DiffieHellmanKeyPair.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2007 by Anton E. Lebedevich                             *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 /* $Id: DiffieHellmanKeyPair.class.php 4687 2007-12-09 18:57:18Z voxus $ */
00012 
00018     final class DiffieHellmanKeyPair implements KeyPair
00019     {
00020         private $private    = null;
00021         private $public     = null;
00022         private $parameters = null;
00023         
00024         public function __construct(DiffieHellmanParameters $parameters)
00025         {
00026             $this->parameters = $parameters;
00027         }
00028         
00032         public static function create(DiffieHellmanParameters $parameters)
00033         {
00034             return new self($parameters);
00035         }
00036         
00040         public static function generate(
00041             DiffieHellmanParameters $parameters,
00042             RandomSource $randomSource
00043         )
00044         {
00045             $result = new self($parameters);
00046             
00047             $factory = $parameters->getModulus()->getFactory();
00048             
00049             $result->private = $factory->makeRandom(
00050                 $parameters->getModulus(),
00051                 $randomSource
00052             );
00053             
00054             $result->public = $parameters->getGen()->modPow(
00055                 $result->private,
00056                 $parameters->getModulus()
00057             );
00058             
00059             return $result;
00060         }
00061         
00065         public function setPrivate(BigInteger $private)
00066         {
00067             $this->private = $private;
00068             return $this;
00069         }
00070         
00074         public function getPrivate()
00075         {
00076             return $this->private;
00077         }
00078         
00082         public function setPublic(BigInteger $public)
00083         {
00084             $this->public = $public;
00085             return $this;
00086         }
00087         
00091         public function getPublic()
00092         {
00093             return $this->public;
00094         }
00095         
00099         public function makeSharedKey(BigInteger $otherSitePublic)
00100         {
00101             Assert::brothers($this->private, $otherSitePublic);
00102             
00103             return $otherSitePublic->modPow(
00104                 $this->private,
00105                 $this->parameters->getModulus()
00106             );
00107         }
00108     }
00109 ?>

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