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<title>RAND_DRBG_set_ex_data</title>
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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="#NOTES">NOTES</a></li>
<li><a href="#SEE-ALSO">SEE ALSO</a></li>
<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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<h1 id="NAME">NAME</h1>
<p>RAND_DRBG_set_ex_data, RAND_DRBG_get_ex_data, RAND_DRBG_get_ex_new_index - store and retrieve extra data from the DRBG instance</p>
<h1 id="SYNOPSIS">SYNOPSIS</h1>
<pre><code> #include <openssl/rand_drbg.h>
int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *data);
void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);
int RAND_DRBG_get_ex_new_index(long argl, void *argp,
CRYPTO_EX_new *new_func,
CRYPTO_EX_dup *dup_func,
CRYPTO_EX_free *free_func);</code></pre>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>RAND_DRBG_set_ex_data() enables an application to store arbitrary application specific data <b>data</b> in a RAND_DRBG instance <b>drbg</b>. The index <b>idx</b> should be a value previously returned from a call to RAND_DRBG_get_ex_new_index().</p>
<p>RAND_DRBG_get_ex_data() retrieves application specific data previously stored in an RAND_DRBG instance <b>drbg</b>. The <b>idx</b> value should be the same as that used when originally storing the data.</p>
<p>For more detailed information see <a href="../man3/CRYPTO_get_ex_data.html">CRYPTO_get_ex_data(3)</a> and <a href="../man3/CRYPTO_set_ex_data.html">CRYPTO_set_ex_data(3)</a> which implement these functions and <a href="../man3/CRYPTO_get_ex_new_index.html">CRYPTO_get_ex_new_index(3)</a> for generating a unique index.</p>
<h1 id="RETURN-VALUES">RETURN VALUES</h1>
<p>RAND_DRBG_set_ex_data() returns 1 for success or 0 for failure.</p>
<p>RAND_DRBG_get_ex_data() returns the previously stored value or NULL on failure. NULL may also be a valid value.</p>
<h1 id="NOTES">NOTES</h1>
<p>RAND_DRBG_get_ex_new_index(...) is implemented as a macro and equivalent to CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG,...).</p>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p><a href="../man3/CRYPTO_get_ex_data.html">CRYPTO_get_ex_data(3)</a>, <a href="../man3/CRYPTO_set_ex_data.html">CRYPTO_set_ex_data(3)</a>, <a href="../man3/CRYPTO_get_ex_new_index.html">CRYPTO_get_ex_new_index(3)</a>, <a href="../man7/RAND_DRBG.html">RAND_DRBG(7)</a></p>
<h1 id="COPYRIGHT">COPYRIGHT</h1>
<p>Copyright 2017-2018 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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