includes/diffiehellman.php
author Dan Fuhry <dan@enanocms.org>
Tue, 06 Jul 2010 00:51:40 -0400
changeset 1262 8ebaa6c49745
parent 1261 beb0da036222
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Copyright (C) 2006-2009 Dan Fuhry
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 * diffiehellman.php - Diffie Hellman key exchange and supporting functions
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * The Diffie-Hellman key exchange protocol
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 */
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global $dh_supported;
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$dh_supported = true;
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try
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{
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	$GLOBALS['_math'] = enanomath_create();
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}
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catch ( Exception $e )
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{
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	$dh_supported = false;
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}
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// Our prime number as a base for operations.
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$GLOBALS['dh_prime'] = '7916586051748534588306961133067968196965257961415756656521818848750723547477673457670019632882524164647651492025728980571833579341743988603191694784406703';
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// g, a primitive root used as an exponent
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// (2 and 5 are acceptable, but BigInt is faster with odd numbers)
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$GLOBALS['dh_g'] = '5';
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/**
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 * Generates a Diffie-Hellman private key
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 * @return string(BigInt)
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 */
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function dh_gen_private()
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{
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	global $_math;
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	return $_math->random(256);
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}
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/**
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 * Calculates the public key from the private key
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 * @param string(BigInt)
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 * @return string(BigInt)
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 */
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function dh_gen_public($b)
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{
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	global $_math, $dh_g, $dh_prime;
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	return $_math->powmod($dh_g, $b, $dh_prime);
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}
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/**
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 * Calculates the shared secret.
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 * @param string(BigInt) Our private key
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 * @param string(BigInt) Remote party's public key
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 * @return string(BigInt)
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 */
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function dh_gen_shared_secret($a, $B)
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{
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	global $_math, $dh_g, $dh_prime;
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	return $_math->powmod($B, $a, $dh_prime);
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}
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/*
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SHA-256 algorithm - ported from Javascript
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Copyright (c) 2003-2004, Angel Marin
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All rights reserved.
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Portions copyright (c) 2008 Dan Fuhry.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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 * Redistributions of source code must retain the above copyright notice, this
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 	list of conditions and the following disclaimer.
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 * Redistributions in binary form must reproduce the above copyright notice,
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 	this list of conditions and the following disclaimer in the documentation
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 	and/or other materials provided with the distribution.
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 * Neither the name of the <ORGANIZATION> nor the names of its contributors may
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 	be used to endorse or promote products derived from this software without
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 	specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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class SHA256
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{
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	var $chrsz = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode  */
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	function safe_add ($x, $y) {
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		$lsw = ($x & 0xFFFF) + ($y & 0xFFFF);
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		$msw = ($x >> 16) + ($y >> 16) + ($lsw >> 16);
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		// 2009-07-02 Added & 0xFFFFFFFF here to fix problem on PHP w/ native 64-bit integer support (rev. 1030)
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		return (($msw << 16) | ($lsw & 0xFFFF)) & 0xFFFFFFFF;
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	}
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	function rshz($a, $b)
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	{
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		// equivalent to $X >>> $n in javascript
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		// pulled from http://www.tapouillo.com/firefox_extension/sourcecode.txt, public domain
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		$z = hexdec(80000000);
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		if ($z & $a)
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		{
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			$a = ($a>>1);
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			$a &= (~$z);
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			$a |= 0x40000000;
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			$a = ($a>>($b-1));
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
Dan Fuhry <dan@enanocms.org>
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		}
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
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   124
		else
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
Dan Fuhry <dan@enanocms.org>
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   125
		{
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
Dan Fuhry <dan@enanocms.org>
parents: 1227
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   126
			$a = ($a>>$b);
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
Dan Fuhry <dan@enanocms.org>
parents: 1227
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   127
		}
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
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		return $a;
1227
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   129
	}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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	function S ($X, $n) {return ( $this->rshz($X, $n) ) | ($X << (32 - $n));}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   131
	function R ($X, $n) {return ( $this->rshz($X, $n) );}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   132
	function Ch($x, $y, $z)  {return (($x & $y) ^ ((~$x) & $z));}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   133
	function Maj($x, $y, $z) {return (($x & $y) ^ ($x & $z) ^ ($y & $z));}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   134
	function Sigma0256($x) {return ($this->S($x, 2)  ^ $this->S($x, 13) ^ $this->S($x, 22));}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   135
	function Sigma1256($x) {return ($this->S($x, 6)  ^ $this->S($x, 11) ^ $this->S($x, 25));}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   136
	function Gamma0256($x) {return ($this->S($x, 7)  ^ $this->S($x, 18) ^ $this->R($x, 3));}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   137
	function Gamma1256($x) {return ($this->S($x, 17) ^ $this->S($x, 19) ^ $this->R($x, 10));}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   138
	function core_sha256 ($m, $l) {
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   139
			$K = Array(0x428A2F98,0x71374491,0xB5C0FBCF,0xE9B5DBA5,0x3956C25B,0x59F111F1,0x923F82A4,0xAB1C5ED5,0xD807AA98,0x12835B01,0x243185BE,0x550C7DC3,0x72BE5D74,0x80DEB1FE,0x9BDC06A7,0xC19BF174,0xE49B69C1,0xEFBE4786,0xFC19DC6,0x240CA1CC,0x2DE92C6F,0x4A7484AA,0x5CB0A9DC,0x76F988DA,0x983E5152,0xA831C66D,0xB00327C8,0xBF597FC7,0xC6E00BF3,0xD5A79147,0x6CA6351,0x14292967,0x27B70A85,0x2E1B2138,0x4D2C6DFC,0x53380D13,0x650A7354,0x766A0ABB,0x81C2C92E,0x92722C85,0xA2BFE8A1,0xA81A664B,0xC24B8B70,0xC76C51A3,0xD192E819,0xD6990624,0xF40E3585,0x106AA070,0x19A4C116,0x1E376C08,0x2748774C,0x34B0BCB5,0x391C0CB3,0x4ED8AA4A,0x5B9CCA4F,0x682E6FF3,0x748F82EE,0x78A5636F,0x84C87814,0x8CC70208,0x90BEFFFA,0xA4506CEB,0xBEF9A3F7,0xC67178F2);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   140
			$HASH = Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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   141
			$W = Array(64);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   142
			/* append padding */
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   143
			if ( !isset($m[$l >> 5]) )
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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diff changeset
   144
				$m[$l >> 5] = 0;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   145
			$m[$l >> 5] |= 0x80 << (24 - $l % 32);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   146
			$m[(($l + 64 >> 9) << 4) + 15] = $l;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   147
			for ( $i = 0; $i<count($m); $i+=16 ) {
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   148
					$a = $HASH[0];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   149
					$b = $HASH[1];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   150
					$c = $HASH[2];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   151
					$d = $HASH[3];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   152
					$e = $HASH[4];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   153
					$f = $HASH[5];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   154
					$g = $HASH[6];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   155
					$h = $HASH[7];
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   156
					for ( $j = 0; $j<64; $j++)
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   157
					{
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   158
							if ( $j < 16 )
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   159
							{
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   160
								$W[$j] = ( isset($m[$j + $i]) ) ? $m[$j + $i] : 0;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   161
							}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   162
							else
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   163
							{
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   164
								$W[$j] = $this->safe_add(
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   165
									$this->safe_add(
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   166
										$this->safe_add(
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   167
											$this->Gamma1256($W[$j - 2]), $W[$j - 7]),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   168
										$this->Gamma0256($W[$j - 15])),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   169
									$W[$j - 16]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   170
							}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   171
							$T1 = $this->safe_add(
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   172
								$this->safe_add(
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   173
									$this->safe_add(
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   174
										$this->safe_add($h, $this->Sigma1256($e)
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   175
											),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   176
										$this->Ch($e, $f, $g)),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   177
									$K[$j]),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   178
								$W[$j]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   179
							$T2 = $this->safe_add($this->Sigma0256($a), $this->Maj($a, $b, $c));
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   180
							$h = $g;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   181
							$g = $f;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   182
							$f = $e;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   183
							$e = $this->safe_add($d, $T1);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   184
							$d = $c;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   185
							$c = $b;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   186
							$b = $a;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   187
							$a = $this->safe_add($T1, $T2);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   188
					}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   189
					$HASH[0] = $this->safe_add($a, $HASH[0]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   190
					$HASH[1] = $this->safe_add($b, $HASH[1]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   191
					$HASH[2] = $this->safe_add($c, $HASH[2]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   192
					$HASH[3] = $this->safe_add($d, $HASH[3]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   193
					$HASH[4] = $this->safe_add($e, $HASH[4]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   194
					$HASH[5] = $this->safe_add($f, $HASH[5]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   195
					$HASH[6] = $this->safe_add($g, $HASH[6]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   196
					$HASH[7] = $this->safe_add($h, $HASH[7]);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
parents: 1081
diff changeset
   197
			}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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diff changeset
   198
			return $HASH;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
Dan
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diff changeset
   199
	}
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	function str2binb ($str) {
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		$bin = Array();
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		for ( $i = 0; $i < strlen($str); $i++ )
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		{
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			$byte = ord($str{$i});
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			$block = floor($i / 4);
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			$stage = $i % 4;
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			if ( $stage == 0 )
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			{
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				$bin[$block] = $byte;
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   210
			}
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   211
			else
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   212
			{
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				$bin[$block] <<= 8;
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				$bin[$block] |= $byte;
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   215
			}
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   216
		}
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		while ( $stage < 3 )
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		{
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			$stage++;
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			$bin[$block] <<= 8;
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   221
		}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   222
		return $bin;
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   223
	}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   224
	function byte2hex($byte)
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   225
	{
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   226
		$b = dechex(ord($byte));
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		return ( strlen($b) < 2 ) ? "0$b" : $b;
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   228
	}
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   229
	function binb2hex ($binarray) {
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		$hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
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		$hex_tab = $hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
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		$str = "";
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   233
		foreach ( $binarray as $bytes )
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   234
		{
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			$str .= implode('', array(
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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					$this->byte2hex(chr(( $bytes >> 24 ) & 0xFF)),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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					$this->byte2hex(chr(( $bytes >> 16 ) & 0xFF)),
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					$this->byte2hex(chr(( $bytes >> 8 ) & 0xFF)),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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diff changeset
   239
					$this->byte2hex(chr($bytes & 0xFF))
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   240
				));
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   241
		}
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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   242
		return $str;
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   243
	}
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   244
	function hex_sha256 ( $s )
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   245
	{
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   246
		return $this->binb2hex(
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   247
			$this->core_sha256(
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   248
				$this->str2binb($s),
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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				strlen($s) * $this->chrsz)
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diff changeset
   250
			);
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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diff changeset
   251
	}
1261
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	/* self-test - make sure PHP isn't screwing us over */
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	function self_test()
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	{
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		return $this->hex_sha256("message digest") == "f7846f55cf23e14eebeab5b4e1550cad5b509e3348fbc4efa3a1413d393cb650";
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	}
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	function __construct()
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	{
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		if ( !$this->self_test() )
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			die("SHA256 self test failed.<br />
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				 Please update PHP to v5.1.2 or later, which includes sha256 support built in. Nothing we can do, your platform likely does not support 32-bit unsigned integers in PHP.");
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
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	}
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}
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   266
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
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if ( !function_exists('sha256') && function_exists('hash') )
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{
beb0da036222 DiffieHellman: gracefully handle platforms that fail the sha256 self test, currently only known to be PowerPC. Added support for PHP's built-in hash functions (they were added in 5.1.2) and use them in lieu of the built-in sha256 implementation when available.
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	if ( in_array('sha256', hash_algos()) )
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	{
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		// PHP >= 5.1.2 hash support
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		function sha256($text)
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		{
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			return hash('sha256', $text);
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		}
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	}
436
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
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}
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if ( !function_exists('sha256') )
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{
1227
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	function sha256($text)
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	{
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		static $sha_obj = false;
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		if ( !is_object($sha_obj) )
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			$sha_obj = new SHA256();
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		return $sha_obj->hex_sha256($text);
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	}
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}
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?>