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<?php
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// +-----------------------------------------------------------------------+
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// | Copyright (c) 2002-2003 Richard Heyes |
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// | All rights reserved. |
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// | |
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// | Redistribution and use in source and binary forms, with or without |
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// | modification, are permitted provided that the following conditions |
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// | are met: |
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// | |
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// | o Redistributions of source code must retain the above copyright |
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// | notice, this list of conditions and the following disclaimer. |
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// | o Redistributions in binary form must reproduce the above copyright |
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// | notice, this list of conditions and the following disclaimer in the |
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// | documentation and/or other materials provided with the distribution.|
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// | o The names of the authors may not be used to endorse or promote |
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// | products derived from this software without specific prior written |
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// | permission. |
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// | |
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// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// | |
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// +-----------------------------------------------------------------------+
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// | Author: Richard Heyes <richard@php.net> |
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// +-----------------------------------------------------------------------+
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//
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// $Id: Common.php,v 1.6 2003/02/21 16:07:17 mj Exp $
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/**
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* Common functionality to SASL mechanisms
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*
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* @author Richard Heyes <richard@php.net>
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* @access public
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* @version 1.0
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* @package Auth_SASL
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*/
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class Auth_SASL_Common
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{
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/**
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* Function which implements HMAC MD5 digest
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*
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* @param string $key The secret key
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* @param string $data The data to protect
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* @return string The HMAC MD5 digest
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*/
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function _HMAC_MD5($key, $data)
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{
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if (strlen($key) > 64) {
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$key = pack('H32', md5($key));
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}
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if (strlen($key) < 64) {
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$key = str_pad($key, 64, chr(0));
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}
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$k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
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$k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);
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$inner = pack('H32', md5($k_ipad . $data));
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$digest = md5($k_opad . $inner);
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return $digest;
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}
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}
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?>
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