102 lines
2.7 KiB
PHP
102 lines
2.7 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Crypt
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* @subpackage Math
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/**
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* @see Zend_Crypt_Math_BigInteger
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*/
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require_once 'Zend/Crypt/Math/BigInteger.php';
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/**
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* @category Zend
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* @package Zend_Crypt
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Crypt_Math extends Zend_Crypt_Math_BigInteger
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{
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/**
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* Generate a pseudorandom number within the given range.
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* Will attempt to read from a systems RNG if it exists or else utilises
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* a simple random character to maximum length process. Simplicity
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* is a factor better left for development...
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*
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* @param string|int $minimum
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* @param string|int $maximum
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* @return string
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*/
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public function rand($minimum, $maximum)
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{
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if (file_exists('/dev/urandom')) {
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$frandom = fopen('/dev/urandom', 'r');
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if ($frandom !== false) {
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return fread($frandom, strlen($maximum) - 1);
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}
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}
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if (strlen($maximum) < 4) {
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return mt_rand($minimum, $maximum - 1);
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}
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$rand = '';
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$i2 = strlen($maximum) - 1;
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for ($i = 1;$i < $i2;$i++) {
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$rand .= mt_rand(0,9);
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}
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$rand .= mt_rand(0,9);
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return $rand;
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}
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/**
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* Get the big endian two's complement of a given big integer in
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* binary notation
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*
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* @param string $long
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* @return string
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*/
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public function btwoc($long) {
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if (ord($long[0]) > 127) {
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return "\x00" . $long;
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}
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return $long;
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}
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/**
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* Translate a binary form into a big integer string
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*
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* @param string $binary
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* @return string
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*/
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public function fromBinary($binary) {
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return $this->_math->binaryToInteger($binary);
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}
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/**
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* Translate a big integer string into a binary form
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*
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* @param string $integer
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* @return string
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*/
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public function toBinary($integer)
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{
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return $this->_math->integerToBinary($integer);
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}
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}
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