src/Biz/Util/Phpsec/Crypt/Random.php

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<?php

/**
 * Random Number Generator.
 *
 * PHP version 5
 *
 * Here's a short example of how to use this library:
 * <code>
 * <?php
 *    include 'vendor/autoload.php';
 *
 *    echo bin2hex(\Biz\Util\Phpsec\Crypt\Random::string(8));
 * ?>
 * </code>
 *
 * @category  Crypt
 *
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 *
 * @see      http://phpseclib.sourceforge.net
 */

namespace Biz\Util\Phpsec\Crypt;

/**
 * Pure-PHP Random Number Generator.
 *
 *
 * @author  Jim Wigginton <terrafrost@php.net>
 */
class Random
{
    /**
     * Generate a random string.
     *
     * Although microoptimizations are generally discouraged as they impair readability this function is ripe with
     * microoptimizations because this function has the potential of being called a huge number of times.
     * eg. for RSA key generation.
     *
     * @param int $length
     *
     * @return string
     */
    public static function string($length)
    {
        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
            // method 1. prior to PHP 5.3 this would call rand() on windows hence the function_exists('class_alias') call.
            // ie. class_alias is a function that was introduced in PHP 5.3

            if (function_exists('mcrypt_create_iv') && function_exists('class_alias')) {
                return mcrypt_create_iv($length);
            }

            // method 2. openssl_random_pseudo_bytes was introduced in PHP 5.3.0 but prior to PHP 5.3.4 there was,
            // to quote <http://php.net/ChangeLog-5.php#5.3.4>, "possible blocking behavior". as of 5.3.4
            // openssl_random_pseudo_bytes and mcrypt_create_iv do the exact same thing on Windows. ie. they both
            // call php_win32_get_random_bytes():