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<?php
/**
*
* dovecot_hmacmd5.php V1.01
*
* Generates HMAC-MD5 'contexts' for Dovecot's password files.
*
* (C) 2008 Hajo Noerenberg
*
* http://www.noerenberg.de/hajo/pub/dovecot_hmacmd5.php.txt
*
* Most of the code has been shamelessly stolen from various sources:
*
* (C) Paul Johnston 1999 - 2000 / http://pajhome.org.uk/crypt/md5/
* (C) William K. Cole 2008 / http://www.scconsult.com/bill/crampass.pl
* (C) Borfast 2002 / http://www.zend.com/code/codex.php?ozid=962&single=1
* (C) Thomas Weber / http://pajhome.org.uk/crypt/md5/contrib/md5.java.txt
*
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3.0 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/gpl-3.0.txt>.
*
*/
/* Convert a 32-bit number to a hex string with ls-byte first
*/
function rhex($n) {
$hex_chr = "0123456789abcdef"; $r = '';
for($j = 0; $j <= 3; $j++)
$r .= $hex_chr[($n >> ($j * 8 + 4)) & 0x0F] . $hex_chr[($n >> ($j * 8)) & 0x0F];
return $r;
}
/* zeroFill() is needed because PHP doesn't have a zero-fill
* right shift operator like JavaScript's >>>
*/
function zeroFill($a, $b) {
$z = hexdec(80000000);
if ($z & $a) {
$a >>= 1;
$a &= (~$z);
$a |= 0x40000000;
$a >>= ($b-1);
} else {
$a >>= $b;
}
return $a;
}
/* Bitwise rotate a 32-bit number to the left
*/
function bit_rol($num, $cnt) {
return ($num << $cnt) | (zeroFill($num, (32 - $cnt)));
}
/* Add integers, wrapping at 2^32
*/
function safe_add($x, $y) {
return (($x&0x7FFFFFFF) + ($y&0x7FFFFFFF)) ^ ($x&0x80000000) ^ ($y&0x80000000);
}
/* These functions implement the four basic operations the algorithm uses.
*/
function md5_cmn($q, $a, $b, $x, $s, $t) {
return safe_add(bit_rol(safe_add(safe_add($a, $q), safe_add($x, $t)), $s), $b);
}
function md5_ff($a, $b, $c, $d, $x, $s, $t) {
return md5_cmn(($b & $c) | ((~$b) & $d), $a, $b, $x, $s, $t);
}
function md5_gg($a, $b, $c, $d, $x, $s, $t) {
return md5_cmn(($b & $d) | ($c & (~$d)), $a, $b, $x, $s, $t);
}
function md5_hh($a, $b, $c, $d, $x, $s, $t) {
return md5_cmn($b ^ $c ^ $d, $a, $b, $x, $s, $t);
}
function md5_ii($a, $b, $c, $d, $x, $s, $t) {
return md5_cmn($c ^ ($b | (~$d)), $a, $b, $x, $s, $t);
}
/* Calculate the first round of the MD5 algorithm
*/
function md5_oneround($s, $io) {
$s = str_pad($s, 64, chr(0x00));
$x = array_fill(0, 16, 0);
for($i = 0; $i < 64; $i++)
$x[$i >> 2] |= (($io ? 0x36 : 0x5c) ^ ord($s[$i])) << (($i % 4) * 8);
$a = $olda = 1732584193;
$b = $oldb = -271733879;
$c = $oldc = -1732584194;
$d = $oldd = 271733878;
$a = md5_ff($a, $b, $c, $d, $x[ 0], 7 , -680876936);
$d = md5_ff($d, $a, $b, $c, $x[ 1], 12, -389564586);
$c = md5_ff($c, $d, $a, $b, $x[ 2], 17, 606105819);
$b = md5_ff($b, $c, $d, $a, $x[ 3], 22, -1044525330);
$a = md5_ff($a, $b, $c, $d, $x[ 4], 7 , -176418897);
$d = md5_ff($d, $a, $b, $c, $x[ 5], 12, 1200080426);
$c = md5_ff($c, $d, $a, $b, $x[ 6], 17, -1473231341);
$b = md5_ff($b, $c, $d, $a, $x[ 7], 22, -45705983);
$a = md5_ff($a, $b, $c, $d, $x[ 8], 7 , 1770035416);
$d = md5_ff($d, $a, $b, $c, $x[ 9], 12, -1958414417);
$c = md5_ff($c, $d, $a, $b, $x[10], 17, -42063);
$b = md5_ff($b, $c, $d, $a, $x[11], 22, -1990404162);
$a = md5_ff($a, $b, $c, $d, $x[12], 7 , 1804603682);
$d = md5_ff($d, $a, $b, $c, $x[13], 12, -40341101);
$c = md5_ff($c, $d, $a, $b, $x[14], 17, -1502002290);
$b = md5_ff($b, $c, $d, $a, $x[15], 22, 1236535329);
$a = md5_gg($a, $b, $c, $d, $x[ 1], 5 , -165796510);
$d = md5_gg($d, $a, $b, $c, $x[ 6], 9 , -1069501632);
$c = md5_gg($c, $d, $a, $b, $x[11], 14, 643717713);
$b = md5_gg($b, $c, $d, $a, $x[ 0], 20, -373897302);
$a = md5_gg($a, $b, $c, $d, $x[ 5], 5 , -701558691);
$d = md5_gg($d, $a, $b, $c, $x[10], 9 , 38016083);
$c = md5_gg($c, $d, $a, $b, $x[15], 14, -660478335);
$b = md5_gg($b, $c, $d, $a, $x[ 4], 20, -405537848);
$a = md5_gg($a, $b, $c, $d, $x[ 9], 5 , 568446438);
$d = md5_gg($d, $a, $b, $c, $x[14], 9 , -1019803690);
$c = md5_gg($c, $d, $a, $b, $x[ 3], 14, -187363961);
$b = md5_gg($b, $c, $d, $a, $x[ 8], 20, 1163531501);
$a = md5_gg($a, $b, $c, $d, $x[13], 5 , -1444681467);
$d = md5_gg($d, $a, $b, $c, $x[ 2], 9 , -51403784);
$c = md5_gg($c, $d, $a, $b, $x[ 7], 14, 1735328473);
$b = md5_gg($b, $c, $d, $a, $x[12], 20, -1926607734);
$a = md5_hh($a, $b, $c, $d, $x[ 5], 4 , -378558);
$d = md5_hh($d, $a, $b, $c, $x[ 8], 11, -2022574463);
$c = md5_hh($c, $d, $a, $b, $x[11], 16, 1839030562);
$b = md5_hh($b, $c, $d, $a, $x[14], 23, -35309556);
$a = md5_hh($a, $b, $c, $d, $x[ 1], 4 , -1530992060);
$d = md5_hh($d, $a, $b, $c, $x[ 4], 11, 1272893353);
$c = md5_hh($c, $d, $a, $b, $x[ 7], 16, -155497632);
$b = md5_hh($b, $c, $d, $a, $x[10], 23, -1094730640);
$a = md5_hh($a, $b, $c, $d, $x[13], 4 , 681279174);
$d = md5_hh($d, $a, $b, $c, $x[ 0], 11, -358537222);
$c = md5_hh($c, $d, $a, $b, $x[ 3], 16, -722521979);
$b = md5_hh($b, $c, $d, $a, $x[ 6], 23, 76029189);
$a = md5_hh($a, $b, $c, $d, $x[ 9], 4 , -640364487);
$d = md5_hh($d, $a, $b, $c, $x[12], 11, -421815835);
$c = md5_hh($c, $d, $a, $b, $x[15], 16, 530742520);
$b = md5_hh($b, $c, $d, $a, $x[ 2], 23, -995338651);
$a = md5_ii($a, $b, $c, $d, $x[ 0], 6 , -198630844);
$d = md5_ii($d, $a, $b, $c, $x[ 7], 10, 1126891415);
$c = md5_ii($c, $d, $a, $b, $x[14], 15, -1416354905);
$b = md5_ii($b, $c, $d, $a, $x[ 5], 21, -57434055);
$a = md5_ii($a, $b, $c, $d, $x[12], 6 , 1700485571);
$d = md5_ii($d, $a, $b, $c, $x[ 3], 10, -1894986606);
$c = md5_ii($c, $d, $a, $b, $x[10], 15, -1051523);
$b = md5_ii($b, $c, $d, $a, $x[ 1], 21, -2054922799);
$a = md5_ii($a, $b, $c, $d, $x[ 8], 6 , 1873313359);
$d = md5_ii($d, $a, $b, $c, $x[15], 10, -30611744);
$c = md5_ii($c, $d, $a, $b, $x[ 6], 15, -1560198380);
$b = md5_ii($b, $c, $d, $a, $x[13], 21, 1309151649);
$a = md5_ii($a, $b, $c, $d, $x[ 4], 6 , -145523070);
$d = md5_ii($d, $a, $b, $c, $x[11], 10, -1120210379);
$c = md5_ii($c, $d, $a, $b, $x[ 2], 15, 718787259);
$b = md5_ii($b, $c, $d, $a, $x[ 9], 21, -343485551);
$a = safe_add($a, $olda);
$b = safe_add($b, $oldb);
$c = safe_add($c, $oldc);
$d = safe_add($d, $oldd);
return rhex($a) . rhex($b) . rhex($c) . rhex($d);
}
function dovecot_hmacmd5 ($s) {
if (strlen($s) > 64) $s=pack("H*", md5($s));
return "{CRAM-MD5}" . md5_oneround($s, 0) . md5_oneround($s, 1);
}
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