*
* @author Roland Haeder <webmaster@ship-simu.org>
* @version 0.0.0
- * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 Core Developer Team
+ * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2011 Core Developer Team
* @license GNU GPL 3.0 or any newer version
* @link http://www.ship-simu.org
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-class McryptStream extends BaseStream {
+class McryptStream extends BaseStream implements EncryptableStream {
+ /**
+ * Seperator on many places
+ */
+ const DATA_PAYLOAD_SEPERATOR = '|';
+
/**
* Protected constructor
*
/**
* Creates an instance of this node class
*
+ * @param $rngInstance An RNG instance
* @return $streamInstance An instance of this node class
*/
- public final static function createMcryptStream () {
+ public static final function createMcryptStream (RandomNumberGenerator $rngInstance) {
// Get a new instance
$streamInstance = new McryptStream();
+ // Set the RNG instance
+ $streamInstance->setRngInstance($rngInstance);
+
// Return the instance
return $streamInstance;
}
+
+ /**
+ * Encrypt the string with fixed salt
+ *
+ * @param $str The unencrypted string
+ * @param $key Optional key, if none provided, a random key will be generated
+ * @return $encrypted Encrypted string
+ */
+ public function encryptStream ($str, $key = null) {
+ // Init crypto module
+ $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
+ $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
+
+ // Generate key, if none provided
+ if (is_null($key)) {
+ // None provided
+ $key = $this->getRngInstance()->generateKey();
+ } // END - if
+
+ // Add some "payload" to the string
+ switch ($this->getRngInstance()->randomNumber(0, 8)) {
+ case 0:
+ $payloadString = crc32($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . crc32($this->getRngInstance()->randomString(20));
+ break;
+
+ case 1:
+ $payloadString = crc32($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . md5($this->getRngInstance()->randomString(20));
+ break;
+
+ case 2:
+ $payloadString = crc32($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . sha1($this->getRngInstance()->randomString(20));
+ break;
+
+ case 3:
+ $payloadString = md5($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . crc32($this->getRngInstance()->randomString(20));
+ break;
+
+ case 4:
+ $payloadString = md5($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . md5($this->getRngInstance()->randomString(20));
+ break;
+
+ case 5:
+ $payloadString = md5($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . sha1($this->getRngInstance()->randomString(20));
+ break;
+
+ case 6:
+ $payloadString = sha1($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . crc32($this->getRngInstance()->randomString(20));
+ break;
+
+ case 7:
+ $payloadString = sha1($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . md5($this->getRngInstance()->randomString(20));
+ break;
+
+ case 8:
+ $payloadString = sha1($this->getRngInstance()->randomString(10)) . self::DATA_PAYLOAD_SEPERATOR . base64_encode($str) . self::DATA_PAYLOAD_SEPERATOR . sha1($this->getRngInstance()->randomString(20));
+ break;
+ }
+
+ // Encrypt the string
+ $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $payloadString, MCRYPT_MODE_ECB, $iv);
+
+ // Return the string
+ return $encrypted;
+ }
+
+ /**
+ * Decrypt the string with fixed salt
+ *
+ * @param $encrypted Encrypted string
+ * @param $key Optional key, if none provided, a random key will be generated
+ * @return $str The unencrypted string
+ */
+ public function decryptStream ($encrypted, $key = null) {
+ // Init crypto module
+ $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
+ $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
+
+ // Shall we use a default key or custom?
+ if (is_null($key)) {
+ // Generate (default) key
+ $key = $this->getRngInstance()->generateKey();
+ } // END - if
+
+ // Decrypt the string
+ $payloadString = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $encrypted, MCRYPT_MODE_ECB, $iv);
+
+ // Get the real string out
+ $strArray = explode(self::DATA_PAYLOAD_SEPERATOR, $payloadString);
+
+ // Does the element count match?
+ assert(count($strArray) == 3);
+
+ // Decode the string
+ $str = base64_decode($strArray[1]);
+
+ // Trim trailing nulls away
+ $str = rtrim($str, "\0");
+
+ // Return the string
+ return $str;
+ }
+
+ /**
+ * Streams the data and maybe does something to it
+ *
+ * @param $data The data (string mostly) to "stream"
+ * @return $data The data (string mostly) to "stream"
+ * @throws UnsupportedOperationException If this method is called (which is a mistake)
+ */
+ public function streamData ($data) {
+ $this->debugOutput('Unhandled ' . strlen($data) . ' bytes in this stream.');
+ throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
+ }
}
// [EOF]
projects / core.git / blobdiff