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RAND_query_egd_bytes.html
<?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_egd</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="#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_egd, RAND_egd_bytes, RAND_query_egd_bytes - query entropy gathering daemon</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/rand.h> int RAND_egd_bytes(const char *path, int num); int RAND_egd(const char *path); int RAND_query_egd_bytes(const char *path, unsigned char *buf, int num);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>On older platforms without a good source of randomness such as <code>/dev/urandom</code>, it is possible to query an Entropy Gathering Daemon (EGD) over a local socket to obtain randomness and seed the OpenSSL RNG. The protocol used is defined by the EGDs available at <a href="http://egd.sourceforge.net/">http://egd.sourceforge.net/</a> or <a href="http://prngd.sourceforge.net">http://prngd.sourceforge.net</a>.</p> <p>RAND_egd_bytes() requests <b>num</b> bytes of randomness from an EGD at the specified socket <b>path</b>, and passes the data it receives into RAND_add(). RAND_egd() is equivalent to RAND_egd_bytes() with <b>num</b> set to 255.</p> <p>RAND_query_egd_bytes() requests <b>num</b> bytes of randomness from an EGD at the specified socket <b>path</b>, where <b>num</b> must be less than 256. If <b>buf</b> is <b>NULL</b>, it is equivalent to RAND_egd_bytes(). If <b>buf</b> is not <b>NULL</b>, then the data is copied to the buffer and RAND_add() is not called.</p> <p>OpenSSL can be configured at build time to try to use the EGD for seeding automatically.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>RAND_egd() and RAND_egd_bytes() return the number of bytes read from the daemon on success, or -1 if the connection failed or the daemon did not return enough data to fully seed the PRNG.</p> <p>RAND_query_egd_bytes() returns the number of bytes read from the daemon on success, or -1 if the connection failed.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/RAND_add.html">RAND_add(3)</a>, <a href="../man3/RAND_bytes.html">RAND_bytes(3)</a>, <a href="../man7/RAND.html">RAND(7)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2000-2018 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> </body> </html>
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