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DSA_do_verify.3ssl
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" DSA_do_sign, DSA_do_verify \- raw DSA signature operations .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/dsa.h> \& \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); \& \& int DSA_do_verify(const unsigned char *dgst, int dgst_len, \& DSA_SIG *sig, DSA *dsa); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBDSA_do_sign()\fR computes a digital signature on the \fBlen\fR byte message digest \fBdgst\fR using the private key \fBdsa\fR and returns it in a newly allocated \fB\s-1DSA_SIG\s0\fR structure. .PP \&\fBDSA_sign_setup\fR\|(3) may be used to precompute part of the signing operation for each signature in case signature generation is time-critical. .PP \&\fBDSA_do_verify()\fR verifies that the signature \fBsig\fR matches a given message digest \fBdgst\fR of size \fBlen\fR. \fBdsa\fR is the signer's public key. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBDSA_do_sign()\fR returns the signature, \s-1NULL\s0 on error. \fBDSA_do_verify()\fR returns 1 for a valid signature, 0 for an incorrect signature and \-1 on error. The error codes can be obtained by \&\fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBdsa\fR\|(3), \fBERR_get_error\fR\|(3), \fBrand\fR\|(3), \&\fBDSA_SIG_new\fR\|(3), \&\fBDSA_sign\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBDSA_do_sign()\fR and \fBDSA_do_verify()\fR were added in OpenSSL 0.9.3.
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