Gmp.php

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<?php
#require_once 'Zend/Crypt/Math/BigInteger/Interface.php';

class Zend_Crypt_Math_BigInteger_Gmp implements Zend_Crypt_Math_BigInteger_Interface
{

    public function init($operand, $base = 10)
    {
        return $operand;
    }

    public function add($left_operand, $right_operand)
    {
        $result = gmp_add($left_operand, $right_operand);
        return gmp_strval($result);
    }

    public function subtract($left_operand, $right_operand)
    {
        $result = gmp_sub($left_operand, $right_operand);
        return gmp_strval($result);
    }

    public function compare($left_operand, $right_operand)
    {
        $result = gmp_cmp($left_operand, $right_operand);
        return gmp_strval($result);
    }

    public function divide($left_operand, $right_operand)
    {
        $result = gmp_div($left_operand, $right_operand);
        return gmp_strval($result);
    }

    public function modulus($left_operand, $modulus)
    {
        $result = gmp_mod($left_operand, $modulus);
        return gmp_strval($result);
    }

    public function multiply($left_operand, $right_operand)
    {
        $result = gmp_mul($left_operand, $right_operand);
        return gmp_strval($result);
    }

    public function pow($left_operand, $right_operand)
    {
        $result = gmp_pow($left_operand, $right_operand);
        return gmp_strval($result);
    }

    public function powmod($left_operand, $right_operand, $modulus)
    {
        $result = gmp_powm($left_operand, $right_operand, $modulus);
        return gmp_strval($result);
    }

    public function sqrt($operand)
    {
        $result = gmp_sqrt($operand);
        return gmp_strval($result);
    }

    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);
    }

    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;
    }

    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;
    }

}