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Editing: RSA_sign.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_sign, RSA_verify \- RSA signatures .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/rsa.h> \& \& int RSA_sign(int type, const unsigned char *m, unsigned int m_len, \& unsigned char *sigret, unsigned int *siglen, RSA *rsa); \& \& int RSA_verify(int type, const unsigned char *m, unsigned int m_len, \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBRSA_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. Note that \s-1PKCS\s0 #1 adds meta-data, placing limits on the size of the key that can be used. See \fBRSA_private_encrypt\fR\|(3) for lower-level operations. .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 \fBobjects\fR\|(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 \&\fBRSA_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" \&\fBRSA_sign()\fR returns 1 on success, 0 otherwise. \fBRSA_verify()\fR returns 1 on successful verification, 0 otherwise. .PP The error codes can be obtained by \fBERR_get_error\fR\|(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, PKCS\s0 #1 v2.0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3), \fBobjects\fR\|(3), \&\fBrsa\fR\|(3), \fBRSA_private_encrypt\fR\|(3), \&\fBRSA_public_decrypt\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBRSA_sign()\fR and \fBRSA_verify()\fR are available in all versions of SSLeay and OpenSSL.
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