Bcmath.php

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

class Zend_Crypt_Math_BigInteger_Bcmath implements Zend_Crypt_Math_BigInteger_Interface
{

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

    public function add($left_operand, $right_operand)
    {
        return bcadd($left_operand, $right_operand);
    }

    public function subtract($left_operand, $right_operand)
    {
        return bcsub($left_operand, $right_operand);
    }

    public function compare($left_operand, $right_operand)
    {
        return bccomp($left_operand, $right_operand);
    }

    public function divide($left_operand, $right_operand)
    {
        return bcdiv($left_operand, $right_operand);
    }

    public function modulus($left_operand, $modulus)
    {
        return bcmod($left_operand, $modulus);
    }

    public function multiply($left_operand, $right_operand)
    {
        return bcmul($left_operand, $right_operand);
    }

    public function pow($left_operand, $right_operand)
    {
        return bcpow($left_operand, $right_operand);
    }

    public function powmod($left_operand, $right_operand, $modulus)
    {
        return bcpowmod($left_operand, $right_operand, $modulus);
    }

    public function sqrt($operand)
    {
        return bcsqrt($operand);
    }

    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;
    }

    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;
    }
 // Prior version for referenced offset

    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;
    }
}