--- jsch-0.1.53/src/main/java/com/jcraft/jsch/Session.java	2015-06-04 14:27:28.723280674 +0000
+++ jsch-0.1.54/src/main/java/com/jcraft/jsch/Session.java	2016-06-22 16:40:27.120483457 +0000
@@ -123,7 +123,7 @@
   SocketFactory socket_factory=null;
 
   static final int buffer_margin = 32 + // maximum padding length
-                                   20 + // maximum mac length
+                                   64 + // maximum mac length
                                    32;  // margin for deflater; deflater may inflate data
 
   private java.util.Hashtable config=null;