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RAND_write_file.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_load_file</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_load_file, RAND_write_file, RAND_file_name - PRNG seed file</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/rand.h> int RAND_load_file(const char *filename, long max_bytes); int RAND_write_file(const char *filename); const char *RAND_file_name(char *buf, size_t num);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>RAND_load_file() reads a number of bytes from file <b>filename</b> and adds them to the PRNG. If <b>max_bytes</b> is nonnegative, up to <b>max_bytes</b> are read; if <b>max_bytes</b> is -1, the complete file is read. Do not load the same file multiple times unless its contents have been updated by RAND_write_file() between reads. Also, note that <b>filename</b> should be adequately protected so that an attacker cannot replace or examine the contents. If <b>filename</b> is not a regular file, then user is considered to be responsible for any side effects, e.g. non-anticipated blocking or capture of controlling terminal.</p> <p>RAND_write_file() writes a number of random bytes (currently 128) to file <b>filename</b> which can be used to initialize the PRNG by calling RAND_load_file() in a later session.</p> <p>RAND_file_name() generates a default path for the random seed file. <b>buf</b> points to a buffer of size <b>num</b> in which to store the filename.</p> <p>On all systems, if the environment variable <b>RANDFILE</b> is set, its value will be used as the seed filename. Otherwise, the file is called <code>.rnd</code>, found in platform dependent locations:</p> <dl> <dt id="On-Windows-in-order-of-preference">On Windows (in order of preference)</dt> <dd> <pre><code> %HOME%, %USERPROFILE%, %SYSTEMROOT%, C:\</code></pre> </dd> <dt id="On-VMS">On VMS</dt> <dd> <pre><code> SYS$LOGIN:</code></pre> </dd> <dt id="On-all-other-systems">On all other systems</dt> <dd> <pre><code> $HOME</code></pre> </dd> </dl> <p>If <code>$HOME</code> (on non-Windows and non-VMS system) is not set either, or <b>num</b> is too small for the pathname, an error occurs.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>RAND_load_file() returns the number of bytes read or -1 on error.</p> <p>RAND_write_file() returns the number of bytes written, or -1 if the bytes written were generated without appropriate seeding.</p> <p>RAND_file_name() returns a pointer to <b>buf</b> on success, and NULL on error.</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 2000-2020 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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