93 lines
2.9 KiB
HTML
Executable File
93 lines
2.9 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>BN_security_bits</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#history">HISTORY</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>BN_security_bits - returns bits of security based on given numbers</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/bn.h></pre>
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<pre>
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int BN_security_bits(int L, int N);</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p><code>BN_security_bits()</code> returns the number of bits of security provided by a
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specific algorithm and a particular key size. The bits of security is
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defined in NIST SP800-57. Currently, <code>BN_security_bits()</code> support two types
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of asymmetric algorithms: the FFC (Finite Field Cryptography) and IFC
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(Integer Factorization Cryptography). For FFC, e.g., DSA and DH, both
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parameters <strong>L</strong> and <strong>N</strong> are used to decide the bits of security, where
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<strong>L</strong> is the size of the public key and <strong>N</strong> is the size of the private
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key. For IFC, e.g., RSA, only <strong>L</strong> is used and it's commonly considered
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to be the key size (modulus).</p>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p>Number of security bits.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>ECC (Elliptic Curve Cryptography) is not covered by the <code>BN_security_bits()</code>
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function. The symmetric algorithms are not covered neither.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>DH_security_bits(3)</em>, <em>DSA_security_bits(3)</em>, <em>RSA_security_bits(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="history">HISTORY</a></h1>
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<p>The <code>BN_security_bits()</code> function was added in OpenSSL 1.1.0.</p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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