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DSA_sign.3
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.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32 .\" .\" Standard preamble: .\" ======================================================================== .de Sh \" Subsection heading .br .if t .Sp .ne 5 .PP \fB\\$1\fR .PP .. .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. | will give a .\" real vertical bar. \*(C+ will give a nicer C++. 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The length of the signature is places in *\fBsiglen\fR. \fBsigret\fR must point to DSA_size(\fBdsa\fR) bytes of memory. .PP \&\fIDSA_sign_setup()\fR may be used to precompute part of the signing operation in case signature generation is time\-critical. It expects \&\fBdsa\fR to contain \s-1DSA\s0 parameters. It places the precomputed values in newly allocated \fB\s-1BIGNUM\s0\fRs at *\fBkinvp\fR and *\fBrp\fR, after freeing the old ones unless *\fBkinvp\fR and *\fBrp\fR are \s-1NULL\s0. These values may be passed to \fIDSA_sign()\fR in \fBdsa\->kinv\fR and \fBdsa\->r\fR. \&\fBctx\fR is a pre-allocated \fB\s-1BN_CTX\s0\fR or \s-1NULL\s0. .PP \&\fIDSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR matches a given message digest \fBdgst\fR of size \fBlen\fR. \&\fBdsa\fR is the signer's public key. .PP The \fBtype\fR parameter is ignored. .PP The \s-1PRNG\s0 must be seeded before \fIDSA_sign()\fR (or \fIDSA_sign_setup()\fR) is called. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIDSA_sign()\fR and \fIDSA_sign_setup()\fR return 1 on success, 0 on error. \&\fIDSA_verify()\fR returns 1 for a valid signature, 0 for an incorrect signature and \-1 on error. The error codes can be obtained by \&\fIERR_get_error\fR\|(3). .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 186 (Digital Signature Standard, \s-1DSS\s0), \s-1ANSI\s0 X9.30 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIdsa\fR\|(3), \fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \&\fIDSA_do_sign\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fIDSA_sign()\fR and \fIDSA_verify()\fR are available in all versions of SSLeay. \&\fIDSA_sign_setup()\fR was added in SSLeay 0.8.