forked from extern/egroupware
248 lines
6.7 KiB
PHP
248 lines
6.7 KiB
PHP
<?php
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/**************************************************************************\
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* phpGroupWare 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 phpGroupWare API *
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* http://www.phpgroupware.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 $mcrypt_version = '';
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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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$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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$this->enabled = True;
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$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(MCRYPT_TRIPLEDES);
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$ivsize = mcrypt_get_iv_size(MCRYPT_TRIPLEDES,MCRYPT_MODE_CBC);
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}
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else
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{
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$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 (MCRYPT_TRIPLEDES, '', MCRYPT_MODE_CBC, '');
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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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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($key);
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for ($i = 0; $i < $keysize; $i++)
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{
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$this->key .= $key[$i % $x];
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}
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}
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// If mcrypt isn't loaded key and iv are not needed
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}
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function cleanup()
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{
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if ($this->enabled)
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{
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if ($this->mcrypt_version != 'old')
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{
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mcrypt_generic_end ($this->td);
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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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$data = serialize($data);
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$data = addslashes($data);
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// Disable all encryption if the admin didn't set it up
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if ($this->enabled)
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{
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switch ($this->mcrypt_version)
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{
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// The old code, only works with mcrypt <= 2.2.x
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case 'old':
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{
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$encrypteddata = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_ENCRYPT);
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break;
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}
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default:
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{ // Handle 2.4 and newer API
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mcrypt_generic_init ($this->td, $this->key, $this->iv);
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$encrypteddata = mcrypt_generic($this->td, $data);
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break;
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}
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}
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$encrypteddata = bin2hex($encrypteddata);
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return $encrypteddata;
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}
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else
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{ // No mcrypt == insecure !
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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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// 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 ($this->mcrypt_version)
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{
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// The old code, only works with mcrypt <= 2.2.x
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case 'old':
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$data = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_DECRYPT);
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break;
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// Handle 2.4 and newer API
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default:
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mcrypt_generic_init ($this->td, $this->key, $this->iv);
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$data = mdecrypt_generic($this->td, $data);
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break;
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}
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}
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else
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{
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$data = $encrypteddata;
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}
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if(!strpos(' '.$data,'O:8:"stdClass"'))
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{
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return unserialize($data);
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}
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else
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{
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$data = stripslashes($data);
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return $data;
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}
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}
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function encrypt_mail_pass($data)
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{
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// Disable all encryption if the admin didn't set it up
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if ($this->enabled)
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{
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// ONLY manipulate data if we are going to encrypt it
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// question: why do we sreialize and add slashes before encrypting?? (ed: Angles)
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$data = serialize($data);
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$data = addslashes($data);
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switch ($this->mcrypt_version)
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{
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// The old code, only works with mcrypt <= 2.2.x
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case 'old':
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{
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$encrypteddata = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_ENCRYPT);
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break;
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}
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default:
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{ // Handle 2.4 and newer API
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mcrypt_generic_init ($this->td, $this->key, $this->iv);
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$encrypteddata = mcrypt_generic($this->td, $data);
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break;
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}
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}
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$encrypteddata = bin2hex($encrypteddata);
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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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// Data should be returned *unmolested* if encryption is not enabled
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return $data;
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}
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}
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function decrypt_mail_pass($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 ($this->mcrypt_version)
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{
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// The old code, only works with mcrypt <= 2.2.x
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case 'old':
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$data = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_DECRYPT);
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break;
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// Handle 2.4 and newer API
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default:
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mcrypt_generic_init ($this->td, $this->key, $this->iv);
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$data = mdecrypt_generic($this->td, $data);
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break;
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}
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// hey -- since the encrypt() function calls serialize and then addslashes,
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// we should always do the reverse -- correct? (ed: Del)
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$data = stripslashes($data);
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$data = unserialize($data);
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// question: was it necessary to serialize and addslashes *before* encryption in the first place? (ed: Angles)
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}
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else
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{
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// Data should be returned *unmolested* if encryption is not enabled
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return $data;
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}
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/*
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// this is apparently intended to allow encryption of objects
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// at this point Dec 14, 2001, we simply need to handle strings correctly
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// which was broken previously (ed: Angles)
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if(!strpos(' '.$data,'O:8:"stdClass"'))
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{
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return unserialize($data);
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}
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else
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{
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$data = stripslashes($data);
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return $data;
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}
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*/
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}
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} // class crypto
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?>
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