<?php

/***************************************************************
 * Catabatic Technology Pvt. Ltd.
 * File Name : Menu.php
 * File Description : Menu Model for managed all menus
 * Created By : Prashant Kumar
 * Created Date: 18-September-2014
 ***************************************************************/

class Travel_Model_Encrytion extends Zend_Db_Table_Abstract
{
    protected $key;
    protected $data;
    protected $method;
    protected $iv;

    /**
     * Available OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING
     *
     * @var type $options
     */
    protected $options = 0;

    /**
     * 
     * @param type $data
     * @param type $key
     * @param type $iv
     * @param type $blockSize
     * @param type $mode
     */
    public function __construct($data = null, $key = null, $iv = null, $blockSize = 256, $mode = 'CBC')
    {
        $this->setData($data);
        $this->setKey($key);
        $this->setInitializationVector($iv);
        $this->setMethod($blockSize, $mode);
    }

    /**
     * 
     * @param type $data
     */
    public function setData($data)
    {
        $this->data = $data;
    }

    /**
     * 
     * @param type $key
     */
    public function setKey($key)
    {
        $this->key = $key;
    }

    /**
     * CBC 128 192 256 
              CBC-HMAC-SHA1 128 256
              CBC-HMAC-SHA256 128 256
              CFB 128 192 256
              CFB1 128 192 256
              CFB8 128 192 256
              CTR 128 192 256
              ECB 128 192 256
              OFB 128 192 256
              XTS 128 256
     * @param type $blockSize
     * @param type $mode
     */
    public function setMethod($blockSize, $mode = 'CBC')
    {
        if ($blockSize == 192 && in_array('', array('CBC-HMAC-SHA1', 'CBC-HMAC-SHA256', 'XTS'))) {
            $this->method = null;
            throw new Exception('Invalid block size and mode combination!');
        }
        $this->method = 'AES-' . $blockSize . '-' . $mode;
    }

    /**
     * 
     * @param type $data
     */
    public function setInitializationVector($iv)
    {
        $this->iv = $iv;
    }

    /**
     * 
     * @return boolean
     */
    public function validateParams()
    {
        if (
            $this->data != null &&
            $this->method != null
        ) {
            return true;
        } else {
            return FALSE;
        }
    }

    //it must be the same when you encrypt and decrypt
    protected function getIV()
    {
        return $this->iv;
    }

    /**
     * @return type
     * @throws Exception
     */
    public function encrypt()
    {
        if ($this->validateParams()) {
            return trim(openssl_encrypt($this->data, $this->method, $this->key, $this->options, $this->getIV()));
        } else {
            throw new Exception('Invalid params!');
        }
    }

    /**
     * 
     * @return type
     * @throws Exception
     */
    public function decrypt()
    {
        if ($this->validateParams()) {
            $ret = openssl_decrypt($this->data, $this->method, $this->key, $this->options, $this->getIV());
			return   trim($ret);
        } else {
            throw new Exception('Invalid params!');
        }
    }
}