# 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 ?>