✏ 编辑: DSA_SIG_get0.3

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.\"
.IX Title "DSA_SIG_NEW 3"
.TH DSA_SIG_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
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.nh
.SH "NAME"
DSA_SIG_get0, DSA_SIG_set0, DSA_SIG_new, DSA_SIG_free \- allocate and free DSA signature objects
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/dsa.h>
\&
\& DSA_SIG *DSA_SIG_new(void);
\& void DSA_SIG_free(DSA_SIG *a);
\& void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
\& int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIDSA_SIG_new()\fR allocates an empty \fB\s-1DSA_SIG\s0\fR structure.
.PP
\&\fIDSA_SIG_free()\fR frees the \fB\s-1DSA_SIG\s0\fR structure and its components. The
values are erased before the memory is returned to the system.
.PP
\&\fIDSA_SIG_get0()\fR returns internal pointers to the \fBr\fR and \fBs\fR values contained
in \fBsig\fR.
.PP
The \fBr\fR and \fBs\fR values can be set by calling \fIDSA_SIG_set0()\fR and passing the
new values for \fBr\fR and \fBs\fR as parameters to the function. Calling this
function transfers the memory management of the values to the \s-1DSA_SIG\s0 object,
and therefore the values that have been passed in should not be freed directly
after this function has been called.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
If the allocation fails, \fIDSA_SIG_new()\fR returns \fB\s-1NULL\s0\fR and sets an
error code that can be obtained by
\&\fIERR_get_error\fR\|(3). Otherwise it returns a pointer
to the newly allocated structure.
.PP
\&\fIDSA_SIG_free()\fR returns no value.
.PP
\&\fIDSA_SIG_set0()\fR returns 1 on success or 0 on failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIDSA_new\fR\|(3), \fIERR_get_error\fR\|(3),
\&\fIDSA_do_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>.

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