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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_load_file</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <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> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/rand.h></pre> <pre> int RAND_load_file(const char *filename, long max_bytes);</pre> <pre> int RAND_write_file(const char *filename);</pre> <pre> const char *RAND_file_name(char *buf, size_t num);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p><code>RAND_load_file()</code> reads a number of bytes from file <strong>filename</strong> and adds them to the PRNG. If <strong>max_bytes</strong> is nonnegative, up to <strong>max_bytes</strong> are read; if <strong>max_bytes</strong> is -1, the complete file is read. Do not load the same file multiple times unless its contents have been updated by <code>RAND_write_file()</code> between reads. Also, note that <strong>filename</strong> should be adequately protected so that an attacker cannot replace or examine the contents. If <strong>filename</strong> 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><code>RAND_write_file()</code> writes a number of random bytes (currently 128) to file <strong>filename</strong> which can be used to initialize the PRNG by calling <code>RAND_load_file()</code> in a later session.</p> <p><code>RAND_file_name()</code> generates a default path for the random seed file. <strong>buf</strong> points to a buffer of size <strong>num</strong> in which to store the filename.</p> <p>On all systems, if the environment variable <strong>RANDFILE</strong> 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><strong><a name="windows" class="item">On Windows (in order of preference)</a></strong></dt> <dd> <pre> %HOME%, %USERPROFILE%, %SYSTEMROOT%, C:\</pre> </dd> <dt><strong><a name="on_vms" class="item">On VMS</a></strong></dt> <dd> <pre> SYS$LOGIN:</pre> </dd> <dt><strong><a name="on_all_other_systems" class="item">On all other systems</a></strong></dt> <dd> <pre> $HOME</pre> </dd> </dl> <p>If <code>$HOME</code> (on non-Windows and non-VMS system) is not set either, or <strong>num</strong> is too small for the pathname, an error occurs.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p><code>RAND_load_file()</code> returns the number of bytes read or -1 on error.</p> <p><code>RAND_write_file()</code> returns the number of bytes written, or -1 if the bytes written were generated without appropriate seeding.</p> <p><code>RAND_file_name()</code> returns a pointer to <strong>buf</strong> on success, and NULL on error.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>RAND_add(3)</em>, <em>RAND_bytes(3)</em>, <em>RAND(7)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></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>