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134 .\" ========================================================================
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136 .IX Title "DSA_do_sign 3"
137 .TH DSA_do_sign 3 "2002-09-25" "1.1.0-dev" "OpenSSL"
138 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
139 .\" way too many mistakes in technical documents.
140 .if n .ad l
141 .nh
142 .SH "NAME"
143 DSA_do_sign, DSA_do_verify \- raw DSA signature operations
144 .SH "LIBRARY"
145 libcrypto, -lcrypto
146 .SH "SYNOPSIS"
147 .IX Header "SYNOPSIS"
148 .Vb 1
149 \& #include <openssl/dsa.h>
150 \&
151 \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
152 \&
153 \& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
154 \& DSA_SIG *sig, DSA *dsa);
155 .Ve
156 .SH "DESCRIPTION"
157 .IX Header "DESCRIPTION"
158 \&\fIDSA_do_sign()\fR computes a digital signature on the \fBlen\fR byte message
159 digest \fBdgst\fR using the private key \fBdsa\fR and returns it in a
160 newly allocated \fB\s-1DSA_SIG\s0\fR structure.
161 .PP
162 \&\fIDSA_sign_setup\fR\|(3) may be used to precompute part
163 of the signing operation in case signature generation is
164 time-critical.
165 .PP
166 \&\fIDSA_do_verify()\fR verifies that the signature \fBsig\fR matches a given
167 message digest \fBdgst\fR of size \fBlen\fR. \fBdsa\fR is the signer's public
168 key.
169 .SH "RETURN VALUES"
170 .IX Header "RETURN VALUES"
171 \&\fIDSA_do_sign()\fR returns the signature, \s-1NULL\s0 on error. \fIDSA_do_verify()\fR
172 returns 1 for a valid signature, 0 for an incorrect signature and \-1
173 on error. The error codes can be obtained by
174 \&\fIERR_get_error\fR\|(3).
175 .SH "SEE ALSO"
176 .IX Header "SEE ALSO"
177 \&\fIopenssl_dsa\fR\|(3), \fIERR_get_error\fR\|(3), \fIopenssl_rand\fR\|(3),
178 \&\fIDSA_SIG_new\fR\|(3),
179 \&\fIDSA_sign\fR\|(3)
180 .SH "HISTORY"
181 .IX Header "HISTORY"
182 \&\fIDSA_do_sign()\fR and \fIDSA_do_verify()\fR were added in OpenSSL 0.9.3.