$NetBSD: RSA_check_key.3,v 1.1.1.2 2023/04/18 14:19:14 christos Exp $
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Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
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Title "RSA_check_key 3"
way too many mistakes in technical documents.
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========================================================================
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.... Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. \*(C+ will
give a nicer C++. Capital omega is used to do unbreakable dashes and
therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
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If the F register is >0, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
entries marked with X<> in POD. Of course, you'll have to process the
output yourself in some meaningful fashion.
Avoid warning from groff about undefined register 'F'.
.. .nr rF 0 . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================
Title "RSA_check_key 3"
RSA_check_key 3 "2018-09-23" "1.1.1i" "OpenSSL"
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"NAME"
RSA_check_key_ex, RSA_check_key - validate private RSA keys
"LIBRARY"
libcrypto, -lcrypto
"SYNOPSIS"
Header "SYNOPSIS" .Vb 1
#include <openssl/rsa.h>
\&
int RSA_check_key_ex(RSA *rsa, BN_GENCB *cb);
\&
int RSA_check_key(RSA *rsa);
.Ve
"DESCRIPTION"
Header "DESCRIPTION" \fBRSA_check_key_ex() function validates \s-1RSA\s0 keys.
It checks that p and q are
in fact prime, and that n = p*q.
It does not work on \s-1RSA\s0 public keys that have only the modulus and public exponent elements populated. It also checks that d*e = 1 mod (p-1*q-1), and that dmp1, dmq1 and iqmp are set correctly or are \s-1NULL\s0. It performs integrity checks on all the \s-1RSA\s0 key material, so the \s-1RSA\s0 key structure must contain all the private key data too. Therefore, it cannot be used with any arbitrary \s-1RSA\s0 key object, even if it is otherwise fit for regular \s-1RSA\s0 operation.
The cb parameter is a callback that will be invoked in the same manner as BN_is_prime_ex\|(3).
\fBRSA_check_key() is equivalent to RSA_check_key_ex() with a \s-1NULL\s0 cb.
"RETURN VALUES"
Header "RETURN VALUES" \fBRSA_check_key_ex() and RSA_check_key()
return 1 if rsa is a valid \s-1RSA\s0 key, and 0 otherwise.
They return -1 if an error occurs while checking the key.
If the key is invalid or an error occurred, the reason code can be obtained using ERR_get_error\|(3).
"NOTES"
Header "NOTES" Unlike most other \s-1RSA\s0 functions, this function does not work
transparently with any underlying \s-1ENGINE\s0 implementation because it uses the
key data in the \s-1RSA\s0 structure directly. An \s-1ENGINE\s0 implementation can
override the way key data is stored and handled, and can even provide
support for \s-1HSM\s0 keys - in which case the \s-1RSA\s0 structure may contain no
key data at all! If the \s-1ENGINE\s0 in question is only being used for
acceleration or analysis purposes, then in all likelihood the \s-1RSA\s0 key data
is complete and untouched, but this can't be assumed in the general case.
"BUGS"
Header "BUGS" A method of verifying the \s-1RSA\s0 key using opaque \s-1RSA API\s0 functions might need
to be considered. Right now RSA_check_key() simply uses the \s-1RSA\s0 structure
elements directly, bypassing the \s-1RSA_METHOD\s0 table altogether (and
completely violating encapsulation and object-orientation in the process).
The best fix will probably be to introduce a \*(L"check_key()\*(R" handler to the
\s-1RSA_METHOD\s0 function table so that alternative implementations can also
provide their own verifiers.
"SEE ALSO"
Header "SEE ALSO" \fBBN_is_prime_ex\|(3),
\fBERR_get_error\|(3)
"HISTORY"
Header "HISTORY" \fBRSA_check_key_ex() appeared after OpenSSL 1.0.2.
"COPYRIGHT"
Header "COPYRIGHT" Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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