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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>RAND_set_rand_method</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <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="#THE-RAND_METHOD-STRUCTURE">THE RAND_METHOD STRUCTURE</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> </ul> <h1 id="NAME">NAME</h1> <p>RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL - select RAND method</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/rand.h> RAND_METHOD *RAND_OpenSSL(void); int RAND_set_rand_method(const RAND_METHOD *meth); const RAND_METHOD *RAND_get_rand_method(void);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>A <b>RAND_METHOD</b> specifies the functions that OpenSSL uses for random number generation.</p> <p>RAND_OpenSSL() returns the default <b>RAND_METHOD</b> implementation by OpenSSL. This implementation ensures that the PRNG state is unique for each thread.</p> <p>If an <b>ENGINE</b> is loaded that provides the RAND API, however, it will be used instead of the method returned by RAND_OpenSSL().</p> <p>RAND_set_rand_method() makes <b>meth</b> the method for PRNG use. If an ENGINE was providing the method, it will be released first.</p> <p>RAND_get_rand_method() returns a pointer to the current <b>RAND_METHOD</b>.</p> <h1 id="THE-RAND_METHOD-STRUCTURE">THE RAND_METHOD STRUCTURE</h1> <pre><code> typedef struct rand_meth_st { int (*seed)(const void *buf, int num); int (*bytes)(unsigned char *buf, int num); void (*cleanup)(void); int (*add)(const void *buf, int num, double entropy); int (*pseudorand)(unsigned char *buf, int num); int (*status)(void); } RAND_METHOD;</code></pre> <p>The fields point to functions that are used by, in order, RAND_seed(), RAND_bytes(), internal RAND cleanup, RAND_add(), RAND_pseudo_rand() and RAND_status(). Each pointer may be NULL if the function is not implemented.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>RAND_set_rand_method() returns 1 on success and 0 on failure. RAND_get_rand_method() and RAND_OpenSSL() return pointers to the respective methods.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/RAND_bytes.html">RAND_bytes(3)</a>, <a href="../man3/ENGINE_by_id.html">ENGINE_by_id(3)</a>, <a href="../man7/RAND.html">RAND(7)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2000-2020 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> </body> </html>
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