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124 .\" ========================================================================
126 .IX Title "RSA_sign 3"
127 .TH RSA_sign 3 "2012-05-10" "1.0.1c" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
133 RSA_sign, RSA_verify \- RSA signatures
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/rsa.h>
139 \& int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
140 \& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
142 \& int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
143 \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
146 .IX Header "DESCRIPTION"
147 \&\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
148 private key \fBrsa\fR as specified in \s-1PKCS\s0 #1 v2.0. It stores the
149 signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
150 must point to RSA_size(\fBrsa\fR) bytes of memory.
152 \&\fBtype\fR denotes the message digest algorithm that was used to generate
153 \&\fBm\fR. It usually is one of \fBNID_sha1\fR, \fBNID_ripemd160\fR and \fBNID_md5\fR;
154 see \fIobjects\fR\|(3) for details. If \fBtype\fR is \fBNID_md5_sha1\fR,
155 an \s-1SSL\s0 signature (\s-1MD5\s0 and \s-1SHA1\s0 message digests with \s-1PKCS\s0 #1 padding
156 and no algorithm identifier) is created.
158 \&\fIRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
159 matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes
160 the message digest algorithm that was used to generate the signature.
161 \&\fBrsa\fR is the signer's public key.
163 .IX Header "RETURN VALUES"
164 \&\fIRSA_sign()\fR returns 1 on success, 0 otherwise. \fIRSA_verify()\fR returns 1
165 on successful verification, 0 otherwise.
167 The error codes can be obtained by \fIERR_get_error\fR\|(3).
170 Certain signatures with an improper algorithm identifier are accepted
171 for compatibility with SSLeay 0.4.5 :\-)
173 .IX Header "CONFORMING TO"
174 \&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
176 .IX Header "SEE ALSO"
177 \&\fIERR_get_error\fR\|(3), \fIobjects\fR\|(3),
178 \&\fIrsa\fR\|(3), \fIRSA_private_encrypt\fR\|(3),
179 \&\fIRSA_public_decrypt\fR\|(3)
182 \&\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay