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<?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";