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132 .\" ========================================================================
134 .IX Title "RSA_sign 3"
135 .TH RSA_sign 3 "2010-02-27" "0.9.8m" "OpenSSL"
136 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
137 .\" way too many mistakes in technical documents.
141 RSA_sign, RSA_verify \- RSA signatures
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/rsa.h>
147 \& int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
148 \& unsigned char *sigret, unsigned int *siglen, RSA *rsa);
150 \& int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
151 \& unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
154 .IX Header "DESCRIPTION"
155 \&\fIRSA_sign()\fR signs the message digest \fBm\fR of size \fBm_len\fR using the
156 private key \fBrsa\fR as specified in \s-1PKCS\s0 #1 v2.0. It stores the
157 signature in \fBsigret\fR and the signature size in \fBsiglen\fR. \fBsigret\fR
158 must point to RSA_size(\fBrsa\fR) bytes of memory.
160 \&\fBtype\fR denotes the message digest algorithm that was used to generate
161 \&\fBm\fR. It usually is one of \fBNID_sha1\fR, \fBNID_ripemd160\fR and \fBNID_md5\fR;
162 see \fIobjects\fR\|(3) for details. If \fBtype\fR is \fBNID_md5_sha1\fR,
163 an \s-1SSL\s0 signature (\s-1MD5\s0 and \s-1SHA1\s0 message digests with \s-1PKCS\s0 #1 padding
164 and no algorithm identifier) is created.
166 \&\fIRSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
167 matches a given message digest \fBm\fR of size \fBm_len\fR. \fBtype\fR denotes
168 the message digest algorithm that was used to generate the signature.
169 \&\fBrsa\fR is the signer's public key.
171 .IX Header "RETURN VALUES"
172 \&\fIRSA_sign()\fR returns 1 on success, 0 otherwise. \fIRSA_verify()\fR returns 1
173 on successful verification, 0 otherwise.
175 The error codes can be obtained by \fIERR_get_error\fR\|(3).
178 Certain signatures with an improper algorithm identifier are accepted
179 for compatibility with SSLeay 0.4.5 :\-)
181 .IX Header "CONFORMING TO"
182 \&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
184 .IX Header "SEE ALSO"
185 \&\fIERR_get_error\fR\|(3), \fIobjects\fR\|(3),
186 \&\fIrsa\fR\|(3), \fIRSA_private_encrypt\fR\|(3),
187 \&\fIRSA_public_decrypt\fR\|(3)
190 \&\fIRSA_sign()\fR and \fIRSA_verify()\fR are available in all versions of SSLeay