--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/password/helpers/dovecot_hmacmd5.php	Thu Jan 04 15:50:29 2018 -0500
@@ -0,0 +1,191 @@
+<?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 md5_oneround($s, 0) . md5_oneround($s, 1);
+}