/**
     * CCAvenue Encrypt Function
     *
     * @param $plainText
     * @param $key
     * @return string
     */
    protected function encrypt($plainText,$key)
    {
        $secretKey = $this->hextobin(md5($key));
        $initVector = pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
        $openMode = @mcrypt_module_open(MCRYPT_RIJNDAEL_128, '','cbc', '');
        $blockSize = @mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, 'cbc');
        $plainPad = $this->pkcs5_pad($plainText, $blockSize);
        if (@mcrypt_generic_init($openMode, $secretKey, $initVector) != -1)
        {
            $encryptedText = @mcrypt_generic($openMode, $plainPad);
            @mcrypt_generic_deinit($openMode);
        }
        return bin2hex($encryptedText);
    }
    /**
     * CCAvenue Decrypt Function
     *
     * @param $encryptedText
     * @param $key
     * @return string
     */
    protected function decrypt($encryptedText,$key)
    {
        $secretKey = $this->hextobin(md5($key));
        $initVector = pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
        $encryptedText=$this->hextobin($encryptedText);
        $openMode = @mcrypt_module_open(MCRYPT_RIJNDAEL_128, '','cbc', '');
        @mcrypt_generic_init($openMode, $secretKey, $initVector);
        $decryptedText = @mdecrypt_generic($openMode, $encryptedText);
        $decryptedText = rtrim($decryptedText, "\0");
        @mcrypt_generic_deinit($openMode);
        return $decryptedText;
    }

    /**
     * Function to encrypt
     * @param $plainText string
     * @param $key string
     * @return string
     */
    public function encrypt($plainText, $key){
        $key = $this->hextobin(md5($key));
        $initVector = pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
        $openMode = openssl_encrypt($plainText, 'AES-128-CBC', $key, OPENSSL_RAW_DATA, $initVector);
        $encryptedText = bin2hex($openMode);
        return $encryptedText;
   }

    /**
     * Function to decrypt
     * @param $encryptedText string
     * @param $key
     * @return string
     */
    public function decrypt($encryptedText, $key){
        $key = $this->hextobin(md5($key));
        $initVector = pack("C*", 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f);
        $encryptedText = $this->hextobin($encryptedText);
        $decryptedText = openssl_decrypt($encryptedText, 'AES-128-CBC', $key, OPENSSL_RAW_DATA, $initVector);
        return $decryptedText;
    }