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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_add_word</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="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic functions on BIGNUMs with integers</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/bn.h></pre> <pre> int BN_add_word(BIGNUM *a, BN_ULONG w);</pre> <pre> int BN_sub_word(BIGNUM *a, BN_ULONG w);</pre> <pre> int BN_mul_word(BIGNUM *a, BN_ULONG w);</pre> <pre> BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);</pre> <pre> BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>These functions perform arithmetic operations on BIGNUMs with unsigned integers. They are much more efficient than the normal BIGNUM arithmetic operations.</p> <p><code>BN_add_word()</code> adds <strong>w</strong> to <strong>a</strong> (<code>a+=w</code>).</p> <p><code>BN_sub_word()</code> subtracts <strong>w</strong> from <strong>a</strong> (<code>a-=w</code>).</p> <p><code>BN_mul_word()</code> multiplies <strong>a</strong> and <strong>w</strong> (<code>a*=w</code>).</p> <p><code>BN_div_word()</code> divides <strong>a</strong> by <strong>w</strong> (<code>a/=w</code>) and returns the remainder.</p> <p><code>BN_mod_word()</code> returns the remainder of <strong>a</strong> divided by <strong>w</strong> (<code>a%w</code>).</p> <p>For <code>BN_div_word()</code> and <code>BN_mod_word()</code>, <strong>w</strong> must not be 0.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p><code>BN_add_word()</code>, <code>BN_sub_word()</code> and <code>BN_mul_word()</code> return 1 for success, 0 on error. The error codes can be obtained by <em>ERR_get_error(3)</em>.</p> <p><code>BN_mod_word()</code> and <code>BN_div_word()</code> return <strong>a</strong>%<strong>w</strong> on success and <strong>(BN_ULONG)-1</strong> if an error occurred.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>ERR_get_error(3)</em>, <em>BN_add(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2000-2017 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>