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Filename : Adler32.php
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<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Adler32 {

    function __construct() {
        
    }

    function getchecksum($MerchantId, $Amount, $OrderId, $URL, $WorkingKey) {
        $str = "$MerchantId|$OrderId|$Amount|$URL|$WorkingKey";
        $adler = 1;
        $adler = $this->adler32($adler, $str);
        return $adler;
    }

    function genchecksum($str) {
        $adler = 1;
        $adler = $this->adler32($adler, $str);
        return $adler;
    }

    function verifyChecksum($getCheck, $avnChecksum) {
        $verify = false;
        if ($getCheck == $avnChecksum)
            $verify = true;
        return $verify;
    }

    function adler32($adler, $str) {
        $BASE = 65521;
        $s1 = $adler & 0xffff;
        $s2 = ($adler >> 16) & 0xffff;
        for ($i = 0; $i < strlen($str); $i++) {
            $s1 = ($s1 + Ord($str[$i])) % $BASE;
            $s2 = ($s2 + $s1) % $BASE;
        }
        return $this->leftshift($s2, 16) + $s1;
    }

    function leftshift($str, $num) {

        $str = DecBin($str);

        for ($i = 0; $i < (64 - strlen($str)); $i++)
            $str = "0" . $str;

        for ($i = 0; $i < $num; $i++) {
            $str = $str . "0";
            $str = substr($str, 1);
        }
        return $this->cdec($str);
    }

    function cdec($num) {
        $dec = 0;
        for ($n = 0; $n < strlen($num); $n++) {
            $temp = $num[$n];
            $dec = $dec + $temp * pow(2, strlen($num) - $n - 1);
        }

        return $dec;
    }

}