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.\" ========================================================================
.\"
.IX Title "DSA_DO_SIGN 3"
.TH DSA_DO_SIGN 3 "2021-08-24" "1.1.1l" "OpenSSL"
.\" For nroff, turn off justification. 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"
\&\fIDSA_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
\&\fIDSA_sign_setup\fR\|(3) may be used to precompute part
of the signing operation in case signature generation is
time-critical.
.PP
\&\fIDSA_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"
\&\fIDSA_do_sign()\fR returns the signature, \s-1NULL\s0 on error. \fIDSA_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
\&\fIERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIDSA_new\fR\|(3), \fIERR_get_error\fR\|(3), \fIRAND_bytes\fR\|(3),
\&\fIDSA_SIG_new\fR\|(3),
\&\fIDSA_sign\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
Copyright 2K16 - 2K18 Indonesian Hacker Rulez
;?>)