70 lines
2.2 KiB
PHP
70 lines
2.2 KiB
PHP
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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Random Number Generator
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*
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* PHP versions 4 and 5
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*
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* Here's a short example of how to use this library:
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* <code>
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* <?php
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* include('Crypt/Random.php');
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*
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* echo crypt_random();
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* ?>
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* </code>
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*
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* LICENSE: This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* @category Crypt
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* @package Crypt_Random
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright MMVII Jim Wigginton
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* @license http://www.gnu.org/licenses/lgpl.txt
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* @version $Id: Random.php,v 1.4 2008/05/21 05:15:32 terrafrost Exp $
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* @link http://phpseclib.sourceforge.net
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*/
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/**
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* Generate a random value. Feel free to replace this function with a cryptographically secure PRNG.
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*
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* @param optional Integer $min
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* @param optional Integer $max
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* @param optional String $randomness_path
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* @return Integer
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* @access public
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*/
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function crypt_random($min = 0, $max = 0x7FFFFFFF, $randomness_path = '/dev/urandom')
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{
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static $seeded = false;
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if (!$seeded) {
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$seeded = true;
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if (file_exists($randomness_path)) {
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$fp = fopen($randomness_path, 'r');
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$temp = unpack('Nint', fread($fp, 4));
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mt_srand($temp['int']);
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fclose($fp);
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} else {
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list($sec, $usec) = explode(' ', microtime());
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mt_srand((float) $sec + ((float) $usec * 100000));
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}
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}
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return mt_rand($min, $max);
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}
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?>
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