1 <?php

     2 /**

     3  * Zend Framework

     4  *

     5  * LICENSE

     6  *

     7  * This source file is subject to the new BSD license that is bundled

     8  * with this package in the file LICENSE.txt.

     9  * It is also available through the world-wide-web at this URL:

    10  * http://framework.zend.com/license/new-bsd

    11  * If you did not receive a copy of the license and are unable to

    12  * obtain it through the world-wide-web, please send an email

    13  * to license@zend.com so we can send you a copy immediately.

    14  *

    15  * @category   Zend

    16  * @package    Zend_Crypt

    17  * @subpackage Math

    18  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    19  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    20  * @version    $Id: Math.php 20096 2010-01-06 02:05:09Z bkarwin $

    21  */

    22 

    23 /**

    24  * @see Zend_Crypt_Math_BigInteger

    25  */

    26 require_once 'Zend/Crypt/Math/BigInteger.php';

    27 

    28 /**

    29  * @category   Zend

    30  * @package    Zend_Crypt

    31  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    32  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    33  */

    34 class Zend_Crypt_Math extends Zend_Crypt_Math_BigInteger

    35 {

    36 

    37     /**

    38      * Generate a pseudorandom number within the given range.

    39      * Will attempt to read from a systems RNG if it exists or else utilises

    40      * a simple random character to maximum length process. Simplicity

    41      * is a factor better left for development...

    42      *

    43      * @param string|int $minimum

    44      * @param string|int $maximum

    45      * @return string

    46      */

    47     public function rand($minimum, $maximum)

    48     {

    49         if (file_exists('/dev/urandom')) {

    50             $frandom = fopen('/dev/urandom', 'r');

    51             if ($frandom !== false) {

    52                 return fread($frandom, strlen($maximum) - 1);

    53             }

    54         }

    55         if (strlen($maximum) < 4) {

    56             return mt_rand($minimum, $maximum - 1);

    57         }

    58         $rand = '';

    59         $i2 = strlen($maximum) - 1;

    60         for ($i = 1;$i < $i2;$i++) {

    61             $rand .= mt_rand(0,9);

    62         }

    63         $rand .= mt_rand(0,9);

    64         return $rand;

    65     }

    66 

    67     /**

    68      * Get the big endian two's complement of a given big integer in

    69      * binary notation

    70      *

    71      * @param string $long

    72      * @return string

    73      */

    74     public function btwoc($long) {

    75         if (ord($long[0]) > 127) {

    76             return "\x00" . $long;

    77         }

    78         return $long;

    79     }

    80 

    81     /**

    82      * Translate a binary form into a big integer string

    83      *

    84      * @param string $binary

    85      * @return string

    86      */

    87     public function fromBinary($binary) {

    88         return $this->_math->binaryToInteger($binary);

    89     }

    90 

    91     /**

    92      * Translate a big integer string into a binary form

    93      *

    94      * @param string $integer

    95      * @return string

    96      */

    97     public function toBinary($integer)

    98     {

    99         return $this->_math->integerToBinary($integer);

   100     }

   101 

   102 }