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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_Bcmath 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_Bcmath implements Zend_Crypt_Math_BigInteger_Interface
{
/**
* Initialise a big integer into an extension specific type. This is not
* applicable to BCMath.
*
* @param string $operand
* @param int $base
* @return string
*/
public function init($operand, $base = 10)
{
return $operand;
}
/**
* Adds two arbitrary precision numbers
*
* @param string $left_operand
* @param string $right_operand
* @return string
*/
public function add($left_operand, $right_operand)
{
return bcadd($left_operand, $right_operand);
}
/**
* Subtract one arbitrary precision number from another
*
* @param string $left_operand
* @param string $right_operand
* @return string
*/
public function subtract($left_operand, $right_operand)
{
return bcsub($left_operand, $right_operand);
}
/**
* 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 string $left_operand
* @param string $right_operand
* @return int
*/
public function compare($left_operand, $right_operand)
{
return bccomp($left_operand, $right_operand);
}
/**
* Divide two big integers and return result or NULL if the denominator
* is zero.
*
* @param string $left_operand
* @param string $right_operand
* @return string|null
*/
public function divide($left_operand, $right_operand)
{
return bcdiv($left_operand, $right_operand);
}
/**
* Get modulus of an arbitrary precision number
*
* @param string $left_operand
* @param string $modulus
* @return string
*/
public function modulus($left_operand, $modulus)
{
return bcmod($left_operand, $modulus);
}
/**
* Multiply two arbitrary precision numbers
*
* @param string $left_operand
* @param string $right_operand
* @return string
*/
public function multiply($left_operand, $right_operand)
{
return bcmul($left_operand, $right_operand);
}
/**
* Raise an arbitrary precision number to another
*
* @param string $left_operand
* @param string $right_operand
* @return string
*/
public function pow($left_operand, $right_operand)
{
return bcpow($left_operand, $right_operand);
}
/**
* Raise an arbitrary precision number to another, reduced by a specified
* modulus
*
* @param string $left_operand
* @param string $right_operand
* @param string $modulus
* @return string
*/
public function powmod($left_operand, $right_operand, $modulus)
{
return bcpowmod($left_operand, $right_operand, $modulus);
}
/**
* Get the square root of an arbitrary precision number
*
* @param string $operand
* @return string
*/
public function sqrt($operand)
{
return bcsqrt($operand);
}
/**
* @param string $operand
* @return string
*/
public function binaryToInteger($operand)
{
$result = '0';
while (strlen($operand)) {
$ord = ord(substr($operand, 0, 1));
$result = bcadd(bcmul($result, 256), $ord);
$operand = substr($operand, 1);
}
return $result;
}
/**
* @param string $operand
* @return string
*/
public function integerToBinary($operand)
{
$cmp = bccomp($operand, 0);
$return = '';
if ($cmp == 0) {
return "\0";
}
while (bccomp($operand, 0) > 0) {
$return = chr(bcmod($operand, 256)) . $return;
$operand = bcdiv($operand, 256);
}
if (ord($return[0]) > 127) {
$return = "\0" . $return;
}
return $return;
}
/**public function integerToBinary($operand)
{
$return = '';
while(bccomp($operand, '0')) {
$return .= chr(bcmod($operand, '256'));
$operand = bcdiv($operand, '256');
}
return $return;
}**/ // Prior version for referenced offset
/**
* @param string $operand
* @return string
*/
public function hexToDecimal($operand)
{
$return = '0';
while(strlen($hex)) {
$hex = hexdec(substr($operand, 0, 4));
$dec = bcadd(bcmul($return, 65536), $hex);
$operand = substr($operand, 4);
}
return $return;
}
}
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