CryptoFunctions.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2007 by Anton E. Lebedevich                             *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 
00015     final class CryptoFunctions extends StaticFactory
00016     {
00017         const SHA1_BLOCK_SIZE = 64;
00018         
00022         public static function hmacsha1($key, $message)
00023         {
00024             if (strlen($key) > self::SHA1_BLOCK_SIZE)
00025                 $key = sha1($key, true);
00026             
00027             $key = str_pad($key, self::SHA1_BLOCK_SIZE, "\x00", STR_PAD_RIGHT);
00028             
00029             $ipad = null;
00030             $opad = null;
00031             for ($i = 0; $i < self::SHA1_BLOCK_SIZE; $i++) {
00032                 $ipad .= "\x36" ^ $key[$i];
00033                 $opad .= "\x5c" ^ $key[$i];
00034             }
00035             
00036             return sha1($opad.sha1($ipad.$message, true), true);
00037         }
00038     }
00039 ?>