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140 .IX Title "RSA_sign 3"
141 .TH RSA_sign 3 "0.9.6e" "2000-04-13" "OpenSSL"
144 RSA_sign, RSA_verify \- \s-1RSA\s0 signatures
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/rsa.h>
151 \& int RSA_sign(int type, unsigned char *m, unsigned int m_len,
152 \& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
155 \& int RSA_verify(int type, unsigned char *m, unsigned int m_len,
156 \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
159 .IX Header "DESCRIPTION"
160 \&\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
161 private key \fBrsa\fR as specified in \s-1PKCS\s0 #1 v2.0. It stores the
162 signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
163 must point to RSA_size(\fBrsa\fR) bytes of memory.
165 \&\fBtype\fR denotes the message digest algorithm that was used to generate
166 \&\fBm\fR. It usually is one of \fBNID_sha1\fR, \fBNID_ripemd160\fR and \fBNID_md5\fR;
167 see objects(3) for details. If \fBtype\fR is \fBNID_md5_sha1\fR,
168 an \s-1SSL\s0 signature (\s-1MD5\s0 and \s-1SHA1\s0 message digests with \s-1PKCS\s0 #1 padding
169 and no algorithm identifier) is created.
171 \&\fIRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
172 matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes
173 the message digest algorithm that was used to generate the signature.
174 \&\fBrsa\fR is the signer's public key.
176 .IX Header "RETURN VALUES"
177 \&\fIRSA_sign()\fR returns 1 on success, 0 otherwise. \fIRSA_verify()\fR returns 1
178 on successful verification, 0 otherwise.
180 The error codes can be obtained by ERR_get_error(3).
183 Certain signatures with an improper algorithm identifier are accepted
184 for compatibility with SSLeay 0.4.5 :\-)
186 .IX Header "CONFORMING TO"
187 \&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
189 .IX Header "SEE ALSO"
190 err(3), objects(3), rsa(3),
191 RSA_private_encrypt(3),
192 RSA_public_decrypt(3)
195 \&\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay