Cipher.php

   1 <?php
   2
   3   /*
   4    * Some AES encryption. Works in PHP 4 or 5.
   5    * Scrounged on the web, and made to work.
   6    */
   7
   8 class Cipher {
   9   var $securekey, $iv;
  10   var $enc, $mode;
  11
  12   function Cipher($textkey) {
  13     $this->enc = MCRYPT_RIJNDAEL_128;
  14     $this->mode = MCRYPT_MODE_ECB;
  15     $this->securekey = mhash(MHASH_SHA256,$textkey);
  16     $iv_size = mcrypt_get_iv_size($this->enc, $this->mode);
  17     $this->iv = mcrypt_create_iv($iv_size, MCRYPT_DEV_RANDOM);
  18   }
  19
  20   function encrypt($input) {
  21     return mcrypt_encrypt($this->enc, $this->securekey, $input, $this->mode, $this->iv);
  22   }
  23
  24   function decrypt($input) {
  25     return trim(mcrypt_decrypt($this->enc, $this->securekey, $input, $this->mode, $this->iv));
  26   }
  27
  28   function encrypt2hex($input) {
  29     return bin2hex($this->encrypt($input));
  30   }
  31
  32   function decrypthex($input) {
  33     return $this->decrypt(pack("H*", $input));
  34   }
  35 }
  36
  37 /* test code
  38 $cipher = new Cipher('secret passphrase');
  39
  40 $encryptedtext = $cipher->encrypt2hex(pack("H*", "1650f617c024d6441461b2538c6d9540"));
  41 echo "->encrypt = $encryptedtext<br />";
  42
  43 $decryptedtext = bin2hex($cipher->decrypthex($encryptedtext));
  44 echo "->decrypt = $decryptedtext<br />";
  45
  46 var_dump($cipher);
  47 */
  48 ?>