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<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>
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<h1><a name="name">NAME</a></h1>
<p>BN_mod_inverse - compute inverse modulo n</p>
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<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include <openssl/bn.h></pre>
<pre>
BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
BN_CTX *ctx);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p><code>BN_mod_inverse()</code> computes the inverse of <strong>a</strong> modulo <strong>n</strong>
places the result in <strong>r</strong> (<code>(a*r)%n==1</code>). If <strong>r</strong> is NULL,
a new <strong>BIGNUM</strong> is created.</p>
<p><strong>ctx</strong> is a previously allocated <strong>BN_CTX</strong> used for temporary
variables. <strong>r</strong> may be the same <strong>BIGNUM</strong> as <strong>a</strong> or <strong>n</strong>.</p>
<p>
</p>
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<h1><a name="return_values">RETURN VALUES</a></h1>
<p><code>BN_mod_inverse()</code> returns the <strong>BIGNUM</strong> containing the inverse, and
NULL on error. The error codes can be obtained by <em>ERR_get_error(3)</em>.</p>
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</p>
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<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>ERR_get_error(3)</em>, <em>BN_add(3)</em></p>
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</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>
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