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[dragonfly.git] / secure / lib / libcrypto / man / RSA_sign.3
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42.ds -- \(*W-
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48''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
49''' \*(L" and \*(R", except that they are used on ".xx" lines,
50''' such as .IP and .SH, which do another additional levels of
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80.\" If the F register is turned on, we'll generate
81.\" index entries out stderr for the following things:
82.\" TH Title
83.\" SH Header
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96.TH RSA_sign 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
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188.\}
189.rm #[ #] #H #V #F C
984263bc 190.SH "NAME"
74dab6c2 191RSA_sign, RSA_verify \- RSA signatures
984263bc 192.SH "SYNOPSIS"
74dab6c2 193.PP
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194.Vb 1
195\& #include <openssl/rsa.h>
196.Ve
197.Vb 2
198\& int RSA_sign(int type, unsigned char *m, unsigned int m_len,
199\& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
200.Ve
201.Vb 2
202\& int RSA_verify(int type, unsigned char *m, unsigned int m_len,
203\& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
204.Ve
205.SH "DESCRIPTION"
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206\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
207private key \fBrsa\fR as specified in PKCS #1 v2.0. It stores the
984263bc 208signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
74dab6c2 209must point to \fIRSA_size\fR\|(\fBrsa\fR) bytes of memory.
984263bc 210.PP
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211\fBtype\fR denotes the message digest algorithm that was used to generate
212\fBm\fR. It usually is one of \fBNID_sha1\fR, \fBNID_ripemd160\fR and \fBNID_md5\fR;
984263bc 213see objects(3) for details. If \fBtype\fR is \fBNID_md5_sha1\fR,
74dab6c2 214an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
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215and no algorithm identifier) is created.
216.PP
74dab6c2 217\fIRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
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218matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes
219the message digest algorithm that was used to generate the signature.
74dab6c2 220\fBrsa\fR is the signer's public key.
984263bc 221.SH "RETURN VALUES"
74dab6c2 222\fIRSA_sign()\fR returns 1 on success, 0 otherwise. \fIRSA_verify()\fR returns 1
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223on successful verification, 0 otherwise.
224.PP
225The error codes can be obtained by ERR_get_error(3).
226.SH "BUGS"
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227Certain signatures with an improper algorithm identifier are accepted
228for compatibility with SSLeay 0.4.5 :\-)
229.SH "CONFORMING TO"
74dab6c2 230SSL, PKCS #1 v2.0
984263bc 231.SH "SEE ALSO"
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232ERR_get_error(3), objects(3),
233rsa(3), RSA_private_encrypt(3),
234RSA_public_decrypt(3)
235.SH "HISTORY"
74dab6c2 236\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay
984263bc 237and OpenSSL.
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238
239.rn }` ''
240.IX Title "RSA_sign 3"
241.IX Name "RSA_sign, RSA_verify - RSA signatures"
242
243.IX Header "NAME"
244
245.IX Header "SYNOPSIS"
246
247.IX Header "DESCRIPTION"
248
249.IX Header "RETURN VALUES"
250
251.IX Header "BUGS"
252
253.IX Header "CONFORMING TO"
254
255.IX Header "SEE ALSO"
256
257.IX Header "HISTORY"
258