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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
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+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
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+.\" ========================================================================
+.\"
+.IX Title "DSA_DUP_DH 3ossl"
+.TH DSA_DUP_DH 3ossl 2025-09-30 3.5.4 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 \fBOPENSSL_API_COMPAT\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 EVP_PKEY APIs for Diffie-Hellman
+operations.
+.PP
+\&\fBDSA_dup_DH()\fR duplicates DSA parameters/keys as DH parameters/keys. q
+is lost during that conversion, but the resulting DH parameters
+contain its length.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBDSA_dup_DH()\fR returns the new \fBDH\fR structure, and NULL 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 "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+<https://www.openssl.org/source/license.html>.