include/crypt.php

   1 <?php
   2         function decrypt_string($str) {
   3                 $pair = explode(":", $str);
   4
   5                 if (count($pair) == 2) {
   6                         @$iv = base64_decode($pair[0]);
   7                         @$encstr = base64_decode($pair[1]);
   8
   9                         if ($iv && $encstr) {
  10                                 $key = hash('SHA256', FEED_CRYPT_KEY, true);
  11
  12                                 $str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encstr,
  13                                         MCRYPT_MODE_CBC, $iv);
  14
  15                                 if ($str) return rtrim($str);
  16                         }
  17                 }
  18
  19                 return false;
  20         }
  21
  22         function encrypt_string($str) {
  23                 $key = hash('SHA256', FEED_CRYPT_KEY, true);
  24
  25                 $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,
  26                         MCRYPT_MODE_CBC), MCRYPT_RAND);
  27
  28                 $encstr = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $str,
  29                         MCRYPT_MODE_CBC, $iv);
  30
  31                 $iv_base64 = base64_encode($iv);
  32                 $encstr_base64 = base64_encode($encstr);
  33
  34                 return "$iv_base64:$encstr_base64";
  35         }
  36 ?>