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.TH RSA_sign 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
.UC
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.rm #[ #] #H #V #F C
.SH "NAME"
RSA_sign, RSA_verify \- RSA signatures
.SH "SYNOPSIS"
.PP
.Vb 1
\& #include <openssl/rsa.h>
.Ve
.Vb 2
\& int RSA_sign(int type, unsigned char *m, unsigned int m_len,
\&    unsigned char *sigret, unsigned int *siglen, RSA *rsa);
.Ve
.Vb 2
\& int RSA_verify(int type, unsigned char *m, unsigned int m_len,
\&    unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
.Ve
.SH "DESCRIPTION"
\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
private key \fBrsa\fR as specified in PKCS #1 v2.0. It stores the
signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
must point to \fIRSA_size\fR\|(\fBrsa\fR) bytes of memory.
.PP
\fBtype\fR denotes the message digest algorithm that was used to generate
\fBm\fR. It usually is one of \fBNID_sha1\fR, \fBNID_ripemd160\fR and \fBNID_md5\fR;
see objects(3) for details. If \fBtype\fR is \fBNID_md5_sha1\fR,
an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
and no algorithm identifier) is created.
.PP
\fIRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes
the message digest algorithm that was used to generate the signature.
\fBrsa\fR is the signer's public key.
.SH "RETURN VALUES"
\fIRSA_sign()\fR returns 1 on success, 0 otherwise.  \fIRSA_verify()\fR returns 1
on successful verification, 0 otherwise.
.PP
The error codes can be obtained by ERR_get_error(3).
.SH "BUGS"
Certain signatures with an improper algorithm identifier are accepted
for compatibility with SSLeay 0.4.5 :\-)
.SH "CONFORMING TO"
SSL, PKCS #1 v2.0
.SH "SEE ALSO"
ERR_get_error(3), objects(3),
rsa(3), RSA_private_encrypt(3),
RSA_public_decrypt(3) 
.SH "HISTORY"
\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay
and OpenSSL.

.rn }` ''
.IX Title "RSA_sign 3"
.IX Name "RSA_sign, RSA_verify - RSA signatures"

.IX Header "NAME"

.IX Header "SYNOPSIS"

.IX Header "DESCRIPTION"

.IX Header "RETURN VALUES"

.IX Header "BUGS"

.IX Header "CONFORMING TO"

.IX Header "SEE ALSO"

.IX Header "HISTORY"