<?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

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

 */

/**

 * @see Zend_Crypt_Math_BigInteger

 */

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

/**

 * @category   Zend

 * @package    Zend_Crypt

 * @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);

    }

}