192 lines
6.2 KiB
Groff
192 lines
6.2 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "RSA_check_key 3"
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.TH RSA_check_key 3 "2005-02-24" "0.9.7d" "OpenSSL"
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.SH "NAME"
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RSA_check_key \- validate private RSA keys
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/rsa.h>
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.Ve
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.PP
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.Vb 1
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\& int RSA_check_key(RSA *rsa);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This function validates \s-1RSA\s0 keys. It checks that \fBp\fR and \fBq\fR are
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in fact prime, and that \fBn = p*q\fR.
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.PP
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It also checks that \fBd*e = 1 mod (p\-1*q\-1)\fR,
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and that \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR are set correctly or are \fB\s-1NULL\s0\fR.
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.PP
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As such, this function can not be used with any arbitrary \s-1RSA\s0 key object,
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even if it is otherwise fit for regular \s-1RSA\s0 operation. See \fB\s-1NOTES\s0\fR for more
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information.
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.SH "RETURN VALUE"
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.IX Header "RETURN VALUE"
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\&\fIRSA_check_key()\fR returns 1 if \fBrsa\fR is a valid \s-1RSA\s0 key, and 0 otherwise.
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\&\-1 is returned if an error occurs while checking the key.
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.PP
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If the key is invalid or an error occurred, the reason code can be
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obtained using \fIERR_get_error\fR\|(3).
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.SH "NOTES"
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.IX Header "NOTES"
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This function does not work on \s-1RSA\s0 public keys that have only the modulus
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and public exponent elements populated. It performs integrity checks on all
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the \s-1RSA\s0 key material, so the \s-1RSA\s0 key structure must contain all the private
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key data too.
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.PP
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Unlike most other \s-1RSA\s0 functions, this function does \fBnot\fR work
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transparently with any underlying \s-1ENGINE\s0 implementation because it uses the
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key data in the \s-1RSA\s0 structure directly. An \s-1ENGINE\s0 implementation can
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override the way key data is stored and handled, and can even provide
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support for \s-1HSM\s0 keys \- in which case the \s-1RSA\s0 structure may contain \fBno\fR
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key data at all! If the \s-1ENGINE\s0 in question is only being used for
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acceleration or analysis purposes, then in all likelihood the \s-1RSA\s0 key data
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is complete and untouched, but this can't be assumed in the general case.
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.SH "BUGS"
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.IX Header "BUGS"
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A method of verifying the \s-1RSA\s0 key using opaque \s-1RSA\s0 \s-1API\s0 functions might need
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to be considered. Right now \fIRSA_check_key()\fR simply uses the \s-1RSA\s0 structure
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elements directly, bypassing the \s-1RSA_METHOD\s0 table altogether (and
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completely violating encapsulation and object-orientation in the process).
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The best fix will probably be to introduce a \*(L"\fIcheck_key()\fR\*(R" handler to the
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\&\s-1RSA_METHOD\s0 function table so that alternative implementations can also
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provide their own verifiers.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIrsa\fR\|(3), \fIERR_get_error\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIRSA_check_key()\fR appeared in OpenSSL 0.9.4.
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