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42 aurelien 1 
<?php
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/**
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 * This is the HMACSHA1 implementation for the OpenID library.
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 *
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 * PHP versions 4 and 5
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 *
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 * LICENSE: See the COPYING file included in this distribution.
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 *
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 * @access private
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 * @package OpenID
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 * @author JanRain, Inc. <openid@janrain.com>
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 * @copyright 2005 Janrain, Inc.
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 * @license http://www.gnu.org/copyleft/lesser.html LGPL
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 */
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/**
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 * SHA1_BLOCKSIZE is this module's SHA1 blocksize used by the fallback
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 * implementation.
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 */
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define('Auth_OpenID_SHA1_BLOCKSIZE', 64);
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if (!function_exists('sha1')) {
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    /**
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     * Return a raw SHA1 hash of the given string
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     *
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     * XXX: include the SHA1 code from Dan Libby's OpenID library
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     */
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    function Auth_OpenID_SHA1($text)
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    {
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        trigger_error('No SHA1 function found', E_USER_ERROR);
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    }
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} else {
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    /**
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     * @ignore
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     */
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    function Auth_OpenID_SHA1($text)
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        {
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            $hex = sha1($text);
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            $raw = '';
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            for ($i = 0; $i < 40; $i += 2) {
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                $hexcode = substr($hex, $i, 2);
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                $charcode = (int)base_convert($hexcode, 16, 10);
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                $raw .= chr($charcode);
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            }
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            return $raw;
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        }
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}
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/**
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 * Compute an HMAC/SHA1 hash.
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 *
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 * @access private
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 * @param string $key The HMAC key
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 * @param string $text The message text to hash
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 * @return string $mac The MAC
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 */
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function Auth_OpenID_HMACSHA1($key, $text)
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{
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    if (strlen($key) > Auth_OpenID_SHA1_BLOCKSIZE) {
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        $key = Auth_OpenID_SHA1($key, true);
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    }
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    $key = str_pad($key, Auth_OpenID_SHA1_BLOCKSIZE, chr(0x00));
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    $ipad = str_repeat(chr(0x36), Auth_OpenID_SHA1_BLOCKSIZE);
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    $opad = str_repeat(chr(0x5c), Auth_OpenID_SHA1_BLOCKSIZE);
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    $hash1 = Auth_OpenID_SHA1(($key ^ $ipad) . $text, true);
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    $hmac = Auth_OpenID_SHA1(($key ^ $opad) . $hash1, true);
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    return $hmac;
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}
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?>