includes/hmac.php
author Dan
Sun, 11 Jan 2009 21:32:24 -0500
changeset 805 b2dc28b9f367
parent 801 eb8b23f11744
child 841 83bb60402f51
permissions -rw-r--r--
Fix undefined variable in special namespace missing function handler
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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eb8b23f11744 Two big commits in one day I know, but redid password storage to use HMAC-SHA1. Consolidated much AES processing to three core methods in session that should handle everything automagically. Installation works; upgrades should. Rebranded as 1.1.6.
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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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 * Version 1.1.6 (Caoineag beta 1)
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 * Copyright (C) 2006-2008 Dan Fuhry
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 * hmac.php - HMAC cryptographic 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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function hmac_gen_padding($val, $len = 32)
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{
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  $ret = array();
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  for ( $i = 0; $i < $len; $i++ )
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  {
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    $ret[] = $val;
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  }
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  return $ret;
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}
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function hmac_core($message, $key, $hashfunc)
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{
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  static $block_sizes = array();
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  if ( !isset($block_sizes[$hashfunc]) )
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  {
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    $block_sizes[$hashfunc] = strlen($hashfunc(''))/2;
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  }
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  $blocksize = $block_sizes[$hashfunc];
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  $ipad = hmac_gen_padding(0x5c, $blocksize);
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  $opad = hmac_gen_padding(0x36, $blocksize);
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  if ( strlen($key) != ( $blocksize * 2 ) )
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    $key = $hashfunc($key);
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  $key = hmac_hexbytearray($key);
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  for ( $i = 0; $i < count($key); $i++ )
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  {
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    $ipad[$i] = $ipad[$i] ^ $key[$i];
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    $opad[$i] = $opad[$i] ^ $key[$i];
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  }
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  return $hashfunc(hmac_bytearraytostring($opad) . $hashfunc(hmac_bytearraytostring($ipad) . $message));
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}
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function hmac_hexbytearray($val)
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{
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  $val = hexdecode($val);
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  return hmac_bytearray($val);
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}
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function hmac_bytearray($val)
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{
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  $val = str_split($val, 1);
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  foreach ( $val as &$char )
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  {
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    $char = ord($char);
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  }
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  return $val;
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}
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function hmac_bytearraytostring($val)
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{
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  foreach ( $val as &$char )
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  {
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    $char = chr($char);
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  }
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  return implode('', $val);
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}
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function hmac_md5($message, $key)
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{
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  return hmac_core($message, $key, 'md5');
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}
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function hmac_sha1($message, $key)
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{
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  return hmac_core($message, $key, 'sha1');
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}
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function hmac_sha256($message, $key)
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{
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  require_once(ENANO_ROOT . '/includes/math.php');
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  require_once(ENANO_ROOT . '/includes/diffiehellman.php');
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  return hmac_core($message, $key, 'sha256');
eb8b23f11744 Two big commits in one day I know, but redid password storage to use HMAC-SHA1. Consolidated much AES processing to three core methods in session that should handle everything automagically. Installation works; upgrades should. Rebranded as 1.1.6.
Dan
parents:
diff changeset
    87
}
eb8b23f11744 Two big commits in one day I know, but redid password storage to use HMAC-SHA1. Consolidated much AES processing to three core methods in session that should handle everything automagically. Installation works; upgrades should. Rebranded as 1.1.6.
Dan
parents:
diff changeset
    88
eb8b23f11744 Two big commits in one day I know, but redid password storage to use HMAC-SHA1. Consolidated much AES processing to three core methods in session that should handle everything automagically. Installation works; upgrades should. Rebranded as 1.1.6.
Dan
parents:
diff changeset
    89
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