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      1 =pod
      2 
      3 =head1 NAME
      4 
      5 MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
      6 MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash functions
      7 
      8 =head1 SYNOPSIS
      9 
     10  #include <openssl/md2.h>
     11 
     12  unsigned char *MD2(const unsigned char *d, unsigned long n, unsigned char *md);
     13 
     14  int MD2_Init(MD2_CTX *c);
     15  int MD2_Update(MD2_CTX *c, const unsigned char *data, unsigned long len);
     16  int MD2_Final(unsigned char *md, MD2_CTX *c);
     17 
     18 
     19  #include <openssl/md4.h>
     20 
     21  unsigned char *MD4(const unsigned char *d, unsigned long n, unsigned char *md);
     22 
     23  int MD4_Init(MD4_CTX *c);
     24  int MD4_Update(MD4_CTX *c, const void *data, unsigned long len);
     25  int MD4_Final(unsigned char *md, MD4_CTX *c);
     26 
     27 
     28  #include <openssl/md5.h>
     29 
     30  unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned char *md);
     31 
     32  int MD5_Init(MD5_CTX *c);
     33  int MD5_Update(MD5_CTX *c, const void *data, unsigned long len);
     34  int MD5_Final(unsigned char *md, MD5_CTX *c);
     35 
     36 =head1 DESCRIPTION
     37 
     38 MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output.
     39 
     40 MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest
     41 of the B<n> bytes at B<d> and place it in B<md> (which must have space
     42 for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16
     43 bytes of output). If B<md> is NULL, the digest is placed in a static
     44 array.
     45 
     46 The following functions may be used if the message is not completely
     47 stored in memory:
     48 
     49 MD2_Init() initializes a B<MD2_CTX> structure.
     50 
     51 MD2_Update() can be called repeatedly with chunks of the message to
     52 be hashed (B<len> bytes at B<data>).
     53 
     54 MD2_Final() places the message digest in B<md>, which must have space
     55 for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MD2_CTX>.
     56 
     57 MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and
     58 MD5_Final() are analogous using an B<MD4_CTX> and B<MD5_CTX> structure.
     59 
     60 Applications should use the higher level functions
     61 L<EVP_DigestInit(3)>
     62 etc. instead of calling the hash functions directly.
     63 
     64 =head1 NOTE
     65 
     66 MD2, MD4, and MD5 are recommended only for compatibility with existing
     67 applications. In new applications, SHA-1 or RIPEMD-160 should be
     68 preferred.
     69 
     70 =head1 RETURN VALUES
     71 
     72 MD2(), MD4(), and MD5() return pointers to the hash value.
     73 
     74 MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(),
     75 MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for
     76 success, 0 otherwise.
     77 
     78 =head1 CONFORMING TO
     79 
     80 RFC 1319, RFC 1320, RFC 1321
     81 
     82 =head1 SEE ALSO
     83 
     84 L<EVP_DigestInit(3)>
     85 
     86 =head1 COPYRIGHT
     87 
     88 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
     89 
     90 Licensed under the OpenSSL license (the "License").  You may not use
     91 this file except in compliance with the License.  You can obtain a copy
     92 in the file LICENSE in the source distribution or at
     93 L<https://www.openssl.org/source/license.html>.
     94 
     95 =cut
     96