<?php
class Travel_Model_TransactionResponse {

    private $respHashKey = "";
    private $responseEncryptionKey = "";
    private $salt = "";

    /**
     * @return string
     */
    public function getRespHashKey()
    {
        return $this->respHashKey;
    }
    
    public function setResponseEncypritonKey($key){
        $this->responseEncryptionKey = $key;
    }
    
    public function setSalt($saltEntered){
        $this->salt = $saltEntered;
    }

    /**
     * @param string $respHashKey
     */
    public function setRespHashKey($respHashKey)
    {
        $this->respHashKey = $respHashKey;
    }

    public function decryptResponseIntoArray($encdata){

        $atomenc = new Travel_Model_AtomAES();
        $decrypted = $atomenc->decrypt($encdata, $this->responseEncryptionKey, $this->salt);
        $array_response = explode('&', $decrypted); //change & to | for production
        $equalSplit = array();
        foreach ($array_response as $ar) {
            $equalSub = explode('=', $ar);
            if(!empty($equalSub[1]) && !empty($equalSub[0])){
                $temp = array(
                    $equalSub[0] => $equalSub[1],
                );
                $equalSplit += $temp;
            }
        }
        
        return $equalSplit;

    }

    public function decryptResponseInEasebuzz($encdata){

        $atomenc = new Travel_Model_AtomAES();
        $decrypted = $atomenc->decrypt($encdata, $this->responseEncryptionKey, $this->salt);        
        return $decrypted;

    }

    public function validateResponse($responseParams,$easeBuzz = NULL)
    {
        $str = $responseParams["mmp_txn"].$responseParams["mer_txn"].$responseParams["f_code"].$responseParams["prod"].$responseParams["discriminator"].$responseParams["amt"].$responseParams["bank_txn"];
        $signature =  hash_hmac("sha512",$str,$this->respHashKey,false);
        if($signature == $responseParams["signature"]){
            return true;
        } else {
            if(!empty($easeBuzz) && $easeBuzz == 'easebuzz' || $easeBuzz == 'CCAVENUE'){
                return true;
            }else{
                return false;
            }
        }

    }

    public function decrypt_cc($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;
    }

    public 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;
    }
}