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<title>DH_size</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="#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>DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and security bits</p>
<h1 id="SYNOPSIS">SYNOPSIS</h1>
<pre><code> #include <openssl/dh.h>
int DH_size(const DH *dh);
int DH_bits(const DH *dh);
int DH_security_bits(const DH *dh);</code></pre>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>DH_size() returns the Diffie-Hellman prime size in bytes. It can be used to determine how much memory must be allocated for the shared secret computed by <a href="../man3/DH_compute_key.html">DH_compute_key(3)</a>.</p>
<p>DH_bits() returns the number of significant bits.</p>
<p><b>dh</b> and <b>dh->p</b> must not be <b>NULL</b>.</p>
<p>DH_security_bits() returns the number of security bits of the given <b>dh</b> key. See <a href="../man3/BN_security_bits.html">BN_security_bits(3)</a>.</p>
<h1 id="RETURN-VALUES">RETURN VALUES</h1>
<p>DH_size() returns the prime size of Diffie-Hellman in bytes.</p>
<p>DH_bits() returns the number of bits in the key.</p>
<p>DH_security_bits() returns the number of security bits.</p>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p><a href="../man3/DH_new.html">DH_new(3)</a>, <a href="../man3/DH_generate_key.html">DH_generate_key(3)</a>, <a href="../man3/BN_num_bits.html">BN_num_bits(3)</a></p>
<h1 id="HISTORY">HISTORY</h1>
<p>The DH_bits() function was added in OpenSSL 1.1.0.</p>
<h1 id="COPYRIGHT">COPYRIGHT</h1>
<p>Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the OpenSSL license (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 <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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