2 // +-----------------------------------------------------------------------+
3 // | Copyright (c) 2002-2003 Richard Heyes |
4 // | All rights reserved. |
6 // | Redistribution and use in source and binary forms, with or without |
7 // | modification, are permitted provided that the following conditions |
10 // | o Redistributions of source code must retain the above copyright |
11 // | notice, this list of conditions and the following disclaimer. |
12 // | o Redistributions in binary form must reproduce the above copyright |
13 // | notice, this list of conditions and the following disclaimer in the |
14 // | documentation and/or other materials provided with the distribution.|
15 // | o The names of the authors may not be used to endorse or promote |
16 // | products derived from this software without specific prior written |
19 // | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
20 // | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
21 // | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
22 // | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
23 // | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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25 // | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
26 // | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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29 // | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
31 // +-----------------------------------------------------------------------+
32 // | Author: Richard Heyes <richard@php.net> |
33 // +-----------------------------------------------------------------------+
35 // $Id: Common.php 286825 2009-08-05 06:23:42Z cweiske $
38 * Common functionality to SASL mechanisms
40 * @author Richard Heyes <richard@php.net>
46 class Auth_SASL_Common
49 * Function which implements HMAC MD5 digest
51 * @param string $key The secret key
52 * @param string $data The data to protect
53 * @return string The HMAC MD5 digest
55 function _HMAC_MD5($key, $data)
57 if (strlen($key) > 64) {
58 $key = pack('H32', md5($key));
61 if (strlen($key) < 64) {
62 $key = str_pad($key, 64, chr(0));
65 $k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
66 $k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);
68 $inner = pack('H32', md5($k_ipad . $data));
69 $digest = md5($k_opad . $inner);