forked from extern/egroupware
297 lines
7.9 KiB
PHP
297 lines
7.9 KiB
PHP
<?php
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/**************************************************************************\
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* eGroupWare API - Crypto *
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* This file written by Joseph Engo <jengo@phpgroupware.org> *
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* Handles encrypting strings based on various encryption schemes *
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* Copyright (C) 2000, 2001 Dan Kuykendall *
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* -------------------------------------------------------------------------*
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* This library is part of the eGroupWare API *
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* http://www.egroupware.org/api *
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* -------------------------------------------------------------------------*
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* This library is free software; you can redistribute it and/or modify it *
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* under the terms of the GNU Lesser General Public License as published by *
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* the Free Software Foundation; either version 2.1 of the License, *
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* or any later version. *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* See the GNU Lesser General Public License for more details. *
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* You should have received a copy of the GNU Lesser General Public License *
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* along with this library; if not, write to the Free Software Foundation, *
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
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\**************************************************************************/
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/* $Id$ */
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class crypto
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{
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var $enabled = False;
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var $debug = False;
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var $mcrypt_version = '';
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var $algo = MCRYPT_TRIPLEDES;
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var $mode = MCRYPT_MODE_CBC;
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var $td = False; /* Handle for mcrypt */
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var $iv = '';
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var $key = '';
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function crypto($vars='')
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{
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if($GLOBALS['phpgw_info']['flags']['currentapp'] == 'login' ||
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$GLOBALS['phpgw_info']['flags']['currentapp'] == 'logout' ||
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$GLOBALS['phpgw_info']['flags']['currentapp'] == 'home'
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)
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{
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$this->debug = False;
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}
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if(is_array($vars))
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{
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$this->init($vars);
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}
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}
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function init($vars)
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{
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/* _debug_array(mcrypt_list_algorithms()); */
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$key = $vars[0];
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$iv = $vars[1];
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if($GLOBALS['phpgw_info']['server']['mcrypt_enabled'] && extension_loaded('mcrypt'))
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{
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if($GLOBALS['phpgw_info']['server']['mcrypt_algo'])
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{
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$this->algo = $GLOBALS['phpgw_info']['server']['mcrypt_algo'];
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}
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if($GLOBALS['phpgw_info']['server']['mcrypt_mode'])
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{
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$this->mode = $GLOBALS['phpgw_info']['server']['mcrypt_mode'];
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}
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if($this->debug)
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{
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echo '<br>crypto: algorithm=' . $this->algo;
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echo '<br>crypto: mode =' . $this->mode;
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}
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$this->enabled = True;
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$this->mcrypt_version = $GLOBALS['phpgw_info']['server']['versions']['mcrypt'];
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if($this->mcrypt_version == 'old')
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{
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$this->td = False;
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if(phpversion() > '4.0.2pl1')
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{
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$keysize = mcrypt_get_key_size($this->algo);
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$ivsize = mcrypt_get_iv_size($this->algo,$this->mode);
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}
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else
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{
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$keysize = 8;
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$ivsize = 8;
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}
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}
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else
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{
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/* Start up mcrypt */
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$this->td = mcrypt_module_open($this->algo, '', $this->mode, '');
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$ivsize = mcrypt_enc_get_iv_size($this->td);
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$keysize = mcrypt_enc_get_key_size($this->td);
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}
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/* Hack IV to be the correct size */
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$x = strlen($iv);
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$this->iv = '';
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for($i = 0; $i < $ivsize; $i++)
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{
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$this->iv .= $iv[$i % $x];
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}
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/* Hack Key to be the correct size */
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$x = strlen($key);
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$this->key = '';
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for($i = 0; $i < $keysize; $i++)
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{
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$this->key .= $key[$i % $x];
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}
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}
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else
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{
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/* If mcrypt isn't loaded, key and iv are not needed. */
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if($this->debug)
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{
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echo '<br>crypto: mycrypt unavailable or disabled';
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}
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}
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}
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function cleanup()
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{
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if($this->enabled)
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{
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if($this->mcrypt_version != 'old')
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{
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if(function_exists('mcrypt_generic_deinit'))
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{
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mcrypt_generic_deinit($this->td);
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}
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else
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{
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mcrypt_generic_end($this->td);
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}
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}
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}
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}
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function hex2bin($data)
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{
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$len = strlen($data);
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return pack('H'.$len, $data);
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}
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function encrypt($data)
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->encrypt() unencrypted data: ---->>>>' . $data . "\n";
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}
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if(is_array($data) || is_object($data))
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->encrypt() found an "' . gettype($data) . '". Serializing...' . "\n";
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}
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$data = serialize($data);
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$_obj = True;
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}
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else
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->encrypt() found "' . gettype($data) . '". No serialization...' . "\n";
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}
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}
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/* Disable all encryption if the admin didn't set it up */
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if($this->enabled)
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{
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if($_obj)
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->encrypt() adding slashes' . "\n";
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}
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$data = addslashes($data);
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}
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->encrypt() data: ---->>>>' . $data;
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}
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switch($this->mcrypt_version)
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{
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case 'old':
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/* The old code, only works with mcrypt <= 2.2.x */
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$encrypteddata = mcrypt_cbc($this->algo, $this->key, $data, MCRYPT_ENCRYPT);
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break;
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default:
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/* Handle 2.4 and newer API */
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mcrypt_generic_init($this->td, $this->key, $this->iv);
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$encrypteddata = mcrypt_generic($this->td, $data);
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break;
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}
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$encrypteddata = bin2hex($encrypteddata);
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->encrypt() crypted data: ---->>>>' . $encrypteddata;
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}
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return $encrypteddata;
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}
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else
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{
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/* No mcrypt == insecure ! */
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->encrypt() crypted data: ---->>>>' . $data;
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}
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return $data;
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}
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}
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function decrypt($encrypteddata)
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->decrypt() crypted data: ---->>>>' . $encrypteddata;
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}
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/* Disable all encryption if the admin didn't set it up */
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if($this->enabled)
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{
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$data = $this->hex2bin($encrypteddata);
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switch($this->mcrypt_version)
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{
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case 'old':
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/* The old code, only works with mcrypt <= 2.2.x */
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$data = mcrypt_cbc($this->algo, $this->key, $data, MCRYPT_DECRYPT);
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break;
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default:
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/* Handle 2.4 and newer API */
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mcrypt_generic_init($this->td, $this->key, $this->iv);
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$data = mdecrypt_generic($this->td, $data);
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break;
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}
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->decrypt() decrypted data: ---->>>>' . $data;
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}
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$test = stripslashes($data);
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if(@unserialize($test))
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->decrypt() stripping slashes' . "\n";
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}
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$data = $test;
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}
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unset($test);
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->decrypt() data: ---->>>>' . $data . "\n";
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}
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}
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else
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{
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/* No mcrypt == insecure ! */
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$data = $encrypteddata;
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}
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// Fix strange bug
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// Without this, somes ^@^@^@^@ appears in data
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$data = chop($data);
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$newdata = @unserialize($data);
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if($newdata)
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->decrypt() found serialized "' . gettype($newdata) . '". Unserializing...' . "\n";
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echo '<br>' . time() . ' crypto->decrypt() returning: '; _debug_array($newdata);
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}
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return $newdata;
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}
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else
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{
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if($this->debug)
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{
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echo '<br>' . time() . ' crypto->decrypt() found UNserialized "' . gettype($data) . '". No unserialization...' . "\n";
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echo '<br>' . time() . ' crypto->decrypt() returning: ' . $data;
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}
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return $data;
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}
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}
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} // class crypto
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?>
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