Upgrade to OpenSSL 0.9.8h.
[dragonfly.git] / secure / lib / libcrypto / man / RSA_sign.3
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129.\" ========================================================================
130.\"
131.IX Title "RSA_sign 3"
aac4ff6f 132.TH RSA_sign 3 "2008-09-06" "0.9.8h" "OpenSSL"
984263bc 133.SH "NAME"
74dab6c2 134RSA_sign, RSA_verify \- RSA signatures
984263bc 135.SH "SYNOPSIS"
8b0cefbb 136.IX Header "SYNOPSIS"
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137.Vb 1
138\& #include <openssl/rsa.h>
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139.Ve
140.PP
141.Vb 2
a561f9ff 142\& int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
984263bc 143\& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
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144.Ve
145.PP
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a561f9ff 147\& int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
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148\& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
149.Ve
150.SH "DESCRIPTION"
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151.IX Header "DESCRIPTION"
152\&\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
153private key \fBrsa\fR as specified in \s-1PKCS\s0 #1 v2.0. It stores the
984263bc 154signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
8b0cefbb 155must point to RSA_size(\fBrsa\fR) bytes of memory.
984263bc 156.PP
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157\&\fBtype\fR denotes the message digest algorithm that was used to generate
158\&\fBm\fR. It usually is one of \fBNID_sha1\fR, \fBNID_ripemd160\fR and \fBNID_md5\fR;
159see \fIobjects\fR\|(3) for details. If \fBtype\fR is \fBNID_md5_sha1\fR,
160an \s-1SSL\s0 signature (\s-1MD5\s0 and \s-1SHA1\s0 message digests with \s-1PKCS\s0 #1 padding
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161and no algorithm identifier) is created.
162.PP
8b0cefbb 163\&\fIRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
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164matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes
165the message digest algorithm that was used to generate the signature.
8b0cefbb 166\&\fBrsa\fR is the signer's public key.
984263bc 167.SH "RETURN VALUES"
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168.IX Header "RETURN VALUES"
169\&\fIRSA_sign()\fR returns 1 on success, 0 otherwise. \fIRSA_verify()\fR returns 1
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170on successful verification, 0 otherwise.
171.PP
8b0cefbb 172The error codes can be obtained by \fIERR_get_error\fR\|(3).
984263bc 173.SH "BUGS"
8b0cefbb 174.IX Header "BUGS"
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175Certain signatures with an improper algorithm identifier are accepted
176for compatibility with SSLeay 0.4.5 :\-)
177.SH "CONFORMING TO"
74dab6c2 178.IX Header "CONFORMING TO"
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179\&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
180.SH "SEE ALSO"
74dab6c2 181.IX Header "SEE ALSO"
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182\&\fIERR_get_error\fR\|(3), \fIobjects\fR\|(3),
183\&\fIrsa\fR\|(3), \fIRSA_private_encrypt\fR\|(3),
aac4ff6f 184\&\fIRSA_public_decrypt\fR\|(3)
8b0cefbb 185.SH "HISTORY"
74dab6c2 186.IX Header "HISTORY"
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187\&\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay
188and OpenSSL.