Файл: library/Zend/Crypt/Math.php
Строк: 148
<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Crypt
* @subpackage Math
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Math.php 20096 2010-01-06 02:05:09Z bkarwin $
*/
/**
* @see Zend_Crypt_Math_BigInteger
*/
require_once 'Zend/Crypt/Math/BigInteger.php';
/**
* @category Zend
* @package Zend_Crypt
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Crypt_Math extends Zend_Crypt_Math_BigInteger
{
/**
* Generate a pseudorandom number within the given range.
* Will attempt to read from a systems RNG if it exists or else utilises
* a simple random character to maximum length process. Simplicity
* is a factor better left for development...
*
* @param string|int $minimum
* @param string|int $maximum
* @return string
*/
public function rand($minimum, $maximum)
{
if (file_exists('/dev/urandom')) {
$frandom = fopen('/dev/urandom', 'r');
if ($frandom !== false) {
return fread($frandom, strlen($maximum) - 1);
}
}
if (strlen($maximum) < 4) {
return mt_rand($minimum, $maximum - 1);
}
$rand = '';
$i2 = strlen($maximum) - 1;
for ($i = 1;$i < $i2;$i++) {
$rand .= mt_rand(0,9);
}
$rand .= mt_rand(0,9);
return $rand;
}
/**
* Get the big endian two's complement of a given big integer in
* binary notation
*
* @param string $long
* @return string
*/
public function btwoc($long) {
if (ord($long[0]) > 127) {
return "x00" . $long;
}
return $long;
}
/**
* Translate a binary form into a big integer string
*
* @param string $binary
* @return string
*/
public function fromBinary($binary) {
return $this->_math->binaryToInteger($binary);
}
/**
* Translate a big integer string into a binary form
*
* @param string $integer
* @return string
*/
public function toBinary($integer)
{
return $this->_math->integerToBinary($integer);
}
}