      tagged and unknown types are handled in the same way as a SEQUENCE:
   6991      that is the encoding is stored intact. There is also a new type
   6992      "V_ASN1_OTHER" which is used when the class is not universal, in this
   6993      case we have no idea what the actual type is so we just lump them all
   6994      together.
   6995      [Steve Henson]
   6996 
   6997   *) On VMS, stdout may very well lead to a file that is written to
   6998      in a record-oriented fashion.  That means that every write() will
   6999      write a separate record, which will be read separately by the
   7000      programs trying to read from it.  This can be very confusing.
   7001 
   7002      The solution is to put a BIO filter in the way that will buffer
   7003      text until a linefeed is reached, and then write everything a
   7004      line at a time, so every record written will be an actual line,
   7005      not chunks of lines and not (usually doesn't happen, but I've
   7006      seen it once) several lines in one record.  BIO_f_linebuffer() is
   7007      the answer.
   7008 
   7009      Currently, it's a VMS-only method, because that's where it has
   7010      been tested well enough.
   7011      [Richard Levitte]
   7012 
   7013   *) Remove 'optimized' squaring variant in BN_mod_mul_montgomery,
   7014      it can return incorrect results.
   7015      (Note: The buggy variant was not enabled in OpenSSL 0.9.5a,
   7016      but it was in 0.9.6-beta[12].)
   7017      [Bodo Moeller]
   7018 
   7019   *) Disable the check for content being present when verifying detached
   7020      signatures in pk7_smime.c. Some versions of Netscape (wrongly)
   7021      include zero length content when signing messages.
   7022      [Steve Henson]
   7023 
   7024   *) New BIO_shutdown_wr macro, which invokes the BIO_C_SHUTDOWN_WR
   7025      BIO_ctrl (for BIO pairs).
   7026      [Bodo Mller]
   7027 
   7028   *) Add DSO method for VMS.
   7029      [Richard Levitte]
   7030 
   7031   *) Bug fix: Montgomery multiplication could produce results with the
   7032      wrong sign.
   7033      [Ulf Mller]
   7034 
   7035   *) Add RPM specification openssl.spec and modify it to build three
   7036      packages.  The default package contains applications, application
   7037      documentation and run-time libraries.  The devel package contains
   7038      include files, static libraries and function documentation.  The
   7039      doc package contains the contents of the doc directory.  The original
   7040      openssl.spec was provided by Damien Miller <djm (a] mindrot.org>.
   7041      [Richard Levitte]
   7042      
   7043   *) Add a large number of documentation files for many SSL routines.
   7044      [Lutz Jaenicke <Lutz.Jaenicke (a] aet.TU-Cottbus.DE>]
   7045 
   7046   *) Add a configuration entry for Sony News 4.
   7047      [NAKAJI Hiroyuki <nakaji (a] tutrp.tut.ac.jp>]
   7048 
   7049   *) Don't set the two most significant bits to one when generating a
   7050      random number < q in the DSA library.
   7051      [Ulf Mller]
   7052 
   7053   *) New SSL API mode 'SSL_MODE_AUTO_RETRY'.  This disables the default
   7054      behaviour that SSL_read may result in SSL_ERROR_WANT_READ (even if
   7055      the underlying transport is blocking) if a handshake took place.
   7056      (The default behaviour is needed by applications such as s_client
   7057      and s_server that use select() to determine when to use SSL_read;
   7058      but for applications that know in advance when to expect data, it
   7059      just makes things more complicated.)
   7060      [Bodo Moeller]
   7061 
   7062   *) Add RAND_egd_bytes(), which gives control over the number of bytes read
   7063      from EGD.
   7064      [Ben Laurie]
   7065 
   7066   *) Add a few more EBCDIC conditionals that make `req' and `x509'
   7067      work better on such systems.
   7068      [Martin Kraemer <Martin.Kraemer (a] MchP.Siemens.De>]
   7069 
   7070   *) Add two demo programs for PKCS12_parse() and PKCS12_create().
   7071      Update PKCS12_parse() so it copies the friendlyName and the
   7072      keyid to the certificates aux info.
   7073      [Steve Henson]
   7074 
   7075   *) Fix bug in PKCS7_verify() which caused an infinite loop
   7076      if there was more than one signature.
   7077      [Sven Uszpelkat <su (a] celocom.de>]
   7078 
   7079   *) Major change in util/mkdef.pl to include extra information
   7080      about each symbol, as well as presentig variables as well
   7081      as functions.  This change means that there's n more need
   7082      to rebuild the .num files when some algorithms are excluded.
   7083      [Richard Levitte]
   7084 
   7085   *) Allow the verify time to be set by an application,
   7086      rather than always using the current time.
   7087      [Steve Henson]
   7088   
   7089   *) Phase 2 verify code reorganisation. The certificate
   7090      verify code now looks up an issuer certificate by a
   7091      number of criteria: subject name, authority key id
   7092      and key usage. It also verifies self signed certificates
   7093      by the same criteria. The main comparison function is
   7094      X509_check_issued() which performs these checks.
   7095  
   7096      Lot of changes were necessary in order to support this
   7097      without completely rewriting the lookup code.
   7098  
   7099      Authority and subject key identifier are now cached.
   7100  
   7101      The LHASH 'certs' is X509_STORE has now been replaced
   7102      by a STACK_OF(X509_OBJECT). This is mainly because an
   7103      LHASH can't store or retrieve multiple objects with
   7104      the same hash value.
   7105 
   7106      As a result various functions (which were all internal
   7107      use only) have changed to handle the new X509_STORE
   7108      structure. This will break anything that messed round
   7109      with X509_STORE internally.
   7110  
   7111      The functions X509_STORE_add_cert() now checks for an
   7112      exact match, rather than just subject name.
   7113  
   7114      The X509_STORE API doesn't directly support the retrieval
   7115      of multiple certificates matching a given criteria, however
   7116      this can be worked round by performing a lookup first
   7117      (which will fill the cache with candidate certificates)
   7118      and then examining the cache for matches. This is probably
   7119      the best we can do without throwing out X509_LOOKUP
   7120      entirely (maybe later...).
   7121  
   7122      The X509_VERIFY_CTX structure has been enhanced considerably.
   7123  
   7124      All certificate lookup operations now go via a get_issuer()
   7125      callback. Although this currently uses an X509_STORE it
   7126      can be replaced by custom lookups. This is a simple way
   7127      to bypass the X509_STORE hackery necessary to make this
   7128      work and makes it possible to use more efficient techniques
   7129      in future. A very simple version which uses a simple
   7130      STACK for its trusted certificate store is also provided
   7131      using X509_STORE_CTX_trusted_stack().
   7132  
   7133      The verify_cb() and verify() callbacks now have equivalents
   7134      in the X509_STORE_CTX structure.
   7135  
   7136      X509_STORE_CTX also has a 'flags' field which can be used
   7137      to customise the verify behaviour.
   7138      [Steve Henson]
   7139  
   7140   *) Add new PKCS#7 signing option PKCS7_NOSMIMECAP which 
   7141      excludes S/MIME capabilities.
   7142      [Steve Henson]
   7143 
   7144   *) When a certificate request is read in keep a copy of the
   7145      original encoding of the signed data and use it when outputing
   7146      again. Signatures then use the original encoding rather than
   7147      a decoded, encoded version which may cause problems if the
   7148      request is improperly encoded.
   7149      [Steve Henson]
   7150 
   7151   *) For consistency with other BIO_puts implementations, call
   7152      buffer_write(b, ...) directly in buffer_puts instead of calling
   7153      BIO_write(b, ...).
   7154 
   7155      In BIO_puts, increment b->num_write as in BIO_write.
   7156      [Peter.Sylvester (a] EdelWeb.fr]
   7157 
   7158   *) Fix BN_mul_word for the case where the word is 0. (We have to use
   7159      BN_zero, we may not return a BIGNUM with an array consisting of
   7160      words set to zero.)
   7161      [Bodo Moeller]
   7162 
   7163   *) Avoid calling abort() from within the library when problems are
   7164      detected, except if preprocessor symbols have been defined
   7165      (such as REF_CHECK, BN_DEBUG etc.).
   7166      [Bodo Moeller]
   7167 
   7168   *) New openssl application 'rsautl'. This utility can be
   7169      used for low level RSA operations. DER public key
   7170      BIO/fp routines also added.
   7171      [Steve Henson]
   7172 
   7173   *) New Configure entry and patches for compiling on QNX 4.
   7174      [Andreas Schneider <andreas (a] ds3.etech.fh-hamburg.de>]
   7175 
   7176   *) A demo state-machine implementation was sponsored by
   7177      Nuron (http://www.nuron.com/) and is now available in
   7178      demos/state_machine.
   7179      [Ben Laurie]
   7180 
   7181   *) New options added to the 'dgst' utility for signature
   7182      generation and verification.
   7183      [Steve Henson]
   7184 
   7185   *) Unrecognized PKCS#7 content types are now handled via a
   7186      catch all ASN1_TYPE structure. This allows unsupported
   7187      types to be stored as a "blob" and an application can
   7188      encode and decode it manually.
   7189      [Steve Henson]
   7190 
   7191   *) Fix various signed/unsigned issues to make a_strex.c
   7192      compile under VC++.
   7193      [Oscar Jacobsson <oscar.jacobsson (a] celocom.com>]
   7194 
   7195   *) ASN1 fixes. i2d_ASN1_OBJECT was not returning the correct
   7196      length if passed a buffer. ASN1_INTEGER_to_BN failed
   7197      if passed a NULL BN and its argument was negative.
   7198      [Steve Henson, pointed out by Sven Heiberg <sven (a] tartu.cyber.ee>]
   7199 
   7200   *) Modification to PKCS#7 encoding routines to output definite
   7201      length encoding. Since currently the whole structures are in
   7202      memory there's not real point in using indefinite length 
   7203      constructed encoding. However if OpenSSL is compiled with
   7204      the flag PKCS7_INDEFINITE_ENCODING the old form is used.
   7205      [Steve Henson]
   7206 
   7207   *) Added BIO_vprintf() and BIO_vsnprintf().
   7208      [Richard Levitte]
   7209 
   7210   *) Added more prefixes to parse for in the the strings written
   7211      through a logging bio, to cover all the levels that are available
   7212      through syslog.  The prefixes are now:
   7213 
   7214 	PANIC, EMERG, EMR	=>	LOG_EMERG
   7215 	ALERT, ALR		=>	LOG_ALERT
   7216 	CRIT, CRI		=>	LOG_CRIT
   7217 	ERROR, ERR		=>	LOG_ERR
   7218 	WARNING, WARN, WAR	=>	LOG_WARNING
   7219 	NOTICE, NOTE, NOT	=>	LOG_NOTICE
   7220 	INFO, INF		=>	LOG_INFO
   7221 	DEBUG, DBG		=>	LOG_DEBUG
   7222 
   7223      and as before, if none of those prefixes are present at the
   7224      beginning of the string, LOG_ERR is chosen.
   7225 
   7226      On Win32, the LOG_* levels are mapped according to this:
   7227 
   7228 	LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR	=> EVENTLOG_ERROR_TYPE
   7229 	LOG_WARNING				=> EVENTLOG_WARNING_TYPE
   7230 	LOG_NOTICE, LOG_INFO, LOG_DEBUG		=> EVENTLOG_INFORMATION_TYPE
   7231 
   7232      [Richard Levitte]
   7233 
   7234   *) Made it possible to reconfigure with just the configuration
   7235      argument "reconf" or "reconfigure".  The command line arguments
   7236      are stored in Makefile.ssl in the variable CONFIGURE_ARGS,
   7237      and are retrieved from there when reconfiguring.
   7238      [Richard Levitte]
   7239 
   7240   *) MD4 implemented.
   7241      [Assar Westerlund <assar (a] sics.se>, Richard Levitte]
   7242 
   7243   *) Add the arguments -CAfile and -CApath to the pkcs12 utility.
   7244      [Richard Levitte]
   7245 
   7246   *) The obj_dat.pl script was messing up the sorting of object
   7247      names. The reason was that it compared the quoted version
   7248      of strings as a result "OCSP" > "OCSP Signing" because
   7249      " > SPACE. Changed script to store unquoted versions of
   7250      names and add quotes on output. It was also omitting some
   7251      names from the lookup table if they were given a default
   7252      value (that is if SN is missing it is given the same
   7253      value as LN and vice versa), these are now added on the
   7254      grounds that if an object has a name we should be able to
   7255      look it up. Finally added warning output when duplicate
   7256      short or long names are found.
   7257      [Steve Henson]
   7258 
   7259   *) Changes needed for Tandem NSK.
   7260      [Scott Uroff <scott (a] xypro.com>]
   7261 
   7262   *) Fix SSL 2.0 rollback checking: Due to an off-by-one error in
   7263      RSA_padding_check_SSLv23(), special padding was never detected
   7264      and thus the SSL 3.0/TLS 1.0 countermeasure against protocol
   7265      version rollback attacks was not effective.
   7266 
   7267      In s23_clnt.c, don't use special rollback-attack detection padding
   7268      (RSA_SSLV23_PADDING) if SSL 2.0 is the only protocol enabled in the
   7269      client; similarly, in s23_srvr.c, don't do the rollback check if
   7270      SSL 2.0 is the only protocol enabled in the server.
   7271      [Bodo Moeller]
   7272 
   7273   *) Make it possible to get hexdumps of unprintable data with 'openssl
   7274      asn1parse'.  By implication, the functions ASN1_parse_dump() and
   7275      BIO_dump_indent() are added.
   7276      [Richard Levitte]
   7277 
   7278   *) New functions ASN1_STRING_print_ex() and X509_NAME_print_ex()
   7279      these print out strings and name structures based on various
   7280      flags including RFC2253 support and proper handling of
   7281      multibyte characters. Added options to the 'x509' utility 
   7282      to allow the various flags to be set.
   7283      [Steve Henson]
   7284 
   7285   *) Various fixes to use ASN1_TIME instead of ASN1_UTCTIME.
   7286      Also change the functions X509_cmp_current_time() and
   7287      X509_gmtime_adj() work with an ASN1_TIME structure,
   7288      this will enable certificates using GeneralizedTime in validity
   7289      dates to be checked.
   7290      [Steve Henson]
   7291 
   7292   *) Make the NEG_PUBKEY_BUG code (which tolerates invalid
   7293      negative public key encodings) on by default,
   7294      NO_NEG_PUBKEY_BUG can be set to disable it.
   7295      [Steve Henson]
   7296 
   7297   *) New function c2i_ASN1_OBJECT() which acts on ASN1_OBJECT
   7298      content octets. An i2c_ASN1_OBJECT is unnecessary because
   7299      the encoding can be trivially obtained from the structure.
   7300      [Steve Henson]
   7301 
   7302   *) crypto/err.c locking bugfix: Use write locks (CRYPTO_w_[un]lock),
   7303      not read locks (CRYPTO_r_[un]lock).
   7304      [Bodo Moeller]
   7305 
   7306   *) A first attempt at creating official support for shared
   7307      libraries through configuration.  I've kept it so the
   7308      default is static libraries only, and the OpenSSL programs
   7309      are always statically linked for now, but there are
   7310      preparations for dynamic linking in place.
   7311      This has been tested on Linux and Tru64.
   7312      [Richard Levitte]
   7313 
   7314   *) Randomness polling function for Win9x, as described in:
   7315      Peter Gutmann, Software Generation of Practically Strong
   7316      Random Numbers.
   7317      [Ulf Mller]
   7318 
   7319   *) Fix so PRNG is seeded in req if using an already existing
   7320      DSA key.
   7321      [Steve Henson]
   7322 
   7323   *) New options to smime application. -inform and -outform
   7324      allow alternative formats for the S/MIME message including
   7325      PEM and DER. The -content option allows the content to be
   7326      specified separately. This should allow things like Netscape
   7327      form signing output easier to verify.
   7328      [Steve Henson]
   7329 
   7330   *) Fix the ASN1 encoding of tags using the 'long form'.
   7331      [Steve Henson]
   7332 
   7333   *) New ASN1 functions, i2c_* and c2i_* for INTEGER and BIT
   7334      STRING types. These convert content octets to and from the
   7335      underlying type. The actual tag and length octets are
   7336      already assumed to have been read in and checked. These
   7337      are needed because all other string types have virtually
   7338      identical handling apart from the tag. By having versions
   7339      of the ASN1 functions that just operate on content octets
   7340      IMPLICIT tagging can be handled properly. It also allows
   7341      the ASN1_ENUMERATED code to be cut down because ASN1_ENUMERATED
   7342      and ASN1_INTEGER are identical apart from the tag.
   7343      [Steve Henson]
   7344 
   7345   *) Change the handling of OID objects as follows:
   7346 
   7347      - New object identifiers are inserted in objects.txt, following
   7348        the syntax given in objects.README.
   7349      - objects.pl is used to process obj_mac.num and create a new
   7350        obj_mac.h.
   7351      - obj_dat.pl is used to create a new obj_dat.h, using the data in
   7352        obj_mac.h.
   7353 
   7354      This is currently kind of a hack, and the perl code in objects.pl
   7355      isn't very elegant, but it works as I intended.  The simplest way
   7356      to check that it worked correctly is to look in obj_dat.h and
   7357      check the array nid_objs and make sure the objects haven't moved
   7358      around (this is important!).  Additions are OK, as well as
   7359      consistent name changes. 
   7360      [Richard Levitte]
   7361 
   7362   *) Add BSD-style MD5-based passwords to 'openssl passwd' (option '-1').
   7363      [Bodo Moeller]
   7364 
   7365   *) Addition of the command line parameter '-rand file' to 'openssl req'.
   7366      The given file adds to whatever has already been seeded into the
   7367      random pool through the RANDFILE configuration file option or
   7368      environment variable, or the default random state file.
   7369      [Richard Levitte]
   7370 
   7371   *) mkstack.pl now sorts each macro group into lexical order.
   7372      Previously the output order depended on the order the files
   7373      appeared in the directory, resulting in needless rewriting
   7374      of safestack.h .
   7375      [Steve Henson]
   7376 
   7377   *) Patches to make OpenSSL compile under Win32 again. Mostly
   7378      work arounds for the VC++ problem that it treats func() as
   7379      func(void). Also stripped out the parts of mkdef.pl that
   7380      added extra typesafe functions: these no longer exist.
   7381      [Steve Henson]
   7382 
   7383   *) Reorganisation of the stack code. The macros are now all 
   7384      collected in safestack.h . Each macro is defined in terms of
   7385      a "stack macro" of the form SKM_<name>(type, a, b). The 
   7386      DEBUG_SAFESTACK is now handled in terms of function casts,
   7387      this has the advantage of retaining type safety without the
   7388      use of additional functions. If DEBUG_SAFESTACK is not defined
   7389      then the non typesafe macros are used instead. Also modified the
   7390      mkstack.pl script to handle the new form. Needs testing to see
   7391      if which (if any) compilers it chokes and maybe make DEBUG_SAFESTACK
   7392      the default if no major problems. Similar behaviour for ASN1_SET_OF
   7393      and PKCS12_STACK_OF.
   7394      [Steve Henson]
   7395 
   7396   *) When some versions of IIS use the 'NET' form of private key the
   7397      key derivation algorithm is different. Normally MD5(password) is
   7398      used as a 128 bit RC4 key. In the modified case
   7399      MD5(MD5(password) + "SGCKEYSALT")  is used insted. Added some
   7400      new functions i2d_RSA_NET(), d2i_RSA_NET() etc which are the same
   7401      as the old Netscape_RSA functions except they have an additional
   7402      'sgckey' parameter which uses the modified algorithm. Also added
   7403      an -sgckey command line option to the rsa utility. Thanks to 
   7404      Adrian Peck <bertie (a] ncipher.com> for posting details of the modified
   7405      algorithm to openssl-dev.
   7406      [Steve Henson]
   7407 
   7408   *) The evp_local.h macros were using 'c.##kname' which resulted in
   7409      invalid expansion on some systems (SCO 5.0.5 for example).
   7410      Corrected to 'c.kname'.
   7411      [Phillip Porch <root (a] theporch.com>]
   7412 
   7413   *) New X509_get1_email() and X509_REQ_get1_email() functions that return
   7414      a STACK of email addresses from a certificate or request, these look
   7415      in the subject name and the subject alternative name extensions and 
   7416      omit any duplicate addresses.
   7417      [Steve Henson]
   7418 
   7419   *) Re-implement BN_mod_exp2_mont using independent (and larger) windows.
   7420      This makes DSA verification about 2 % faster.
   7421      [Bodo Moeller]
   7422 
   7423   *) Increase maximum window size in BN_mod_exp_... to 6 bits instead of 5
   7424      (meaning that now 2^5 values will be precomputed, which is only 4 KB
   7425      plus overhead for 1024 bit moduli).
   7426      This makes exponentiations about 0.5 % faster for 1024 bit
   7427      exponents (as measured by "openssl speed rsa2048").
   7428      [Bodo Moeller]
   7429 
   7430   *) Rename memory handling macros to avoid conflicts with other
   7431      software:
   7432           Malloc         =>  OPENSSL_malloc
   7433           Malloc_locked  =>  OPENSSL_malloc_locked
   7434           Realloc        =>  OPENSSL_realloc
   7435           Free           =>  OPENSSL_free
   7436      [Richard Levitte]
   7437 
   7438   *) New function BN_mod_exp_mont_word for small bases (roughly 15%
   7439      faster than BN_mod_exp_mont, i.e. 7% for a full DH exchange).
   7440      [Bodo Moeller]
   7441 
   7442   *) CygWin32 support.
   7443      [John Jarvie <jjarvie (a] newsguy.com>]
   7444 
   7445   *) The type-safe stack code has been rejigged. It is now only compiled
   7446      in when OpenSSL is configured with the DEBUG_SAFESTACK option and
   7447      by default all type-specific stack functions are "#define"d back to
   7448      standard stack functions. This results in more streamlined output
   7449      but retains the type-safety checking possibilities of the original
   7450      approach.
   7451      [Geoff Thorpe]
   7452 
   7453   *) The STACK code has been cleaned up, and certain type declarations
   7454      that didn't make a lot of sense have been brought in line. This has
   7455      also involved a cleanup of sorts in safestack.h to more correctly
   7456      map type-safe stack functions onto their plain stack counterparts.
   7457      This work has also resulted in a variety of "const"ifications of
   7458      lots of the code, especially "_cmp" operations which should normally
   7459      be prototyped with "const" parameters anyway.
   7460      [Geoff Thorpe]
   7461 
   7462   *) When generating bytes for the first time in md_rand.c, 'stir the pool'
   7463      by seeding with STATE_SIZE dummy bytes (with zero entropy count).
   7464      (The PRNG state consists of two parts, the large pool 'state' and 'md',
   7465      where all of 'md' is used each time the PRNG is used, but 'state'
   7466      is used only indexed by a cyclic counter. As entropy may not be
   7467      well distributed from the beginning, 'md' is important as a
   7468      chaining variable. However, the output function chains only half
   7469      of 'md', i.e. 80 bits.  ssleay_rand_add, on the other hand, chains
   7470      all of 'md', and seeding with STATE_SIZE dummy bytes will result
   7471      in all of 'state' being rewritten, with the new values depending
   7472      on virtually all of 'md'.  This overcomes the 80 bit limitation.)
   7473      [Bodo Moeller]
   7474 
   7475   *) In ssl/s2_clnt.c and ssl/s3_clnt.c, call ERR_clear_error() when
   7476      the handshake is continued after ssl_verify_cert_chain();
   7477      otherwise, if SSL_VERIFY_NONE is set, remaining error codes
   7478      can lead to 'unexplainable' connection aborts later.
   7479      [Bodo Moeller; problem tracked down by Lutz Jaenicke]
   7480 
   7481   *) Major EVP API cipher revision.
   7482      Add hooks for extra EVP features. This allows various cipher
   7483      parameters to be set in the EVP interface. Support added for variable
   7484      key length ciphers via the EVP_CIPHER_CTX_set_key_length() function and
   7485      setting of RC2 and RC5 parameters.
   7486 
   7487      Modify EVP_OpenInit() and EVP_SealInit() to cope with variable key length
   7488      ciphers.
   7489 
   7490      Remove lots of duplicated code from the EVP library. For example *every*
   7491      cipher init() function handles the 'iv' in the same way according to the
   7492      cipher mode. They also all do nothing if the 'key' parameter is NULL and
   7493      for CFB and OFB modes they zero ctx->num.
   7494 
   7495      New functionality allows removal of S/MIME code RC2 hack.
   7496 
   7497      Most of the routines have the same form and so can be declared in terms
   7498      of macros.
   7499 
   7500      By shifting this to the top level EVP_CipherInit() it can be removed from
   7501      all individual ciphers. If the cipher wants to handle IVs or keys
   7502      differently it can set the EVP_CIPH_CUSTOM_IV or EVP_CIPH_ALWAYS_CALL_INIT
   7503      flags.
   7504 
   7505      Change lots of functions like EVP_EncryptUpdate() to now return a
   7506      value: although software versions of the algorithms cannot fail
   7507      any installed hardware versions can.
   7508      [Steve Henson]
   7509 
   7510   *) Implement SSL_OP_TLS_ROLLBACK_BUG: In ssl3_get_client_key_exchange, if
   7511      this option is set, tolerate broken clients that send the negotiated
   7512      protocol version number instead of the requested protocol version
   7513      number.
   7514      [Bodo Moeller]
   7515 
   7516   *) Call dh_tmp_cb (set by ..._TMP_DH_CB) with correct 'is_export' flag;
   7517      i.e. non-zero for export ciphersuites, zero otherwise.
   7518      Previous versions had this flag inverted, inconsistent with
   7519      rsa_tmp_cb (..._TMP_RSA_CB).
   7520      [Bodo Moeller; problem reported by Amit Chopra]
   7521 
   7522   *) Add missing DSA library text string. Work around for some IIS
   7523      key files with invalid SEQUENCE encoding.
   7524      [Steve Henson]
   7525 
   7526   *) Add a document (doc/standards.txt) that list all kinds of standards
   7527      and so on that are implemented in OpenSSL.
   7528      [Richard Levitte]
   7529 
   7530   *) Enhance c_rehash script. Old version would mishandle certificates
   7531      with the same subject name hash and wouldn't handle CRLs at all.
   7532      Added -fingerprint option to crl utility, to support new c_rehash
   7533      features.
   7534      [Steve Henson]
   7535 
   7536   *) Eliminate non-ANSI declarations in crypto.h and stack.h.
   7537      [Ulf Mller]
   7538 
   7539   *) Fix for SSL server purpose checking. Server checking was
   7540      rejecting certificates which had extended key usage present
   7541      but no ssl client purpose.
   7542      [Steve Henson, reported by Rene Grosser <grosser (a] hisolutions.com>]
   7543 
   7544   *) Make PKCS#12 code work with no password. The PKCS#12 spec
   7545      is a little unclear about how a blank password is handled.
   7546      Since the password in encoded as a BMPString with terminating
   7547      double NULL a zero length password would end up as just the
   7548      double NULL. However no password at all is different and is
   7549      handled differently in the PKCS#12 key generation code. NS
   7550      treats a blank password as zero length. MSIE treats it as no
   7551      password on export: but it will try both on import. We now do
   7552      the same: PKCS12_parse() tries zero length and no password if
   7553      the password is set to "" or NULL (NULL is now a valid password:
   7554      it wasn't before) as does the pkcs12 application.
   7555      [Steve Henson]
   7556 
   7557   *) Bugfixes in apps/x509.c: Avoid a memory leak; and don't use
   7558      perror when PEM_read_bio_X509_REQ fails, the error message must
   7559      be obtained from the error queue.
   7560      [Bodo Moeller]
   7561 
   7562   *) Avoid 'thread_hash' memory leak in crypto/err/err.c by freeing
   7563      it in ERR_remove_state if appropriate, and change ERR_get_state
   7564      accordingly to avoid race conditions (this is necessary because
   7565      thread_hash is no longer constant once set).
   7566      [Bodo Moeller]
   7567 
   7568   *) Bugfix for linux-elf makefile.one.
   7569      [Ulf Mller]
   7570 
   7571   *) RSA_get_default_method() will now cause a default
   7572      RSA_METHOD to be chosen if one doesn't exist already.
   7573      Previously this was only set during a call to RSA_new()
   7574      or RSA_new_method(NULL) meaning it was possible for
   7575      RSA_get_default_method() to return NULL.
   7576      [Geoff Thorpe]
   7577 
   7578   *) Added native name translation to the existing DSO code
   7579      that will convert (if the flag to do so is set) filenames
   7580      that are sufficiently small and have no path information
   7581      into a canonical native form. Eg. "blah" converted to
   7582      "libblah.so" or "blah.dll" etc.
   7583      [Geoff Thorpe]
   7584 
   7585   *) New function ERR_error_string_n(e, buf, len) which is like
   7586      ERR_error_string(e, buf), but writes at most 'len' bytes
   7587      including the 0 terminator.  For ERR_error_string_n, 'buf'
   7588      may not be NULL.
   7589      [Damien Miller <djm (a] mindrot.org>, Bodo Moeller]
   7590 
   7591   *) CONF library reworked to become more general.  A new CONF
   7592      configuration file reader "class" is implemented as well as a
   7593      new functions (NCONF_*, for "New CONF") to handle it.  The now
   7594      old CONF_* functions are still there, but are reimplemented to
   7595      work in terms of the new functions.  Also, a set of functions
   7596      to handle the internal storage of the configuration data is
   7597      provided to make it easier to write new configuration file
   7598      reader "classes" (I can definitely see something reading a
   7599      configuration file in XML format, for example), called _CONF_*,
   7600      or "the configuration storage API"...
   7601 
   7602      The new configuration file reading functions are:
   7603 
   7604         NCONF_new, NCONF_free, NCONF_load, NCONF_load_fp, NCONF_load_bio,
   7605         NCONF_get_section, NCONF_get_string, NCONF_get_numbre
   7606 
   7607         NCONF_default, NCONF_WIN32
   7608 
   7609         NCONF_dump_fp, NCONF_dump_bio
   7610 
   7611      NCONF_default and NCONF_WIN32 are method (or "class") choosers,
   7612      NCONF_new creates a new CONF object.  This works in the same way
   7613      as other interfaces in OpenSSL, like the BIO interface.
   7614      NCONF_dump_* dump the internal storage of the configuration file,
   7615      which is useful for debugging.  All other functions take the same
   7616      arguments as the old CONF_* functions wth the exception of the
   7617      first that must be a `CONF *' instead of a `LHASH *'.
   7618 
   7619      To make it easer to use the new classes with the old CONF_* functions,
   7620      the function CONF_set_default_method is provided.
   7621      [Richard Levitte]
   7622 
   7623   *) Add '-tls1' option to 'openssl ciphers', which was already
   7624      mentioned in the documentation but had not been implemented.
   7625      (This option is not yet really useful because even the additional
   7626      experimental TLS 1.0 ciphers are currently treated as SSL 3.0 ciphers.)
   7627      [Bodo Moeller]
   7628 
   7629   *) Initial DSO code added into libcrypto for letting OpenSSL (and
   7630      OpenSSL-based applications) load shared libraries and bind to
   7631      them in a portable way.
   7632      [Geoff Thorpe, with contributions from Richard Levitte]
   7633 
   7634  Changes between 0.9.5 and 0.9.5a  [1 Apr 2000]
   7635 
   7636   *) Make sure _lrotl and _lrotr are only used with MSVC.
   7637 
   7638   *) Use lock CRYPTO_LOCK_RAND correctly in ssleay_rand_status
   7639      (the default implementation of RAND_status).
   7640 
   7641   *) Rename openssl x509 option '-crlext', which was added in 0.9.5,
   7642      to '-clrext' (= clear extensions), as intended and documented.
   7643      [Bodo Moeller; inconsistency pointed out by Michael Attili
   7644      <attili (a] amaxo.com>]
   7645 
   7646   *) Fix for HMAC. It wasn't zeroing the rest of the block if the key length
   7647      was larger than the MD block size.      
   7648      [Steve Henson, pointed out by Yost William <YostW (a] tce.com>]
   7649 
   7650   *) Modernise PKCS12_parse() so it uses STACK_OF(X509) for its ca argument
   7651      fix a leak when the ca argument was passed as NULL. Stop X509_PUBKEY_set()
   7652      using the passed key: if the passed key was a private key the result
   7653      of X509_print(), for example, would be to print out all the private key
   7654      components.
   7655      [Steve Henson]
   7656 
   7657   *) des_quad_cksum() byte order bug fix.
   7658      [Ulf Mller, using the problem description in krb4-0.9.7, where
   7659       the solution is attributed to Derrick J Brashear <shadow (a] DEMENTIA.ORG>]
   7660 
   7661   *) Fix so V_ASN1_APP_CHOOSE works again: however its use is strongly
   7662      discouraged.
   7663      [Steve Henson, pointed out by Brian Korver <briank (a] cs.stanford.edu>]
   7664 
   7665   *) For easily testing in shell scripts whether some command
   7666      'openssl XXX' exists, the new pseudo-command 'openssl no-XXX'
   7667      returns with exit code 0 iff no command of the given name is available.
   7668      'no-XXX' is printed in this case, 'XXX' otherwise.  In both cases,
   7669      the output goes to stdout and nothing is printed to stderr.
   7670      Additional arguments are always ignored.
   7671 
   7672      Since for each cipher there is a command of the same name,
   7673      the 'no-cipher' compilation switches can be tested this way.
   7674 
   7675      ('openssl no-XXX' is not able to detect pseudo-commands such
   7676      as 'quit', 'list-XXX-commands', or 'no-XXX' itself.)
   7677      [Bodo Moeller]
   7678 
   7679   *) Update test suite so that 'make test' succeeds in 'no-rsa' configuration.
   7680      [Bodo Moeller]
   7681 
   7682   *) For SSL_[CTX_]set_tmp_dh, don't create a DH key if SSL_OP_SINGLE_DH_USE
   7683      is set; it will be thrown away anyway because each handshake creates
   7684      its own key.
   7685      ssl_cert_dup, which is used by SSL_new, now copies DH keys in addition
   7686      to parameters -- in previous versions (since OpenSSL 0.9.3) the
   7687      'default key' from SSL_CTX_set_tmp_dh would always be lost, meanining
   7688      you effectivly got SSL_OP_SINGLE_DH_USE when using this macro.
   7689      [Bodo Moeller]
   7690 
   7691   *) New s_client option -ign_eof: EOF at stdin is ignored, and
   7692      'Q' and 'R' lose their special meanings (quit/renegotiate).
   7693      This is part of what -quiet does; unlike -quiet, -ign_eof
   7694      does not suppress any output.
   7695      [Richard Levitte]
   7696 
   7697   *) Add compatibility options to the purpose and trust code. The
   7698      purpose X509_PURPOSE_ANY is "any purpose" which automatically
   7699      accepts a certificate or CA, this was the previous behaviour,
   7700      with all the associated security issues.
   7701 
   7702      X509_TRUST_COMPAT is the old trust behaviour: only and
   7703      automatically trust self signed roots in certificate store. A
   7704      new trust setting X509_TRUST_DEFAULT is used to specify that
   7705      a purpose has no associated trust setting and it should instead
   7706      use the value in the default purpose.
   7707      [Steve Henson]
   7708 
   7709   *) Fix the PKCS#8 DSA private key code so it decodes keys again
   7710      and fix a memory leak.
   7711      [Steve Henson]
   7712 
   7713   *) In util/mkerr.pl (which implements 'make errors'), preserve
   7714      reason strings from the previous version of the .c file, as
   7715      the default to have only downcase letters (and digits) in
   7716      automatically generated reasons codes is not always appropriate.
   7717      [Bodo Moeller]
   7718 
   7719   *) In ERR_load_ERR_strings(), build an ERR_LIB_SYS error reason table
   7720      using strerror.  Previously, ERR_reason_error_string() returned
   7721      library names as reason strings for SYSerr; but SYSerr is a special
   7722      case where small numbers are errno values, not library numbers.
   7723      [Bodo Moeller]
   7724 
   7725   *) Add '-dsaparam' option to 'openssl dhparam' application.  This
   7726      converts DSA parameters into DH parameters. (When creating parameters,
   7727      DSA_generate_parameters is used.)
   7728      [Bodo Moeller]
   7729 
   7730   *) Include 'length' (recommended exponent length) in C code generated
   7731      by 'openssl dhparam -C'.
   7732      [Bodo Moeller]
   7733 
   7734   *) The second argument to set_label in perlasm was already being used
   7735      so couldn't be used as a "file scope" flag. Moved to third argument
   7736      which was free.
   7737      [Steve Henson]
   7738 
   7739   *) In PEM_ASN1_write_bio and some other functions, use RAND_pseudo_bytes
   7740      instead of RAND_bytes for encryption IVs and salts.
   7741      [Bodo Moeller]
   7742 
   7743   *) Include RAND_status() into RAND_METHOD instead of implementing
   7744      it only for md_rand.c  Otherwise replacing the PRNG by calling
   7745      RAND_set_rand_method would be impossible.
   7746      [Bodo Moeller]
   7747 
   7748   *) Don't let DSA_generate_key() enter an infinite loop if the random
   7749      number generation fails.
   7750      [Bodo Moeller]
   7751 
   7752   *) New 'rand' application for creating pseudo-random output.
   7753      [Bodo Moeller]
   7754 
   7755   *) Added configuration support for Linux/IA64
   7756      [Rolf Haberrecker <rolf (a] suse.de>]
   7757 
   7758   *) Assembler module support for Mingw32.
   7759      [Ulf Mller]
   7760 
   7761   *) Shared library support for HPUX (in shlib/).
   7762      [Lutz Jaenicke <Lutz.Jaenicke (a] aet.TU-Cottbus.DE> and Anonymous]
   7763 
   7764   *) Shared library support for Solaris gcc.
   7765      [Lutz Behnke <behnke (a] trustcenter.de>]
   7766 
   7767  Changes between 0.9.4 and 0.9.5  [28 Feb 2000]
   7768 
   7769   *) PKCS7_encrypt() was adding text MIME headers twice because they
   7770      were added manually and by SMIME_crlf_copy().
   7771      [Steve Henson]
   7772 
   7773   *) In bntest.c don't call BN_rand with zero bits argument.
   7774      [Steve Henson, pointed out by Andrew W. Gray <agray (a] iconsinc.com>]
   7775 
   7776   *) BN_mul bugfix: In bn_mul_part_recursion() only the a>a[n] && b>b[n]
   7777      case was implemented. This caused BN_div_recp() to fail occasionally.
   7778      [Ulf Mller]
   7779 
   7780   *) Add an optional second argument to the set_label() in the perl
   7781      assembly language builder. If this argument exists and is set
   7782      to 1 it signals that the assembler should use a symbol whose 
   7783      scope is the entire file, not just the current function. This
   7784      is needed with MASM which uses the format label:: for this scope.
   7785      [Steve Henson, pointed out by Peter Runestig <peter (a] runestig.com>]
   7786 
   7787   *) Change the ASN1 types so they are typedefs by default. Before
   7788      almost all types were #define'd to ASN1_STRING which was causing
   7789      STACK_OF() problems: you couldn't declare STACK_OF(ASN1_UTF8STRING)
   7790      for example.
   7791      [Steve Henson]
   7792 
   7793   *) Change names of new functions to the new get1/get0 naming
   7794      convention: After 'get1', the caller owns a reference count
   7795      and has to call ..._free; 'get0' returns a pointer to some
   7796      data structure without incrementing reference counters.
   7797      (Some of the existing 'get' functions increment a reference
   7798      counter, some don't.)
   7799      Similarly, 'set1' and 'add1' functions increase reference
   7800      counters or duplicate objects.
   7801      [Steve Henson]
   7802 
   7803   *) Allow for the possibility of temp RSA key generation failure:
   7804      the code used to assume it always worked and crashed on failure.
   7805      [Steve Henson]
   7806 
   7807   *) Fix potential buffer overrun problem in BIO_printf().
   7808      [Ulf Mller, using public domain code by Patrick Powell; problem
   7809       pointed out by David Sacerdote <das33 (a] cornell.edu>]
   7810 
   7811   *) Support EGD <http://www.lothar.com/tech/crypto/>.  New functions
   7812      RAND_egd() and RAND_status().  In the command line application,
   7813      the EGD socket can be specified like a seed file using RANDFILE
   7814      or -rand.
   7815      [Ulf Mller]
   7816 
   7817   *) Allow the string CERTIFICATE to be tolerated in PKCS#7 structures.
   7818      Some CAs (e.g. Verisign) distribute certificates in this form.
   7819      [Steve Henson]
   7820 
   7821   *) Remove the SSL_ALLOW_ADH compile option and set the default cipher
   7822      list to exclude them. This means that no special compilation option
   7823      is needed to use anonymous DH: it just needs to be included in the
   7824      cipher list.
   7825      [Steve Henson]
   7826 
   7827   *) Change the EVP_MD_CTX_type macro so its meaning consistent with
   7828      EVP_MD_type. The old functionality is available in a new macro called
   7829      EVP_MD_md(). Change code that uses it and update docs.
   7830      [Steve Henson]
   7831 
   7832   *) ..._ctrl functions now have corresponding ..._callback_ctrl functions
   7833      where the 'void *' argument is replaced by a function pointer argument.
   7834      Previously 'void *' was abused to point to functions, which works on
   7835      many platforms, but is not correct.  As these functions are usually
   7836      called by macros defined in OpenSSL header files, most source code
   7837      should work without changes.
   7838      [Richard Levitte]
   7839 
   7840   *) <openssl/opensslconf.h> (which is created by Configure) now contains
   7841      sections with information on -D... compiler switches used for
   7842      compiling the library so that applications can see them.  To enable
   7843      one of these sections, a pre-processor symbol OPENSSL_..._DEFINES
   7844      must be defined.  E.g.,
   7845         #define OPENSSL_ALGORITHM_DEFINES
   7846         #include <openssl/opensslconf.h>
   7847      defines all pertinent NO_<algo> symbols, such as NO_IDEA, NO_RSA, etc.
   7848      [Richard Levitte, Ulf and Bodo Mller]
   7849 
   7850   *) Bugfix: Tolerate fragmentation and interleaving in the SSL 3/TLS
   7851      record layer.
   7852      [Bodo Moeller]
   7853 
   7854   *) Change the 'other' type in certificate aux info to a STACK_OF
   7855      X509_ALGOR. Although not an AlgorithmIdentifier as such it has
   7856      the required ASN1 format: arbitrary types determined by an OID.
   7857      [Steve Henson]
   7858 
   7859   *) Add some PEM_write_X509_REQ_NEW() functions and a command line
   7860      argument to 'req'. This is not because the function is newer or
   7861      better than others it just uses the work 'NEW' in the certificate
   7862      request header lines. Some software needs this.
   7863      [Steve Henson]
   7864 
   7865   *) Reorganise password command line arguments: now passwords can be
   7866      obtained from various sources. Delete the PEM_cb function and make
   7867      it the default behaviour: i.e. if the callback is NULL and the
   7868      usrdata argument is not NULL interpret it as a null terminated pass
   7869      phrase. If usrdata and the callback are NULL then the pass phrase
   7870      is prompted for as usual.
   7871      [Steve Henson]
   7872 
   7873   *) Add support for the Compaq Atalla crypto accelerator. If it is installed,
   7874      the support is automatically enabled. The resulting binaries will
   7875      autodetect the card and use it if present.
   7876      [Ben Laurie and Compaq Inc.]
   7877 
   7878   *) Work around for Netscape hang bug. This sends certificate request
   7879      and server done in one record. Since this is perfectly legal in the
   7880      SSL/TLS protocol it isn't a "bug" option and is on by default. See
   7881      the bugs/SSLv3 entry for more info.
   7882      [Steve Henson]
   7883 
   7884   *) HP-UX tune-up: new unified configs, HP C compiler bug workaround.
   7885      [Andy Polyakov]
   7886 
   7887   *) Add -rand argument to smime and pkcs12 applications and read/write
   7888      of seed file.
   7889      [Steve Henson]
   7890 
   7891   *) New 'passwd' tool for crypt(3) and apr1 password hashes.
   7892      [Bodo Moeller]
   7893 
   7894   *) Add command line password options to the remaining applications.
   7895      [Steve Henson]
   7896 
   7897   *) Bug fix for BN_div_recp() for numerators with an even number of
   7898      bits.
   7899      [Ulf Mller]
   7900 
   7901   *) More tests in bntest.c, and changed test_bn output.
   7902      [Ulf Mller]
   7903 
   7904   *) ./config recognizes MacOS X now.
   7905      [Andy Polyakov]
   7906 
   7907   *) Bug fix for BN_div() when the first words of num and divsor are
   7908      equal (it gave wrong results if (rem=(n1-q*d0)&BN_MASK2) < d0).
   7909      [Ulf Mller]
   7910 
   7911   *) Add support for various broken PKCS#8 formats, and command line
   7912      options to produce them.
   7913      [Steve Henson]
   7914 
   7915   *) New functions BN_CTX_start(), BN_CTX_get() and BT_CTX_end() to
   7916      get temporary BIGNUMs from a BN_CTX.
   7917      [Ulf Mller]
   7918 
   7919   *) Correct return values in BN_mod_exp_mont() and BN_mod_exp2_mont()
   7920      for p == 0.
   7921      [Ulf Mller]
   7922 
   7923   *) Change the SSLeay_add_all_*() functions to OpenSSL_add_all_*() and
   7924      include a #define from the old name to the new. The original intent
   7925      was that statically linked binaries could for example just call
   7926      SSLeay_add_all_ciphers() to just add ciphers to the table and not
   7927      link with digests. This never worked becayse SSLeay_add_all_digests()
   7928      and SSLeay_add_all_ciphers() were in the same source file so calling
   7929      one would link with the other. They are now in separate source files.
   7930      [Steve Henson]
   7931 
   7932   *) Add a new -notext option to 'ca' and a -pubkey option to 'spkac'.
   7933      [Steve Henson]
   7934 
   7935   *) Use a less unusual form of the Miller-Rabin primality test (it used
   7936      a binary algorithm for exponentiation integrated into the Miller-Rabin
   7937      loop, our standard modexp algorithms are faster).
   7938      [Bodo Moeller]
   7939 
   7940   *) Support for the EBCDIC character set completed.
   7941      [Martin Kraemer <Martin.Kraemer (a] Mch.SNI.De>]
   7942 
   7943   *) Source code cleanups: use const where appropriate, eliminate casts,
   7944      use void * instead of char * in lhash.
   7945      [Ulf Mller] 
   7946 
   7947   *) Bugfix: ssl3_send_server_key_exchange was not restartable
   7948      (the state was not changed to SSL3_ST_SW_KEY_EXCH_B, and because of
   7949      this the server could overwrite ephemeral keys that the client
   7950      has already seen).
   7951      [Bodo Moeller]
   7952 
   7953   *) Turn DSA_is_prime into a macro that calls BN_is_prime,
   7954      using 50 iterations of the Rabin-Miller test.
   7955 
   7956      DSA_generate_parameters now uses BN_is_prime_fasttest (with 50
   7957      iterations of the Rabin-Miller test as required by the appendix
   7958      to FIPS PUB 186[-1]) instead of DSA_is_prime.
   7959      As BN_is_prime_fasttest includes trial division, DSA parameter
   7960      generation becomes much faster.
   7961 
   7962      This implies a change for the callback functions in DSA_is_prime
   7963      and DSA_generate_parameters: The callback function is called once
   7964      for each positive witness in the Rabin-Miller test, not just
   7965      occasionally in the inner loop; and the parameters to the
   7966      callback function now provide an iteration count for the outer
   7967      loop rather than for the current invocation of the inner loop.
   7968      DSA_generate_parameters additionally can call the callback
   7969      function with an 'iteration count' of -1, meaning that a
   7970      candidate has passed the trial division test (when q is generated 
   7971      from an application-provided seed, trial division is skipped).
   7972      [Bodo Moeller]
   7973 
   7974   *) New function BN_is_prime_fasttest that optionally does trial
   7975      division before starting the Rabin-Miller test and has
   7976      an additional BN_CTX * argument (whereas BN_is_prime always
   7977      has to allocate at least one BN_CTX).
   7978      'callback(1, -1, cb_arg)' is called when a number has passed the
   7979      trial division stage.
   7980      [Bodo Moeller]
   7981 
   7982   *) Fix for bug in CRL encoding. The validity dates weren't being handled
   7983      as ASN1_TIME.
   7984      [Steve Henson]
   7985 
   7986   *) New -pkcs12 option to CA.pl script to write out a PKCS#12 file.
   7987      [Steve Henson]
   7988 
   7989   *) New function BN_pseudo_rand().
   7990      [Ulf Mller]
   7991 
   7992   *) Clean up BN_mod_mul_montgomery(): replace the broken (and unreadable)
   7993      bignum version of BN_from_montgomery() with the working code from
   7994      SSLeay 0.9.0 (the word based version is faster anyway), and clean up
   7995      the comments.
   7996      [Ulf Mller]
   7997 
   7998   *) Avoid a race condition in s2_clnt.c (function get_server_hello) that
   7999      made it impossible to use the same SSL_SESSION data structure in
   8000      SSL2 clients in multiple threads.
   8001      [Bodo Moeller]
   8002 
   8003   *) The return value of RAND_load_file() no longer counts bytes obtained
   8004      by stat().  RAND_load_file(..., -1) is new and uses the complete file
   8005      to seed the PRNG (previously an explicit byte count was required).
   8006      [Ulf Mller, Bodo Mller]
   8007 
   8008   *) Clean up CRYPTO_EX_DATA functions, some of these didn't have prototypes
   8009      used (char *) instead of (void *) and had casts all over the place.
   8010      [Steve Henson]
   8011 
   8012   *) Make BN_generate_prime() return NULL on error if ret!=NULL.
   8013      [Ulf Mller]
   8014 
   8015   *) Retain source code compatibility for BN_prime_checks macro:
   8016      BN_is_prime(..., BN_prime_checks, ...) now uses
   8017      BN_prime_checks_for_size to determine the appropriate number of
   8018      Rabin-Miller iterations.
   8019      [Ulf Mller]
   8020 
   8021   *) Diffie-Hellman uses "safe" primes: DH_check() return code renamed to
   8022      DH_CHECK_P_NOT_SAFE_PRIME.
   8023      (Check if this is true? OpenPGP calls them "strong".)
   8024      [Ulf Mller]
   8025 
   8026   *) Merge the functionality of "dh" and "gendh" programs into a new program
   8027      "dhparam". The old programs are retained for now but will handle DH keys
   8028      (instead of parameters) in future.
   8029      [Steve Henson]
   8030 
   8031   *) Make the ciphers, s_server and s_client programs check the return values
   8032      when a new cipher list is set.
   8033      [Steve Henson]
   8034 
   8035   *) Enhance the SSL/TLS cipher mechanism to correctly handle the TLS 56bit
   8036      ciphers. Before when the 56bit ciphers were enabled the sorting was
   8037      wrong.
   8038 
   8039      The syntax for the cipher sorting has been extended to support sorting by
   8040      cipher-strength (using the strength_bits hard coded in the tables).
   8041      The new command is "@STRENGTH" (see also doc/apps/ciphers.pod).
   8042 
   8043      Fix a bug in the cipher-command parser: when supplying a cipher command
   8044      string with an "undefined" symbol (neither command nor alphanumeric
   8045      [A-Za-z0-9], ssl_set_cipher_list used to hang in an endless loop. Now
   8046      an error is flagged.
   8047 
   8048      Due to the strength-sorting extension, the code of the
   8049      ssl_create_cipher_list() function was completely rearranged. I hope that
   8050      the readability was also increased :-)
   8051      [Lutz Jaenicke <Lutz.Jaenicke (a] aet.TU-Cottbus.DE>]
   8052 
   8053   *) Minor change to 'x509' utility. The -CAcreateserial option now uses 1
   8054      for the first serial number and places 2 in the serial number file. This
   8055      avoids problems when the root CA is created with serial number zero and
   8056      the first user certificate has the same issuer name and serial number
   8057      as the root CA.
   8058      [Steve Henson]
   8059 
   8060   *) Fixes to X509_ATTRIBUTE utilities, change the 'req' program so it uses
   8061      the new code. Add documentation for this stuff.
   8062      [Steve Henson]
   8063 
   8064   *) Changes to X509_ATTRIBUTE utilities. These have been renamed from
   8065      X509_*() to X509at_*() on the grounds that they don't handle X509
   8066      structures and behave in an analagous way to the X509v3 functions:
   8067      they shouldn't be called directly but wrapper functions should be used
   8068      instead.
   8069 
   8070      So we also now have some wrapper functions that call the X509at functions
   8071      when passed certificate requests. (TO DO: similar things can be done with
   8072      PKCS#7 signed and unsigned attributes, PKCS#12 attributes and a few other
   8073      things. Some of these need some d2i or i2d and print functionality
   8074      because they handle more complex structures.)
   8075      [Steve Henson]
   8076 
   8077   *) Add missing #ifndefs that caused missing symbols when building libssl
   8078      as a shared library without RSA.  Use #ifndef NO_SSL2 instead of
   8079      NO_RSA in ssl/s2*.c. 
   8080      [Kris Kennaway <kris (a] hub.freebsd.org>, modified by Ulf Mller]
   8081 
   8082   *) Precautions against using the PRNG uninitialized: RAND_bytes() now
   8083      has a return value which indicates the quality of the random data
   8084      (1 = ok, 0 = not seeded).  Also an error is recorded on the thread's
   8085      error queue. New function RAND_pseudo_bytes() generates output that is
   8086      guaranteed to be unique but not unpredictable. RAND_add is like
   8087      RAND_seed, but takes an extra argument for an entropy estimate
   8088      (RAND_seed always assumes full entropy).
   8089      [Ulf Mller]
   8090 
   8091   *) Do more iterations of Rabin-Miller probable prime test (specifically,
   8092      3 for 1024-bit primes, 6 for 512-bit primes, 12 for 256-bit primes
   8093      instead of only 2 for all lengths; see BN_prime_checks_for_size definition
   8094      in crypto/bn/bn_prime.c for the complete table).  This guarantees a
   8095      false-positive rate of at most 2^-80 for random input.
   8096      [Bodo Moeller]
   8097 
   8098   *) Rewrite ssl3_read_n (ssl/s3_pkt.c) avoiding a couple of bugs.
   8099      [Bodo Moeller]
   8100 
   8101   *) New function X509_CTX_rget_chain() (renamed to X509_CTX_get1_chain
   8102      in the 0.9.5 release), this returns the chain
   8103      from an X509_CTX structure with a dup of the stack and all
   8104      the X509 reference counts upped: so the stack will exist
   8105      after X509_CTX_cleanup() has been called. Modify pkcs12.c
   8106      to use this.
   8107 
   8108      Also make SSL_SESSION_print() print out the verify return
   8109      code.
   8110      [Steve Henson]
   8111 
   8112   *) Add manpage for the pkcs12 command. Also change the default
   8113      behaviour so MAC iteration counts are used unless the new
   8114      -nomaciter option is used. This improves file security and
   8115      only older versions of MSIE (4.0 for example) need it.
   8116      [Steve Henson]
   8117 
   8118   *) Honor the no-xxx Configure options when creating .DEF files.
   8119      [Ulf Mller]
   8120 
   8121   *) Add PKCS#10 attributes to field table: challengePassword, 
   8122      unstructuredName and unstructuredAddress. These are taken from
   8123      draft PKCS#9 v2.0 but are compatible with v1.2 provided no 
   8124      international characters are used.
   8125 
   8126      More changes to X509_ATTRIBUTE code: allow the setting of types
   8127      based on strings. Remove the 'loc' parameter when adding
   8128      attributes because these will be a SET OF encoding which is sorted
   8129      in ASN1 order.
   8130      [Steve Henson]
   8131 
   8132   *) Initial changes to the 'req' utility to allow request generation
   8133      automation. This will allow an application to just generate a template
   8134      file containing all the field values and have req construct the
   8135      request.
   8136 
   8137      Initial support for X509_ATTRIBUTE handling. Stacks of these are
   8138      used all over the place including certificate requests and PKCS#7
   8139      structures. They are currently handled manually where necessary with
   8140      some primitive wrappers for PKCS#7. The new functions behave in a
   8141      manner analogous to the X509 extension functions: they allow
   8142      attributes to be looked up by NID and added.
   8143 
   8144      Later something similar to the X509V3 code would be desirable to
   8145      automatically handle the encoding, decoding and printing of the
   8146      more complex types. The string types like challengePassword can
   8147      be handled by the string table functions.
   8148 
   8149      Also modified the multi byte string table handling. Now there is
   8150      a 'global mask' which masks out certain types. The table itself
   8151      can use the flag STABLE_NO_MASK to ignore the mask setting: this
   8152      is useful when for example there is only one permissible type
   8153      (as in countryName) and using the mask might result in no valid
   8154      types at all.
   8155      [Steve Henson]
   8156 
   8157   *) Clean up 'Finished' handling, and add functions SSL_get_finished and
   8158      SSL_get_peer_finished to allow applications to obtain the latest
   8159      Finished messages sent to the peer or expected from the peer,
   8160      respectively.  (SSL_get_peer_finished is usually the Finished message
   8161      actually received from the peer, otherwise the protocol will be aborted.)
   8162 
   8163      As the Finished message are message digests of the complete handshake
   8164      (with a total of 192 bits for TLS 1.0 and more for SSL 3.0), they can
   8165      be used for external authentication procedures when the authentication
   8166      provided by SSL/TLS is not desired or is not enough.
   8167      [Bodo Moeller]
   8168 
   8169   *) Enhanced support for Alpha Linux is added. Now ./config checks if
   8170      the host supports BWX extension and if Compaq C is present on the
   8171      $PATH. Just exploiting of the BWX extension results in 20-30%
   8172      performance kick for some algorithms, e.g. DES and RC4 to mention
   8173      a couple. Compaq C in turn generates ~20% faster code for MD5 and
   8174      SHA1.
   8175      [Andy Polyakov]
   8176 
   8177   *) Add support for MS "fast SGC". This is arguably a violation of the
   8178      SSL3/TLS protocol. Netscape SGC does two handshakes: the first with
   8179      weak crypto and after checking the certificate is SGC a second one
   8180      with strong crypto. MS SGC stops the first handshake after receiving
   8181      the server certificate message and sends a second client hello. Since
   8182      a server will typically do all the time consuming operations before
   8183      expecting any further messages from the client (server key exchange
   8184      is the most expensive) there is little difference between the two.
   8185 
   8186      To get OpenSSL to support MS SGC we have to permit a second client
   8187      hello message after we have sent server done. In addition we have to
   8188      reset the MAC if we do get this second client hello.
   8189      [Steve Henson]
   8190 
   8191   *) Add a function 'd2i_AutoPrivateKey()' this will automatically decide
   8192      if a DER encoded private key is RSA or DSA traditional format. Changed
   8193      d2i_PrivateKey_bio() to use it. This is only needed for the "traditional"
   8194      format DER encoded private key. Newer code should use PKCS#8 format which
   8195      has the key type encoded in the ASN1 structure. Added DER private key
   8196      support to pkcs8 application.
   8197      [Steve Henson]
   8198 
   8199   *) SSL 3/TLS 1 servers now don't request certificates when an anonymous
   8200      ciphersuites has been selected (as required by the SSL 3/TLS 1
   8201      specifications).  Exception: When SSL_VERIFY_FAIL_IF_NO_PEER_CERT
   8202      is set, we interpret this as a request to violate the specification
   8203      (the worst that can happen is a handshake failure, and 'correct'
   8204      behaviour would result in a handshake failure anyway).
   8205      [Bodo Moeller]
   8206 
   8207   *) In SSL_CTX_add_session, take into account that there might be multiple
   8208      SSL_SESSION structures with the same session ID (e.g. when two threads
   8209      concurrently obtain them from an external cache).
   8210      The internal cache can handle only one SSL_SESSION with a given ID,
   8211      so if there's a conflict, we now throw out the old one to achieve
   8212      consistency.
   8213      [Bodo Moeller]
   8214 
   8215   *) Add OIDs for idea and blowfish in CBC mode. This will allow both
   8216      to be used in PKCS#5 v2.0 and S/MIME.  Also add checking to
   8217      some routines that use cipher OIDs: some ciphers do not have OIDs
   8218      defined and so they cannot be used for S/MIME and PKCS#5 v2.0 for
   8219      example.
   8220      [Steve Henson]
   8221 
   8222   *) Simplify the trust setting structure and code. Now we just have
   8223      two sequences of OIDs for trusted and rejected settings. These will
   8224      typically have values the same as the extended key usage extension
   8225      and any application specific purposes.
   8226 
   8227      The trust checking code now has a default behaviour: it will just
   8228      check for an object with the same NID as the passed id. Functions can
   8229      be provided to override either the default behaviour or the behaviour
   8230      for a given id. SSL client, server and email already have functions
   8231      in place for compatibility: they check the NID and also return "trusted"
   8232      if the certificate is self signed.
   8233      [Steve Henson]
   8234 
   8235   *) Add d2i,i2d bio/fp functions for PrivateKey: these convert the
   8236      traditional format into an EVP_PKEY structure.
   8237      [Steve Henson]
   8238 
   8239   *) Add a password callback function PEM_cb() which either prompts for
   8240      a password if usr_data is NULL or otherwise assumes it is a null
   8241      terminated password. Allow passwords to be passed on command line
   8242      environment or config files in a few more utilities.
   8243      [Steve Henson]
   8244 
   8245   *) Add a bunch of DER and PEM functions to handle PKCS#8 format private
   8246      keys. Add some short names for PKCS#8 PBE algorithms and allow them
   8247      to be specified on the command line for the pkcs8 and pkcs12 utilities.
   8248      Update documentation.
   8249      [Steve Henson]
   8250 
   8251   *) Support for ASN1 "NULL" type. This could be handled before by using
   8252      ASN1_TYPE but there wasn't any function that would try to read a NULL
   8253      and produce an error if it couldn't. For compatibility we also have
   8254      ASN1_NULL_new() and ASN1_NULL_free() functions but these are faked and
   8255      don't allocate anything because they don't need to.
   8256      [Steve Henson]
   8257 
   8258   *) Initial support for MacOS is now provided. Examine INSTALL.MacOS
   8259      for details.
   8260      [Andy Polyakov, Roy Woods <roy (a] centicsystems.ca>]
   8261 
   8262   *) Rebuild of the memory allocation routines used by OpenSSL code and
   8263      possibly others as well.  The purpose is to make an interface that
   8264      provide hooks so anyone can build a separate set of allocation and
   8265      deallocation routines to be used by OpenSSL, for example memory
   8266      pool implementations, or something else, which was previously hard
   8267      since Malloc(), Realloc() and Free() were defined as macros having
   8268      the values malloc, realloc and free, respectively (except for Win32
   8269      compilations).  The same is provided for memory debugging code.
   8270      OpenSSL already comes with functionality to find memory leaks, but
   8271      this gives people a chance to debug other memory problems.
   8272 
   8273      With these changes, a new set of functions and macros have appeared:
   8274 
   8275        CRYPTO_set_mem_debug_functions()	        [F]
   8276        CRYPTO_get_mem_debug_functions()         [F]
   8277        CRYPTO_dbg_set_options()	                [F]
   8278        CRYPTO_dbg_get_options()                 [F]
   8279        CRYPTO_malloc_debug_init()               [M]
   8280 
   8281      The memory debug functions are NULL by default, unless the library
   8282      is compiled with CRYPTO_MDEBUG or friends is defined.  If someone
   8283      wants to debug memory anyway, CRYPTO_malloc_debug_init() (which
   8284      gives the standard debugging functions that come with OpenSSL) or
   8285      CRYPTO_set_mem_debug_functions() (tells OpenSSL to use functions
   8286      provided by the library user) must be used.  When the standard
   8287      debugging functions are used, CRYPTO_dbg_set_options can be used to
   8288      request additional information:
   8289      CRYPTO_dbg_set_options(V_CYRPTO_MDEBUG_xxx) corresponds to setting
   8290      the CRYPTO_MDEBUG_xxx macro when compiling the library.   
   8291 
   8292      Also, things like CRYPTO_set_mem_functions will always give the
   8293      expected result (the new set of functions is used for allocation
   8294      and deallocation) at all times, regardless of platform and compiler
   8295      options.
   8296 
   8297      To finish it up, some functions that were never use in any other
   8298      way than through macros have a new API and new semantic:
   8299 
   8300        CRYPTO_dbg_malloc()
   8301        CRYPTO_dbg_realloc()
   8302        CRYPTO_dbg_free()
   8303 
   8304      All macros of value have retained their old syntax.
   8305      [Richard Levitte and Bodo Moeller]
   8306 
   8307   *) Some S/MIME fixes. The OID for SMIMECapabilities was wrong, the
   8308      ordering of SMIMECapabilities wasn't in "strength order" and there
   8309      was a missing NULL in the AlgorithmIdentifier for the SHA1 signature
   8310      algorithm.
   8311      [Steve Henson]
   8312 
   8313   *) Some ASN1 types with illegal zero length encoding (INTEGER,
   8314      ENUMERATED and OBJECT IDENTIFIER) choked the ASN1 routines.
   8315      [Frans Heymans <fheymans (a] isaserver.be>, modified by Steve Henson]
   8316 
   8317   *) Merge in my S/MIME library for OpenSSL. This provides a simple
   8318      S/MIME API on top of the PKCS#7 code, a MIME parser (with enough
   8319      functionality to handle multipart/signed properly) and a utility
   8320      called 'smime' to call all this stuff. This is based on code I
   8321      originally wrote for Celo who have kindly allowed it to be
   8322      included in OpenSSL.
   8323      [Steve Henson]
   8324 
   8325   *) Add variants des_set_key_checked and des_set_key_unchecked of
   8326      des_set_key (aka des_key_sched).  Global variable des_check_key
   8327      decides which of these is called by des_set_key; this way
   8328      des_check_key behaves as it always did, but applications and
   8329      the library itself, which was buggy for des_check_key == 1,
   8330      have a cleaner way to pick the version they need.
   8331      [Bodo Moeller]
   8332 
   8333   *) New function PKCS12_newpass() which changes the password of a
   8334      PKCS12 structure.
   8335      [Steve Henson]
   8336 
   8337   *) Modify X509_TRUST and X509_PURPOSE so it also uses a static and
   8338      dynamic mix. In both cases the ids can be used as an index into the
   8339      table. Also modified the X509_TRUST_add() and X509_PURPOSE_add()
   8340      functions so they accept a list of the field values and the
   8341      application doesn't need to directly manipulate the X509_TRUST
   8342      structure.
   8343      [Steve Henson]
   8344 
   8345   *) Modify the ASN1_STRING_TABLE stuff so it also uses bsearch and doesn't
   8346      need initialising.
   8347      [Steve Henson]
   8348 
   8349   *) Modify the way the V3 extension code looks up extensions. This now
   8350      works in a similar way to the object code: we have some "standard"
   8351      extensions in a static table which is searched with OBJ_bsearch()
   8352      and the application can add dynamic ones if needed. The file
   8353      crypto/x509v3/ext_dat.h now has the info: this file needs to be
   8354      updated whenever a new extension is added to the core code and kept
   8355      in ext_nid order. There is a simple program 'tabtest.c' which checks
   8356      this. New extensions are not added too often so this file can readily
   8357      be maintained manually.
   8358 
   8359      There are two big advantages in doing things this way. The extensions
   8360      can be looked up immediately and no longer need to be "added" using
   8361      X509V3_add_standard_extensions(): this function now does nothing.
   8362      [Side note: I get *lots* of email saying the extension code doesn't
   8363       work because people forget to call this function]
   8364      Also no dynamic allocation is done unless new extensions are added:
   8365      so if we don't add custom extensions there is no need to call
   8366      X509V3_EXT_cleanup().
   8367      [Steve Henson]
   8368 
   8369   *) Modify enc utility's salting as follows: make salting the default. Add a
   8370      magic header, so unsalted files fail gracefully instead of just decrypting
   8371      to garbage. This is because not salting is a big security hole, so people
   8372      should be discouraged from doing it.
   8373      [Ben Laurie]
   8374 
   8375   *) Fixes and enhancements to the 'x509' utility. It allowed a message
   8376      digest to be passed on the command line but it only used this
   8377      parameter when signing a certificate. Modified so all relevant
   8378      operations are affected by the digest parameter including the
   8379      -fingerprint and -x509toreq options. Also -x509toreq choked if a
   8380      DSA key was used because it didn't fix the digest.
   8381      [Steve Henson]
   8382 
   8383   *) Initial certificate chain verify code. Currently tests the untrusted
   8384      certificates for consistency with the verify purpose (which is set
   8385      when the X509_STORE_CTX structure is set up) and checks the pathlength.
   8386 
   8387      There is a NO_CHAIN_VERIFY compilation option to keep the old behaviour:
   8388      this is because it will reject chains with invalid extensions whereas
   8389      every previous version of OpenSSL and SSLeay made no checks at all.
   8390 
   8391      Trust code: checks the root CA for the relevant trust settings. Trust
   8392      settings have an initial value consistent with the verify purpose: e.g.
   8393      if the verify purpose is for SSL client use it expects the CA to be
   8394      trusted for SSL client use. However the default value can be changed to
   8395      permit custom trust settings: one example of this would be to only trust
   8396      certificates from a specific "secure" set of CAs.
   8397 
   8398      Also added X509_STORE_CTX_new() and X509_STORE_CTX_free() functions
   8399      which should be used for version portability: especially since the
   8400      verify structure is likely to change more often now.
   8401 
   8402      SSL integration. Add purpose and trust to SSL_CTX and SSL and functions
   8403      to set them. If not set then assume SSL clients will verify SSL servers
   8404      and vice versa.
   8405 
   8406      Two new options to the verify program: -untrusted allows a set of
   8407      untrusted certificates to be passed in and -purpose which sets the
   8408      intended purpose of the certificate. If a purpose is set then the
   8409      new chain verify code is used to check extension consistency.
   8410      [Steve Henson]
   8411 
   8412   *) Support for the authority information access extension.
   8413      [Steve Henson]
   8414 
   8415   *) Modify RSA and DSA PEM read routines to transparently handle
   8416      PKCS#8 format private keys. New *_PUBKEY_* functions that handle
   8417      public keys in a format compatible with certificate
   8418      SubjectPublicKeyInfo structures. Unfortunately there were already
   8419      functions called *_PublicKey_* which used various odd formats so
   8420      these are retained for compatibility: however the DSA variants were
   8421      never in a public release so they have been deleted. Changed dsa/rsa
   8422      utilities to handle the new format: note no releases ever handled public
   8423      keys so we should be OK.
   8424 
   8425      The primary motivation for this change is to avoid the same fiasco
   8426      that dogs private keys: there are several incompatible private key
   8427      formats some of which are standard and some OpenSSL specific and
   8428      require various evil hacks to allow partial transparent handling and
   8429      even then it doesn't work with DER formats. Given the option anything
   8430      other than PKCS#8 should be dumped: but the other formats have to
   8431      stay in the name of compatibility.
   8432 
   8433      With public keys and the benefit of hindsight one standard format 
   8434      is used which works with EVP_PKEY, RSA or DSA structures: though
   8435      it clearly returns an error if you try to read the wrong kind of key.
   8436 
   8437      Added a -pubkey option to the 'x509' utility to output the public key.
   8438      Also rename the EVP_PKEY_get_*() to EVP_PKEY_rget_*()
   8439      (renamed to EVP_PKEY_get1_*() in the OpenSSL 0.9.5 release) and add
   8440      EVP_PKEY_rset_*() functions (renamed to EVP_PKEY_set1_*())
   8441      that do the same as the EVP_PKEY_assign_*() except they up the
   8442      reference count of the added key (they don't "swallow" the
   8443      supplied key).
   8444      [Steve Henson]
   8445 
   8446   *) Fixes to crypto/x509/by_file.c the code to read in certificates and
   8447      CRLs would fail if the file contained no certificates or no CRLs:
   8448      added a new function to read in both types and return the number
   8449      read: this means that if none are read it will be an error. The
   8450      DER versions of the certificate and CRL reader would always fail
   8451      because it isn't possible to mix certificates and CRLs in DER format
   8452      without choking one or the other routine. Changed this to just read
   8453      a certificate: this is the best we can do. Also modified the code
   8454      in apps/verify.c to take notice of return codes: it was previously
   8455      attempting to read in certificates from NULL pointers and ignoring
   8456      any errors: this is one reason why the cert and CRL reader seemed
   8457      to work. It doesn't check return codes from the default certificate
   8458      routines: these may well fail if the certificates aren't installed.
   8459      [Steve Henson]
   8460 
   8461   *) Code to support otherName option in GeneralName.
   8462      [Steve Henson]
   8463 
   8464   *) First update to verify code. Change the verify utility
   8465      so it warns if it is passed a self signed certificate:
   8466      for consistency with the normal behaviour. X509_verify
   8467      has been modified to it will now verify a self signed
   8468      certificate if *exactly* the same certificate appears
   8469      in the store: it was previously impossible to trust a
   8470      single self signed certificate. This means that:
   8471      openssl verify ss.pem
   8472      now gives a warning about a self signed certificate but
   8473      openssl verify -CAfile ss.pem ss.pem
   8474      is OK.
   8475      [Steve Henson]
   8476 
   8477   *) For servers, store verify_result in SSL_SESSION data structure
   8478      (and add it to external session representation).
   8479      This is needed when client certificate verifications fails,
   8480      but an application-provided verification callback (set by
   8481      SSL_CTX_set_cert_verify_callback) allows accepting the session
   8482      anyway (i.e. leaves x509_store_ctx->error != X509_V_OK
   8483      but returns 1): When the session is reused, we have to set
   8484      ssl->verify_result to the appropriate error code to avoid
   8485      security holes.
   8486      [Bodo Moeller, problem pointed out by Lutz Jaenicke]
   8487 
   8488   *) Fix a bug in the new PKCS#7 code: it didn't consider the
   8489      case in PKCS7_dataInit() where the signed PKCS7 structure
   8490      didn't contain any existing data because it was being created.
   8491      [Po-Cheng Chen <pocheng (a] nst.com.tw>, slightly modified by Steve Henson]
   8492 
   8493   *) Add a salt to the key derivation routines in enc.c. This
   8494      forms the first 8 bytes of the encrypted file. Also add a
   8495      -S option to allow a salt to be input on the command line.
   8496      [Steve Henson]
   8497 
   8498   *) New function X509_cmp(). Oddly enough there wasn't a function
   8499      to compare two certificates. We do this by working out the SHA1
   8500      hash and comparing that. X509_cmp() will be needed by the trust
   8501      code.
   8502      [Steve Henson]
   8503 
   8504   *) SSL_get1_session() is like SSL_get_session(), but increments
   8505      the reference count in the SSL_SESSION returned.
   8506      [Geoff Thorpe <geoff (a] eu.c2.net>]
   8507 
   8508   *) Fix for 'req': it was adding a null to request attributes.
   8509      Also change the X509_LOOKUP and X509_INFO code to handle
   8510      certificate auxiliary information.
   8511      [Steve Henson]
   8512 
   8513   *) Add support for 40 and 64 bit RC2 and RC4 algorithms: document
   8514      the 'enc' command.
   8515      [Steve Henson]
   8516 
   8517   *) Add the possibility to add extra information to the memory leak
   8518      detecting output, to form tracebacks, showing from where each
   8519      allocation was originated: CRYPTO_push_info("constant string") adds
   8520      the string plus current file name and line number to a per-thread
   8521      stack, CRYPTO_pop_info() does the obvious, CRYPTO_remove_all_info()
   8522      is like calling CYRPTO_pop_info() until the stack is empty.
   8523      Also updated memory leak detection code to be multi-thread-safe.
   8524      [Richard Levitte]
   8525 
   8526   *) Add options -text and -noout to pkcs7 utility and delete the
   8527      encryption options which never did anything. Update docs.
   8528      [Steve Henson]
   8529 
   8530   *) Add options to some of the utilities to allow the pass phrase
   8531      to be included on either the command line (not recommended on
   8532      OSes like Unix) or read from the environment. Update the
   8533      manpages and fix a few bugs.
   8534      [Steve Henson]
   8535 
   8536   *) Add a few manpages for some of the openssl commands.
   8537      [Steve Henson]
   8538 
   8539   *) Fix the -revoke option in ca. It was freeing up memory twice,
   8540      leaking and not finding already revoked certificates.
   8541      [Steve Henson]
   8542 
   8543   *) Extensive changes to support certificate auxiliary information.
   8544      This involves the use of X509_CERT_AUX structure and X509_AUX
   8545      functions. An X509_AUX function such as PEM_read_X509_AUX()
   8546      can still read in a certificate file in the usual way but it
   8547      will also read in any additional "auxiliary information". By
   8548      doing things this way a fair degree of compatibility can be
   8549      retained: existing certificates can have this information added
   8550      using the new 'x509' options. 
   8551 
   8552      Current auxiliary information includes an "alias" and some trust
   8553      settings. The trust settings will ultimately be used in enhanced
   8554      certificate chain verification routines: currently a certificate
   8555      can only be trusted if it is self signed and then it is trusted
   8556      for all purposes.
   8557      [Steve Henson]
   8558 
   8559   *) Fix assembler for Alpha (tested only on DEC OSF not Linux or *BSD).
   8560      The problem was that one of the replacement routines had not been working
   8561      since SSLeay releases.  For now the offending routine has been replaced
   8562      with non-optimised assembler.  Even so, this now gives around 95%
   8563      performance improvement for 1024 bit RSA signs.
   8564      [Mark Cox]
   8565 
   8566   *) Hack to fix PKCS#7 decryption when used with some unorthodox RC2 
   8567      handling. Most clients have the effective key size in bits equal to
   8568      the key length in bits: so a 40 bit RC2 key uses a 40 bit (5 byte) key.
   8569      A few however don't do this and instead use the size of the decrypted key
   8570      to determine the RC2 key length and the AlgorithmIdentifier to determine
   8571      the effective key length. In this case the effective key length can still
   8572      be 40 bits but the key length can be 168 bits for example. This is fixed
   8573      by manually forcing an RC2 key into the EVP_PKEY structure because the
   8574      EVP code can't currently handle unusual RC2 key sizes: it always assumes
   8575      the key length and effective key length are equal.
   8576      [Steve Henson]
   8577 
   8578   *) Add a bunch of functions that should simplify the creation of 
   8579      X509_NAME structures. Now you should be able to do:
   8580      X509_NAME_add_entry_by_txt(nm, "CN", MBSTRING_ASC, "Steve", -1, -1, 0);
   8581      and have it automatically work out the correct field type and fill in
   8582      the structures. The more adventurous can try:
   8583      X509_NAME_add_entry_by_txt(nm, field, MBSTRING_UTF8, str, -1, -1, 0);
   8584      and it will (hopefully) work out the correct multibyte encoding.
   8585      [Steve Henson]
   8586 
   8587   *) Change the 'req' utility to use the new field handling and multibyte
   8588      copy routines. Before the DN field creation was handled in an ad hoc
   8589      way in req, ca, and x509 which was rather broken and didn't support
   8590      BMPStrings or UTF8Strings. Since some software doesn't implement
   8591      BMPStrings or UTF8Strings yet, they can be enabled using the config file
   8592      using the dirstring_type option. See the new comment in the default
   8593      openssl.cnf for more info.
   8594      [Steve Henson]
   8595 
   8596   *) Make crypto/rand/md_rand.c more robust:
   8597      - Assure unique random numbers after fork().
   8598      - Make sure that concurrent threads access the global counter and
   8599        md serializably so that we never lose entropy in them
   8600        or use exactly the same state in multiple threads.
   8601        Access to the large state is not always serializable because
   8602        the additional locking could be a performance killer, and
   8603        md should be large enough anyway.
   8604      [Bodo Moeller]
   8605 
   8606   *) New file apps/app_rand.c with commonly needed functionality
   8607      for handling the random seed file.
   8608 
   8609      Use the random seed file in some applications that previously did not:
   8610           ca,
   8611           dsaparam -genkey (which also ignored its '-rand' option), 
   8612           s_client,
   8613           s_server,
   8614           x509 (when signing).
   8615      Except on systems with /dev/urandom, it is crucial to have a random
   8616      seed file at least for key creation, DSA signing, and for DH exchanges;
   8617      for RSA signatures we could do without one.
   8618 
   8619      gendh and gendsa (unlike genrsa) used to read only the first byte
   8620      of each file listed in the '-rand' option.  The function as previously
   8621      found in genrsa is now in app_rand.c and is used by all programs
   8622      that support '-rand'.
   8623      [Bodo Moeller]
   8624 
   8625   *) In RAND_write_file, use mode 0600 for creating files;
   8626      don't just chmod when it may be too late.
   8627      [Bodo Moeller]
   8628 
   8629   *) Report an error from X509_STORE_load_locations
   8630      when X509_LOOKUP_load_file or X509_LOOKUP_add_dir failed.
   8631      [Bill Perry]
   8632 
   8633   *) New function ASN1_mbstring_copy() this copies a string in either
   8634      ASCII, Unicode, Universal (4 bytes per character) or UTF8 format
   8635      into an ASN1_STRING type. A mask of permissible types is passed
   8636      and it chooses the "minimal" type to use or an error if not type
   8637      is suitable.
   8638      [Steve Henson]
   8639 
   8640   *) Add function equivalents to the various macros in asn1.h. The old
   8641      macros are retained with an M_ prefix. Code inside the library can
   8642      use the M_ macros. External code (including the openssl utility)
   8643      should *NOT* in order to be "shared library friendly".
   8644      [Steve Henson]
   8645 
   8646   *) Add various functions that can check a certificate's extensions
   8647      to see if it usable for various purposes such as SSL client,
   8648      server or S/MIME and CAs of these types. This is currently 
   8649      VERY EXPERIMENTAL but will ultimately be used for certificate chain
   8650      verification. Also added a -purpose flag to x509 utility to
   8651      print out all the purposes.
   8652      [Steve Henson]
   8653 
   8654   *) Add a CRYPTO_EX_DATA to X509 certificate structure and associated
   8655      functions.
   8656      [Steve Henson]
   8657 
   8658   *) New X509V3_{X509,CRL,REVOKED}_get_d2i() functions. These will search
   8659      for, obtain and decode and extension and obtain its critical flag.
   8660      This allows all the necessary extension code to be handled in a
   8661      single function call.
   8662      [Steve Henson]
   8663 
   8664   *) RC4 tune-up featuring 30-40% performance improvement on most RISC
   8665      platforms. See crypto/rc4/rc4_enc.c for further details.
   8666      [Andy Polyakov]
   8667 
   8668   *) New -noout option to asn1parse. This causes no output to be produced
   8669      its main use is when combined with -strparse and -out to extract data
   8670      from a file (which may not be in ASN.1 format).
   8671      [Steve Henson]
   8672 
   8673   *) Fix for pkcs12 program. It was hashing an invalid certificate pointer
   8674      when producing the local key id.
   8675      [Richard Levitte <levitte (a] stacken.kth.se>]
   8676 
   8677   *) New option -dhparam in s_server. This allows a DH parameter file to be
   8678      stated explicitly. If it is not stated then it tries the first server
   8679      certificate file. The previous behaviour hard coded the filename
   8680      "server.pem".
   8681      [Steve Henson]
   8682 
   8683   *) Add -pubin and -pubout options to the rsa and dsa commands. These allow
   8684      a public key to be input or output. For example:
   8685      openssl rsa -in key.pem -pubout -out pubkey.pem
   8686      Also added necessary DSA public key functions to handle this.
   8687      [Steve Henson]
   8688 
   8689   *) Fix so PKCS7_dataVerify() doesn't crash if no certificates are contained
   8690      in the message. This was handled by allowing
   8691      X509_find_by_issuer_and_serial() to tolerate a NULL passed to it.
   8692      [Steve Henson, reported by Sampo Kellomaki <sampo (a] mail.neuronio.pt>]
   8693 
   8694   *) Fix for bug in d2i_ASN1_bytes(): other ASN1 functions add an extra null
   8695      to the end of the strings whereas this didn't. This would cause problems
   8696      if strings read with d2i_ASN1_bytes() were later modified.
   8697      [Steve Henson, reported by Arne Ansper <arne (a] ats.cyber.ee>]
   8698 
   8699   *) Fix for base64 decode bug. When a base64 bio reads only one line of
   8700      data and it contains EOF it will end up returning an error. This is
   8701      caused by input 46 bytes long. The cause is due to the way base64
   8702      BIOs find the start of base64 encoded data. They do this by trying a
   8703      trial decode on each line until they find one that works. When they
   8704      do a flag is set and it starts again knowing it can pass all the
   8705      data directly through the decoder. Unfortunately it doesn't reset
   8706      the context it uses. This means that if EOF is reached an attempt
   8707      is made to pass two EOFs through the context and this causes the
   8708      resulting error. This can also cause other problems as well. As is
   8709      usual with these problems it takes *ages* to find and the fix is
   8710      trivial: move one line.
   8711      [Steve Henson, reported by ian (a] uns.ns.ac.yu (Ivan Nejgebauer) ]
   8712 
   8713   *) Ugly workaround to get s_client and s_server working under Windows. The
   8714      old code wouldn't work because it needed to select() on sockets and the
   8715      tty (for keypresses and to see if data could be written). Win32 only
   8716      supports select() on sockets so we select() with a 1s timeout on the
   8717      sockets and then see if any characters are waiting to be read, if none
   8718      are present then we retry, we also assume we can always write data to
   8719      the tty. This isn't nice because the code then blocks until we've
   8720      received a complete line of data and it is effectively polling the
   8721      keyboard at 1s intervals: however it's quite a bit better than not
   8722      working at all :-) A dedicated Windows application might handle this
   8723      with an event loop for example.
   8724      [Steve Henson]
   8725 
   8726   *) Enhance RSA_METHOD structure. Now there are two extra methods, rsa_sign
   8727      and rsa_verify. When the RSA_FLAGS_SIGN_VER option is set these functions
   8728      will be called when RSA_sign() and RSA_verify() are used. This is useful
   8729      if rsa_pub_dec() and rsa_priv_enc() equivalents are not available.
   8730      For this to work properly RSA_public_decrypt() and RSA_private_encrypt()
   8731      should *not* be used: RSA_sign() and RSA_verify() must be used instead.
   8732      This necessitated the support of an extra signature type NID_md5_sha1
   8733      for SSL signatures and modifications to the SSL library to use it instead
   8734      of calling RSA_public_decrypt() and RSA_private_encrypt().
   8735      [Steve Henson]
   8736 
   8737   *) Add new -verify -CAfile and -CApath options to the crl program, these
   8738      will lookup a CRL issuers certificate and verify the signature in a
   8739      similar way to the verify program. Tidy up the crl program so it
   8740      no longer accesses structures directly. Make the ASN1 CRL parsing a bit
   8741      less strict. It will now permit CRL extensions even if it is not
   8742      a V2 CRL: this will allow it to tolerate some broken CRLs.
   8743      [Steve Henson]
   8744 
   8745   *) Initialize all non-automatic variables each time one of the openssl
   8746      sub-programs is started (this is necessary as they may be started
   8747      multiple times from the "OpenSSL>" prompt).
   8748      [Lennart Bang, Bodo Moeller]
   8749 
   8750   *) Preliminary compilation option RSA_NULL which disables RSA crypto without
   8751      removing all other RSA functionality (this is what NO_RSA does). This
   8752      is so (for example) those in the US can disable those operations covered
   8753      by the RSA patent while allowing storage and parsing of RSA keys and RSA
   8754      key generation.
   8755      [Steve Henson]
   8756 
   8757   *) Non-copying interface to BIO pairs.
   8758      (still largely untested)
   8759      [Bodo Moeller]
   8760 
   8761   *) New function ANS1_tag2str() to convert an ASN1 tag to a descriptive
   8762      ASCII string. This was handled independently in various places before.
   8763      [Steve Henson]
   8764 
   8765   *) New functions UTF8_getc() and UTF8_putc() that parse and generate
   8766      UTF8 strings a character at a time.
   8767      [Steve Henson]
   8768 
   8769   *) Use client_version from client hello to select the protocol
   8770      (s23_srvr.c) and for RSA client key exchange verification
   8771      (s3_srvr.c), as required by the SSL 3.0/TLS 1.0 specifications.
   8772      [Bodo Moeller]
   8773 
   8774   *) Add various utility functions to handle SPKACs, these were previously
   8775      handled by poking round in the structure internals. Added new function
   8776      NETSCAPE_SPKI_print() to print out SPKAC and a new utility 'spkac' to
   8777      print, verify and generate SPKACs. Based on an original idea from
   8778      Massimiliano Pala <madwolf (a] comune.modena.it> but extensively modified.
   8779      [Steve Henson]
   8780 
   8781   *) RIPEMD160 is operational on all platforms and is back in 'make test'.
   8782      [Andy Polyakov]
   8783 
   8784   *) Allow the config file extension section to be overwritten on the
   8785      command line. Based on an original idea from Massimiliano Pala
   8786      <madwolf (a] comune.modena.it>. The new option is called -extensions
   8787      and can be applied to ca, req and x509. Also -reqexts to override
   8788      the request extensions in req and -crlexts to override the crl extensions
   8789      in ca.
   8790      [Steve Henson]
   8791 
   8792   *) Add new feature to the SPKAC handling in ca.  Now you can include
   8793      the same field multiple times by preceding it by "XXXX." for example:
   8794      1.OU="Unit name 1"
   8795      2.OU="Unit name 2"
   8796      this is the same syntax as used in the req config file.
   8797      [Steve Henson]
   8798 
   8799   *) Allow certificate extensions to be added to certificate requests. These
   8800      are specified in a 'req_extensions' option of the req section of the
   8801      config file. They can be printed out with the -text option to req but
   8802      are otherwise ignored at present.
   8803      [Steve Henson]
   8804 
   8805   *) Fix a horrible bug in enc_read() in crypto/evp/bio_enc.c: if the first
   8806      data read consists of only the final block it would not decrypted because
   8807      EVP_CipherUpdate() would correctly report zero bytes had been decrypted.
   8808      A misplaced 'break' also meant the decrypted final block might not be
   8809      copied until the next read.
   8810      [Steve Henson]
   8811 
   8812   *) Initial support for DH_METHOD. Again based on RSA_METHOD. Also added
   8813      a few extra parameters to the DH structure: these will be useful if
   8814      for example we want the value of 'q' or implement X9.42 DH.
   8815      [Steve Henson]
   8816 
   8817   *) Initial support for DSA_METHOD. This is based on the RSA_METHOD and
   8818      provides hooks that allow the default DSA functions or functions on a
   8819      "per key" basis to be replaced. This allows hardware acceleration and
   8820      hardware key storage to be handled without major modification to the
   8821      library. Also added low level modexp hooks and CRYPTO_EX structure and 
   8822      associated functions.
   8823      [Steve Henson]
   8824 
   8825   *) Add a new flag to memory BIOs, BIO_FLAG_MEM_RDONLY. This marks the BIO
   8826      as "read only": it can't be written to and the buffer it points to will
   8827      not be freed. Reading from a read only BIO is much more efficient than
   8828      a normal memory BIO. This was added because there are several times when
   8829      an area of memory needs to be read from a BIO. The previous method was
   8830      to create a memory BIO and write the data to it, this results in two
   8831      copies of the data and an O(n^2) reading algorithm. There is a new
   8832      function BIO_new_mem_buf() which creates a read only memory BIO from
   8833      an area of memory. Also modified the PKCS#7 routines to use read only
   8834      memory BIOs.
   8835      [Steve Henson]
   8836 
   8837   *) Bugfix: ssl23_get_client_hello did not work properly when called in
   8838      state SSL23_ST_SR_CLNT_HELLO_B, i.e. when the first 7 bytes of
   8839      a SSLv2-compatible client hello for SSLv3 or TLSv1 could be read,
   8840      but a retry condition occured while trying to read the rest.
   8841      [Bodo Moeller]
   8842 
   8843   *) The PKCS7_ENC_CONTENT_new() function was setting the content type as
   8844      NID_pkcs7_encrypted by default: this was wrong since this should almost
   8845      always be NID_pkcs7_data. Also modified the PKCS7_set_type() to handle
   8846      the encrypted data type: this is a more sensible place to put it and it