diff --git a/appinfo/info.xml b/appinfo/info.xml
index fd74bdd..576c4a8 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -4,7 +4,7 @@
        <name>SQL user backend</name>
        <summary>Authenticate Users by SQL</summary>
        <description>Authenticate Users by SQL</description>
-       <version>2.3.1</version>
+       <version>2.3.2</version>
        <licence>agpl</licence>
        <author>Andreas Boehler &lt;dev (at) aboehler 
 (dot) at &gt;</author>
diff --git a/dovecot_hmacmd5.php b/dovecot_hmacmd5.php
new file mode 100644
index 0000000..74c9739
--- /dev/null
+++ b/dovecot_hmacmd5.php
@@ -0,0 +1,198 @@
+<?php
+
+/**
+ *
+ * dovecot_hmacmd5.php V1.01
+ *
+ * Generates HMAC-MD5 'contexts' for Dovecot's password files.
+ * Adapted for user_sql by Andreas Boehler
+ *
+ * (C) 2008 Hajo Noerenberg
+ *
+ * http://www.noerenberg.de/
+ * https://github.com/hn/dovecot-misc
+ *
+ * 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) {
+    $hex_chr = "0123456789abcdef";
+    for($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 "{HMAC-MD5}" . md5_oneround($s, 0) . md5_oneround($s, 1);
+}
+
+function dovecot_crammd5 ($s) {
+    if (strlen($s) > 64) $s=pack("H*", md5($s));
+    return "{CRAM-MD5}" . md5_oneround($s, 0) . md5_oneround($s, 1);
+}
diff --git a/templates/settings.php b/templates/settings.php
index c555c5c..8bac344 100644
--- a/templates/settings.php
+++ b/templates/settings.php
@@ -66,7 +66,7 @@ $cfgClass = $ocVersion >= 7 ? 'section' : 'personalblock';
             <p><label for="col_displayname"><?php p($l -> t('Real Name Column')); ?></label><input type="text" id="col_displayname" name="col_displayname" value="<?php p($_['col_displayname']); ?>" /></p>
             
             <p><label for="set_crypt_type"><?php p($l -> t('Encryption Type')); ?></label>
-                <?php $crypt_types = array('md5' => 'MD5', 'md5crypt' => 'MD5 Crypt', 'cleartext' => 'Cleartext', 'mysql_encrypt' => 'mySQL ENCRYPT()', 'system' => 'System (crypt)', 'mysql_password' => 'mySQL PASSWORD()', 'joomla' => 'Joomla MD5 Encryption', 'joomla2' => 'Joomla > 2.5.18 phpass', 'ssha256' => 'Salted SSHA256', 'redmine' => 'Redmine'); ?>
+                <?php $crypt_types = array('md5' => 'MD5', 'md5crypt' => 'MD5 Crypt', 'cleartext' => 'Cleartext', 'mysql_encrypt' => 'mySQL ENCRYPT()', 'system' => 'System (crypt)', 'mysql_password' => 'mySQL PASSWORD()', 'joomla' => 'Joomla MD5 Encryption', 'joomla2' => 'Joomla > 2.5.18 phpass', 'ssha256' => 'Salted SSHA256', 'redmine' => 'Redmine', 'crammd5' => 'CRAM-MD5', 'hmacmd5' => 'HMAC-MD5'); ?>
                 <select id="set_crypt_type" name="set_crypt_type">
                     <?php 
                         foreach ($crypt_types as $driver => $name):
diff --git a/user_sql.php b/user_sql.php
index 9283c66..7e7fd71 100644
--- a/user_sql.php
+++ b/user_sql.php
@@ -576,6 +576,18 @@ class OC_USER_SQL extends \OC_User_Backend implements \OCP\IUserBackend, \OCP\Us
             $password .= ':' . $salt;
 		}
 
+        elseif($this-> settings['set_crypt_type'] === 'hmacmd5')
+        {
+            require_once('dovecot_hmacmd5.php');
+            $password = dovecot_hmacmd5($pw);
+        }
+        
+        elseif($this-> settings['set_crypt_type'] === 'crammd5')
+        {
+            require_once('dovecot_hmacmd5.php');
+            $password = dovecot_crammd5($pw);
+        }
+
 		elseif($this-> settings['set_crypt_type'] === 'ssha256')
 		{
 			$salted_password = base64_decode(preg_replace('/{SSHA256}/i','',$pw_db));