114 lines
2.9 KiB
PHP
114 lines
2.9 KiB
PHP
<?php
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/**
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* The OpenID library's Diffie-Hellman implementation.
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*
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* PHP versions 4 and 5
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*
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* LICENSE: See the COPYING file included in this distribution.
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*
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* @access private
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* @package OpenID
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* @author JanRain, Inc. <openid@janrain.com>
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* @copyright 2005-2008 Janrain, Inc.
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
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*/
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require_once 'Auth/OpenID.php';
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require_once 'Auth/OpenID/BigMath.php';
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function Auth_OpenID_getDefaultMod()
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{
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return '155172898181473697471232257763715539915724801'.
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'966915404479707795314057629378541917580651227423'.
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'698188993727816152646631438561595825688188889951'.
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'272158842675419950341258706556549803580104870537'.
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'681476726513255747040765857479291291572334510643'.
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'245094715007229621094194349783925984760375594985'.
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'848253359305585439638443';
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}
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function Auth_OpenID_getDefaultGen()
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{
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return '2';
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}
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/**
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* The Diffie-Hellman key exchange class. This class relies on
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* {@link Auth_OpenID_MathLibrary} to perform large number operations.
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*
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* @access private
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* @package OpenID
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*/
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class Auth_OpenID_DiffieHellman {
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var $mod;
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var $gen;
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var $private;
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var $lib = null;
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function Auth_OpenID_DiffieHellman($mod = null, $gen = null,
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$private = null, $lib = null)
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{
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if ($lib === null) {
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$this->lib = Auth_OpenID_getMathLib();
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} else {
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$this->lib = $lib;
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}
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if ($mod === null) {
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$this->mod = $this->lib->init(Auth_OpenID_getDefaultMod());
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} else {
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$this->mod = $mod;
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}
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if ($gen === null) {
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$this->gen = $this->lib->init(Auth_OpenID_getDefaultGen());
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} else {
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$this->gen = $gen;
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}
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if ($private === null) {
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$r = $this->lib->rand($this->mod);
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$this->private = $this->lib->add($r, 1);
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} else {
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$this->private = $private;
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}
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$this->public = $this->lib->powmod($this->gen, $this->private,
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$this->mod);
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}
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function getSharedSecret($composite)
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{
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return $this->lib->powmod($composite, $this->private, $this->mod);
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}
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function getPublicKey()
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{
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return $this->public;
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}
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function usingDefaultValues()
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{
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return ($this->mod == Auth_OpenID_getDefaultMod() &&
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$this->gen == Auth_OpenID_getDefaultGen());
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}
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function xorSecret($composite, $secret, $hash_func)
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{
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$dh_shared = $this->getSharedSecret($composite);
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$dh_shared_str = $this->lib->longToBinary($dh_shared);
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$hash_dh_shared = $hash_func($dh_shared_str);
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$xsecret = "";
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for ($i = 0; $i < Auth_OpenID::bytes($secret); $i++) {
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$xsecret .= chr(ord($secret[$i]) ^ ord($hash_dh_shared[$i]));
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}
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return $xsecret;
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}
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}
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