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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DH_size</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <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> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and security bits</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/dh.h></pre> <pre> int DH_size(const DH *dh);</pre> <pre> int DH_bits(const DH *dh);</pre> <pre> int DH_security_bits(const DH *dh);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p><code>DH_size()</code> 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 <em>DH_compute_key(3)</em>.</p> <p><code>DH_bits()</code> returns the number of significant bits.</p> <p><strong>dh</strong> and <strong>dh->p</strong> must not be <strong>NULL</strong>.</p> <p><code>DH_security_bits()</code> returns the number of security bits of the given <strong>dh</strong> key. See <em>BN_security_bits(3)</em>.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p><code>DH_size()</code> returns the prime size of Diffie-Hellman in bytes.</p> <p><code>DH_bits()</code> returns the number of bits in the key.</p> <p><code>DH_security_bits()</code> returns the number of security bits.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>DH_new(3)</em>, <em>DH_generate_key(3)</em>, <em>BN_num_bits(3)</em></p> <p> </p> <hr /> <h1><a name="history">HISTORY</a></h1> <p>The <code>DH_bits()</code> function was added in OpenSSL 1.1.0.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></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> </body> </html>