106 lines
3.5 KiB
HTML
Executable File
106 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>RAND_set_rand_method</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="#the_rand_method_structure">THE RAND_METHOD STRUCTURE</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>RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL - select RAND method</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/rand.h></pre>
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<pre>
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RAND_METHOD *RAND_OpenSSL(void);</pre>
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<pre>
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int RAND_set_rand_method(const RAND_METHOD *meth);</pre>
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<pre>
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const RAND_METHOD *RAND_get_rand_method(void);</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>A <strong>RAND_METHOD</strong> specifies the functions that OpenSSL uses for random number
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generation.</p>
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<p><code>RAND_OpenSSL()</code> returns the default <strong>RAND_METHOD</strong> implementation by OpenSSL.
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This implementation ensures that the PRNG state is unique for each thread.</p>
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<p>If an <strong>ENGINE</strong> is loaded that provides the RAND API, however, it will
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be used instead of the method returned by <code>RAND_OpenSSL()</code>.</p>
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<p><code>RAND_set_rand_method()</code> makes <strong>meth</strong> the method for PRNG use. If an
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ENGINE was providing the method, it will be released first.</p>
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<p><code>RAND_get_rand_method()</code> returns a pointer to the current <strong>RAND_METHOD</strong>.</p>
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<p>
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</p>
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<hr />
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<h1><a name="the_rand_method_structure">THE RAND_METHOD STRUCTURE</a></h1>
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<pre>
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typedef struct rand_meth_st {
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void (*seed)(const void *buf, int num);
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int (*bytes)(unsigned char *buf, int num);
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void (*cleanup)(void);
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void (*add)(const void *buf, int num, int randomness);
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int (*pseudorand)(unsigned char *buf, int num);
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int (*status)(void);
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} RAND_METHOD;</pre>
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<p>The fields point to functions that are used by, in order,
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<code>RAND_seed()</code>, <code>RAND_bytes()</code>, internal RAND cleanup, <code>RAND_add()</code>, <code>RAND_pseudo_rand()</code>
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and <code>RAND_status()</code>.
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Each pointer may be NULL if the function is not implemented.</p>
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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>RAND_set_rand_method()</code> returns 1 on success and 0 on failure.
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<code>RAND_get_rand_method()</code> and <code>RAND_OpenSSL()</code> return pointers to the respective
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methods.</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>RAND_bytes(3)</em>,
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<em>ENGINE_by_id(3)</em>,
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<em>RAND(7)</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 2000-2018 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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