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<title>DSA_dup_DH</title>
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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#NOTE">NOTE</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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<h1 id="NAME">NAME</h1>

<p>DSA_dup_DH - create a DH structure out of DSA structure</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>#include &lt;openssl/dsa.h&gt;</code></pre>

<p>The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining <b>OPENSSL_API_COMPAT</b> with a suitable version value, see <a href="../man7/openssl_user_macros.html">openssl_user_macros(7)</a>:</p>

<pre><code>DH *DSA_dup_DH(const DSA *r);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The function described on this page is deprecated. There is no direct replacement, applications should use the EVP_PKEY APIs for Diffie-Hellman operations.</p>

<p>DSA_dup_DH() duplicates DSA parameters/keys as DH parameters/keys. q is lost during that conversion, but the resulting DH parameters contain its length.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>DSA_dup_DH() returns the new <b>DH</b> structure, and NULL on error. The error codes can be obtained by <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>.</p>

<h1 id="NOTE">NOTE</h1>

<p>Be careful to avoid small subgroup attacks when using this.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/DH_new.html">DH_new(3)</a>, <a href="../man3/DSA_new.html">DSA_new(3)</a>, <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>This function was deprecated in OpenSSL 3.0.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the Apache License 2.0 (the &quot;License&quot;). 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 <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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