libraries/mcrypt.lib.php

   1 <?php
   2
   3 /* $Id$ */
   4 // vim: expandtab sw=4 ts=4 sts=4:
   5
   6 /**
   7  * Initialization
   8  */
   9
  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     $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC), MCRYPT_RAND);
  17     setcookie('pma_mcrypt_iv',
  18         base64_encode($iv),
  19         time() + (60 * 60 * 24 * 30),
  20         $GLOBALS['cookie_path'], '',
  21         $GLOBALS['is_https']);
  22 } else {
  23     $iv = base64_decode($_COOKIE['pma_mcrypt_iv']);
  24 }
  25
  26 /**
  27  * String padding
  28  *
  29  * @param   string  input string
  30  * @param   integer length of the result
  31  * @param   string  the filling string
  32  * @param   integer padding mode
  33  *
  34  * @return  string  the padded string
  35  *
  36  * @access  public
  37  */
  38 function full_str_pad($input, $pad_length, $pad_string = '', $pad_type = 0) {
  39     $str = '';
  40     $length = $pad_length - strlen($input);
  41     if ($length > 0) { // str_repeat doesn't like negatives
  42         if ($pad_type == STR_PAD_RIGHT) { // STR_PAD_RIGHT == 1
  43             $str = $input.str_repeat($pad_string, $length);
  44         } elseif ($pad_type == STR_PAD_BOTH) { // STR_PAD_BOTH == 2
  45             $str = str_repeat($pad_string, floor($length/2));
  46             $str .= $input;
  47             $str .= str_repeat($pad_string, ceil($length/2));
  48         } else { // defaults to STR_PAD_LEFT == 0
  49             $str = str_repeat($pad_string, $length).$input;
  50         }
  51     } else { // if $length is negative or zero we don't need to do anything
  52         $str = $input;
  53     }
  54     return $str;
  55 }
  56 /**
  57  * Encryption using blowfish algorithm (mcrypt)
  58  *
  59  * @param   string  original data
  60  * @param   string  the secret
  61  *
  62  * @return  string  the encrypted result
  63  *
  64  * @access  public
  65  *
  66  * @author  lem9
  67  */
  68 function PMA_blowfish_encrypt($data, $secret) {
  69     global $iv;
  70     // Seems we don't need the padding. Anyway if we need it,
  71     // we would have to replace 8 by the next 8-byte boundary.
  72     //$data = full_str_pad($data, 8, "\0", STR_PAD_RIGHT);
  73     return base64_encode(mcrypt_encrypt(MCRYPT_BLOWFISH, $secret, $data, MCRYPT_MODE_CBC, $iv));
  74 }
  75
  76 /**
  77  * Decryption using blowfish algorithm (mcrypt)
  78  *
  79  * @param   string  encrypted data
  80  * @param   string  the secret
  81  *
  82  * @return  string  original data
  83  *
  84  * @access  public
  85  *
  86  * @author  lem9
  87  */
  88 function PMA_blowfish_decrypt($encdata, $secret) {
  89     global $iv;
  90     return trim(mcrypt_decrypt(MCRYPT_BLOWFISH, $secret, base64_decode($encdata), MCRYPT_MODE_CBC, $iv));
  91 }
  92
  93 ?>