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 <?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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Crypt_Math_BigInteger
  */
 // require_once 'Zend/Crypt/Math/BigInteger.php';
 
 /**
  * @category   Zend
  * @package    Zend_Crypt
  * @copyright  Copyright (c) 2005-2015 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;
     }
 
     /**
      * Return a random strings of $length bytes
      *
      * @param  integer $length
      * @param  boolean $strong
      * @return string
      */
     public static function randBytes($length, $strong = false)
     {
         $length = (int) $length;
         if ($length <= 0) {
             return false;
         }
         if (function_exists('random_bytes')) { // available in PHP 7
             return random_bytes($length);
         }
         if (function_exists('mcrypt_create_iv')) {
             $bytes = mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
             if ($bytes !== false && strlen($bytes) === $length) {
                 return $bytes;
             }
         }
         if (file_exists('/dev/urandom') && is_readable('/dev/urandom')) {
             $frandom = fopen('/dev/urandom', 'r');
             if ($frandom !== false) {
                 return fread($frandom, $length);
             }
         }
         if (true === $strong) {
             // require_once 'Zend/Crypt/Exception.php';
             throw new Zend_Crypt_Exception(
                 'This PHP environment doesn\'t support secure random number generation. ' .
                 'Please consider installing the OpenSSL and/or Mcrypt extensions'
             );
         }
         $rand = '';
         for ($i = 0; $i < $length; $i++) {
             $rand .= chr(mt_rand(0, 255));
         }
         return $rand;
     }
 
     /**
      * Return a random integer between $min and $max
      *
      * @param  integer $min
      * @param  integer $max
      * @param  boolean $strong
      * @return integer
      */
     public static function randInteger($min, $max, $strong = false)
     {
         if ($min > $max) {
             // require_once 'Zend/Crypt/Exception.php';
             throw new Zend_Crypt_Exception(
                 'The min parameter must be lower than max parameter'
             );
         }
         $range = $max - $min;
         if ($range == 0) {
             return $max;
         } elseif ($range > PHP_INT_MAX || is_float($range)) {
             // require_once 'Zend/Crypt/Exception.php';
             throw new Zend_Crypt_Exception(
                 'The supplied range is too great to generate'
             );
         }
         if (function_exists('random_int')) { // available in PHP 7
             return random_int($min, $max);
         }
         // calculate number of bits required to store range on this machine
         $r = $range;
         $bits = 0;
         while ($r) {
             $bits++;
             $r >>= 1;
         }
         $bits   = (int) max($bits, 1);
         $bytes  = (int) max(ceil($bits / 8), 1);
         $filter = (int) ((1 << $bits) - 1);
         do {
             $rnd  = hexdec(bin2hex(self::randBytes($bytes, $strong)));
             $rnd &= $filter;
         } while ($rnd > $range);
         return ($min + $rnd);
     }
 
     /**
      * 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);
     }
 }