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Editing: RSA_check_key.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RSA_check_key \- validate private RSA keys .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/rsa.h> \& \& int RSA_check_key(RSA *rsa); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" This function validates \s-1RSA\s0 keys. It checks that \fBp\fR and \fBq\fR are in fact prime, and that \fBn = p*q\fR. .PP It also checks that \fBd*e = 1 mod (p\-1*q\-1)\fR, and that \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR are set correctly or are \fB\s-1NULL\s0\fR. .PP As such, this function can not be used with any arbitrary \s-1RSA\s0 key object, even if it is otherwise fit for regular \s-1RSA\s0 operation. See \fB\s-1NOTES\s0\fR for more information. .SH "RETURN VALUE" .IX Header "RETURN VALUE" \&\fBRSA_check_key()\fR returns 1 if \fBrsa\fR is a valid \s-1RSA\s0 key, and 0 otherwise. \&\-1 is returned if an error occurs while checking the key. .PP If the key is invalid or an error occurred, the reason code can be obtained using \fBERR_get_error\fR\|(3). .SH "NOTES" .IX Header "NOTES" This function does not work on \s-1RSA\s0 public keys that have only the modulus and public exponent elements populated. 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. .PP Unlike most other \s-1RSA\s0 functions, this function does \fBnot\fR 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 \fBno\fR 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. .SH "BUGS" .IX 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 \fBRSA_check_key()\fR 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"\fBcheck_key()\fR\*(R" handler to the \&\s-1RSA_METHOD\s0 function table so that alternative implementations can also provide their own verifiers. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBrsa\fR\|(3), \fBERR_get_error\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBRSA_check_key()\fR appeared in OpenSSL 0.9.4.
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