Android_verify/third_party/android-libs/share/man/man3/DSA_dup_DH.3ossl

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.\" ========================================================================
.\"
.IX Title "DSA_DUP_DH 3ossl"
.TH DSA_DUP_DH 3ossl "2024-09-03" "3.3.2" "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_dup_DH \- create a DH structure out of DSA structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/dsa.h>
.Ve
.PP
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
see \fBopenssl_user_macros\fR\|(7):
.PP
.Vb 1
\& DH *DSA_dup_DH(const DSA *r);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The function described on this page is deprecated. There is no direct
replacement, applications should use the \s-1EVP_PKEY\s0 APIs for Diffie-Hellman
operations.
.PP
\&\fBDSA_dup_DH()\fR duplicates \s-1DSA\s0 parameters/keys as \s-1DH\s0 parameters/keys. q
is lost during that conversion, but the resulting \s-1DH\s0 parameters
contain its length.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBDSA_dup_DH()\fR returns the new \fB\s-1DH\s0\fR structure, and \s-1NULL\s0 on error. The
error codes can be obtained by \fBERR_get_error\fR\|(3).
.SH "NOTE"
.IX Header "NOTE"
Be careful to avoid small subgroup attacks when using this.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBDH_new\fR\|(3), \fBDSA_new\fR\|(3), \fBERR_get_error\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
This function was deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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>.