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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_Interface
*/
/**
* Support for arbitrary precision mathematics in PHP.
*
* Zend_Crypt_Math_BigInteger_Gmp is a wrapper across the PHP BCMath
* extension.
*
* @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_BigInteger_Gmp implements Zend_Crypt_Math_BigInteger_Interface
{
/**
* Initialise a big integer into an extension specific type.
* @param string $operand
* @param int $base
* @return string
*/
public function init($operand, $base = 10)
{
return $operand;
}
/**
* Adds two arbitrary precision numbers
*
* @param resource $left_operand
* @param resource $right_operand
* @return string
*/
public function add($left_operand, $right_operand)
{
$result = gmp_add($left_operand, $right_operand);
return gmp_strval($result);
}
/**
* Subtract numbers
*
* @param resource $left_operand
* @param resource $right_operand
* @return string
*/
public function subtract($left_operand, $right_operand)
{
$result = gmp_sub($left_operand, $right_operand);
return gmp_strval($result);
}
/**
* Compare two big integers and returns result as an integer where 0 means
* both are identical, 1 that left_operand is larger, or -1 that
* right_operand is larger.
*
* @param resource $left_operand
* @param resource $right_operand
* @return int
*/
public function compare($left_operand, $right_operand)
{
$result = gmp_cmp($left_operand, $right_operand);
return gmp_strval($result);
}
/**
* Divide two big integers and return result or NULL if the denominator
* is zero.
*
* @param resource $left_operand
* @param resource $right_operand
* @return string|null
*/
public function divide($left_operand, $right_operand)
{
$result = gmp_div($left_operand, $right_operand);
return gmp_strval($result);
}
/**
* Modulo operation
*
* @param resource $left_operand
* @param resource $modulus
* @internal param string $right_operand
* @return string
*/
public function modulus($left_operand, $modulus)
{
$result = gmp_mod($left_operand, $modulus);
return gmp_strval($result);
}
/**
* Multiply numbers
*
* @param resource $left_operand
* @param resource $right_operand
* @return string
*/
public function multiply($left_operand, $right_operand)
{
$result = gmp_mul($left_operand, $right_operand);
return gmp_strval($result);
}
/**
* Raise number into power
*
* @param resource $left_operand
* @param int $right_operand
* @return string
*/
public function pow($left_operand, $right_operand)
{
$result = gmp_pow($left_operand, $right_operand);
return gmp_strval($result);
}
/**
* Raise number into power with modulo
*
* @param resource $left_operand
* @param resource $right_operand
* @param resource $modulus
* @return string
*/
public function powmod($left_operand, $right_operand, $modulus)
{
$result = gmp_powm($left_operand, $right_operand, $modulus);
return gmp_strval($result);
}
/**
* Calculate square root
*
* @param $operand
* @return string
*/
public function sqrt($operand)
{
$result = gmp_sqrt($operand);
return gmp_strval($result);
}
/**
* @param string $operand
* @return string
*/
public function binaryToInteger($operand)
{
$result = '0';
while (strlen($operand)) {
$ord = ord(substr($operand, 0, 1));
$result = gmp_add(gmp_mul($result, 256), $ord);
$operand = substr($operand, 1);
}
return gmp_strval($result);
}
/**
* @param resource $operand GMP number resource
* @return string
*/
public function integerToBinary($operand)
{
$bigInt = gmp_strval($operand, 16);
if (strlen($bigInt) % 2 != 0) {
$bigInt = '0' . $bigInt;
} else if ($bigInt[0] > '7') {
$bigInt = '00' . $bigInt;
}
$return = pack("H*", $bigInt);
return $return;
}
/**
* @param string $operand
* @return string
*/
public function hexToDecimal($operand)
{
$return = '0';
while(strlen($hex)) {
$hex = hexdec(substr($operand, 0, 4));
$dec = gmp_add(gmp_mul($return, 65536), $hex);
$operand = substr($operand, 4);
}
return $return;
}
}
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