diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 540562c7..2911c070 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -80,7 +80,7 @@ define('NET_SSH2_MASK_CONNECTED',     0x00000002);
 define('NET_SSH2_MASK_LOGIN_REQ',     0x00000004);
 define('NET_SSH2_MASK_LOGIN',         0x00000008);
 define('NET_SSH2_MASK_SHELL',         0x00000010);
-define('NET_SSH2_MASK_WINDOW_ADJUST', 0X00000020);
+define('NET_SSH2_MASK_WINDOW_ADJUST', 0x00000020);
 /**#@-*/
 
 /**#@+
@@ -3766,8 +3766,9 @@ class Net_SSH2
                 $e = new BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
 
                 $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
-                $n = new BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
-                $nLength = $temp['length'];
+                $rawN = $this->_string_shift($server_public_host_key, $temp['length']);
+                $n = new BigInteger($rawN, -256);
+                $nLength = strlen(ltrim($rawN, "\0"));
 
                 /*
                 $temp = unpack('Nlength', $this->_string_shift($signature, 4));
@@ -3804,7 +3805,7 @@ class Net_SSH2
                 $s = $s->toBytes();
 
                 $h = pack('N4H*', 0x00302130, 0x0906052B, 0x0E03021A, 0x05000414, sha1($this->exchange_hash));
-                $h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 3 - strlen($h)) . $h;
+                $h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 2 - strlen($h)) . $h;
 
                 if ($s != $h) {
                     user_error('Bad server signature');