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Filename : common.php
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<?php
function encrypt_ccavenue($plainText,$key)
{
    $secretKey = hextobin(md5($key));
    $initVector = pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
    $encryptedText = openssl_encrypt($plainText, "AES-128-CBC", $secretKey, OPENSSL_RAW_DATA, $initVector);
    $encryptedText = bin2hex($encryptedText);
    return $encryptedText;
}

function decrypt_ccavenue($encryptedText,$key)
{
    $secretKey         = hextobin(md5($key));
    $initVector         =  pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
    $encryptedText      = hextobin($encryptedText);
    $decryptedText         =  openssl_decrypt($encryptedText,"AES-128-CBC", $secretKey, OPENSSL_RAW_DATA, $initVector);
    return $decryptedText;
}
//*********** Padding Function *********************

    function pkcs5_pad ($plainText, $blockSize)
{
    $pad = $blockSize - (strlen($plainText) % $blockSize);
    return $plainText . str_repeat(chr($pad), $pad);
}

//********** Hexadecimal to Binary function for php 4.0 version ********

function hextobin($hexString) 
{ 
    $length = strlen($hexString); 
    $binString="";   
    $count=0; 
    while($count<$length) 
    {       
        $subString =substr($hexString,$count,2);           
        $packedString = pack("H*",$subString); 
        if ($count==0)
    {
        $binString=$packedString;
    } 
        
    else 
    {
        $binString.=$packedString;
    } 
        
    $count+=2; 
    } 
    return $binString; 
}