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135 .\" ========================================================================
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137 .IX Title "DSA_do_sign 3"
138 .TH DSA_do_sign 3 "2009-07-19" "1.0.1n" "OpenSSL"
139 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
140 .\" way too many mistakes in technical documents.
141 .if n .ad l
142 .nh
143 .SH "NAME"
144 DSA_do_sign, DSA_do_verify \- raw DSA signature operations
145 .SH "LIBRARY"
146 libcrypto, -lcrypto
147 .SH "SYNOPSIS"
148 .IX Header "SYNOPSIS"
149 .Vb 1
150 \& #include <openssl/dsa.h>
151 \&
152 \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
153 \&
154 \& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
155 \& DSA_SIG *sig, DSA *dsa);
156 .Ve
157 .SH "DESCRIPTION"
158 .IX Header "DESCRIPTION"
159 \&\fIDSA_do_sign()\fR computes a digital signature on the \fBlen\fR byte message
160 digest \fBdgst\fR using the private key \fBdsa\fR and returns it in a
161 newly allocated \fB\s-1DSA_SIG\s0\fR structure.
162 .PP
163 \&\fIDSA_sign_setup\fR\|(3) may be used to precompute part
164 of the signing operation in case signature generation is
165 time-critical.
166 .PP
167 \&\fIDSA_do_verify()\fR verifies that the signature \fBsig\fR matches a given
168 message digest \fBdgst\fR of size \fBlen\fR. \fBdsa\fR is the signer's public
169 key.
170 .SH "RETURN VALUES"
171 .IX Header "RETURN VALUES"
172 \&\fIDSA_do_sign()\fR returns the signature, \s-1NULL\s0 on error. \fIDSA_do_verify()\fR
173 returns 1 for a valid signature, 0 for an incorrect signature and \-1
174 on error. The error codes can be obtained by
175 \&\fIERR_get_error\fR\|(3).
176 .SH "SEE ALSO"
177 .IX Header "SEE ALSO"
178 \&\fIopenssl_dsa\fR\|(3), \fIERR_get_error\fR\|(3), \fIopenssl_rand\fR\|(3),
179 \&\fIDSA_SIG_new\fR\|(3),
180 \&\fIDSA_sign\fR\|(3)
181 .SH "HISTORY"
182 .IX Header "HISTORY"
183 \&\fIDSA_do_sign()\fR and \fIDSA_do_verify()\fR were added in OpenSSL 0.9.3.