<?php
namespace Helpers;

class MCrypt
{	
	private $config;
	private $code;
	private $salt;
	
	function __construct()
	{
		$this->config = \Zend_Registry::get('config');
		$this->code = isset($this->config->auth->mcryptcode) ? $this->config->auth->mcryptcode : "SJY001";
		$this->salt = '!kQm*fF3pXe1Kbm%9';
	}
	
	//invoke encrypt
	public function encode()
	{
		
	}
	
	//invoke decrypt
	public function decode()
	{
		
	}
	
	public function encrypt($decrypted) {
		
		$key = hash('SHA256', $this->salt.$this->code , true);
		
		srand();
		
		$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND);
		
		if (strlen($iv_base64 = rtrim(base64_encode($iv), '=')) != 22) return false;

		$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $decrypted . md5($decrypted), MCRYPT_MODE_CBC, $iv));

		return $iv_base64 . $encrypted;
	}
	
	public function decrypt($encrypted) {
		
		$key = hash('SHA256', $this->salt.$this->code , true);
		
		$iv = base64_decode(substr($encrypted, 0, 22) . '==');
		
		$encrypted = substr($encrypted, 22);

		$decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($encrypted), MCRYPT_MODE_CBC, $iv), "\0\4");
	
		$hash = substr($decrypted, -32);

		$decrypted = substr($decrypted, 0, -32);

		if (md5($decrypted) != $hash) return false;

		return $decrypted;
	}
	
	
}