forked from extern/egroupware
124 lines
4.0 KiB
PHP
124 lines
4.0 KiB
PHP
<?php
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/**************************************************************************\
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* phpGroupWare *
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* http://www.phpgroupware.org *
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* -------------------------------------------- *
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* This program is free software; you can redistribute it and/or modify it *
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* under the terms of the GNU General Public License as published by the *
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* Free Software Foundation; either version 2 of the License, or (at your *
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* option) any later version. *
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\**************************************************************************/
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/* $Id$ */
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class crypto {
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var $td = False; // Handle for mcrypt
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var $iv = "";
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var $key = "";
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function crypto($key,$iv)
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{
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global $phpgw, $phpgw_info;
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if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
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if ($phpgw_info["server"]["mcrypt_version"] == "old") {
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$this->td = false;
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if (PHP_VERSION > "4.0.2pl1") {
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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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} else {
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$keysize = 8;
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$ivsize = 8;
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}
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} else {
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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; $i++) {
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$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; $i++) {
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$this->key .= $key[$i % $x];
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}
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if ($phpgw_info["server"]["mcrypt_version"] != "old") {
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mcrypt_generic_init ($this->td, $this->key, $this->iv);
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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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global $phpgw_info;
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if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
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if ($phpgw_info["server"]["mcrypt_version"] != "old") {
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mcrypt_generic_end ($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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global $phpgw_info;
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$data = serialize($data);
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// Disable all encryption if the admin didn't set it up
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if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
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switch ($phpgw_info["server"]["mcrypt_version"]) {
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// The old code, only works with mcrypt <= 2.2.x
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case "old": {
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$encrypteddata = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_ENCRYPT);
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break;
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}
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default: { // Handle 2.4 and newer API
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$encrypteddata = mcrypt_generic($this->td, $data);
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}
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}
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$encrypteddata = bin2hex($encrypteddata);
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return $encrypteddata;
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} else { // 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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global $phpgw_info;
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// Disable all encryption if the admin didn't set it up
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if ($phpgw_info["server"]["mcrypt_enabled"] && extension_loaded("mcrypt")) {
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$data = $this->hex2bin($encrypteddata);
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switch ($phpgw_info["server"]["mcrypt_version"]) {
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// The old code, only works with mcrypt <= 2.2.x
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case "old": {
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$data = mcrypt_cbc(MCRYPT_TripleDES, $this->key, $data, MCRYPT_DECRYPT);
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break;
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}
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default: { // Handle 2.4 and newer API
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$data = mdecrypt_generic($this->td, $data);
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}
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}
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return unserialize($data);
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} else {
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return unserialize($encrypteddata);
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}
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}
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} // class crypto
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