libraries/mcrypt.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  *
   5  * @version $Id$
   6  */
   7
   8 /**
   9  * Initialization
  10  * Store the initialization vector because it will be needed for
  11  * further decryption. I don't think necessary to have one iv
  12  * per server so I don't put the server number in the cookie name.
  13  */
  14 if (!isset($_COOKIE['pma_mcrypt_iv'])) {
  15     srand((double) microtime() * 1000000);
  16     $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC), MCRYPT_RAND);
  17     PMA_setCookie('pma_mcrypt_iv', base64_encode($iv));
  18 } else {
  19     $iv = base64_decode($_COOKIE['pma_mcrypt_iv']);
  20 }
  21
  22 /**
  23  * String padding
  24  *
  25  * @param   string  input string
  26  * @param   integer length of the result
  27  * @param   string  the filling string
  28  * @param   integer padding mode
  29  *
  30  * @return  string  the padded string
  31  *
  32  * @access  public
  33  */
  34 function full_str_pad($input, $pad_length, $pad_string = '', $pad_type = 0) {
  35     $str = '';
  36     $length = $pad_length - strlen($input);
  37     if ($length > 0) { // str_repeat doesn't like negatives
  38         if ($pad_type == STR_PAD_RIGHT) { // STR_PAD_RIGHT == 1
  39             $str = $input.str_repeat($pad_string, $length);
  40         } elseif ($pad_type == STR_PAD_BOTH) { // STR_PAD_BOTH == 2
  41             $str = str_repeat($pad_string, floor($length/2));
  42             $str .= $input;
  43             $str .= str_repeat($pad_string, ceil($length/2));
  44         } else { // defaults to STR_PAD_LEFT == 0
  45             $str = str_repeat($pad_string, $length).$input;
  46         }
  47     } else { // if $length is negative or zero we don't need to do anything
  48         $str = $input;
  49     }
  50     return $str;
  51 }
  52 /**
  53  * Encryption using blowfish algorithm (mcrypt)
  54  *
  55  * @param   string  original data
  56  * @param   string  the secret
  57  *
  58  * @return  string  the encrypted result
  59  *
  60  * @access  public
  61  *
  62  * @author  lem9
  63  */
  64 function PMA_blowfish_encrypt($data, $secret) {
  65     global $iv;
  66     // Seems we don't need the padding. Anyway if we need it,
  67     // we would have to replace 8 by the next 8-byte boundary.
  68     //$data = full_str_pad($data, 8, "\0", STR_PAD_RIGHT);
  69     return base64_encode(mcrypt_encrypt(MCRYPT_BLOWFISH, $secret, $data, MCRYPT_MODE_CBC, $iv));
  70 }
  71
  72 /**
  73  * Decryption using blowfish algorithm (mcrypt)
  74  *
  75  * @param   string  encrypted data
  76  * @param   string  the secret
  77  *
  78  * @return  string  original data
  79  *
  80  * @access  public
  81  *
  82  * @author  lem9
  83  */
  84 function PMA_blowfish_decrypt($encdata, $secret) {
  85     global $iv;
  86     return trim(mcrypt_decrypt(MCRYPT_BLOWFISH, $secret, base64_decode($encdata), MCRYPT_MODE_CBC, $iv));
  87 }
  88
  89 ?>