C:/xampp/htdocs/moodle/lib/pear/Crypt/CHAP.php

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<?php
/*
Copyright (c) 2002-2003, Michael Bretterklieber <michael@bretterklieber.com>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. 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.
3. 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.

This code cannot simply be copied and put under the GNU Public License or
any other GPL-like (LGPL, GPL2) License.

    $Id: CHAP.php,v 1.2 2010/12/14 17:36:04 moodlerobot Exp $
*/

require_once 'PEAR.php';

class Crypt_CHAP extends PEAR
{
    var $challenge = null;

    var $response = null;

    var $password = null;

    var $chapid = 1;

    function Crypt_CHAP()
    {
        $this->PEAR();
        $this->generateChallenge();
    }

    function generateChallenge($varname = 'challenge', $size = 8)
    {
        $this->$varname = '';
        mt_srand(hexdec(substr(md5(microtime()), -8)) & 0x7fffffff);
        for ($i = 0; $i < $size; $i++) {
            $this->$varname .= pack('C', 1 + mt_rand() % 255);
        }
        return $this->$varname;
    }

    function challengeResponse()
    {
    }

}

class Crypt_CHAP_MD5 extends Crypt_CHAP
{

    function challengeResponse()
    {
        return pack('H*', md5(pack('C', $this->chapid) . $this->password . $this->challenge));
    }
}

class Crypt_CHAP_MSv1 extends Crypt_CHAP
{
    var $flags = 1;

    function Crypt_CHAP_MSv1()
    {
        $this->Crypt_CHAP();
        $this->loadExtension('mhash');
    }

    function ntPasswordHash($password = null)
    {
        if (isset($password)) {
            return mhash(MHASH_MD4, $this->str2unicode($password));
        } else {
            return mhash(MHASH_MD4, $this->str2unicode($this->password));
        }
    }

    function str2unicode($str)
    {
        $uni = '';
        $str = (string) $str;
        for ($i = 0; $i < strlen($str); $i++) {
            $a = ord($str{$i}) << 8;
            $uni .= sprintf("%X", $a);
        }
        return pack('H*', $uni);
    }

    function challengeResponse()
    {
        return $this->_challengeResponse();
    }

    function ntChallengeResponse()
    {
        return $this->_challengeResponse(false);
    }

    function lmChallengeResponse()
    {
        return $this->_challengeResponse(true);
    }

    function _challengeResponse($lm = false)
    {
        if ($lm) {
            $hash = $this->lmPasswordHash();
        } else {
            $hash = $this->ntPasswordHash();
        }

        while (strlen($hash) < 21) {
            $hash .= "\0";
        }

        $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        $key = $this->_desAddParity(substr($hash, 0, 7));
        mcrypt_generic_init($td, $key, $iv);
        $resp1 = mcrypt_generic($td, $this->challenge);
        mcrypt_generic_deinit($td);

        $key = $this->_desAddParity(substr($hash, 7, 7));
        mcrypt_generic_init($td, $key, $iv);
        $resp2 = mcrypt_generic($td, $this->challenge);
        mcrypt_generic_deinit($td);

        $key = $this->_desAddParity(substr($hash, 14, 7));
        mcrypt_generic_init($td, $key, $iv);
        $resp3 = mcrypt_generic($td, $this->challenge);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);

        return $resp1 . $resp2 . $resp3;
    }

    function lmPasswordHash($password = null)
    {
        $plain = isset($password) ? $password : $this->password;

        $plain = substr(strtoupper($plain), 0, 14);
        while (strlen($plain) < 14) {
             $plain .= "\0";
        }

        return $this->_desHash(substr($plain, 0, 7)) . $this->_desHash(substr($plain, 7, 7));
    }

    function _desHash($plain)
    {
        $key = $this->_desAddParity($plain);
        $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        mcrypt_generic_init($td, $key, $iv);
        $hash = mcrypt_generic($td, 'KGS!@#$%');
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return $hash;
    }

    function _desAddParity($key)
    {
        static $odd_parity = array(
                1,  1,  2,  2,  4,  4,  7,  7,  8,  8, 11, 11, 13, 13, 14, 14,
                16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
                32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
                49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
                64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
                81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
                97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
                112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
                128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
                145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
                161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
                176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
                193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
                208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
                224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
                241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254);

        $bin = '';
        for ($i = 0; $i < strlen($key); $i++) {
            $bin .= sprintf('%08s', decbin(ord($key{$i})));
        }

        $str1 = explode('-', substr(chunk_split($bin, 7, '-'), 0, -1));
        $x = '';
        foreach($str1 as $s) {
            $x .= sprintf('%02s', dechex($odd_parity[bindec($s . '0')]));
        }

        return pack('H*', $x);

    }

    function response($lm = false)
    {
        $ntresp = $this->ntChallengeResponse();
        if ($lm) {
            $lmresp = $this->lmChallengeResponse();
        } else {
            $lmresp = str_repeat ("\0", 24);
        }

        // Response: LM Response, NT Response, flags (0 = use LM Response, 1 = use NT Response)
        return $lmresp . $ntresp . pack('C', !$lm);
    }
}

class Crypt_CHAP_MSv2 extends Crypt_CHAP_MSv1
{
    var $username = null;

    var $peerChallenge = null;

    var $authChallenge = null;

    function Crypt_CHAP_MSv2()
    {
        $this->Crypt_CHAP_MSv1();
        $this->generateChallenge('peerChallenge', 16);
        $this->generateChallenge('authChallenge', 16);
    }

    function ntPasswordHashHash($nthash)
    {
        return mhash(MHASH_MD4, $nthash);
    }

    function challengeHash()
    {
        return substr(mhash(MHASH_SHA1, $this->peerChallenge . $this->authChallenge . $this->username), 0, 8);
    }

    function challengeResponse()
    {
        $this->challenge = $this->challengeHash();
        return $this->_challengeResponse();
    }
}


?>