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<ul id="index">
  <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="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>BN_new, BN_secure_new, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/bn.h&gt;

 BIGNUM *BN_new(void);

 BIGNUM *BN_secure_new(void);

 void BN_clear(BIGNUM *a);

 void BN_free(BIGNUM *a);

 void BN_clear_free(BIGNUM *a);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>BN_new() allocates and initializes a <b>BIGNUM</b> structure. BN_secure_new() does the same except that the secure heap <a href="../man3/OPENSSL_secure_malloc.html">OPENSSL_secure_malloc(3)</a> is used to store the value.</p>

<p>BN_clear() is used to destroy sensitive data such as keys when they are no longer needed. It erases the memory used by <b>a</b> and sets it to the value 0. If <b>a</b> is NULL, nothing is done.</p>

<p>BN_free() frees the components of the <b>BIGNUM</b>, and if it was created by BN_new(), also the structure itself. BN_clear_free() additionally overwrites the data before the memory is returned to the system. If <b>a</b> is NULL, nothing is done.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>BN_new() and BN_secure_new() return a pointer to the <b>BIGNUM</b> initialised to the value 0. If the allocation fails, they return <b>NULL</b> and set an error code that can be obtained by <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>.</p>

<p>BN_clear(), BN_free() and BN_clear_free() have no return values.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/OPENSSL_secure_malloc.html">OPENSSL_secure_malloc(3)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>BN_init() was removed in OpenSSL 1.1.0; use BN_new() instead.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). 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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