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131 .IX Title "DSA_do_sign 3"
132 .TH DSA_do_sign 3 "2006-11-19" "0.9.8d" "OpenSSL"
134 DSA_do_sign, DSA_do_verify \- raw DSA signature operations
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/dsa.h>
142 \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
146 \& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
147 \& DSA_SIG *sig, DSA *dsa);
150 .IX Header "DESCRIPTION"
151 \&\fIDSA_do_sign()\fR computes a digital signature on the \fBlen\fR byte message
152 digest \fBdgst\fR using the private key \fBdsa\fR and returns it in a
153 newly allocated \fB\s-1DSA_SIG\s0\fR structure.
155 \&\fIDSA_sign_setup\fR\|(3) may be used to precompute part
156 of the signing operation in case signature generation is
159 \&\fIDSA_do_verify()\fR verifies that the signature \fBsig\fR matches a given
160 message digest \fBdgst\fR of size \fBlen\fR. \fBdsa\fR is the signer's public
163 .IX Header "RETURN VALUES"
164 \&\fIDSA_do_sign()\fR returns the signature, \s-1NULL\s0 on error. \fIDSA_do_verify()\fR
165 returns 1 for a valid signature, 0 for an incorrect signature and \-1
166 on error. The error codes can be obtained by
167 \&\fIERR_get_error\fR\|(3).
169 .IX Header "SEE ALSO"
170 \&\fIdsa\fR\|(3), \fIERR_get_error\fR\|(3), \fIrand\fR\|(3),
171 \&\fIDSA_SIG_new\fR\|(3),
172 \&\fIDSA_sign\fR\|(3)
175 \&\fIDSA_do_sign()\fR and \fIDSA_do_verify()\fR were added in OpenSSL 0.9.3.