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Edit File: Common.php

<?php
// +-----------------------------------------------------------------------+
// | Copyright (c) 2002-2003 Richard Heyes                                 |
// | All rights reserved.                                                  |
// |                                                                       |
// | Redistribution and use in source and binary forms, with or without    |
// | modification, are permitted provided that the following conditions    |
// | are met:                                                              |
// |                                                                       |
// | o Redistributions of source code must retain the above copyright      |
// |   notice, this list of conditions and the following disclaimer.       |
// | o Redistributions in binary form must reproduce the above copyright   |
// |   notice, this list of conditions and the following disclaimer in the |
// |   documentation and/or other materials provided with the distribution.|
// | o The names of the authors may not be used to endorse or promote      |
// |   products derived from this software without specific prior written  |
// |   permission.                                                         |
// |                                                                       |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT     |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
// | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT  |
// | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
// | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT      |
// | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT   |
// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
// | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  |
// |                                                                       |
// +-----------------------------------------------------------------------+
// | Author: Richard Heyes <richard@php.net>                               |
// +-----------------------------------------------------------------------+
//
// $Id$

/**
* Common functionality to SASL mechanisms
*
* @author  Richard Heyes <richard@php.net>
* @access  public
* @version 1.0
* @package Auth_SASL
*/

class Auth_SASL_Common
{
    /**
    * Function which implements HMAC MD5 digest
    *
    * @param  string $key  The secret key
    * @param  string $data The data to hash
    * @param  bool $raw_output Whether the digest is returned in binary or hexadecimal format.
    *
    * @return string       The HMAC-MD5 digest
    */
    function _HMAC_MD5($key, $data, $raw_output = FALSE)
    {
        if (strlen($key) > 64) {
            $key = pack('H32', md5($key));
        }

if (strlen($key) < 64) {
            $key = str_pad($key, 64, chr(0));
        }

$k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
        $k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);

$inner  = pack('H32', md5($k_ipad . $data));
        $digest = md5($k_opad . $inner, $raw_output);

return $digest;
    }

/**
    * Function which implements HMAC-SHA-1 digest
    *
    * @param  string $key  The secret key
    * @param  string $data The data to hash
    * @param  bool $raw_output Whether the digest is returned in binary or hexadecimal format.
    * @return string       The HMAC-SHA-1 digest
    * @author Jehan <jehan.marmottard@gmail.com>
    * @access protected
    */
    protected function _HMAC_SHA1($key, $data, $raw_output = FALSE)
    {
        if (strlen($key) > 64) {
            $key = sha1($key, TRUE);
        }

if (strlen($key) < 64) {
            $key = str_pad($key, 64, chr(0));
        }

$k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
        $k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);

$inner  = pack('H40', sha1($k_ipad . $data));
        $digest = sha1($k_opad . $inner, $raw_output);

return $digest;
     }
}
?>