| <?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; | |
| } | |
| } | |