<?php

class Crypt {
    private $key = NULL;
    private $iv = NULL;
    private $iv_size = NULL;
    private $iterations = 999;

	public function Crypt($key = '') {
		$this->init($key);
	}

	public function init($key = "") {
		$this->key = ($key != "") ? $key : "";
		
		$this->algorithm = MCRYPT_DES;
		$this->mode = MCRYPT_MODE_ECB;
		
		$this->iv_size = mcrypt_get_iv_size($this->algorithm, $this->mode);
		$this->iv = mcrypt_create_iv($this->iv_size, MCRYPT_RAND);
	}

	public function encrypt($data) {
		$size = mcrypt_get_block_size($this->algorithm, $this->mode);
		$data = $this->pkcs5_pad($data, $size);
		return base64_encode(mcrypt_encrypt($this->algorithm, $this->key, $data, $this->mode, $this->iv));
	}

	public function decrypt($data) {
		return $this->pkcs5_unpad(rtrim(mcrypt_decrypt($this->algorithm, $this->key, base64_decode($data), $this->mode, $this->iv)));
	}

    public function encryptV2($plainText) {
        $key = hash_pbkdf2("sha256", $this->key, '', $this->iterations, 64);
        $encryptedData = openssl_encrypt($plainText, 'AES-256-CBC', hex2bin($key), OPENSSL_RAW_DATA);
        return base64_encode($encryptedData);
    }

    public function decryptV2($encryptedTextBase64) {
        $encryptedText = base64_decode($encryptedTextBase64);
        $key = hash_pbkdf2("sha256", $this->key, '', $this->iterations, 64);
        $decryptedText = openssl_decrypt($encryptedText, 'AES-256-CBC', hex2bin($key), OPENSSL_RAW_DATA);
        return $decryptedText;
    }

	private function pkcs5_pad($text, $blocksize) {
		$pad = $blocksize - (strlen($text) % $blocksize);
		return $text . str_repeat(chr($pad), $pad);
	}

	private function pkcs5_unpad($text) {
		$pad = ord($text{strlen($text) - 1});
		if ($pad > strlen($text))
			return false;
		if (strspn($text, chr($pad), strlen($text) - $pad) != $pad)
			return false;
		return substr($text, 0, -1 * $pad);
	}
}