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131 .IX Title "RSA_sign 3"
132 .TH RSA_sign 3 "2006-11-19" "0.9.8d" "OpenSSL"
134 RSA_sign, RSA_verify \- RSA signatures
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/rsa.h>
142 \& int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
143 \& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
147 \& int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
148 \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
151 .IX Header "DESCRIPTION"
152 \&\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
153 private key \fBrsa\fR as specified in \s-1PKCS\s0 #1 v2.0. It stores the
154 signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
155 must point to RSA_size(\fBrsa\fR) bytes of memory.
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;
159 see \fIobjects\fR\|(3) for details. If \fBtype\fR is \fBNID_md5_sha1\fR,
160 an \s-1SSL\s0 signature (\s-1MD5\s0 and \s-1SHA1\s0 message digests with \s-1PKCS\s0 #1 padding
161 and no algorithm identifier) is created.
163 \&\fIRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
164 matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes
165 the message digest algorithm that was used to generate the signature.
166 \&\fBrsa\fR is the signer's public key.
168 .IX Header "RETURN VALUES"
169 \&\fIRSA_sign()\fR returns 1 on success, 0 otherwise. \fIRSA_verify()\fR returns 1
170 on successful verification, 0 otherwise.
172 The error codes can be obtained by \fIERR_get_error\fR\|(3).
175 Certain signatures with an improper algorithm identifier are accepted
176 for compatibility with SSLeay 0.4.5 :\-)
178 .IX Header "CONFORMING TO"
179 \&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
181 .IX Header "SEE ALSO"
182 \&\fIERR_get_error\fR\|(3), \fIobjects\fR\|(3),
183 \&\fIrsa\fR\|(3), \fIRSA_private_encrypt\fR\|(3),
184 \&\fIRSA_public_decrypt\fR\|(3)
187 \&\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay