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-rw-r--r--extlib/Auth/OpenID/DiffieHellman.php113
1 files changed, 113 insertions, 0 deletions
diff --git a/extlib/Auth/OpenID/DiffieHellman.php b/extlib/Auth/OpenID/DiffieHellman.php
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+++ b/extlib/Auth/OpenID/DiffieHellman.php
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+<?php
+
+/**
+ * The OpenID library's Diffie-Hellman implementation.
+ *
+ * PHP versions 4 and 5
+ *
+ * LICENSE: See the COPYING file included in this distribution.
+ *
+ * @access private
+ * @package OpenID
+ * @author JanRain, Inc. <openid@janrain.com>
+ * @copyright 2005-2008 Janrain, Inc.
+ * @license http://www.apache.org/licenses/LICENSE-2.0 Apache
+ */
+
+require_once 'Auth/OpenID.php';
+require_once 'Auth/OpenID/BigMath.php';
+
+function Auth_OpenID_getDefaultMod()
+{
+ return '155172898181473697471232257763715539915724801'.
+ '966915404479707795314057629378541917580651227423'.
+ '698188993727816152646631438561595825688188889951'.
+ '272158842675419950341258706556549803580104870537'.
+ '681476726513255747040765857479291291572334510643'.
+ '245094715007229621094194349783925984760375594985'.
+ '848253359305585439638443';
+}
+
+function Auth_OpenID_getDefaultGen()
+{
+ return '2';
+}
+
+/**
+ * The Diffie-Hellman key exchange class. This class relies on
+ * {@link Auth_OpenID_MathLibrary} to perform large number operations.
+ *
+ * @access private
+ * @package OpenID
+ */
+class Auth_OpenID_DiffieHellman {
+
+ var $mod;
+ var $gen;
+ var $private;
+ var $lib = null;
+
+ function Auth_OpenID_DiffieHellman($mod = null, $gen = null,
+ $private = null, $lib = null)
+ {
+ if ($lib === null) {
+ $this->lib =& Auth_OpenID_getMathLib();
+ } else {
+ $this->lib =& $lib;
+ }
+
+ if ($mod === null) {
+ $this->mod = $this->lib->init(Auth_OpenID_getDefaultMod());
+ } else {
+ $this->mod = $mod;
+ }
+
+ if ($gen === null) {
+ $this->gen = $this->lib->init(Auth_OpenID_getDefaultGen());
+ } else {
+ $this->gen = $gen;
+ }
+
+ if ($private === null) {
+ $r = $this->lib->rand($this->mod);
+ $this->private = $this->lib->add($r, 1);
+ } else {
+ $this->private = $private;
+ }
+
+ $this->public = $this->lib->powmod($this->gen, $this->private,
+ $this->mod);
+ }
+
+ function getSharedSecret($composite)
+ {
+ return $this->lib->powmod($composite, $this->private, $this->mod);
+ }
+
+ function getPublicKey()
+ {
+ return $this->public;
+ }
+
+ function usingDefaultValues()
+ {
+ return ($this->mod == Auth_OpenID_getDefaultMod() &&
+ $this->gen == Auth_OpenID_getDefaultGen());
+ }
+
+ function xorSecret($composite, $secret, $hash_func)
+ {
+ $dh_shared = $this->getSharedSecret($composite);
+ $dh_shared_str = $this->lib->longToBinary($dh_shared);
+ $hash_dh_shared = $hash_func($dh_shared_str);
+
+ $xsecret = "";
+ for ($i = 0; $i < Auth_OpenID::bytes($secret); $i++) {
+ $xsecret .= chr(ord($secret[$i]) ^ ord($hash_dh_shared[$i]));
+ }
+
+ return $xsecret;
+ }
+}
+
+?>