NetBSD/lib/libcrypto/man/RSA_sign.3

.\"	$NetBSD: RSA_sign.3,v 1.6 2002/02/07 07:00:40 ross Exp $
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.IX Title "RSA_sign 3"
.TH RSA_sign 3 "0.9.6a" "2000-07-22" "OpenSSL"
.UC
.SH "NAME"
RSA_sign, RSA_verify \- \s-1RSA\s0 signatures
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include \*[Lt]openssl/rsa.h\*[Gt]
.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"
.IX Header "DESCRIPTION"
\&\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
private key \fBrsa\fR as specified in \s-1PKCS\s0 #1 v2.0. It stores the
signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
must point to RSA_size(\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 \s-1SSL\s0 signature (\s-1MD5\s0 and \s-1SHA1\s0 message digests with \s-1PKCS\s0 #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"
.IX Header "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"
.IX Header "BUGS"
Certain signatures with an improper algorithm identifier are accepted
for compatibility with SSLeay 0.4.5 :\-)
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
openssl_err(3), objects(3), openssl_rsa(3),
RSA_private_encrypt(3),
RSA_public_decrypt(3) 
.SH "HISTORY"
.IX Header "HISTORY"
\&\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay
and OpenSSL.