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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>BN_security_bits</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="#notes">NOTES</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>BN_security_bits - returns bits of security based on given numbers</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/bn.h></pre> <pre> int BN_security_bits(int L, int N);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p><code>BN_security_bits()</code> returns the number of bits of security provided by a specific algorithm and a particular key size. The bits of security is defined in NIST SP800-57. Currently, <code>BN_security_bits()</code> support two types of asymmetric algorithms: the FFC (Finite Field Cryptography) and IFC (Integer Factorization Cryptography). For FFC, e.g., DSA and DH, both parameters <strong>L</strong> and <strong>N</strong> are used to decide the bits of security, where <strong>L</strong> is the size of the public key and <strong>N</strong> is the size of the private key. For IFC, e.g., RSA, only <strong>L</strong> is used and it's commonly considered to be the key size (modulus).</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>Number of security bits.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>ECC (Elliptic Curve Cryptography) is not covered by the <code>BN_security_bits()</code> function. The symmetric algorithms are not covered neither.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>DH_security_bits(3)</em>, <em>DSA_security_bits(3)</em>, <em>RSA_security_bits(3)</em></p> <p> </p> <hr /> <h1><a name="history">HISTORY</a></h1> <p>The <code>BN_security_bits()</code> function was added in OpenSSL 1.1.0.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2017-2019 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>