diff --git a/phpseclib/Crypt/AES.php b/phpseclib/Crypt/AES.php
index de60dee2..bc05adf6 100644
--- a/phpseclib/Crypt/AES.php
+++ b/phpseclib/Crypt/AES.php
@@ -868,7 +868,8 @@ class Crypt_AES extends Crypt_Rijndael {
                 $s0 = $dt0[($e0 >> 24) & 0xff] ^ $dt1[($e3 >> 16) & 0xff] ^ $dt2[($e2 >> 8) & 0xff] ^ $dt3[$e1 & 0xff] ^ $dw[52];
                 $s1 = $dt0[($e1 >> 24) & 0xff] ^ $dt1[($e0 >> 16) & 0xff] ^ $dt2[($e3 >> 8) & 0xff] ^ $dt3[$e2 & 0xff] ^ $dw[53];
                 $s2 = $dt0[($e2 >> 24) & 0xff] ^ $dt1[($e1 >> 16) & 0xff] ^ $dt2[($e0 >> 8) & 0xff] ^ $dt3[$e3 & 0xff] ^ $dw[54];
-                 $e3= $dt0[($e3 >> 24) & 0xff] ^ $dt1[($e2 >> 16) & 0xff] ^ $dt2[($e1 >> 8) & 0xff] ^ $dt3[$e0 & 0xff] ^ $dw[55];
+                $e3 = $dt0[($e3 >> 24) & 0xff] ^ $dt1[($e2 >> 16) & 0xff] ^ $dt2[($e1 >> 8) & 0xff] ^ $dt3[$e0 & 0xff] ^ $dw[55];
+                // Note: Here we skip $s3 but using $e3
 
                 $e0 = $s0;
                 $e1 = $s1;
@@ -880,7 +881,8 @@ class Crypt_AES extends Crypt_Rijndael {
                 $s0 = $dt0[($e0 >> 24) & 0xff] ^ $dt1[($e3 >> 16) & 0xff] ^ $dt2[($e2 >> 8) & 0xff] ^ $dt3[$e1 & 0xff] ^ $dw[44];
                 $s1 = $dt0[($e1 >> 24) & 0xff] ^ $dt1[($e0 >> 16) & 0xff] ^ $dt2[($e3 >> 8) & 0xff] ^ $dt3[$e2 & 0xff] ^ $dw[45];
                 $s2 = $dt0[($e2 >> 24) & 0xff] ^ $dt1[($e1 >> 16) & 0xff] ^ $dt2[($e0 >> 8) & 0xff] ^ $dt3[$e3 & 0xff] ^ $dw[46];
-                 $e3= $dt0[($e3 >> 24) & 0xff] ^ $dt1[($e2 >> 16) & 0xff] ^ $dt2[($e1 >> 8) & 0xff] ^ $dt3[$e0 & 0xff] ^ $dw[47];
+                $e3 = $dt0[($e3 >> 24) & 0xff] ^ $dt1[($e2 >> 16) & 0xff] ^ $dt2[($e1 >> 8) & 0xff] ^ $dt3[$e0 & 0xff] ^ $dw[47];
+                // Note: Here we skip $s3 but using $e3
 
                 $e0 = $s0;
                 $e1 = $s1;
diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 8a2acb20..278da62e 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -3156,8 +3156,8 @@ class File_X509 {
                 return false;
             }
 
-            $startDate = !empty($this->startDate) ? $this->startDate : @date('M j H:i:s Y T');
-            $endDate = !empty($this->endDate) ? $this->endDate : @date('M j H:i:s Y T', strtotime('+1 year'));
+            $startDate = !empty($this->startDate) ? $this->startDate : @date('D, d M y H:i:s O');
+            $endDate = !empty($this->endDate) ? $this->endDate : @date('D, d M y H:i:s O', strtotime('+1 year'));
             $serialNumber = !empty($this->serialNumber) ? $this->serialNumber : new Math_BigInteger();
 
             $this->currentCert = array(
@@ -3329,7 +3329,7 @@ class File_X509 {
 
         $currentCert = isset($this->currentCert) ? $this->currentCert : NULL;
         $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject : NULL;
-        $thisUpdate = !empty($this->startDate) ? $this->startDate : @date('M j H:i:s Y T');
+        $thisUpdate = !empty($this->startDate) ? $this->startDate : @date('D, d M y H:i:s O');
 
         if (isset($crl->currentCert) && is_array($crl->currentCert) && isset($crl->currentCert['tbsCertList'])) {
             $this->currentCert = $crl->currentCert;
@@ -3479,7 +3479,7 @@ class File_X509 {
      */
     function setStartDate($date)
     {
-        $this->startDate = @date('M j H:i:s Y T', @strtotime($date));
+        $this->startDate = @date('D, d M y H:i:s O', @strtotime($date));
     }
 
     /**
@@ -3503,7 +3503,7 @@ class File_X509 {
             $temp = chr(FILE_ASN1_TYPE_GENERALIZED_TIME) . $asn1->_encodeLength(strlen($temp)) . $temp;
             $this->endDate = new File_ASN1_Element($temp);
         } else {
-            $this->endDate = @date('M j H:i:s Y T', @strtotime($date));
+            $this->endDate = @date('D, d M y H:i:s O', @strtotime($date));
         }
     }
 
@@ -4131,7 +4131,7 @@ class File_X509 {
 
         $i = count($rclist);
         $rclist[] = array('userCertificate' => $serial,
-                          'revocationDate'  => array('generalTime' => @date('M j H:i:s Y T')));
+                          'revocationDate'  => array('generalTime' => @date('D, d M y H:i:s O')));
         return $i;
     }
 
diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 8db087d3..0a40ad76 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -329,7 +329,8 @@ class Net_SFTP extends Net_SSH2 {
             0x00000002 => 'NET_SFTP_OPEN_WRITE',
             0x00000004 => 'NET_SFTP_OPEN_APPEND',
             0x00000008 => 'NET_SFTP_OPEN_CREATE',
-            0x00000010 => 'NET_SFTP_OPEN_TRUNCATE'
+            0x00000010 => 'NET_SFTP_OPEN_TRUNCATE',
+            0x00000020 => 'NET_SFTP_OPEN_EXCL'
         );
         // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2
         // see Net_SFTP::_parseLongname() for an explanation
@@ -1050,6 +1051,92 @@ class Net_SFTP extends Net_SSH2 {
         return isset($result['size']) ? $result['size'] : -1;
     }
 
+    /**
+     * Sets access and modification time of file.
+     *
+     * If the file does not exist, it will be created.
+     *
+     * @param String $filename
+     * @param optional Integer $time
+     * @param optional Integer $atime
+     * @return Boolean
+     * @access public
+     */
+    function touch($filename, $time = NULL, $atime = NULL)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $filename = $this->_realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        if (!isset($time)) {
+            $time = time();
+        }
+        if (!isset($atime)) {
+            $atime = $time;
+        }
+
+        $flags = NET_SFTP_OPEN_CREATE | NET_SFTP_OPEN_EXCL;
+        $attr = pack('N3', NET_SFTP_ATTR_ACCESSTIME, $time, $atime);
+        $packet = pack('Na*N2', strlen($filename), $filename, $flags, $attr);
+        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                $handle = substr($response, 4);
+
+                if (!$this->_send_sftp_packet(NET_SFTP_CLOSE, pack('Na*', strlen($handle), $handle))) {
+                    return false;
+                }
+
+                $response = $this->_get_sftp_packet();
+                if ($this->packet_type != NET_SFTP_STATUS) {
+                    user_error('Expected SSH_FXP_STATUS');
+                    return false;
+                }
+
+                extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+                if ($status != NET_SFTP_STATUS_OK) {
+                    $this->_logError($response, $status);
+                    return false;
+                }
+
+                return true;
+            case NET_SFTP_STATUS:
+                $this->_logError($response);
+                break;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+
+        $attr = pack('N3', NET_SFTP_ATTR_ACCESSTIME, $time, $atime);
+        if (!$this->_send_sftp_packet(NET_SFTP_SETSTAT, pack('Na*a*', strlen($filename), $filename, $attr))) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->_logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
     /**
      * Set permissions on a file.
      *
@@ -1057,6 +1144,7 @@ class Net_SFTP extends Net_SSH2 {
      *
      * @param Integer $mode
      * @param String $filename
+     * @param optional Boolean $recursive
      * @return Mixed
      * @access public
      */
@@ -1066,6 +1154,12 @@ class Net_SFTP extends Net_SSH2 {
             return false;
         }
 
+        if (is_string($mode) && is_int($filename)) {
+            $temp = $mode;
+            $mode = $filename;
+            $filename = $temp;
+        }
+
         $filename = $this->_realpath($filename);
         if ($filename === false) {
             return false;
@@ -1323,14 +1417,19 @@ class Net_SFTP extends Net_SSH2 {
      * Currently, only binary mode is supported.  As such, if the line endings need to be adjusted, you will need to take
      * care of that, yourself.
      *
+     * As for $start... if it's negative (which it is by default) a new file will be created or an existing
+     * file truncated depending on $mode | NET_SFTP_RESUME. If it's zero or positive it'll be updated at that
+     * spot.
+     *
      * @param String $remote_file
      * @param String $data
      * @param optional Integer $mode
+     * @param optional Integer $start
      * @return Boolean
      * @access public
      * @internal ASCII mode for SFTPv4/5/6 can be supported by adding a new function - Net_SFTP::setMode().
      */
-    function put($remote_file, $data, $mode = NET_SFTP_STRING)
+    function put($remote_file, $data, $mode = NET_SFTP_STRING, $start = -1)
     {
         if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
             return false;
@@ -1348,9 +1447,13 @@ class Net_SFTP extends Net_SSH2 {
 
         // if NET_SFTP_OPEN_APPEND worked as it should the following (up until the -----------) wouldn't be necessary
         $offset = 0;
-        if ($mode & NET_SFTP_RESUME) {
-            $size = $this->_size($remote_file);
-            $offset = $size !== false ? $size : 0;
+        if (($mode & NET_SFTP_RESUME) || $start >= 0) {
+            if ($start >= 0) {
+                $offset = $start;
+            } else {
+                $size = $this->_size($remote_file);
+                $offset = $size !== false ? $size : 0;
+            }
         } else {
             $flags|= NET_SFTP_OPEN_TRUNCATE;
         }
@@ -1477,10 +1580,14 @@ class Net_SFTP extends Net_SSH2 {
      *
      * Returns a string containing the contents of $remote_file if $local_file is left undefined or a boolean false if
      * the operation was unsuccessful.  If $local_file is defined, returns true or false depending on the success of the
-     * operation
+     * operation.
+     *
+     * $offset and $length can be used to download files in chunks.
      *
      * @param String $remote_file
      * @param optional String $local_file
+     * @param optional Integer $offset
+     * @param optional Integer $length
      * @return Mixed
      * @access public
      */
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 43bfbca2..932af869 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -717,6 +717,21 @@ class Net_SSH2 {
      */
     var $exit_status;
 
+    /**
+     * Flag to request a PTY when using exec()
+     *
+     * @see Net_SSH2::enablePTY()
+     * @access private
+     */
+    var $request_pty = false;
+
+    /**
+     * Flag set while exec() is running when using enablePTY()
+     *
+     * @access private
+     */
+    var $in_request_pty_exec = false;
+
     /**
      * Default Constructor.
      *
@@ -1816,6 +1831,34 @@ class Net_SSH2 {
             return false;
         }
 
+        if ($this->request_pty === true) {
+            $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
+            $packet = pack('CNNa*CNa*N5a*',
+                NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_EXEC], strlen('pty-req'), 'pty-req', 1, strlen('vt100'), 'vt100',
+                80, 24, 0, 0, strlen($terminal_modes), $terminal_modes);
+
+            if (!$this->_send_binary_packet($packet)) {
+                return false;
+            }
+            $response = $this->_get_binary_packet();
+            if ($response === false) {
+                user_error('Connection closed by server');
+                return false;
+            }
+
+            list(, $type) = unpack('C', $this->_string_shift($response, 1));
+
+            switch ($type) {
+                case NET_SSH2_MSG_CHANNEL_SUCCESS:
+                    break;
+                case NET_SSH2_MSG_CHANNEL_FAILURE:
+                default:
+                    user_error('Unable to request pseudo-terminal');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+            }
+            $this->in_request_pty_exec = true;
+        }
+
         // sending a pty-req SSH_MSG_CHANNEL_REQUEST message is unnecessary and, in fact, in most cases, slows things
         // down.  the one place where it might be desirable is if you're doing something like Net_SSH2::exec('ping localhost &').
         // with a pty-req SSH_MSG_CHANNEL_REQUEST, exec() will return immediately and the ping process will then
@@ -1840,7 +1883,7 @@ class Net_SSH2 {
 
         $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA;
 
-        if (!$block) {
+        if (!$block || $this->in_request_pty_exec) {
             return true;
         }
 
@@ -1868,6 +1911,10 @@ class Net_SSH2 {
      */
     function _initShell()
     {
+        if ($this->in_request_pty_exec === true) {
+            return true;
+        }
+
         $this->window_size_client_to_server[NET_SSH2_CHANNEL_SHELL] = 0x7FFFFFFF;
         $packet_size = 0x4000;
 
@@ -1957,6 +2004,8 @@ class Net_SSH2 {
             return false;
         }
 
+        $channel = $this->in_request_pty_exec ? NET_SSH2_CHANNEL_EXEC : NET_SSH2_CHANNEL_SHELL;
+
         $match = $expect;
         while (true) {
             if ($mode == NET_SSH2_READ_REGEX) {
@@ -1967,8 +2016,9 @@ class Net_SSH2 {
             if ($pos !== false) {
                 return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match));
             }
-            $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
+            $response = $this->_get_channel_packet($channel);
             if (is_bool($response)) {
+                $this->in_request_pty_exec = false;
                 return $response ? $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer)) : false;
             }
 
@@ -1996,7 +2046,8 @@ class Net_SSH2 {
             return false;
         }
 
-        return $this->_send_channel_packet(NET_SSH2_CHANNEL_SHELL, $cmd);
+        $channel = $this->in_request_pty_exec ? NET_SSH2_CHANNEL_EXEC : NET_SSH2_CHANNEL_SHELL;
+        return $this->_send_channel_packet($channel, $cmd);
     }
 
     /**
@@ -2219,6 +2270,26 @@ class Net_SSH2 {
         $this->quiet_mode = false;
     }
 
+    /**
+     * Enable request-pty when using exec()
+     *
+     * @access public
+     */
+    function enablePTY()
+    {
+        $this->request_pty = true;
+    }
+
+    /**
+     * Disable request-pty when using exec()
+     *
+     * @access public
+     */
+    function disablePTY()
+    {
+        $this->request_pty = false;
+    }
+
     /**
      * Gets channel data
      *