includes/hmac.php
author Dan
Tue, 03 Nov 2009 22:08:48 -0500
changeset 1132 05fe0039d952
parent 1081 745200a9cc2a
child 1227 bdac73ed481e
permissions -rw-r--r--
Logins: reorganized data structures a bit. WiP - needs test routine done.
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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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 * 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_core($message, $key, $hashfunc)
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{
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  if ( strlen($key) % 2 == 1 )
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    $key .= '0';
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  if ( strlen($key) > 128 )
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    $key = $hashfunc($key);
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  while ( strlen($key) < 128 )
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  {
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    $key .= '00';
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  }
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  $opad = hmac_hexbytearray($key);
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  $ipad = $opad;
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  for ( $i = 0; $i < count($ipad); $i++ )
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  {
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    $opad[$i] = $opad[$i] ^ 0x5c;
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    $ipad[$i] = $ipad[$i] ^ 0x36;
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  }
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  $opad = hmac_bytearraytostring($opad);
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  $ipad = hmac_bytearraytostring($ipad);
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  return $hashfunc($opad . hexdecode($hashfunc($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');
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}
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?>