ssl: Refactor and start implementing dtls_connection.erl

9 files changed, 602 insertions, 280 deletions

diff --git a/lib/ssl/src/dtls_connection.erl b/lib/ssl/src/dtls_connection.erl
index da2e076856..823bed14fd 100644
--- a/lib/ssl/src/dtls_connection.erl
+++ b/lib/ssl/src/dtls_connection.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2013-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2013-2014. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -20,222 +20,509 @@
 
 %% Internal application API
 
-%%====================================================================
+-behaviour(gen_fsm).
+
+-include("dtls_connection.hrl").
+-include("dtls_handshake.hrl").
+-include("ssl_alert.hrl").
+-include("dtls_record.hrl").
+-include("ssl_cipher.hrl").
+-include("ssl_api.hrl").
+-include("ssl_internal.hrl").
+-include("ssl_srp.hrl").
+-include_lib("public_key/include/public_key.hrl"). 
+
 %% Internal application API
+
+%% Setup
+-export([start_fsm/8]).
+
+%% State transition handling	 
+-export([next_record/1, next_state/4%, 
+	 %%next_state_connection/2
+	]).
+
+%% Handshake handling
+-export([%%renegotiate/1, 
+	 send_handshake/2, send_change_cipher/2]).
+
+%% Alert and close handling
+-export([send_alert/2, handle_own_alert/4, %%handle_close_alert/3,
+	 handle_normal_shutdown/3
+	 %%handle_unexpected_message/3,
+	 %%alert_user/5, alert_user/8
+	]).
+
+%% Data handling
+-export([%%write_application_data/3, 
+	 read_application_data/2%%,
+%%	 passive_receive/2,  next_record_if_active/1
+	]).
+
+%% Called by tls_connection_sup
+-export([start_link/7]). 
+
+%% gen_fsm callbacks
+-export([init/1, hello/2, certify/2, cipher/2,
+	 abbreviated/2, connection/2, handle_event/3,
+         handle_sync_event/4, handle_info/3, terminate/3, code_change/4]).
+
 %%====================================================================
+%% Internal application API
+%%====================================================================	     
+start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = false},_} = Opts,
+	  User, {CbModule, _,_, _} = CbInfo, 
+	  Timeout) -> 
+    try 
+	{ok, Pid} = dtls_connection_sup:start_child([Role, Host, Port, Socket, 
+						     Opts, User, CbInfo]), 
+	{ok, SslSocket} = ssl_connection:socket_control(?MODULE, Socket, Pid, CbModule),
+	ok = ssl_connection:handshake(SslSocket, Timeout),
+	{ok, SslSocket} 
+    catch
+	error:{badmatch, {error, _} = Error} ->
+	    Error
+    end;
+
+start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = true},_} = Opts,
+	  User, {CbModule, _,_, _} = CbInfo, 
+	  Timeout) -> 
+    try 
+	{ok, Pid} = dtls_connection_sup:start_child_dist([Role, Host, Port, Socket, 
+							  Opts, User, CbInfo]), 
+	{ok, SslSocket} = ssl_connection:socket_control(?MODULE, Socket, Pid, CbModule),
+	ok = ssl_connection:handshake(SslSocket, Timeout),
+	{ok, SslSocket} 
+    catch
+	error:{badmatch, {error, _} = Error} ->
+	    Error
+    end.
+
+send_handshake(Handshake, #state{negotiated_version = Version,
+				 tls_handshake_history = Hist0,
+				 connection_states = ConnectionStates0} = State0) ->
+    {BinHandshake, ConnectionStates, Hist} =
+	encode_handshake(Handshake, Version, ConnectionStates0, Hist0),
+    send_flight(BinHandshake, State0#state{connection_states = ConnectionStates,
+					   tls_handshake_history = Hist
+					  }).
+
+send_alert(Alert, #state{negotiated_version = Version,
+			 socket = Socket,
+			 transport_cb = Transport,
+			 connection_states = ConnectionStates0} = State0) ->
+    {BinMsg, ConnectionStates} =
+	ssl_alert:encode(Alert, Version, ConnectionStates0),
+    Transport:send(Socket, BinMsg),
+    State0#state{connection_states = ConnectionStates}.
+
+send_change_cipher(Msg, #state{connection_states = ConnectionStates0,
+			       socket = Socket,
+			       negotiated_version = Version,
+			       transport_cb = Transport} = State0) ->
+    {BinChangeCipher, ConnectionStates} =
+	encode_change_cipher(Msg, Version, ConnectionStates0),
+    Transport:send(Socket, BinChangeCipher),
+    State0#state{connection_states = ConnectionStates}.
 
+%%====================================================================
+%% tls_connection_sup API
+%%====================================================================
 
+%%--------------------------------------------------------------------
+-spec start_link(atom(), host(), inet:port_number(), port(), list(), pid(), tuple()) ->
+    {ok, pid()} | ignore |  {error, reason()}.
+%%
+%% Description: Creates a gen_fsm process which calls Module:init/1 to
+%% initialize. To ensure a synchronized start-up procedure, this function
+%% does not return until Module:init/1 has returned.  
+%%--------------------------------------------------------------------
+start_link(Role, Host, Port, Socket, Options, User, CbInfo) ->
+    {ok, proc_lib:spawn_link(?MODULE, init, [[Role, Host, Port, Socket, Options, User, CbInfo]])}.
+
+init([Role, Host, Port, Socket, {SSLOpts0, _} = Options,  User, CbInfo]) ->
+    process_flag(trap_exit, true),
+    State0 =  initial_state(Role, Host, Port, Socket, Options, User, CbInfo),
+    Handshake = ssl_handshake:init_handshake_history(),
+    TimeStamp = calendar:datetime_to_gregorian_seconds({date(), time()}),
+    try ssl_config:init(SSLOpts0, Role) of
+	{ok, Ref, CertDbHandle, FileRefHandle, CacheHandle, OwnCert, Key, DHParams} ->
+	    Session = State0#state.session,
+	    State = State0#state{
+		      tls_handshake_history = Handshake,
+		      session = Session#session{own_certificate = OwnCert,
+						time_stamp = TimeStamp},
+		      file_ref_db = FileRefHandle,
+		      cert_db_ref = Ref,
+		      cert_db = CertDbHandle,
+		      session_cache = CacheHandle,
+		      private_key = Key,
+		      diffie_hellman_params = DHParams},
+	    gen_fsm:enter_loop(?MODULE, [], hello, State, get_timeout(State))
+    catch
+	throw:Error ->
+	    gen_fsm:enter_loop(?MODULE, [], error, {Error,State0}, get_timeout(State0))
+    end.
+
+%%--------------------------------------------------------------------
+%% Description:There should be one instance of this function for each
+%% possible state name. Whenever a gen_fsm receives an event sent
+%% using gen_fsm:send_event/2, the instance of this function with the
+%% same name as the current state name StateName is called to handle
+%% the event. It is also called if a timeout occurs.
+%%
+hello(start, #state{host = Host, port = Port, role = client,
+		    ssl_options = SslOpts,
+		    session = #session{own_certificate = Cert} = Session0,
+		    session_cache = Cache, session_cache_cb = CacheCb,
+		    transport_cb = Transport, socket = Socket,
+		    connection_states = ConnectionStates0,
+		    renegotiation = {Renegotiation, _}} = State0) ->
+    Hello = dtls_handshake:client_hello(Host, Port, ConnectionStates0, SslOpts,
+					Cache, CacheCb, Renegotiation, Cert),
+    
+    Version = Hello#client_hello.client_version,
+    Handshake0 = ssl_handshake:init_handshake_history(),
+    {BinMsg, ConnectionStates, Handshake} =
+        encode_handshake(Hello, Version, ConnectionStates0, Handshake0),
+    Transport:send(Socket, BinMsg),
+    State1 = State0#state{connection_states = ConnectionStates,
+			  negotiated_version = Version, %% Requested version
+			  session =
+			      Session0#session{session_id = Hello#client_hello.session_id},
+			  tls_handshake_history = Handshake},
+    {Record, State} = next_record(State1),
+    next_state(hello, hello, Record, State);
+
+hello(Hello = #client_hello{client_version = ClientVersion,
+			    extensions = #hello_extensions{hash_signs = HashSigns}},
+      State = #state{connection_states = ConnectionStates0,
+		     port = Port, session = #session{own_certificate = Cert} = Session0,
+		     renegotiation = {Renegotiation, _},
+		     session_cache = Cache,
+		     session_cache_cb = CacheCb,
+		     ssl_options = SslOpts}) ->
+    HashSign = ssl_handshake:select_hashsign(HashSigns, Cert),
+    case dtls_handshake:hello(Hello, SslOpts, {Port, Session0, Cache, CacheCb,
+					      ConnectionStates0, Cert}, Renegotiation) of
+        {Version, {Type, Session},
+	 ConnectionStates,
+	 #hello_extensions{ec_point_formats = EcPointFormats,
+			   elliptic_curves = EllipticCurves} = ServerHelloExt} ->
+            ssl_connection:hello({common_client_hello, Type, ServerHelloExt, HashSign},
+				 State#state{connection_states  = ConnectionStates,
+					     negotiated_version = Version,
+					     session = Session,
+					     client_ecc = {EllipticCurves, EcPointFormats}}, ?MODULE);
+        #alert{} = Alert ->
+            handle_own_alert(Alert, ClientVersion, hello, State)
+    end;
+hello(Hello,
+      #state{connection_states = ConnectionStates0,
+	     negotiated_version = ReqVersion,
+	     role = client,
+	     renegotiation = {Renegotiation, _},
+	     ssl_options = SslOptions} = State) ->
+    case dtls_handshake:hello(Hello, SslOptions, ConnectionStates0, Renegotiation) of
+	#alert{} = Alert ->
+	    handle_own_alert(Alert, ReqVersion, hello, State);
+	{Version, NewId, ConnectionStates, NextProtocol} ->
+	    ssl_connection:handle_session(Hello, 
+					  Version, NewId, ConnectionStates, NextProtocol, State)
+    end;
+
+hello(Msg, State) ->
+    ssl_connection:hello(Msg, State, ?MODULE).
+
+abbreviated(Msg, State) ->
+    ssl_connection:abbreviated(Msg, State, ?MODULE).
+
+certify(Msg, State) ->
+    ssl_connection:certify(Msg, State, ?MODULE).
+
+cipher(Msg, State) ->
+     ssl_connection:cipher(Msg, State, ?MODULE).
+
+connection(#hello_request{}, #state{host = Host, port = Port,
+				    session = #session{own_certificate = Cert} = Session0,
+				    session_cache = Cache, session_cache_cb = CacheCb,
+				    ssl_options = SslOpts,
+				    connection_states = ConnectionStates0,
+				    renegotiation = {Renegotiation, _}} = State0) ->
+    Hello = dtls_handshake:client_hello(Host, Port, ConnectionStates0, SslOpts,
+					Cache, CacheCb, Renegotiation, Cert),
+    %% TODO DTLS version State1 = send_handshake(Hello, State0),
+    State1 = State0,
+    {Record, State} =
+	next_record(
+	  State1#state{session = Session0#session{session_id
+						  = Hello#client_hello.session_id}}),
+    next_state(connection, hello, Record, State);
+
+connection(#client_hello{} = Hello, #state{role = server, allow_renegotiate = true} = State) ->
+    %% Mitigate Computational DoS attack
+    %% http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html
+    %% http://www.thc.org/thc-ssl-dos/ Rather than disabling client
+    %% initiated renegotiation we will disallow many client initiated
+    %% renegotiations immediately after each other.
+    erlang:send_after(?WAIT_TO_ALLOW_RENEGOTIATION, self(), allow_renegotiate),
+    hello(Hello, State#state{allow_renegotiate = false});
+
+connection(#client_hello{}, #state{role = server, allow_renegotiate = false} = State0) ->
+    Alert = ?ALERT_REC(?WARNING, ?NO_RENEGOTIATION),
+    State = send_alert(Alert, State0),
+    next_state_connection(connection, State);
+  
+connection(Msg, State) ->
+     ssl_connection:connection(Msg, State, tls_connection).
+
+%%--------------------------------------------------------------------
+%% Description: Whenever a gen_fsm receives an event sent using
+%% gen_fsm:send_all_state_event/2, this function is called to handle
+%% the event. Not currently used!
+%%--------------------------------------------------------------------
+handle_event(_Event, StateName, State) ->
+    {next_state, StateName, State, get_timeout(State)}.
+
+%%--------------------------------------------------------------------
+%% Description: Whenever a gen_fsm receives an event sent using
+%% gen_fsm:sync_send_all_state_event/2,3, this function is called to handle
+%% the event.
+%%--------------------------------------------------------------------
+handle_sync_event(Event, From, StateName, State) ->
+    ssl_connection:handle_sync_event(Event, From, StateName, State).
+
+%%--------------------------------------------------------------------
+%% Description: This function is called by a gen_fsm when it receives any
+%% other message than a synchronous or asynchronous event
+%% (or a system message).
+%%--------------------------------------------------------------------
+
+%% raw data from socket, unpack records
+handle_info({Protocol, _, Data}, StateName,
+            #state{data_tag = Protocol} = State0) ->
+    %% Simplify for now to avoid dialzer warnings before implementation is  compleate
+    %% case next_tls_record(Data, State0) of
+    %% 	{Record, State} ->
+    %% 	    next_state(StateName, StateName, Record, State);
+    %% 	#alert{} = Alert ->
+    %% 	    handle_normal_shutdown(Alert, StateName, State0), 
+    %% 	    {stop, {shutdown, own_alert}, State0}
+    %% end;
+    {Record, State} = next_tls_record(Data, State0), 
+    next_state(StateName, StateName, Record, State);
+
+handle_info({CloseTag, Socket}, StateName,
+            #state{socket = Socket, close_tag = CloseTag,
+		   negotiated_version = _Version} = State) ->
+    handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
+    {stop, {shutdown, transport_closed}, State};
+
+handle_info(Msg, StateName, State) ->
+    ssl_connection:handle_info(Msg, StateName, State).
+
+%%--------------------------------------------------------------------
+%% Description:This function is called by a gen_fsm when it is about
+%% to terminate. It should be the opposite of Module:init/1 and do any
+%% necessary cleaning up. When it returns, the gen_fsm terminates with
+%% Reason. The return value is ignored.
+%%--------------------------------------------------------------------
+terminate(Reason, StateName, State) ->
+    ssl_connection:terminate(Reason, StateName, State).
+
+%%--------------------------------------------------------------------
+%% code_change(OldVsn, StateName, State, Extra) -> {ok, StateName, NewState}
+%% Description: Convert process state when code is changed
+%%--------------------------------------------------------------------
+code_change(_OldVsn, StateName, State, _Extra) ->
+    {ok, StateName, State}.
+
+%%--------------------------------------------------------------------
+%%% Internal functions
+%%--------------------------------------------------------------------
+encode_handshake(Handshake, Version, ConnectionStates0, Hist0) ->
+    {Handshake, FragmentedHandshake} = dtls_handshake:encode_handshake(Handshake, Version),
+    Hist = ssl_handshake:update_handshake_history(Hist0, Handshake),
+    {Encoded, ConnectionStates} =
+        dtls_record:encode_handshake(FragmentedHandshake, 
+				     Version, ConnectionStates0),
+    {Encoded, ConnectionStates, Hist}.
+
+next_record(#state{%%flight = #flight{state = finished}, 
+		   protocol_buffers =
+		       #protocol_buffers{dtls_packets = [], dtls_cipher_texts = [CT | Rest]}
+		   = Buffers,
+		   connection_states = ConnStates0} = State) ->
+    case dtls_record:decode_cipher_text(CT, ConnStates0) of
+	{Plain, ConnStates} ->		      
+	    {Plain, State#state{protocol_buffers =
+				    Buffers#protocol_buffers{dtls_cipher_texts = Rest},
+				connection_states = ConnStates}};
+	#alert{} = Alert ->
+	    {Alert, State}
+    end;
+next_record(#state{socket = Socket,
+		   transport_cb = Transport} = State) -> %% when FlightState =/= finished
+    ssl_socket:setopts(Transport, Socket, [{active,once}]),
+    {no_record, State};
+
+
+next_record(State) ->
+    {no_record, State}.
+
+next_state(Current,_, #alert{} = Alert, #state{negotiated_version = Version} = State) ->
+    handle_own_alert(Alert, Version, Current, State);
+
+next_state(_,Next, no_record, State) ->
+    {next_state, Next, State, get_timeout(State)};
+
+%% next_state(_,Next, #ssl_tls{type = ?ALERT, fragment = EncAlerts}, State) ->
+%%     Alerts = decode_alerts(EncAlerts),
+%%     handle_alerts(Alerts,  {next_state, Next, State, get_timeout(State)});
+
+next_state(Current, Next, #ssl_tls{type = ?HANDSHAKE, fragment = Data},
+	   State0 = #state{protocol_buffers =
+			       #protocol_buffers{dtls_handshake_buffer = Buf0} = Buffers,
+			   negotiated_version = Version}) ->
+    Handle = 
+   	fun({#hello_request{} = Packet, _}, {next_state, connection = SName, State}) ->
+   		%% This message should not be included in handshake
+   		%% message hashes. Starts new handshake (renegotiation)
+		Hs0 = ssl_handshake:init_handshake_history(),
+		?MODULE:SName(Packet, State#state{tls_handshake_history=Hs0,
+   						  renegotiation = {true, peer}});
+   	   ({#hello_request{} = Packet, _}, {next_state, SName, State}) ->
+   		%% This message should not be included in handshake
+   		%% message hashes. Already in negotiation so it will be ignored!
+   		?MODULE:SName(Packet, State);
+	   ({#client_hello{} = Packet, Raw}, {next_state, connection = SName, State}) ->
+		Version = Packet#client_hello.client_version,
+		Hs0 = ssl_handshake:init_handshake_history(),
+		Hs1 = ssl_handshake:update_handshake_history(Hs0, Raw),
+		?MODULE:SName(Packet, State#state{tls_handshake_history=Hs1,
+   						  renegotiation = {true, peer}});
+	   ({Packet, Raw}, {next_state, SName, State = #state{tls_handshake_history=Hs0}}) ->
+		Hs1 = ssl_handshake:update_handshake_history(Hs0, Raw),
+		?MODULE:SName(Packet, State#state{tls_handshake_history=Hs1});
+   	   (_, StopState) -> StopState
+   	end,
+    try
+	{Packets, Buf} = tls_handshake:get_tls_handshake(Version,Data,Buf0),
+	State = State0#state{protocol_buffers =
+				 Buffers#protocol_buffers{dtls_packets = Packets,
+							  dtls_handshake_buffer = Buf}},
+	handle_dtls_handshake(Handle, Next, State)
+    catch throw:#alert{} = Alert ->
+	    handle_own_alert(Alert, Version, Current, State0)
+    end;
+
+next_state(_, StateName, #ssl_tls{type = ?APPLICATION_DATA, fragment = Data}, State0) ->
+    %% Simplify for now to avoid dialzer warnings before implementation is  compleate
+    %% case read_application_data(Data, State0) of
+    %% 	Stop = {stop,_,_} ->
+    %% 	    Stop;
+    %% 	{Record, State} ->
+    %% 	    next_state(StateName, StateName, Record, State)
+    %% end;
+    {Record, State} = read_application_data(Data, State0),
+    next_state(StateName, StateName, Record, State);
+	
+next_state(Current, Next, #ssl_tls{type = ?CHANGE_CIPHER_SPEC, fragment = <<1>>} = 
+ 	   _ChangeCipher, 
+ 	   #state{connection_states = ConnectionStates0} = State0) ->
+    ConnectionStates1 =
+	ssl_record:activate_pending_connection_state(ConnectionStates0, read),
+    {Record, State} = next_record(State0#state{connection_states = ConnectionStates1}),
+    next_state(Current, Next, Record, State);
+next_state(Current, Next, #ssl_tls{type = _Unknown}, State0) ->
+    %% Ignore unknown type 
+    {Record, State} = next_record(State0),
+    next_state(Current, Next, Record, State).
+
+handle_dtls_handshake(Handle, StateName,
+		     #state{protocol_buffers =
+				#protocol_buffers{dtls_packets = [Packet]} = Buffers} = State) ->
+    FsmReturn = {next_state, StateName, State#state{protocol_buffers =
+							Buffers#protocol_buffers{dtls_packets = []}}},
+    Handle(Packet, FsmReturn);
+
+handle_dtls_handshake(Handle, StateName,
+		     #state{protocol_buffers =
+				#protocol_buffers{dtls_packets = [Packet | Packets]} = Buffers} =
+			 State0) ->
+    FsmReturn = {next_state, StateName, State0#state{protocol_buffers =
+							 Buffers#protocol_buffers{dtls_packets =
+										      Packets}}},
+    case Handle(Packet, FsmReturn) of
+	{next_state, NextStateName, State, _Timeout} ->
+	    handle_dtls_handshake(Handle, NextStateName, State);
+	{stop, _,_} = Stop ->
+	    Stop
+    end.
+
+
+send_flight(Fragments, #state{transport_cb = Transport, socket = Socket,
+			      protocol_buffers = _PBuffers} = State) ->
+    Transport:send(Socket, Fragments),
+    %% Start retransmission
+    %% State#state{protocol_buffers = 
+    %% 		    (PBuffers#protocol_buffers){ #flight{state = waiting}}}}.
+    State.
+
+handle_own_alert(_,_,_, State) -> %% Place holder
+    {stop, {shutdown, own_alert}, State}.
+
+handle_normal_shutdown(_, _, _State) -> %% Place holder
+    ok.
+
+encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) -> 
+    dtls_record:encode_change_cipher_spec(Version, ConnectionStates).
+
+initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions}, User,
+	      {CbModule, DataTag, CloseTag, ErrorTag}) ->
+    ConnectionStates = ssl_record:init_connection_states(Role),
+    
+    SessionCacheCb = case application:get_env(ssl, session_cb) of
+			 {ok, Cb} when is_atom(Cb) ->
+			    Cb;
+			 _  ->
+			     ssl_session_cache
+		     end,
+    
+    Monitor = erlang:monitor(process, User),
+
+    #state{socket_options = SocketOptions,
+	   %% We do not want to save the password in the state so that
+	   %% could be written in the clear into error logs.
+	   ssl_options = SSLOptions#ssl_options{password = undefined},	   
+	   session = #session{is_resumable = new},
+	   transport_cb = CbModule,
+	   data_tag = DataTag,
+	   close_tag = CloseTag,
+	   error_tag = ErrorTag,
+	   role = Role,
+	   host = Host,
+	   port = Port,
+	   socket = Socket,
+	   connection_states = ConnectionStates,
+	   protocol_buffers = #protocol_buffers{},
+	   user_application = {Monitor, User},
+	   user_data_buffer = <<>>,
+	   session_cache_cb = SessionCacheCb,
+	   renegotiation = {false, first},
+	   start_or_recv_from = undefined,
+	   send_queue = queue:new(),
+	   protocol_cb = ?MODULE
+	  }.
+read_application_data(_,State) ->
+    {#ssl_tls{fragment = <<"place holder">>}, State}.
+	
+next_tls_record(_, State) ->
+    {#ssl_tls{fragment = <<"place holder">>}, State}.
+
+get_timeout(_) -> %% Place holder
+    infinity.
+
+next_state_connection(_, State) -> %% Place holder
+    {next_state, connection, State, get_timeout(State)}.
 
-%% %%====================================================================
-%% %% State functions
-%% %%====================================================================
-
-%% -spec hello(start | #hello_request{} | #client_hello{} | #server_hello{} | term(),
-%% 	    #state{}) -> gen_fsm_state_return().
-%% %%--------------------------------------------------------------------
-%% hello(start, #state{host = Host, port = Port, role = client,
-%% 			      ssl_options = SslOpts,
-%% 			      session = #session{own_certificate = Cert} = Session0,
-%% 			      session_cache = Cache, session_cache_cb = CacheCb,
-%% 			      connection_states = ConnectionStates0,
-%% 			      renegotiation = {Renegotiation, _},
-%% 			      client_cookie = Cookie} = State0) ->
-%%     Hello = dtls_handshake:client_hello(Host, Port, Cookie, ConnectionStates0, SslOpts,
-%% 				       Cache, CacheCb, Renegotiation, Cert),
-
-%%     Version = Hello#client_hello.client_version,
-%%     State1 = State0#state{negotiated_version = Version, %% Requested version
-%% 			  session =
-%% 			      Session0#session{session_id = Hello#client_hello.session_id},
-%% 			  dtls_handshake_history = ssl_handshake:init_handshake_history()},
-
-%%     State2 = send_flight(Hello, waiting, State1),
-
-%%     {Record, State} = next_record(State2),
-%%     next_state(hello, hello, Record, State);
-
-%% hello(start, #state{role = server} = State0) ->
-%%     {Record, State} = next_record(State0),
-%%     next_state(hello, hello, Record, State);
-
-%% hello(#hello_request{}, #state{role = client} = State0) ->
-%%     {Record, State} = next_record(State0),
-%%     next_state(hello, hello, Record, State);
-
-%% hello(#server_hello{cipher_suite = CipherSuite,
-%% 		    compression_method = Compression} = Hello,
-%%       #state{session = #session{session_id = OldId},
-%% 	     connection_states = ConnectionStates0,
-%% 	     role = client,
-%% 	     negotiated_version = ReqVersion,
-%% 	     renegotiation = {Renegotiation, _},
-%% 	     ssl_options = SslOptions} = State1) ->
-%%     State0 = flight_done(State1),
-%%     case ssl_handshake:hello(Hello, SslOptions, ConnectionStates0, Renegotiation) of
-%% 	#alert{} = Alert ->
-%% 	    handle_own_alert(Alert, ReqVersion, hello, State0);
-%% 	{Version, NewId, ConnectionStates, NextProtocol} ->
-%% 	    {KeyAlgorithm, _, _, _} =
-%% 		ssl_cipher:suite_definition(CipherSuite),
-
-%% 	    PremasterSecret = make_premaster_secret(ReqVersion, KeyAlgorithm),
-
-%% 	    NewNextProtocol = case NextProtocol of
-%% 				  undefined ->
-%% 				      State0#state.next_protocol;
-%% 				  _ ->
-%% 				      NextProtocol
-%% 			      end,
-
-%% 	    State = State0#state{key_algorithm = KeyAlgorithm,
-%% 				 hashsign_algorithm = default_hashsign(Version, KeyAlgorithm),
-%% 				 negotiated_version = Version,
-%% 				 connection_states = ConnectionStates,
-%% 				 premaster_secret = PremasterSecret,
-%% 				 expecting_next_protocol_negotiation = NextProtocol =/= undefined,
-%% 				 next_protocol = NewNextProtocol},
-
-%% 	    case ssl_session:is_new(OldId, NewId) of
-%% 		true ->
-%% 		    handle_new_session(NewId, CipherSuite, Compression,
-%% 				       State#state{connection_states = ConnectionStates});
-%% 		false ->
-%% 		    handle_resumed_session(NewId, State#state{connection_states = ConnectionStates})
-%% 	    end
-%%     end;
-
-%% hello(#hello_verify_request{cookie = Cookie},
-%%       #state{host = Host, port = Port,
-%% 	     session = #session{own_certificate = Cert},
-%% 	     session_cache = Cache, session_cache_cb = CacheCb,
-%% 	     ssl_options = SslOpts,
-%% 	     connection_states = ConnectionStates0,
-%% 	     renegotiation = {Renegotiation, _}} = State0) ->
-%%     Hello = ssl_handshake:client_hello(Host, Port, Cookie, ConnectionStates0, SslOpts,
-%% 				       Cache, CacheCb, Renegotiation, Cert),
-%%     State1 = State0#state{
-%% 	       tls_handshake_history = ssl_handshake:init_handshake_history(),
-%% 	       client_cookie = Cookie},
-%%     State2 = send_flight(Hello, waiting, State1),
-
-%%     {Record, State} = next_record(State2),
-%%     next_state(hello, hello, Record, State);
-
-
-%% %%--------------------------------------------------------------------
-%% -spec abbreviated(#hello_request{} | #finished{} | term(),
-%% 		  #state{}) -> gen_fsm_state_return().
-%% %%--------------------------------------------------------------------
-
-%% abbreviated(timeout, State) ->
-%%     { next_state, abbreviated, State, hibernate };
-
-%% abbreviated(Msg, State) ->
-%%     handle_unexpected_message(Msg, abbreviated, State).
-
-%% %%--------------------------------------------------------------------
-%% -spec certify(#hello_request{} | #certificate{} |  #server_key_exchange{} |
-%% 	      #certificate_request{} | #server_hello_done{} | #client_key_exchange{} | term(),
-%% 	      #state{}) -> gen_fsm_state_return().
-%% %%--------------------------------------------------------------------
-
-
-%% certify(timeout, State) ->
-%%     { next_state, certify, State, hibernate };
-
-%% certify(Msg, State) ->
-%%     handle_unexpected_message(Msg, certify, State).
-
-
-%% %%--------------------------------------------------------------------
-%% -spec cipher(#hello_request{} | #certificate_verify{} | #finished{} | term(),
-%% 	     #state{}) -> gen_fsm_state_return().
-%% %%--------------------------------------------------------------------
-
-%% cipher(timeout, State) ->
-%%     { next_state, cipher, State, hibernate };
-
-%% cipher(Msg, State) ->
-%%     handle_unexpected_message(Msg, cipher, State).
-
-%% %%--------------------------------------------------------------------
-%% -spec connection(#hello_request{} | #client_hello{} | term(),
-%% 		 #state{}) -> gen_fsm_state_return().
-%% %%--------------------------------------------------------------------
-
-%% connection(timeout, State) ->
-%%     {next_state, connection, State, hibernate};
-
-%% connection(Msg, State) ->
-%%     handle_unexpected_message(Msg, connection, State).
-
-%% %%--------------------------------------------------------------------
-%% %%% Internal functions
-%% %%--------------------------------------------------------------------
-%% handle_unexpected_message(Msg, Info, #state{negotiated_version = Version} = State) ->
-%%     Alert =  ?ALERT_REC(?FATAL,?UNEXPECTED_MESSAGE),
-%%     handle_own_alert(Alert, Version, {Info, Msg}, State).
-
-%% send_flight(HandshakeRec, FlightState, State) ->
-%%     send_flight(FlightState, buffer_flight(HandshakeRec, State)).
-
-%% send_flight(FlightState, State = #state{negotiated_version = Version,
-%% 					flight_buffer = Buffer}) ->
-
-%%     State1 = do_send_flight(queue:to_list(Buffer), [], State),
-%%     finish_send_flight(Version, FlightState, State1).
-
-%% resend_flight(State = #state{negotiated_version = Version,
-%% 			     flight_state = FlightState,
-%% 			     flight_buffer = Buffer})
-%%   when FlightState == finished; FlightState == waiting ->
-%%     State1 = do_send_flight(queue:to_list(Buffer), [], State),
-%%     finish_send_flight(Version, FlightState, State1);
-
-%% resend_flight(State) ->
-%%     State.
-
-%% flight_done(State) ->
-%%     cancel_dtls_retransmit_timer(State#state{flight_state = done,
-%% 					     flight_buffer = undefined}).
-
-%% do_send_flight([], BinMsgs, State = #state{transport_cb = Transport, socket = Socket}) ->
-%%     Transport:send(Socket, lists:reverse(BinMsgs)),
-%%     State;
-%% do_send_flight([{Epoch, MsgSeq, HandshakeRec}|T], BinMsgs0,
-%% 	       State = #state{negotiated_version = Version,
-%% 			      connection_states = ConnectionStates0}) ->
-%%     CS0 = ssl_record:connection_state_by_epoch(ConnectionStates0, Epoch, write),
-%%     {BinMsgs, CS1} = encode_handshake_rec(HandshakeRec, Version, MsgSeq, BinMsgs0, CS0),
-%%     ConnectionStates1 = ssl_record:set_connection_state_by_epoch(ConnectionStates0, CS1, write),
-%%     do_send_flight(T, BinMsgs, State#state{connection_states = ConnectionStates1}).
-
-%% cancel_dtls_retransmit_timer(State = #state{dtls_retransmit_timer = TimerRef}) ->
-%%     cancel_timer(TimerRef),
-%%     State#state{dtls_retransmit_timer = undefined}.
-
-%% rearm_dtls_retransmit_timer(State = #state{dtls_retransmit_timer = undefined}) ->
-%%     TimerRef = erlang:start_timer(1000, self(), dtls_retransmit),
-%%     State#state{dtls_retransmit_timer = TimerRef};
-%% rearm_dtls_retransmit_timer(State) ->
-%%     State.
-
-%% finish_send_flight({254, _}, waiting, State) ->
-%%     TimerRef = erlang:start_timer(1000, self(), dtls_retransmit),
-%%     State#state{
-%%       dtls_retransmit_timer = TimerRef,
-%%       last_retransmit = timestamp(),
-%%       flight_state = waiting};
-
-%% finish_send_flight(_, FlightState, State) ->
-%%     State#state{flight_state = FlightState}.
-
-%% timestamp() ->
-%%     {Mega, Sec, Micro} = erlang:now(),
-%%     Mega * 1000000 * 1000 + Sec * 1000 + (Micro div 1000).
-
-%% encode_handshake_rec(HandshakeRec, Version, MsgSeq, BinMsgs0, CS0) ->
-%%     {_, Fragments} = ssl_handshake:encode_handshake(HandshakeRec, Version, MsgSeq, 1400),
-%%     lists:foldl(fun(F, {Bin, C0}) ->
-%% 			{B, C1} = ssl_record:encode_handshake(F, Version, C0),
-%% 		{[B|Bin], C1} end, {BinMsgs0, CS0}, Fragments).
diff --git a/lib/ssl/src/dtls_connection.hrl b/lib/ssl/src/dtls_connection.hrl
index b8dff479d5..08707dc8de 100644
--- a/lib/ssl/src/dtls_connection.hrl
+++ b/lib/ssl/src/dtls_connection.hrl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2013-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2013-2014. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -28,24 +28,19 @@
 -include("ssl_connection.hrl").
 
 -record(protocol_buffers, {
-	  dtls_packets = []      ::[binary()],  % Not yet handled decode ssl/tls packets.
-          dtls_record_buffer     :: binary(),   % Buffer of incomplete records
-          dtls_handshake_buffer  :: binary(),   % Buffer of incomplete handshakes
-	  dtls_cipher_texts      :: [binary()],
-	  dtls_cipher_texts_next :: [binary()]  % Received for Epoch not yet active
+	  dtls_packets = [],              %%::[binary()],  % Not yet handled decode ssl/tls packets.
+          dtls_record_buffer = <<>>,      %%:: binary(),   % Buffer of incomplete records
+          dtls_handshake_buffer = <<>>,   %%:: binary(),   % Buffer of incomplete handshakes
+	  dtls_cipher_texts = [],         %%:: [binary()],
+	  dtls_cipher_texts_next          %%:: [binary()]  % Received for Epoch not yet active
 	 }).
 
 -record(flight, {
 	  last_retransmit,
 	  last_read_seq,
 	  msl_timer,
-	  flight_state,
-	  flight_buffer,        % buffer of not yet ACKed TLS records
-	 }).
-
--record(message_sequences, {
-	  read = 0,
-	  write = 0
+	  state,
+	  buffer        % buffer of not yet ACKed TLS records
 	 }).
 
 -endif. % -ifdef(dtls_connection).
diff --git a/lib/ssl/src/dtls_connection_sup.erl b/lib/ssl/src/dtls_connection_sup.erl
index 9fe545be18..0b4711cfb4 100644
--- a/lib/ssl/src/dtls_connection_sup.erl
+++ b/lib/ssl/src/dtls_connection_sup.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2007-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2007-2014. All Rights Reserved.
 %% 
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -26,8 +26,8 @@
 -behaviour(supervisor).
 
 %% API
--export([start_link/0]).
--export([start_child/1]).
+-export([start_link/0, start_link_dist/0]).
+-export([start_child/1, start_child_dist/1]).
 
 %% Supervisor callback
 -export([init/1]).
@@ -38,8 +38,14 @@
 start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
 
+start_link_dist() ->
+    supervisor:start_link({local, dtls_connection_sup_dist}, ?MODULE, []).
+
 start_child(Args) ->
     supervisor:start_child(?MODULE, Args).
+        
+start_child_dist(Args) ->
+    supervisor:start_child(dtls_connection_sup_dist, Args).
     
 %%%=========================================================================
 %%%  Supervisor callback
diff --git a/lib/ssl/src/dtls_handshake.erl b/lib/ssl/src/dtls_handshake.erl
index 5db2434753..2ab5598dea 100644
--- a/lib/ssl/src/dtls_handshake.erl
+++ b/lib/ssl/src/dtls_handshake.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2013-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2013-2014. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -21,10 +21,10 @@
 -include("dtls_record.hrl").
 -include("ssl_internal.hrl").
 
--export([client_hello/8, client_hello/9, hello/3,
+-export([client_hello/8, client_hello/9, hello/4,
 	 get_dtls_handshake/2,
 	 dtls_handshake_new_flight/1, dtls_handshake_new_epoch/1,
-	 encode_handshake/4]).
+	 encode_handshake/2]).
 
 %%====================================================================
 %% Internal application API
@@ -32,7 +32,7 @@
 %%--------------------------------------------------------------------
 -spec client_hello(host(), inet:port_number(), #connection_states{},
 		   #ssl_options{}, integer(), atom(), boolean(), der_cert()) ->
-			  #client_hello{}.
+			  #client_hello{}  | {retransmit, term()}.
 %%
 %% Description: Creates a client hello message.
 %%--------------------------------------------------------------------
@@ -45,16 +45,16 @@ client_hello(Host, Port, ConnectionStates, SslOpts,
 %%--------------------------------------------------------------------
 -spec client_hello(host(), inet:port_number(), term(), #connection_states{},
 		   #ssl_options{}, integer(), atom(), boolean(), der_cert()) ->
-			  #client_hello{}.
+			  #client_hello{} | {retransmit, term()}.
 %%
 %% Description: Creates a client hello message.
 %%--------------------------------------------------------------------
 client_hello(Host, Port, Cookie, ConnectionStates,
-	     #ssl_options{versions = Versions,
+	     #ssl_options{versions = _Versions,
 			  ciphers = UserSuites
 			 } = SslOpts,
 	     Cache, CacheCb, Renegotiation, OwnCert) ->
-    Version = dtls_record:highest_protocol_version(Versions),
+    Version =  [{254, 253}], %%dtls_record:highest_protocol_version(Versions),
     Pending = ssl_record:pending_connection_state(ConnectionStates, read),
     SecParams = Pending#connection_state.security_parameters,
     CipherSuites = ssl_handshake:available_suites(UserSuites, Version),
@@ -74,11 +74,17 @@ client_hello(Host, Port, Cookie, ConnectionStates,
 		 }.
 
 hello(Address, Port,
-      #ssl_tls{epoch = _Epoch, record_seq = _Seq,
+      #ssl_tls{epoch = _Epoch, sequence_number = _Seq,
 	       version = Version} = Record) ->
-    {[{Hello, _}], _, _} =
-	get_dtls_handshake(Record,
-			   dtls_handshake_new_flight(undefined)),
+    case get_dtls_handshake(Record,
+				dtls_handshake_new_flight(undefined)) of
+	{[Hello | _], _} ->
+	    hello(Address, Port, Version, Hello);
+	{retransmit, HandshakeState} ->
+	    {retransmit, HandshakeState}
+    end.
+					     
+hello(Address, Port, Version, Hello) ->
     #client_hello{client_version = {Major, Minor},
 		  random = Random,
 		  session_id = SessionId,
@@ -94,19 +100,19 @@ hello(Address, Port,
 	    accept;
 	_ ->
 	    %% generate HelloVerifyRequest
-	    HelloVerifyRequest = encode_handshake(#hello_verify_request{protocol_version = Version,
+	    HelloVerifyRequest = enc_hs(#hello_verify_request{protocol_version = Version,
 									  cookie = Cookie},
 						    Version, 0, 1400),
 	    {reply, HelloVerifyRequest}
     end.
 
 %%--------------------------------------------------------------------
-encode_handshake(Package, Version, MsgSeq, Mss) ->
-    {MsgType, Bin} = enc_hs(Package, Version),
+enc_hs(Package, Version, MsgSeq, Mss) ->
+    {MsgType, Bin} = encode_handshake(Package, Version),
     Len = byte_size(Bin),
-    HsHistory = [MsgType, ?uint24(Len), ?uint16(MsgSeq), ?uint24(0), ?uint24(Len), Bin],
-    BinMsg = dtls_split_handshake(Mss, MsgType, Len, MsgSeq, Bin, 0, []),
-    {HsHistory, BinMsg}.
+    Handshake = [MsgType, ?uint24(Len), ?uint16(MsgSeq), ?uint24(0), ?uint24(Len), Bin],
+    FragmentedHandshake = dtls_fragment(Mss, MsgType, Len, MsgSeq, Bin, 0, []),
+    {Handshake, FragmentedHandshake}.
 
 %--------------------------------------------------------------------
 -spec get_dtls_handshake(#ssl_tls{}, #dtls_hs_state{} | binary()) ->
@@ -147,19 +153,19 @@ dtls_handshake_new_flight(ExpectedReadReq) ->
 %%% Internal functions
 %%--------------------------------------------------------------------
 
-dtls_split_handshake(Mss, MsgType, Len, MsgSeq, Bin, Offset, Acc)
+dtls_fragment(Mss, MsgType, Len, MsgSeq, Bin, Offset, Acc)
   when byte_size(Bin) + 12 < Mss ->
     FragmentLen = byte_size(Bin),
     BinMsg = [MsgType, ?uint24(Len), ?uint16(MsgSeq), ?uint24(Offset), ?uint24(FragmentLen), Bin],
     lists:reverse([BinMsg|Acc]);
-dtls_split_handshake(Mss, MsgType, Len, MsgSeq, Bin, Offset, Acc) ->
+dtls_fragment(Mss, MsgType, Len, MsgSeq, Bin, Offset, Acc) ->
     FragmentLen = Mss - 12,
     <<Fragment:FragmentLen/bytes, Rest/binary>> = Bin,
     BinMsg = [MsgType, ?uint24(Len), ?uint16(MsgSeq), ?uint24(Offset), ?uint24(FragmentLen), Fragment],
-    dtls_split_handshake(Mss, MsgType, Len, MsgSeq, Rest, Offset + FragmentLen, [BinMsg|Acc]).
+    dtls_fragment(Mss, MsgType, Len, MsgSeq, Rest, Offset + FragmentLen, [BinMsg|Acc]).
 
 get_dtls_handshake_aux(#ssl_tls{version = Version,
-				record_seq = SeqNo,
+				sequence_number = SeqNo,
 				fragment = Data}, HsState) ->
     get_dtls_handshake_aux(Version, SeqNo, Data, HsState).
 
@@ -370,14 +376,14 @@ merge_fragment_list([{HStart, HEnd}|Rest], _Frag = {FStart, FEnd}, Acc)
 add_fragment(List, {FragmentOffset, FragmentLength}) ->
     merge_fragment_list(List, {FragmentOffset, FragmentOffset + FragmentLength}, []).
 
-enc_hs(#hello_verify_request{protocol_version = {Major, Minor},
-			     cookie = Cookie}, _Version) ->
+encode_handshake(#hello_verify_request{protocol_version = {Major, Minor},
+				       cookie = Cookie}, _Version) ->
     CookieLength = byte_size(Cookie),
     {?HELLO_VERIFY_REQUEST, <<?BYTE(Major), ?BYTE(Minor),
 			      ?BYTE(CookieLength),
 			      Cookie/binary>>};
 
-enc_hs(#client_hello{client_version = {Major, Minor},
+encode_handshake(#client_hello{client_version = {Major, Minor},
 		     random = Random,
 		     session_id = SessionID,
 		     cookie = Cookie,
@@ -397,7 +403,7 @@ enc_hs(#client_hello{client_version = {Major, Minor},
 		      BinCookie/binary,
 				?UINT16(CsLength), BinCipherSuites/binary,
 		      ?BYTE(CmLength), BinCompMethods/binary, ExtensionsBin/binary>>};
-enc_hs(HandshakeMsg, Version) ->
+encode_handshake(HandshakeMsg, Version) ->
     ssl_handshake:encode_handshake(HandshakeMsg, Version).
 
 enc_client_hello_cookie(_, <<>>) ->
diff --git a/lib/ssl/src/dtls_record.erl b/lib/ssl/src/dtls_record.erl
index b0a7976864..531e2612a5 100644
--- a/lib/ssl/src/dtls_record.erl
+++ b/lib/ssl/src/dtls_record.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2013-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2013-2014. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -35,7 +35,7 @@
 -export([decode_cipher_text/2]).
 
 %% Encoding
--export([encode_plain_text/4]).
+-export([encode_plain_text/4, encode_handshake/3, encode_change_cipher_spec/2]).
 
 %% Protocol version handling
 -export([protocol_version/1, lowest_protocol_version/2,
@@ -70,7 +70,7 @@ get_dtls_records_aux(<<?BYTE(?APPLICATION_DATA),?BYTE(MajVer),?BYTE(MinVer),
 		     Acc) ->
     get_dtls_records_aux(Rest, [#ssl_tls{type = ?APPLICATION_DATA,
 					 version = {MajVer, MinVer},
-					 epoch = Epoch, record_seq = SequenceNumber,
+					 epoch = Epoch, sequence_number = SequenceNumber,
 					 fragment = Data} | Acc]);
 get_dtls_records_aux(<<?BYTE(?HANDSHAKE),?BYTE(MajVer),?BYTE(MinVer),
 		       ?UINT16(Epoch), ?UINT48(SequenceNumber),
@@ -78,7 +78,7 @@ get_dtls_records_aux(<<?BYTE(?HANDSHAKE),?BYTE(MajVer),?BYTE(MinVer),
 		       Data:Length/binary, Rest/binary>>, Acc) when MajVer >= 128 ->
     get_dtls_records_aux(Rest, [#ssl_tls{type = ?HANDSHAKE,
 					 version = {MajVer, MinVer},
-					 epoch = Epoch, record_seq = SequenceNumber,
+					 epoch = Epoch, sequence_number = SequenceNumber,
 					 fragment = Data} | Acc]);
 get_dtls_records_aux(<<?BYTE(?ALERT),?BYTE(MajVer),?BYTE(MinVer),
 		       ?UINT16(Epoch), ?UINT48(SequenceNumber),
@@ -86,7 +86,7 @@ get_dtls_records_aux(<<?BYTE(?ALERT),?BYTE(MajVer),?BYTE(MinVer),
 		       Rest/binary>>, Acc) ->
     get_dtls_records_aux(Rest, [#ssl_tls{type = ?ALERT,
 					 version = {MajVer, MinVer},
-					 epoch = Epoch, record_seq = SequenceNumber,
+					 epoch = Epoch, sequence_number = SequenceNumber,
 					 fragment = Data} | Acc]);
 get_dtls_records_aux(<<?BYTE(?CHANGE_CIPHER_SPEC),?BYTE(MajVer),?BYTE(MinVer),
 		       ?UINT16(Epoch), ?UINT48(SequenceNumber),
@@ -94,7 +94,7 @@ get_dtls_records_aux(<<?BYTE(?CHANGE_CIPHER_SPEC),?BYTE(MajVer),?BYTE(MinVer),
 		     Acc) ->
     get_dtls_records_aux(Rest, [#ssl_tls{type = ?CHANGE_CIPHER_SPEC,
 					 version = {MajVer, MinVer},
-					 epoch = Epoch, record_seq = SequenceNumber,
+					 epoch = Epoch, sequence_number = SequenceNumber,
 					 fragment = Data} | Acc]);
 
 get_dtls_records_aux(<<0:1, _CT:7, ?BYTE(_MajVer), ?BYTE(_MinVer),
@@ -125,14 +125,15 @@ encode_plain_text(Type, Version, Data,
     {Comp, CompS1} = ssl_record:compress(CompAlg, Data, CompS0),
     WriteState1 = WriteState0#connection_state{compression_state = CompS1},
     MacHash = calc_mac_hash(WriteState1, Type, Version, Epoch, Seq, Comp),
-    {CipherFragment, WriteState} = ssl_record:cipher(Version, Comp, WriteState1, MacHash),
+    {CipherFragment, WriteState} = ssl_record:cipher(dtls_v1:corresponding_tls_version(Version), 
+						     Comp, WriteState1, MacHash),
     CipherText = encode_tls_cipher_text(Type, Version, Epoch, Seq, CipherFragment),
     {CipherText, ConnectionStates#connection_states{current_write =
 							WriteState#connection_state{sequence_number = Seq +1}}}.
 
 decode_cipher_text(#ssl_tls{type = Type, version = Version,
 			    epoch = Epoch,
-			    record_seq = Seq,
+			    sequence_number = Seq,
 			    fragment = CipherFragment} = CipherText,
 		   #connection_states{current_read =
 					  #connection_state{compression_state = CompressionS0,
@@ -141,7 +142,7 @@ decode_cipher_text(#ssl_tls{type = Type, version = Version,
     CompressAlg = SecParams#security_parameters.compression_algorithm,
     {PlainFragment, Mac, ReadState1} = ssl_record:decipher(dtls_v1:corresponding_tls_version(Version),
 							   CipherFragment, ReadState0),
-    MacHash = calc_mac_hash(Type, Version, Epoch, Seq, PlainFragment, ReadState1),
+    MacHash = calc_mac_hash(ReadState1, Type, Version, Epoch, Seq, PlainFragment),
     case ssl_record:is_correct_mac(Mac, MacHash) of
 	true ->
 	    {Plain, CompressionS1} = ssl_record:uncompress(CompressAlg,
@@ -153,6 +154,23 @@ decode_cipher_text(#ssl_tls{type = Type, version = Version,
 	false ->
 	    ?ALERT_REC(?FATAL, ?BAD_RECORD_MAC)
     end.
+%%--------------------------------------------------------------------
+-spec encode_handshake(iolist(), tls_version(), #connection_states{}) ->
+			      {iolist(), #connection_states{}}.
+%%
+%% Description: Encodes a handshake message to send on the ssl-socket.
+%%--------------------------------------------------------------------
+encode_handshake(Frag, Version, ConnectionStates) ->
+    encode_plain_text(?HANDSHAKE, Version, Frag, ConnectionStates).
+
+%%--------------------------------------------------------------------
+-spec encode_change_cipher_spec(tls_version(), #connection_states{}) ->
+				       {iolist(), #connection_states{}}.
+%%
+%% Description: Encodes a change_cipher_spec-message to send on the ssl socket.
+%%--------------------------------------------------------------------
+encode_change_cipher_spec(Version, ConnectionStates) ->
+    encode_plain_text(?CHANGE_CIPHER_SPEC, Version, <<1:8>>, ConnectionStates).
 
 %%--------------------------------------------------------------------
 -spec protocol_version(tls_atom_version() | tls_version()) ->
@@ -343,5 +361,5 @@ calc_mac_hash(#connection_state{mac_secret = MacSecret,
 	     Length, Fragment).
 
 mac_hash(Version, MacAlg, MacSecret, SeqNo, Type, Length, Fragment) ->
-    dtls_v1:mac_hash(MacAlg, MacSecret, SeqNo, Type, Version,
+    dtls_v1:mac_hash(Version, MacAlg, MacSecret, SeqNo, Type,
 		     Length, Fragment).
diff --git a/lib/ssl/src/dtls_record.hrl b/lib/ssl/src/dtls_record.hrl
index e935d84bdf..edb77fb2b1 100644
--- a/lib/ssl/src/dtls_record.hrl
+++ b/lib/ssl/src/dtls_record.hrl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2013-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2013-2014. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -28,16 +28,15 @@
 
 -include("ssl_record.hrl"). %% Common TLS and DTLS records and Constantes
 
-%% Used to handle tls_plain_text, tls_compressed and tls_cipher_text
+%% Used to handle dtls_plain_text, dtls_compressed and dtls_cipher_text
 
 -record(ssl_tls, {   
 	  type,
 	  version,
-	  record_seq,      % used in plain_text
-	  epoch,           % used in plain_text  
-	  message_seq, 
-	  fragment_offset,
-	  fragment_length,
+	  epoch,           
+	  sequence_number,      
+	  offset,
+	  length,
 	  fragment
 	 }).
 
diff --git a/lib/ssl/src/ssl.erl b/lib/ssl/src/ssl.erl
index 9e098e12c4..e7b4c3a7bf 100644
--- a/lib/ssl/src/ssl.erl
+++ b/lib/ssl/src/ssl.erl
@@ -558,6 +558,8 @@ handle_options(Opts0, _Role) ->
     Opts = proplists:expand([{binary, [{mode, binary}]},
 			     {list, [{mode, list}]}], Opts0),
     assert_proplist(Opts),
+    RecordCb = record_cb(Opts),
+
     ReuseSessionFun = fun(_, _, _, _) -> true end,
 
     DefaultVerifyNoneFun =
@@ -600,12 +602,14 @@ handle_options(Opts0, _Role) ->
 	end,
 
     CertFile = handle_option(certfile, Opts, <<>>),
-
+    
+    RecordCb = record_cb(Opts),
+    
     Versions = case handle_option(versions, Opts, []) of
 		   [] ->
-		       tls_record:supported_protocol_versions();
+		       RecordCb:supported_protocol_versions();
 		   Vsns  ->
-		       [tls_record:protocol_version(Vsn) || Vsn <- Vsns]
+		       [RecordCb:protocol_version(Vsn) || Vsn <- Vsns]
 	       end,
 
     SSLOptions = #ssl_options{
@@ -1035,6 +1039,13 @@ connection_cb(dtls) ->
 connection_cb(Opts) ->
    connection_cb(proplists:get_value(protocol, Opts, tls)).
 
+record_cb(tls) ->
+    tls_record;
+record_cb(dtls) ->
+    dtls_record;
+record_cb(Opts) ->
+   record_cb(proplists:get_value(protocol, Opts, tls)).
+
 connection_sup(tls_connection) ->
     tls_connection_sup;
 connection_sup(dtls_connection) ->
diff --git a/lib/ssl/src/ssl_cipher.erl b/lib/ssl/src/ssl_cipher.erl
index b2077c662a..97e8a4241f 100644
--- a/lib/ssl/src/ssl_cipher.erl
+++ b/lib/ssl/src/ssl_cipher.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2007-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2007-2014. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -72,7 +72,7 @@ security_parameters(Version, CipherSuite, SecParams) ->
       hash_size = hash_size(Hash)}.
 
 %%--------------------------------------------------------------------
--spec cipher(cipher_enum(), #cipher_state{}, binary(), iolist(), tls_version()) ->
+-spec cipher(cipher_enum(), #cipher_state{}, binary(), iodata(), tls_version()) ->
 		    {binary(), #cipher_state{}}. 
 %%
 %% Description: Encrypts the data and the MAC using chipher described
diff --git a/lib/ssl/src/ssl_record.erl b/lib/ssl/src/ssl_record.erl
index 018c8befe0..4d02ef65d2 100644
--- a/lib/ssl/src/ssl_record.erl
+++ b/lib/ssl/src/ssl_record.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2013-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2013-2014. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -356,7 +356,7 @@ compressions() ->
     [?byte(?NULL)].
 
 %%--------------------------------------------------------------------
--spec cipher(tls_version(), iolist(), #connection_state{}, MacHash::binary()) ->
+-spec cipher(tls_version(), iodata(), #connection_state{}, MacHash::binary()) ->
 		    {CipherFragment::binary(), #connection_state{}}.
 %%
 %% Description: Payload encryption