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131 .IX Title "DSA_SIGN 3"
132 .TH DSA_SIGN 3 "2018-11-20" "1.1.1a" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 DSA_sign, DSA_sign_setup, DSA_verify \- DSA signatures
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/dsa.h>
144 \& int DSA_sign(int type, const unsigned char *dgst, int len,
145 \& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
147 \& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp);
149 \& int DSA_verify(int type, const unsigned char *dgst, int len,
150 \& unsigned char *sigbuf, int siglen, DSA *dsa);
153 .IX Header "DESCRIPTION"
154 \&\fIDSA_sign()\fR computes a digital signature on the \fBlen\fR byte message
155 digest \fBdgst\fR using the private key \fBdsa\fR and places its \s-1ASN.1 DER\s0
156 encoding at \fBsigret\fR. The length of the signature is places in
157 *\fBsiglen\fR. \fBsigret\fR must point to DSA_size(\fBdsa\fR) bytes of memory.
159 \&\fIDSA_sign_setup()\fR is defined only for backward binary compatibility and
161 Since OpenSSL 1.1.0 the \s-1DSA\s0 type is opaque and the output of
162 \&\fIDSA_sign_setup()\fR cannot be used anyway: calling this function will only
163 cause overhead, and does not affect the actual signature
166 \&\fIDSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
167 matches a given message digest \fBdgst\fR of size \fBlen\fR.
168 \&\fBdsa\fR is the signer's public key.
170 The \fBtype\fR parameter is ignored.
172 The \s-1PRNG\s0 must be seeded before \fIDSA_sign()\fR (or \fIDSA_sign_setup()\fR)
175 .IX Header "RETURN VALUES"
176 \&\fIDSA_sign()\fR and \fIDSA_sign_setup()\fR return 1 on success, 0 on error.
177 \&\fIDSA_verify()\fR returns 1 for a valid signature, 0 for an incorrect
178 signature and \-1 on error. The error codes can be obtained by
179 \&\fIERR_get_error\fR\|(3).
181 .IX Header "CONFORMING TO"
182 \&\s-1US\s0 Federal Information Processing Standard \s-1FIPS 186\s0 (Digital Signature
183 Standard, \s-1DSS\s0), \s-1ANSI X9.30\s0
185 .IX Header "SEE ALSO"
186 \&\fIDSA_new\fR\|(3), \fIERR_get_error\fR\|(3), \fIRAND_bytes\fR\|(3),
187 \&\fIDSA_do_sign\fR\|(3)
189 .IX Header "COPYRIGHT"
190 Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
192 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
193 this file except in compliance with the License. You can obtain a copy
194 in the file \s-1LICENSE\s0 in the source distribution or at
195 <https://www.openssl.org/source/license.html>.