101 lines
3.5 KiB
HTML
Executable File
101 lines
3.5 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_copy</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="#see_also">SEE ALSO</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_copy, BN_dup, BN_with_flags - copy BIGNUMs</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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BIGNUM *BN_copy(BIGNUM *to, const BIGNUM *from);</pre>
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<pre>
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BIGNUM *BN_dup(const BIGNUM *from);</pre>
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<pre>
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void BN_with_flags(BIGNUM *dest, const BIGNUM *b, int flags);</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_copy()</code> copies <strong>from</strong> to <strong>to</strong>. <code>BN_dup()</code> creates a new <strong>BIGNUM</strong>
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containing the value <strong>from</strong>.</p>
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<p>BN_with_flags creates a <strong>temporary</strong> shallow copy of <strong>b</strong> in <strong>dest</strong>. It places
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significant restrictions on the copied data. Applications that do no adhere to
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these restrictions may encounter unexpected side effects or crashes. For that
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reason use of this function is discouraged. Any flags provided in <strong>flags</strong> will
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be set in <strong>dest</strong> in addition to any flags already set in <strong>b</strong>. For example this
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might commonly be used to create a temporary copy of a BIGNUM with the
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<strong>BN_FLG_CONSTTIME</strong> flag set for constant time operations. The temporary copy in
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<strong>dest</strong> will share some internal state with <strong>b</strong>. For this reason the following
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restrictions apply to the use of <strong>dest</strong>:</p>
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<ul>
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<li>
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<p><strong>dest</strong> should be a newly allocated BIGNUM obtained via a call to <code>BN_new()</code>. It
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should not have been used for other purposes or initialised in any way.</p>
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</li>
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<li>
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<p><strong>dest</strong> must only be used in "read-only" operations, i.e. typically those
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functions where the relevant parameter is declared "const".</p>
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</li>
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<li>
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<p><strong>dest</strong> must be used and freed before any further subsequent use of <strong>b</strong></p>
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</li>
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</ul>
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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><code>BN_copy()</code> returns <strong>to</strong> on success, NULL on error. <code>BN_dup()</code> returns
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the new <strong>BIGNUM</strong>, and NULL on error. The error codes can be obtained
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by <em>ERR_get_error(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="see_also">SEE ALSO</a></h1>
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<p><em>ERR_get_error(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="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2000-2017 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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