includes/diffiehellman.php
author Dan
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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($X, $n)
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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 & $X) 
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    { 
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        $X = ($X>>1); 
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        $X &= (~$z); 
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        $X |= 0x40000000; 
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        $X = ($X>>($n-1)); 
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    } 
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    else 
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    { 
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        $X = ($X>>$n); 
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    } 
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    return $X; 
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  }
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  function S ($X, $n) {return ( $this->rshz($X, $n) ) | ($X << (32 - $n));}
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  function R ($X, $n) {return ( $this->rshz($X, $n) );}
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  function Ch($x, $y, $z)  {return (($x & $y) ^ ((~$x) & $z));}
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  function Maj($x, $y, $z) {return (($x & $y) ^ ($x & $z) ^ ($y & $z));}
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  function Sigma0256($x) {return ($this->S($x, 2)  ^ $this->S($x, 13) ^ $this->S($x, 22));}
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  function Sigma1256($x) {return ($this->S($x, 6)  ^ $this->S($x, 11) ^ $this->S($x, 25));}
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  function Gamma0256($x) {return ($this->S($x, 7)  ^ $this->S($x, 18) ^ $this->R($x, 3));}
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  function Gamma1256($x) {return ($this->S($x, 17) ^ $this->S($x, 19) ^ $this->R($x, 10));}
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  function core_sha256 ($m, $l) {
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      $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);
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      $HASH = Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);
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      $W = Array(64);
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      /* append padding */
1080
6358f769ecb1 Minor fix to SHA256: some indices were not being initted under some circumstances
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      if ( !isset($m[$l >> 5]) )
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        $m[$l >> 5] = 0;
436
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      $m[$l >> 5] |= 0x80 << (24 - $l % 32);
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      $m[(($l + 64 >> 9) << 4) + 15] = $l;
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      for ( $i = 0; $i<count($m); $i+=16 ) {
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          $a = $HASH[0];
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          $b = $HASH[1];
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          $c = $HASH[2];
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          $d = $HASH[3];
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          $e = $HASH[4];
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          $f = $HASH[5];
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          $g = $HASH[6];
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          $h = $HASH[7];
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          for ( $j = 0; $j<64; $j++)
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          {
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              if ( $j < 16 )
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              {
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                $W[$j] = ( isset($m[$j + $i]) ) ? $m[$j + $i] : 0;
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              }
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              else
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              {
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                $W[$j] = $this->safe_add(
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                  $this->safe_add(
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                    $this->safe_add(
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                      $this->Gamma1256($W[$j - 2]), $W[$j - 7]),
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                    $this->Gamma0256($W[$j - 15])),
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                  $W[$j - 16]);
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              }
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              $T1 = $this->safe_add(
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                $this->safe_add(
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                  $this->safe_add(
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                    $this->safe_add($h, $this->Sigma1256($e)
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                      ),
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                    $this->Ch($e, $f, $g)),
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                  $K[$j]),
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                $W[$j]);
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              $T2 = $this->safe_add($this->Sigma0256($a), $this->Maj($a, $b, $c));
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              $h = $g;
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              $g = $f;
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              $f = $e;
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              $e = $this->safe_add($d, $T1);
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              $d = $c;
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              $c = $b;
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              $b = $a;
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              $a = $this->safe_add($T1, $T2);
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          }
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          $HASH[0] = $this->safe_add($a, $HASH[0]);
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          $HASH[1] = $this->safe_add($b, $HASH[1]);
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          $HASH[2] = $this->safe_add($c, $HASH[2]);
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          $HASH[3] = $this->safe_add($d, $HASH[3]);
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          $HASH[4] = $this->safe_add($e, $HASH[4]);
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          $HASH[5] = $this->safe_add($f, $HASH[5]);
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          $HASH[6] = $this->safe_add($g, $HASH[6]);
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          $HASH[7] = $this->safe_add($h, $HASH[7]);
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      }
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      return $HASH;
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  }
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  function str2binb ($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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      }
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      else
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      {
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        $bin[$block] <<= 8;
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        $bin[$block] |= $byte;
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      }
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    }
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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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    }
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    return $bin;
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  }
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  function byte2hex($byte)
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  {
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    $b = dechex(ord($byte));
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    return ( strlen($b) < 2 ) ? "0$b" : $b;
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   228
  }
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  function binb2hex ($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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    foreach ( $binarray as $bytes )
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   234
    {
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   235
      $str .= implode('', array(
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          $this->byte2hex(chr(( $bytes >> 24 ) & 0xFF)),
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          $this->byte2hex(chr(( $bytes >> 16 ) & 0xFF)),
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          $this->byte2hex(chr(( $bytes >> 8 ) & 0xFF)),
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   239
          $this->byte2hex(chr($bytes & 0xFF))
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   240
        ));
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   241
    }
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    return $str;
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   243
  }
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  function hex_sha256 ( $s )
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  {
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   246
    return $this->binb2hex(
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   247
      $this->core_sha256(
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        $this->str2binb($s),
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        strlen($s) * $this->chrsz)
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      );
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   251
  }
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}
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   253
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if ( !function_exists('sha256') )
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{
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   256
  function sha256($text)
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   257
  {
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    static $sha_obj = false;
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   259
    if ( !is_object($sha_obj) )
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   260
      $sha_obj = new SHA256();
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   261
    return $sha_obj->hex_sha256($text);
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   262
  }
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   263
}
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?>