diff --git a/phpseclib/Crypt/Random.php b/phpseclib/Crypt/Random.php
index 948512da..8532aab5 100644
--- a/phpseclib/Crypt/Random.php
+++ b/phpseclib/Crypt/Random.php
@@ -21,10 +21,10 @@
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
- * 
+ *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
diff --git a/phpseclib/Net/SCP.php b/phpseclib/Net/SCP.php
index 5f9517e1..88180cac 100644
--- a/phpseclib/Net/SCP.php
+++ b/phpseclib/Net/SCP.php
@@ -161,10 +161,11 @@ class Net_SCP {
      * @param String $remote_file
      * @param String $data
      * @param optional Integer $mode
+     * @param optional Callable $callback
      * @return Boolean
      * @access public
      */
-    function put($remote_file, $data, $mode = NET_SCP_STRING)
+    function put($remote_file, $data, $mode = NET_SCP_STRING, $callback = null)
     {
         if (!isset($this->ssh)) {
             return false;
@@ -213,6 +214,10 @@ class Net_SCP {
             $temp = $mode & NET_SCP_STRING ? substr($data, $sent, $this->packet_size) : fread($fp, $this->packet_size);
             $this->_send($temp);
             $sent+= strlen($temp);
+
+            if (is_callable($callback)) {
+                $callback($sent);
+            }
         }
         $this->_close();
 
diff --git a/phpseclib/Net/SFTP/Stream.php b/phpseclib/Net/SFTP/Stream.php
index 30cbc86b..4df25c16 100644
--- a/phpseclib/Net/SFTP/Stream.php
+++ b/phpseclib/Net/SFTP/Stream.php
@@ -169,7 +169,7 @@ class Net_SFTP_Stream {
         if ($host[0] == '$') {
             $host = substr($host, 1);
             global $$host;
-            if (!is_object($$host) || get_class($$host) != 'Net_sFTP') {
+            if (!is_object($$host) || get_class($$host) != 'Net_SFTP') {
                 return false;
             }
             $this->sftp = $$host;