<?php
/**
* Cipher
*
* Simple mcrypt interface.
*
* Cipher is a simple class for working with mcrypt.
*
* @package Cipher
* @author Nathan Lucas <nathan@gimpstraw.com>
* @link http://www.gimpstraw.com/
* @copyright Copyright (c) 2008, Nathan Lucas
* @version 2.0.0
*
* Added $iv to both encrypt() and decrypt() allowing you to use preset IVs
* while encrypting/decrypting data.
*
* Also added getIV(), which returns the instance's current IV in base64
* allowing you to store this IV for use on other instances of Cipher.
*/
class Cipher {
/**
* Algorithm to use.
*
* @access private
* @var string
*/
private $algo;
/**
* Encryption mode.
*
* @access private
* @var string
*/
private $mode;
/**
* Randomization source.
*
* @access private
* @var integer
*/
private $source;
/**
* Initialization vector.
*
* @access private
* @var string
*/
private $iv = null;
/**
* Encryption key.
*
* @access private
* @var string
*/
private $key = null;
/**
* Cipher($algo, $mode, $source)
*
* Cipher constructor. Sets the algorithm being used, the encryption
* mode, and the IV.
*
* @param string $algo
* @param string $mode
* @param integer $source (randomization source)
* @access public
* @return void
*/
public function __construct($algo = MCRYPT_3DES, $mode = MCRYPT_MODE_CBC, $source = MCRYPT_RAND) {
$this->algo = $algo;
$this->mode = $mode;
$this->source = $source;
if (is_null($this->algo) || (strlen($this->algo) == 0)) {
$this->algo = MCRYPT_3DES;
}
if (is_null($this->mode) || (strlen($this->mode) == 0)) {
$this->mode = MCRYPT_MODE_CBC;
}
}
/**
* encrypt($data, $key, $iv)
*
* Returns encrpyted $data, base64 encoded. $key must be specified at
* least once, it can be changed at any point.
*
* @param string $data
* @param mixed $key
* @param string $iv
* @access public
* @return string
*/
public function encrypt($data, $key = null, $iv = null) {
$key = (strlen($key) == 0) ? $key = null : $key;
$this->setKey($key);
$this->setIV($iv);
$out = mcrypt_encrypt($this->algo, $this->key, $data, $this->mode, $this->iv);
return base64_encode($out);
}
/**
* decrypt($data, $key, $iv)
*
* Returns decrypted $data. $key must be specified at least once, it can
* be changed at any point.
*
* @param mixed $data
* @param mixed $key
* @param string $iv
* @access public
* @return string
*/
public function decrypt($data, $key = null, $iv = null) {
$key = (strlen($key) == 0) ? $key = null : $key;
$this->setKey($key);
$this->setIV($iv);
$data = base64_decode($data);
$out = mcrypt_decrypt($this->algo, $this->key, $data, $this->mode, $this->iv);
return trim($out);
}
/**
* getIV()
*
* Returns the IV used for encryption so you can use it again in another
* Cipher instance to decrypt data.
*
* @access public
* @return string
*/
public function getIV() {
return base64_encode($this->iv);
}
/**
* setIV($iv)
*
* Sets IV. If $iv is specified, the instance IV will be set to this. If not,
* the instance will generate an IV.
*
* @param string $iv
* @access private
* @return void
*/
private function setIV($iv) {
if (!is_null($iv)) {
$this->iv = base64_decode($iv);
}
if (is_null($this->iv)) {
$iv_size = mcrypt_get_iv_size($this->algo, $this->mode);
$this->iv = mcrypt_create_iv($iv_size, $this->source);
}
}
/**
* setKey($data, $key)
*
* Sets Cipher::key. This will be the key used for the encrypt and decrypt
* methods until another $key is specified. This will trigger an error if
* no initial key is set.
*
* @param mixed $key
* @access private
* @return void
*/
private function setKey($key) {
if (!is_null($key)) {
$key_size = mcrypt_get_key_size($this->algo, $this->mode);
$this->key = hash("sha256", $key, true);
$this->key = substr($this->key, 0, $key_size);
}
if (is_null($this->key)) {
trigger_error("You must specify a key at least once in either Cipher::encrpyt() or Cipher::decrypt().", E_USER_ERROR);
}
}
}
$cipher = new Cipher(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
$kunci = "%^$%^&%*HJGHJK";
$string="sembunyikan aku";
$en = $cipher->encrypt($string, $kunci);
$de = $cipher->decrypt($en, $kunci);
echo "Enkrispi Kata : $string \n";
echo "Hasil Enkripsi : $en \n";
echo "Hasil Dekrispi : $de \n";
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "MCRYPT_BLOWFISH" in /in/SshCb:190
Stack trace:
#0 {main}
thrown in /in/SshCb on line 190
Process exited with code 255.
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