class.ilPasswordUtils.php

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<?php
/* Copyright (c) 1998-2014 ILIAS open source, Extended GPL, see docs/LICENSE */
 
class ilPasswordUtils
{
        public static function getBytes($length)
        {
                if(!defined('PHP_WINDOWS_VERSION_BUILD') && extension_loaded('openssl'))
                {
                        $secure = null;
                        $rand   = openssl_random_pseudo_bytes($length, $secure);
                        if(false !== $rand && $secure === true)
                        {
                                return $rand;
                        }
                }
 
                if(extension_loaded('mcrypt'))
                {
                        // PHP bug #55169
                        // @see https://bugs.php.net/bug.php?id=55169
                        if(
                                strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN' ||
                                version_compare(PHP_VERSION, '5.3.7') >= 0
                        )
                        {
                                $rand = mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
                                if($rand !== false && strlen($rand) === $length)
                                {
                                        return $rand;
                                }
                        }
                }
 
                // Default random string generation
                $rand = '';
                for($i = 0; $i < $length; $i++)
                {
                        $rand .= chr(mt_rand(0, 255));
                }
                return $rand;
        }
}