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77 lines
2.8 KiB
PHP
77 lines
2.8 KiB
PHP
<?php
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/**********************************************************\
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| The implementation of PHPRPC Protocol 3.0 |
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| dhparams.php |
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| Release 3.0.1 |
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| Copyright by Team-PHPRPC |
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| WebSite: http://www.phprpc.org/ |
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| http://www.phprpc.net/ |
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| http://www.phprpc.com/ |
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| http://sourceforge.net/projects/php-rpc/ |
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| Authors: Ma Bingyao <andot@ujn.edu.cn> |
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| This file may be distributed and/or modified under the |
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| terms of the GNU General Public License (GPL) version |
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| 2.0 as published by the Free Software Foundation and |
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| appearing in the included file LICENSE. |
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\**********************************************************/
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/* Diffie-Hellman Parameters for PHPRPC.
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*
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* Copyright: Ma Bingyao <andot@ujn.edu.cn>
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* Version: 1.2
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* LastModified: Apr 12, 2010
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* This library is free. You can redistribute it and/or modify it under GPL.
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*/
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class DHParams {
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var $len;
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var $dhParams;
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function getNearest($n, $a) {
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$j = 0;
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$m = abs($a[0] - $n);
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for ($i = 1; $i < count($a); $i++) {
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$t = abs($a[$i] - $n);
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if ($m > $t) {
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$m = $t;
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$j = $i;
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}
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}
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return $a[$j];
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}
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function DHParams($len = 128) {
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if (extension_loaded('gmp')) {
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$a = array(96, 128, 160, 192, 256, 512, 768, 1024, 1536, 2048, 3072, 4096);
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}
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else if (extension_loaded('big_int')) {
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$a = array(96, 128, 160, 192, 256, 512, 768, 1024, 1536);
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}
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else if (extension_loaded('bcmath')) {
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$a = array(96, 128, 160, 192, 256, 512);
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}
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else {
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$a = array(96, 128, 160);
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}
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$this->len = $this->getNearest($len, $a);
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$dhParams = unserialize(file_get_contents("dhparams/{$this->len}.dhp", true));
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$this->dhParams = $dhParams[mt_rand(0, count($dhParams) - 1)];
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}
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function getL() {
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return $this->len;
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}
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function getP() {
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return $this->dhParams['p'];
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}
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function getG() {
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return $this->dhParams['g'];
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}
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function getDHParams() {
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return $this->dhParams;
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}
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}
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?>
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