egroupware/phpgwapi/inc/class.crypto.inc.php

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<?php
/**************************************************************************\
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* phpGroupWare API - Crypto *
* This file written by Joseph Engo <jengo@phpgroupware.org> *
* Handles encrypting strings based on various encryption schemes *
* Copyright (C) 2000, 2001 Dan Kuykendall *
* -------------------------------------------------------------------------*
* This library is part of the phpGroupWare API *
* http://www.phpgroupware.org/api *
* ------------------------------------------------------------------------ *
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* This library is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 2.1 of the License, *
* or any later version. *
* This library is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU Lesser General Public License for more details. *
* You should have received a copy of the GNU Lesser General Public License *
* along with this library; if not, write to the Free Software Foundation, *
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
\**************************************************************************/
/* $Id$ */
class crypto {
var $td = False; // Handle for mcrypt
var $iv = "";
var $key = "";
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function crypto($vars)
{
global $phpgw, $phpgw_info;
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$key = $vars[0];
$iv = $vars[1];
if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
if ($phpgw_info["server"]["versions"]["mcrypt"] == "old") {
$this->td = false;
if (PHP_VERSION > "4.0.2pl1") {
$keysize = mcrypt_get_key_size(MCRYPT_TRIPLEDES);
$ivsize = mcrypt_get_iv_size(MCRYPT_TRIPLEDES,MCRYPT_MODE_CBC);
} else {
$keysize = 8;
$ivsize = 8;
}
} else {
// Start up mcrypt
$this->td = mcrypt_module_open (MCRYPT_TRIPLEDES, "", MCRYPT_MODE_CBC, "");
$ivsize = mcrypt_enc_get_iv_size($this->td);
$keysize = mcrypt_enc_get_key_size($this->td);
}
// Hack IV to be the correct size
$x = strlen($iv);
for ($i = 0; $i < $ivsize; $i++) {
$this->iv .= $iv[$i % $x];
}
// Hack Key to be the correct size
$x = strlen($key);
for ($i = 0; $i < $keysize; $i++) {
$this->key .= $key[$i % $x];
}
if ($phpgw_info["server"]["versions"]["mcrypt"] != "old") {
mcrypt_generic_init ($this->td, $this->key, $this->iv);
}
}
// If mcrypt isn't loaded key and iv are not needed
}
function cleanup()
{
global $phpgw_info;
if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
if ($phpgw_info["server"]["versions"]["mcrypt"] != "old") {
mcrypt_generic_end ($this->td);
}
}
}
function hex2bin($data)
{
$len = strlen($data);
return pack("H" . $len, $data);
}
function encrypt($data) {
global $phpgw_info;
$data = serialize($data);
// Disable all encryption if the admin didn't set it up
if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
switch ($phpgw_info["server"]["versions"]["mcrypt"]) {
// The old code, only works with mcrypt <= 2.2.x
case "old": {
$encrypteddata = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_ENCRYPT);
break;
}
default: { // Handle 2.4 and newer API
$encrypteddata = mcrypt_generic($this->td, $data);
}
}
$encrypteddata = bin2hex($encrypteddata);
return $encrypteddata;
} else { // No mcrypt == insecure !
return $data;
}
}
function decrypt($encrypteddata) {
global $phpgw_info;
// Disable all encryption if the admin didn't set it up
if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
$data = $this->hex2bin($encrypteddata);
switch ($phpgw_info["server"]["versions"]["mcrypt"]) {
// The old code, only works with mcrypt <= 2.2.x
case "old": {
$data = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_DECRYPT);
break;
}
default: { // Handle 2.4 and newer API
$data = mdecrypt_generic($this->td, $data);
}
}
return unserialize($data);
} else {
return unserialize($encrypteddata);
}
}
} // class crypto