File zp-extensions/federated_logon/Auth/OpenID/DiffieHellman.php

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  1: <?php
  2: 
  3: /**
  4:  * The OpenID library's Diffie-Hellman implementation.
  5:  *
  6:  * PHP versions 4 and 5
  7:  *
  8:  * LICENSE: See the COPYING file included in this distribution.
  9:  *
 10:  * @access private
 11:  * @package OpenID
 12:  * @author JanRain, Inc. <openid@janrain.com>
 13:  * @copyright 2005-2008 Janrain, Inc.
 14:  * @license http://www.apache.org/licenses/LICENSE-2.0 Apache
 15:  */
 16: 
 17: require_once 'Auth/OpenID.php';
 18: require_once 'Auth/OpenID/BigMath.php';
 19: 
 20: function Auth_OpenID_getDefaultMod()
 21: {
 22:     return '155172898181473697471232257763715539915724801'.
 23:         '966915404479707795314057629378541917580651227423'.
 24:         '698188993727816152646631438561595825688188889951'.
 25:         '272158842675419950341258706556549803580104870537'.
 26:         '681476726513255747040765857479291291572334510643'.
 27:         '245094715007229621094194349783925984760375594985'.
 28:         '848253359305585439638443';
 29: }
 30: 
 31: function Auth_OpenID_getDefaultGen()
 32: {
 33:     return '2';
 34: }
 35: 
 36: /**
 37:  * The Diffie-Hellman key exchange class.  This class relies on
 38:  * {@link Auth_OpenID_MathLibrary} to perform large number operations.
 39:  *
 40:  * @access private
 41:  * @package OpenID
 42:  */
 43: class Auth_OpenID_DiffieHellman {
 44: 
 45:     var $mod;
 46:     var $gen;
 47:     var $private;
 48:     var $lib = null;
 49: 
 50:     function Auth_OpenID_DiffieHellman($mod = null, $gen = null,
 51:                                        $private = null, $lib = null)
 52:     {
 53:         if ($lib === null) {
 54:             $this->lib = Auth_OpenID_getMathLib();
 55:         } else {
 56:             $this->lib = $lib;
 57:         }
 58: 
 59:         if ($mod === null) {
 60:             $this->mod = $this->lib->init(Auth_OpenID_getDefaultMod());
 61:         } else {
 62:             $this->mod = $mod;
 63:         }
 64: 
 65:         if ($gen === null) {
 66:             $this->gen = $this->lib->init(Auth_OpenID_getDefaultGen());
 67:         } else {
 68:             $this->gen = $gen;
 69:         }
 70: 
 71:         if ($private === null) {
 72:             $r = $this->lib->rand($this->mod);
 73:             $this->private = $this->lib->add($r, 1);
 74:         } else {
 75:             $this->private = $private;
 76:         }
 77: 
 78:         $this->public = $this->lib->powmod($this->gen, $this->private,
 79:                                            $this->mod);
 80:     }
 81: 
 82:     function getSharedSecret($composite)
 83:     {
 84:         return $this->lib->powmod($composite, $this->private, $this->mod);
 85:     }
 86: 
 87:     function getPublicKey()
 88:     {
 89:         return $this->public;
 90:     }
 91: 
 92:     function usingDefaultValues()
 93:     {
 94:         return ($this->mod == Auth_OpenID_getDefaultMod() &&
 95:                 $this->gen == Auth_OpenID_getDefaultGen());
 96:     }
 97: 
 98:     function xorSecret($composite, $secret, $hash_func)
 99:     {
100:         $dh_shared = $this->getSharedSecret($composite);
101:         $dh_shared_str = $this->lib->longToBinary($dh_shared);
102:         $hash_dh_shared = $hash_func($dh_shared_str);
103: 
104:         $xsecret = "";
105:         for ($i = 0; $i < Auth_OpenID::bytes($secret); $i++) {
106:             $xsecret .= chr(ord($secret[$i]) ^ ord($hash_dh_shared[$i]));
107:         }
108: 
109:         return $xsecret;
110:     }
111: }
112: 
113: 
114: