ssl: Structural perarparation to support DTLS

Also phase in tls module as main API instead of ssl. To
make API clearer. As TLS is the new protocol name.
Maybe keep some API functions in ssl

1 files changed, 0 insertions, 1827 deletions

diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl
deleted file mode 100644
index 77c634616e..0000000000
--- a/lib/ssl/src/ssl_handshake.erl
+++ /dev/null
@@ -1,1827 +0,0 @@
-%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 2007-2013. 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
-%% compliance with the License. You should have received a copy of the
-%% Erlang Public License along with this software. If not, it can be
-%% retrieved online at http://www.erlang.org/.
-%%
-%% Software distributed under the License is distributed on an "AS IS"
-%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
-%% the License for the specific language governing rights and limitations
-%% under the License.
-%%
-%% %CopyrightEnd%
-%%
-
-%%----------------------------------------------------------------------
-%% Purpose: Help funtions for handling the SSL-handshake protocol
-%%----------------------------------------------------------------------
-
--module(ssl_handshake).
-
--include("ssl_handshake.hrl").
--include("ssl_record.hrl").
--include("ssl_cipher.hrl").
--include("ssl_alert.hrl").
--include("ssl_internal.hrl").
--include("ssl_srp.hrl").
--include_lib("public_key/include/public_key.hrl").
-
--export([master_secret/4, client_hello/8, server_hello/7, hello/4,
-	 hello_request/0, certify/7, certificate/4,
-	 client_certificate_verify/6, certificate_verify/6, verify_signature/5,
-	 certificate_request/3, key_exchange/3, server_key_exchange_hash/2,
-	 finished/5, verify_connection/6, get_tls_handshake/3,
-	 decode_client_key/3, decode_server_key/3, server_hello_done/0,
-	 encode_handshake/2, init_handshake_history/0, update_handshake_history/2,
-	 decrypt_premaster_secret/2, prf/5, next_protocol/1]).
-
--export([dec_hello_extensions/2]).
-
--type tls_handshake() :: #client_hello{} | #server_hello{} |
-			 #server_hello_done{} | #certificate{} | #certificate_request{} |
-			 #client_key_exchange{} | #finished{} | #certificate_verify{} |
-			 #hello_request{} | #next_protocol{}.
-
--define(NAMED_CURVE_TYPE, 3).
-
-%%====================================================================
-%% Internal application API
-%%====================================================================
-%%--------------------------------------------------------------------
--spec client_hello(host(), inet:port_number(), #connection_states{},
-		   #ssl_options{}, integer(), atom(), boolean(), der_cert()) ->
-			  #client_hello{}.
-%%
-%% Description: Creates a client hello message.
-%%--------------------------------------------------------------------
-client_hello(Host, Port, ConnectionStates,
-	     #ssl_options{versions = Versions,
-			  ciphers = UserSuites
-			 } = SslOpts,
-	     Cache, CacheCb, Renegotiation, OwnCert) ->
-    Version = ssl_record:highest_protocol_version(Versions),
-    Pending = ssl_record:pending_connection_state(ConnectionStates, read),
-    SecParams = Pending#connection_state.security_parameters,
-    Ciphers = available_suites(UserSuites, Version),
-    SRP = srp_user(SslOpts),
-    {EcPointFormats, EllipticCurves} = default_ecc_extensions(Version),
-
-    Id = ssl_session:client_id({Host, Port, SslOpts}, Cache, CacheCb, OwnCert),
-
-    #client_hello{session_id = Id,
-		  client_version = Version,
-		  cipher_suites = cipher_suites(Ciphers, Renegotiation),
-		  compression_methods = ssl_record:compressions(),
-		  random = SecParams#security_parameters.client_random,
-
-		  renegotiation_info =
-		      renegotiation_info(client, ConnectionStates, Renegotiation),
-		  srp = SRP,
-		  hash_signs = default_hash_signs(),
-		  ec_point_formats = EcPointFormats,
-		  elliptic_curves = EllipticCurves,
-		  next_protocol_negotiation =
-		      encode_client_protocol_negotiation(SslOpts#ssl_options.next_protocol_selector, Renegotiation)
-		 }.
-
-encode_protocol(Protocol, Acc) ->
-	Len = byte_size(Protocol),
-	<<Acc/binary, ?BYTE(Len), Protocol/binary>>.
-
-encode_protocols_advertised_on_server(undefined) ->
-	undefined;
-
-encode_protocols_advertised_on_server(Protocols) ->
-	#next_protocol_negotiation{extension_data = lists:foldl(fun encode_protocol/2, <<>>, Protocols)}.
-
-%%--------------------------------------------------------------------
--spec server_hello(session_id(), tls_version(), #connection_states{}, 
-		   boolean(), [binary()] | undefined,
-		   #ec_point_formats{} | undefined,
-		   #elliptic_curves{} | undefined) -> #server_hello{}.
-%%
-%% Description: Creates a server hello message.
-%%--------------------------------------------------------------------
-server_hello(SessionId, Version, ConnectionStates, Renegotiation,
-	     ProtocolsAdvertisedOnServer, EcPointFormats, EllipticCurves) ->
-    Pending = ssl_record:pending_connection_state(ConnectionStates, read),
-    SecParams = Pending#connection_state.security_parameters,
-    #server_hello{server_version = Version,
-		  cipher_suite = SecParams#security_parameters.cipher_suite,
-                  compression_method = 
-		  SecParams#security_parameters.compression_algorithm,
-		  random = SecParams#security_parameters.server_random,
-		  session_id = SessionId,
-		  renegotiation_info = 
-		  renegotiation_info(server, ConnectionStates, Renegotiation),
-		  ec_point_formats = EcPointFormats,
-		  elliptic_curves = EllipticCurves,
-		  next_protocol_negotiation = encode_protocols_advertised_on_server(ProtocolsAdvertisedOnServer)
-		 }.
-
-%%--------------------------------------------------------------------
--spec hello_request() -> #hello_request{}.
-%%
-%% Description: Creates a hello request message sent by server to 
-%% trigger renegotiation.
-%%--------------------------------------------------------------------
-hello_request() ->
-    #hello_request{}.
-
-%%--------------------------------------------------------------------
--spec hello(#server_hello{} | #client_hello{}, #ssl_options{},
-	    #connection_states{} | {inet:port_number(), #session{}, db_handle(),
-				    atom(), #connection_states{}, binary()},
-	    boolean()) ->
-			  {tls_version(), session_id(), #connection_states{}, binary() | undefined}|
-			  {tls_version(), {resumed | new, #session{}}, #connection_states{}, [binary()] | undefined,
-			  [oid()] | undefined, [oid()] | undefined} |
-			  #alert{}.
-%%
-%% Description: Handles a recieved hello message
-%%--------------------------------------------------------------------
-hello(#server_hello{cipher_suite = CipherSuite, server_version = Version,
-		    compression_method = Compression, random = Random,
-		    session_id = SessionId, renegotiation_info = Info,
-		    hash_signs = _HashSigns} = Hello,
-      #ssl_options{secure_renegotiate = SecureRenegotation, next_protocol_selector = NextProtocolSelector,
-		   versions = SupportedVersions},
-      ConnectionStates0, Renegotiation) ->
-    %%TODO: select hash and signature algorigthm
-    case ssl_record:is_acceptable_version(Version, SupportedVersions) of
-	true ->
-	    case handle_renegotiation_info(client, Info, ConnectionStates0, 
-					   Renegotiation, SecureRenegotation, []) of
-		{ok, ConnectionStates1} ->
-		    ConnectionStates =
-			hello_pending_connection_states(client, Version, CipherSuite, Random,
-							Compression, ConnectionStates1),
-		    case handle_next_protocol(Hello, NextProtocolSelector, Renegotiation) of
-			#alert{} = Alert ->
-			    Alert;
-			    Protocol ->
-			    {Version, SessionId, ConnectionStates, Protocol}
-		    end;
-		#alert{} = Alert ->
-		    Alert
-	    end;
-	false ->
-	    ?ALERT_REC(?FATAL, ?PROTOCOL_VERSION)
-    end;
-			       
-hello(#client_hello{client_version = ClientVersion} = Hello,
-      #ssl_options{versions = Versions} = SslOpts,
-      {Port, Session0, Cache, CacheCb, ConnectionStates0, Cert}, Renegotiation) ->
-    %% TODO: select hash and signature algorithm
-    Version = select_version(ClientVersion, Versions),
-    case ssl_record:is_acceptable_version(Version, Versions) of
-	true ->
-	    %% TODO: need to take supported Curves into Account when selecting the CipherSuite....
-	    %%       if whe have an ECDSA cert with an unsupported curve, we need to drop ECDSA ciphers
-	    {Type, #session{cipher_suite = CipherSuite} = Session1}
-		= select_session(Hello, Port, Session0, Version, 
-				 SslOpts, Cache, CacheCb, Cert),
-	    case CipherSuite of 
-		no_suite ->
-		    ?ALERT_REC(?FATAL, ?INSUFFICIENT_SECURITY);
-		_ ->
-		    try handle_hello_extensions(Hello, Version, SslOpts, Session1, ConnectionStates0, Renegotiation) of
-			{Session, ConnectionStates, ProtocolsToAdvertise, ECPointFormats, EllipticCurves} ->
-			    {Version, {Type, Session}, ConnectionStates,
-			     ProtocolsToAdvertise, ECPointFormats, EllipticCurves}
-		    catch throw:Alert ->
-			    Alert
-		    end
-	    end;
-	false ->
-	    ?ALERT_REC(?FATAL, ?PROTOCOL_VERSION)
-    end.
-
-%%--------------------------------------------------------------------
--spec certify(#certificate{}, db_handle(), certdb_ref(), integer() | nolimit,
-	      verify_peer | verify_none, {fun(), term},
-	      client | server) ->  {der_cert(), public_key_info()} | #alert{}.
-%%
-%% Description: Handles a certificate handshake message
-%%--------------------------------------------------------------------
-certify(#certificate{asn1_certificates = ASN1Certs}, CertDbHandle, CertDbRef,
-	MaxPathLen, _Verify, VerifyFunAndState, Role) ->
-    [PeerCert | _] = ASN1Certs,
-      
-    ValidationFunAndState =
-	case VerifyFunAndState of
-	    undefined ->
-		{fun(OtpCert, ExtensionOrVerifyResult, SslState) ->
-			 ssl_certificate:validate_extension(OtpCert,
-							    ExtensionOrVerifyResult, SslState)
-		 end, Role};
-	    {Fun, UserState0} ->
-		{fun(OtpCert, {extension, _} = Extension, {SslState, UserState}) ->
-			 case ssl_certificate:validate_extension(OtpCert,
-								 Extension,
-								 SslState) of
-			     {valid, NewSslState} ->
-				 {valid, {NewSslState, UserState}};
-			     {fail, Reason} ->
-				 apply_user_fun(Fun, OtpCert, Reason, UserState,
-						SslState);
-			     {unknown, _} ->
-				 apply_user_fun(Fun, OtpCert,
-						Extension, UserState, SslState)
-			 end;
-		    (OtpCert, VerifyResult, {SslState, UserState}) ->
-			 apply_user_fun(Fun, OtpCert, VerifyResult, UserState,
-					SslState)
-		 end, {Role, UserState0}}
-	end,
-
-    try
-	{TrustedErlCert, CertPath}  =
-	    ssl_certificate:trusted_cert_and_path(ASN1Certs, CertDbHandle, CertDbRef),
-	case public_key:pkix_path_validation(TrustedErlCert,
-					      CertPath,
-					     [{max_path_length,
-					       MaxPathLen},
-					      {verify_fun, ValidationFunAndState}]) of
-	    {ok, {PublicKeyInfo,_}} ->
-		{PeerCert, PublicKeyInfo};
-	    {error, Reason} ->
-		path_validation_alert(Reason)
-	end
-    catch
-	error:_ ->
-	    %% ASN-1 decode of certificate somehow failed
-	    ?ALERT_REC(?FATAL, ?CERTIFICATE_UNKNOWN)
-    end.
-
-%%--------------------------------------------------------------------
--spec certificate(der_cert(), db_handle(), certdb_ref(), client | server) -> #certificate{} | #alert{}.
-%%
-%% Description: Creates a certificate message.
-%%--------------------------------------------------------------------
-certificate(OwnCert, CertDbHandle, CertDbRef, client) ->
-    Chain =
-	case ssl_certificate:certificate_chain(OwnCert, CertDbHandle, CertDbRef) of
-	    {ok, CertChain} ->
-		CertChain;
-	    {error, _} -> 
-		%% If no suitable certificate is available, the client
-		%% SHOULD send a certificate message containing no
-		%% certificates. (chapter 7.4.6. RFC 4346)
-		[]	 
-	end,
-    #certificate{asn1_certificates = Chain};
-
-certificate(OwnCert, CertDbHandle, CertDbRef, server) ->
-    case ssl_certificate:certificate_chain(OwnCert, CertDbHandle, CertDbRef) of
-	{ok, Chain} ->
-	    #certificate{asn1_certificates = Chain};
-	{error, _} ->
-	    ?ALERT_REC(?FATAL, ?INTERNAL_ERROR)
-    end.
-
-%%--------------------------------------------------------------------
--spec client_certificate_verify(undefined | der_cert(), binary(),
-				tls_version(), term(), private_key(),
-				tls_handshake_history()) ->
-    #certificate_verify{} | ignore | #alert{}.
-%%
-%% Description: Creates a certificate_verify message, called by the client.
-%%--------------------------------------------------------------------
-client_certificate_verify(undefined, _, _, _, _, _) ->
-    ignore;
-client_certificate_verify(_, _, _, _, undefined, _) ->
-    ignore;
-client_certificate_verify(OwnCert, MasterSecret, Version,
-			  {HashAlgo, SignAlgo},
-			  PrivateKey, {Handshake, _}) ->
-    case public_key:pkix_is_fixed_dh_cert(OwnCert) of
-	true ->
-	    ?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE);
-	false ->
-	    Hashes =
-		calc_certificate_verify(Version, HashAlgo, MasterSecret, Handshake),
-	    Signed = digitally_signed(Version, Hashes, HashAlgo, PrivateKey),
-	    #certificate_verify{signature = Signed, hashsign_algorithm = {HashAlgo, SignAlgo}}
-    end.
-
-%%--------------------------------------------------------------------
--spec certificate_verify(binary(), public_key_info(), tls_version(), term(),
-			 binary(), tls_handshake_history()) -> valid | #alert{}.
-%%
-%% Description: Checks that the certificate_verify message is valid.
-%%--------------------------------------------------------------------
-certificate_verify(Signature, PublicKeyInfo, Version,
-		   HashSign = {HashAlgo, _}, MasterSecret, {_, Handshake}) ->
-    Hash = calc_certificate_verify(Version, HashAlgo, MasterSecret, Handshake),
-    case verify_signature(Version, Hash, HashSign, Signature, PublicKeyInfo) of
-	true ->
-	    valid;
-	_ ->
-    	    ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE)
-    end.
-
-%%--------------------------------------------------------------------
--spec verify_signature(tls_version(), binary(), {term(), term()}, binary(),
-				   public_key_info()) -> true | false.
-%%
-%% Description: Checks that a public_key signature is valid.
-%%--------------------------------------------------------------------
-verify_signature(_Version, _Hash, {_HashAlgo, anon}, _Signature, _) ->
-    true;
-verify_signature({3, Minor}, Hash, {HashAlgo, rsa}, Signature, {?rsaEncryption, PubKey, _PubKeyParams})
-  when Minor >= 3 ->
-    public_key:verify({digest, Hash}, HashAlgo, Signature, PubKey);
-verify_signature(_Version, Hash, _HashAlgo, Signature, {?rsaEncryption, PubKey, _PubKeyParams}) ->
-    case public_key:decrypt_public(Signature, PubKey,
-				   [{rsa_pad, rsa_pkcs1_padding}]) of
-	Hash -> true;
-	_    -> false
-    end;
-verify_signature(_Version, Hash, {HashAlgo, dsa}, Signature, {?'id-dsa', PublicKey, PublicKeyParams}) ->
-    public_key:verify({digest, Hash}, HashAlgo, Signature, {PublicKey, PublicKeyParams});
-verify_signature(_Version, Hash, {HashAlgo, ecdsa}, Signature, {?'id-ecPublicKey', PublicKey, PublicKeyParams}) ->
-    public_key:verify({digest, Hash}, HashAlgo, Signature, {PublicKey, PublicKeyParams}).
-
-%%--------------------------------------------------------------------
--spec certificate_request(#connection_states{}, db_handle(), certdb_ref()) ->
-    #certificate_request{}.
-%%
-%% Description: Creates a certificate_request message, called by the server.
-%%--------------------------------------------------------------------
-certificate_request(ConnectionStates, CertDbHandle, CertDbRef) ->
-    #connection_state{security_parameters = 
-		      #security_parameters{cipher_suite = CipherSuite}} =
-	ssl_record:pending_connection_state(ConnectionStates, read),
-    Types = certificate_types(CipherSuite),
-    HashSigns = default_hash_signs(),
-    Authorities = certificate_authorities(CertDbHandle, CertDbRef),
-    #certificate_request{
-		    certificate_types = Types,
-		    hashsign_algorithms = HashSigns,
-		    certificate_authorities = Authorities
-		   }.
-
-%%--------------------------------------------------------------------
--spec key_exchange(client | server, tls_version(),
-		   {premaster_secret, binary(), public_key_info()} |
-		   {dh, binary()} |
-		   {dh, {binary(), binary()}, #'DHParameter'{}, {HashAlgo::atom(), SignAlgo::atom()},
-		   binary(), binary(), private_key()} |
-		   {ecdh, #'ECPrivateKey'{}} |
-		   {psk, binary()} |
-		   {dhe_psk, binary(), binary()} |
-		   {srp, {binary(), binary()}, #srp_user{}, {HashAlgo::atom(), SignAlgo::atom()},
-		   binary(), binary(), private_key()}) ->
-    #client_key_exchange{} | #server_key_exchange{}.
-%%
-%% Description: Creates a keyexchange message.
-%%--------------------------------------------------------------------
-key_exchange(client, _Version, {premaster_secret, Secret, {_, PublicKey, _}}) ->
-    EncPremasterSecret =
-	encrypted_premaster_secret(Secret, PublicKey),
-    #client_key_exchange{exchange_keys = EncPremasterSecret};
-
-key_exchange(client, _Version, {dh, PublicKey}) ->
-    #client_key_exchange{
-	      exchange_keys = #client_diffie_hellman_public{
-		dh_public = PublicKey}
-	       };
-
-key_exchange(client, _Version, {ecdh, #'ECPrivateKey'{publicKey = {0, ECPublicKey}}}) ->
-    #client_key_exchange{
-	      exchange_keys = #client_ec_diffie_hellman_public{
-		dh_public = ECPublicKey}
-	       };
-
-key_exchange(client, _Version, {psk, Identity}) ->
-    #client_key_exchange{
-	      exchange_keys = #client_psk_identity{
-		identity = Identity}
-	       };
-
-key_exchange(client, _Version, {dhe_psk, Identity, PublicKey}) ->
-    #client_key_exchange{
-	      exchange_keys = #client_dhe_psk_identity{
-		identity = Identity,
-		dh_public = PublicKey}
-	       };
-
-key_exchange(client, _Version, {psk_premaster_secret, PskIdentity, Secret, {_, PublicKey, _}}) ->
-    EncPremasterSecret =
-	encrypted_premaster_secret(Secret, PublicKey),
-    #client_key_exchange{
-		exchange_keys = #client_rsa_psk_identity{
-				   identity = PskIdentity,
-		  exchange_keys = EncPremasterSecret}};
-
-key_exchange(client, _Version, {srp, PublicKey}) ->
-    #client_key_exchange{
-	      exchange_keys = #client_srp_public{
-		srp_a = PublicKey}
-	       };
-
-key_exchange(server, Version, {dh, {PublicKey, _},
-			       #'DHParameter'{prime = P, base = G},
-			       HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
-    ServerDHParams = #server_dh_params{dh_p = int_to_bin(P),
-				       dh_g = int_to_bin(G), dh_y = PublicKey},
-    enc_server_key_exchange(Version, ServerDHParams, HashSign,
-			    ClientRandom, ServerRandom, PrivateKey);
-
-key_exchange(server, Version, {ecdh,  #'ECPrivateKey'{publicKey =  {0, ECPublicKey},
-						      parameters = ECCurve}, HashSign, ClientRandom, ServerRandom,
-	     PrivateKey}) ->
-    ServerECParams = #server_ecdh_params{curve = ECCurve, public = ECPublicKey},
-    enc_server_key_exchange(Version, ServerECParams, HashSign,
-			    ClientRandom, ServerRandom, PrivateKey);
-
-key_exchange(server, Version, {psk, PskIdentityHint,
-			       HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
-    ServerPSKParams = #server_psk_params{hint = PskIdentityHint},
-    enc_server_key_exchange(Version, ServerPSKParams, HashSign,
-			    ClientRandom, ServerRandom, PrivateKey);
-
-key_exchange(server, Version, {dhe_psk, PskIdentityHint, {PublicKey, _},
-			       #'DHParameter'{prime = P, base = G},
-			       HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
-    ServerEDHPSKParams = #server_dhe_psk_params{
-      hint = PskIdentityHint,
-      dh_params = #server_dh_params{dh_p = int_to_bin(P),
-				    dh_g = int_to_bin(G), dh_y = PublicKey}
-     },
-    enc_server_key_exchange(Version, ServerEDHPSKParams,
-			    HashSign, ClientRandom, ServerRandom, PrivateKey);
-
-key_exchange(server, Version, {srp, {PublicKey, _},
-			       #srp_user{generator = Generator, prime = Prime,
-					 salt = Salt},
-			       HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
-    ServerSRPParams = #server_srp_params{srp_n = Prime, srp_g = Generator,
-					 srp_s = Salt, srp_b = PublicKey},
-    enc_server_key_exchange(Version, ServerSRPParams, HashSign,
-			    ClientRandom, ServerRandom, PrivateKey).
-
-enc_server_key_exchange(Version, Params, {HashAlgo, SignAlgo},
-			ClientRandom, ServerRandom, PrivateKey) ->
-    EncParams = enc_server_key(Params),
-    case HashAlgo of
-	null ->
-	    #server_key_params{params = Params,
-			       params_bin = EncParams,
-			       hashsign = {null, anon},
-			       signature = <<>>};
-	_ ->
-	    Hash =
-		server_key_exchange_hash(HashAlgo, <<ClientRandom/binary,
-						     ServerRandom/binary,
-						     EncParams/binary>>),
-	    Signature = digitally_signed(Version, Hash, HashAlgo, PrivateKey),
-	    #server_key_params{params = Params,
-			       params_bin = EncParams,
-			       hashsign = {HashAlgo, SignAlgo},
-			       signature = Signature}
-    end.
-
-%%--------------------------------------------------------------------
--spec master_secret(tls_version(), #session{} | binary(), #connection_states{},
-		   client | server) -> {binary(), #connection_states{}} | #alert{}.
-%%    
-%% Description: Sets or calculates the master secret and calculate keys,
-%% updating the pending connection states. The Mastersecret and the update
-%% connection states are returned or an alert if the calculation fails.
-%%-------------------------------------------------------------------
-master_secret(Version, #session{master_secret = Mastersecret}, 
-	      ConnectionStates, Role) ->
-    ConnectionState = 
-	ssl_record:pending_connection_state(ConnectionStates, read),
-    SecParams = ConnectionState#connection_state.security_parameters,
-    try master_secret(Version, Mastersecret, SecParams, 
-		      ConnectionStates, Role)
-    catch
-	exit:Reason ->
-	    Report = io_lib:format("Key calculation failed due to ~p",
-				   [Reason]),
-	    error_logger:error_report(Report),
-	    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)
-    end;
-
-master_secret(Version, PremasterSecret, ConnectionStates, Role) ->
-    ConnectionState = 
-	ssl_record:pending_connection_state(ConnectionStates, read),
-    SecParams = ConnectionState#connection_state.security_parameters,
-    #security_parameters{prf_algorithm = PrfAlgo,
-			 client_random = ClientRandom,
-			 server_random = ServerRandom} = SecParams, 
-    try master_secret(Version, 
-		      calc_master_secret(Version,PrfAlgo,PremasterSecret,
-				       ClientRandom, ServerRandom),
-		      SecParams, ConnectionStates, Role) 
-    catch
-	exit:Reason ->
-	    Report = io_lib:format("Master secret calculation failed"
-				   " due to ~p", [Reason]),
-	    error_logger:error_report(Report),
-	    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)
-    end.
-
--spec next_protocol(binary()) -> #next_protocol{}.
-
-next_protocol(SelectedProtocol) ->
-  #next_protocol{selected_protocol = SelectedProtocol}.
-
-%%--------------------------------------------------------------------
--spec finished(tls_version(), client | server, integer(), binary(), tls_handshake_history()) ->
-    #finished{}.
-%%
-%% Description: Creates a handshake finished message
-%%-------------------------------------------------------------------
-finished(Version, Role, PrfAlgo, MasterSecret, {Handshake, _}) -> % use the current handshake
-    #finished{verify_data = 
-	      calc_finished(Version, Role, PrfAlgo, MasterSecret, Handshake)}.
-
-%%--------------------------------------------------------------------
--spec verify_connection(tls_version(), #finished{}, client | server, integer(), binary(),
-			tls_handshake_history()) -> verified | #alert{}.
-%%
-%% Description: Checks the ssl handshake finished message to verify
-%%              the connection.
-%%-------------------------------------------------------------------
-verify_connection(Version, #finished{verify_data = Data}, 
-		  Role, PrfAlgo, MasterSecret, {_, Handshake}) ->
-    %% use the previous hashes
-    case calc_finished(Version, Role, PrfAlgo, MasterSecret, Handshake) of
-	Data ->
-	    verified;
-	_ ->
-	    ?ALERT_REC(?FATAL, ?DECRYPT_ERROR)
-    end.
-%%--------------------------------------------------------------------
--spec server_hello_done() ->  #server_hello_done{}.
-%%     
-%% Description: Creates a server hello done message.
-%%--------------------------------------------------------------------	    
-server_hello_done() ->
-    #server_hello_done{}.
-
-%%--------------------------------------------------------------------
--spec encode_handshake(tls_handshake(), tls_version()) -> iolist().
-%%     
-%% Description: Encode a handshake packet to binary
-%%--------------------------------------------------------------------x
-encode_handshake(Package, Version) ->
-    {MsgType, Bin} = enc_hs(Package, Version),
-    Len = byte_size(Bin),
-    [MsgType, ?uint24(Len), Bin].
-
-%%--------------------------------------------------------------------
--spec get_tls_handshake(tls_version(), binary(), binary() | iolist()) ->
-     {[tls_handshake()], binary()}.
-%%
-%% Description: Given buffered and new data from ssl_record, collects
-%% and returns it as a list of handshake messages, also returns leftover
-%% data.
-%%--------------------------------------------------------------------
-get_tls_handshake(Version, Data, <<>>) ->
-    get_tls_handshake_aux(Version, Data, []);
-get_tls_handshake(Version, Data, Buffer) ->
-    get_tls_handshake_aux(Version, list_to_binary([Buffer, Data]), []).
-
-%%--------------------------------------------------------------------
--spec decode_client_key(binary(), key_algo(), tls_version()) ->
-			    #encrypted_premaster_secret{}
-			    | #client_diffie_hellman_public{}
-			    | #client_ec_diffie_hellman_public{}
-			    | #client_psk_identity{}
-			    | #client_dhe_psk_identity{}
-			    | #client_rsa_psk_identity{}
-			    | #client_srp_public{}.
-%%
-%% Description: Decode client_key data and return appropriate type
-%%--------------------------------------------------------------------
-decode_client_key(ClientKey, Type, Version) ->
-    dec_client_key(ClientKey, key_exchange_alg(Type), Version).
-
-%%--------------------------------------------------------------------
--spec decode_server_key(binary(), key_algo(), tls_version()) ->
-			       #server_key_params{}.
-%%
-%% Description: Decode server_key data and return appropriate type
-%%--------------------------------------------------------------------
-decode_server_key(ServerKey, Type, Version) ->
-    dec_server_key(ServerKey, key_exchange_alg(Type), Version).
-
-%%--------------------------------------------------------------------
--spec init_handshake_history() -> tls_handshake_history().
-
-%%
-%% Description: Initialize the empty handshake history buffer.
-%%--------------------------------------------------------------------
-init_handshake_history() ->
-    {[], []}.
-
-%%--------------------------------------------------------------------
--spec update_handshake_history(tls_handshake_history(), Data ::term()) ->
-				      tls_handshake_history().
-%%
-%% Description: Update the handshake history buffer with Data.
-%%--------------------------------------------------------------------
-update_handshake_history(Handshake, % special-case SSL2 client hello
-			 <<?CLIENT_HELLO, ?UINT24(_), ?BYTE(Major), ?BYTE(Minor),
-			   ?UINT16(CSLength), ?UINT16(0),
-			   ?UINT16(CDLength),
-			   CipherSuites:CSLength/binary,
-			   ChallengeData:CDLength/binary>>) ->
-    update_handshake_history(Handshake,
-			     <<?CLIENT_HELLO, ?BYTE(Major), ?BYTE(Minor),
-			       ?UINT16(CSLength), ?UINT16(0),
-			       ?UINT16(CDLength),
-			       CipherSuites:CSLength/binary,
-			       ChallengeData:CDLength/binary>>);
-update_handshake_history({Handshake0, _Prev}, Data) ->
-    {[Data|Handshake0], Handshake0}.
-
-%%--------------------------------------------------------------------
--spec decrypt_premaster_secret(binary(), #'RSAPrivateKey'{}) -> binary().
-
-%%
-%% Description: Public key decryption using the private key.
-%%--------------------------------------------------------------------
-decrypt_premaster_secret(Secret, RSAPrivateKey) ->
-    try public_key:decrypt_private(Secret, RSAPrivateKey,
-				   [{rsa_pad, rsa_pkcs1_padding}])
-    catch
-	_:_ ->
-			io:format("decrypt_premaster_secret error"),
-	    throw(?ALERT_REC(?FATAL, ?DECRYPT_ERROR))
-    end.
-
-%%--------------------------------------------------------------------
--spec server_key_exchange_hash(md5sha | md5 | sha | sha224 |sha256 | sha384 | sha512, binary()) -> binary().
-%%
-%% Description: Calculate server key exchange hash
-%%--------------------------------------------------------------------
-server_key_exchange_hash(md5sha, Value) ->
-    MD5 = crypto:hash(md5, Value),
-    SHA = crypto:hash(sha, Value),
-    <<MD5/binary, SHA/binary>>;
-
-server_key_exchange_hash(Hash, Value) ->
-    crypto:hash(Hash, Value).
-
-%%--------------------------------------------------------------------
--spec prf(tls_version(), binary(), binary(), [binary()], non_neg_integer()) ->
-		 {ok, binary()} | {error, undefined}.
-%%
-%% Description: use the TLS PRF to generate key material
-%%--------------------------------------------------------------------
-prf({3,0}, _, _, _, _) ->
-    {error, undefined};
-prf({3,1}, Secret, Label, Seed, WantedLength) ->
-    {ok, ssl_tls1:prf(?MD5SHA, Secret, Label, Seed, WantedLength)};
-prf({3,_N}, Secret, Label, Seed, WantedLength) ->
-    {ok, ssl_tls1:prf(?SHA256, Secret, Label, Seed, WantedLength)}.
-
-%%--------------------------------------------------------------------
-%%% Internal functions
-%%--------------------------------------------------------------------
-get_tls_handshake_aux(Version, <<?BYTE(Type), ?UINT24(Length),
-			Body:Length/binary,Rest/binary>>, Acc) ->
-    Raw = <<?BYTE(Type), ?UINT24(Length), Body/binary>>,
-    H = dec_hs(Version, Type, Body),
-    get_tls_handshake_aux(Version, Rest, [{H,Raw} | Acc]);
-get_tls_handshake_aux(_Version, Data, Acc) ->
-    {lists:reverse(Acc), Data}.
-
-path_validation_alert({bad_cert, cert_expired}) ->
-    ?ALERT_REC(?FATAL, ?CERTIFICATE_EXPIRED);
-path_validation_alert({bad_cert, invalid_issuer}) ->
-    ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE);
-path_validation_alert({bad_cert, invalid_signature}) ->
-    ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE);
-path_validation_alert({bad_cert, name_not_permitted}) ->
-    ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE);
-path_validation_alert({bad_cert, unknown_critical_extension}) ->
-    ?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE);
-path_validation_alert({bad_cert, cert_revoked}) ->
-    ?ALERT_REC(?FATAL, ?CERTIFICATE_REVOKED);
-path_validation_alert({bad_cert, selfsigned_peer}) ->
-    ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE);
-path_validation_alert({bad_cert, unknown_ca}) ->
-     ?ALERT_REC(?FATAL, ?UNKNOWN_CA);
-path_validation_alert(_) ->
-    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE).
-
-select_session(Hello, Port, Session, Version,
-	       #ssl_options{ciphers = UserSuites} = SslOpts, Cache, CacheCb, Cert) ->
-    SuggestedSessionId = Hello#client_hello.session_id,
-    {SessionId, Resumed} = ssl_session:server_id(Port, SuggestedSessionId,
-						 SslOpts, Cert,
-						 Cache, CacheCb),
-    Suites = available_suites(Cert, UserSuites, Version),
-    case Resumed of
-        undefined ->
-	    CipherSuite = select_cipher_suite(Hello#client_hello.cipher_suites, Suites),
-	    Compressions = Hello#client_hello.compression_methods,
-	    Compression = select_compression(Compressions),
-	    {new, Session#session{session_id = SessionId,
-				  cipher_suite = CipherSuite,
-				  compression_method = Compression}};
-	_ ->
-	    {resumed, Resumed}
-    end.
-
-available_suites(UserSuites, Version) ->
-    case UserSuites of
-	[] ->
-	    ssl_cipher:suites(Version);
-	_ ->
-	    UserSuites
-    end.
-
-available_suites(ServerCert, UserSuites, Version) ->
-    ssl_cipher:filter(ServerCert, available_suites(UserSuites, Version)).
- 
-cipher_suites(Suites, false) ->
-    [?TLS_EMPTY_RENEGOTIATION_INFO_SCSV | Suites];
-cipher_suites(Suites, true) ->
-    Suites.
-
-srp_user(#ssl_options{srp_identity = {UserName, _}}) ->
-    #srp{username = UserName};
-srp_user(_) ->
-    undefined.
-
-renegotiation_info(client, _, false) ->
-    #renegotiation_info{renegotiated_connection = undefined};
-renegotiation_info(server, ConnectionStates, false) ->
-    CS  = ssl_record:current_connection_state(ConnectionStates, read),
-    case CS#connection_state.secure_renegotiation of
-	true ->
-	    #renegotiation_info{renegotiated_connection = ?byte(0)};
-	false ->
-	    #renegotiation_info{renegotiated_connection = undefined}
-    end;
-renegotiation_info(client, ConnectionStates, true) ->
-    CS = ssl_record:current_connection_state(ConnectionStates, read),
-    case CS#connection_state.secure_renegotiation of
-	true ->
-	    Data = CS#connection_state.client_verify_data,
-	    #renegotiation_info{renegotiated_connection = Data};
-	false ->
-	    #renegotiation_info{renegotiated_connection = undefined}
-    end;
-
-renegotiation_info(server, ConnectionStates, true) ->
-    CS = ssl_record:current_connection_state(ConnectionStates, read),
-    case CS#connection_state.secure_renegotiation of
-	true ->
-	    CData = CS#connection_state.client_verify_data,
-	    SData  =CS#connection_state.server_verify_data,
-	    #renegotiation_info{renegotiated_connection = <<CData/binary, SData/binary>>};
-	false ->
-	    #renegotiation_info{renegotiated_connection = undefined}
-    end. 
-
-decode_next_protocols({next_protocol_negotiation, Protocols}) ->
-    decode_next_protocols(Protocols, []).
-decode_next_protocols(<<>>, Acc) ->
-    lists:reverse(Acc);
-decode_next_protocols(<<?BYTE(Len), Protocol:Len/binary, Rest/binary>>, Acc) ->
-    case Len of
-        0 ->
-            {error, invalid_next_protocols};
-        _ ->
-            decode_next_protocols(Rest, [Protocol|Acc])
-    end;
-decode_next_protocols(_Bytes, _Acc) ->
-    {error, invalid_next_protocols}.
-
-next_protocol_extension_allowed(NextProtocolSelector, Renegotiating) ->
-    NextProtocolSelector =/= undefined andalso not Renegotiating.
-
-handle_next_protocol_on_server(#client_hello{next_protocol_negotiation = undefined}, _Renegotiation, _SslOpts) ->
-    undefined;
-
-handle_next_protocol_on_server(#client_hello{next_protocol_negotiation = {next_protocol_negotiation, <<>>}},
-			       false, #ssl_options{next_protocols_advertised = Protocols}) ->
-    Protocols;
-
-handle_next_protocol_on_server(_Hello, _Renegotiation, _SSLOpts) ->
-    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE). % unexpected next protocol extension
-
-handle_next_protocol(#server_hello{next_protocol_negotiation = undefined},
-    _NextProtocolSelector, _Renegotiating) ->
-    undefined;
-
-handle_next_protocol(#server_hello{next_protocol_negotiation = Protocols},
-    NextProtocolSelector, Renegotiating) ->
-
-    case next_protocol_extension_allowed(NextProtocolSelector, Renegotiating) of
-        true ->
-            select_next_protocol(decode_next_protocols(Protocols), NextProtocolSelector);
-        false ->
-            ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE) % unexpected next protocol extension
-    end.
-
-select_next_protocol({error, _Reason}, _NextProtocolSelector) ->
-    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE);
-select_next_protocol(Protocols, NextProtocolSelector) ->
-    case NextProtocolSelector(Protocols) of
-	?NO_PROTOCOL ->
-	    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE);
-	Protocol when is_binary(Protocol)  ->
-	    Protocol
-    end.
-
-default_ecc_extensions(Version) ->
-    CryptoSupport = proplists:get_value(public_keys, crypto:supports()),
-    case proplists:get_bool(ecdh, CryptoSupport) of
-	true ->
-	    EcPointFormats = #ec_point_formats{ec_point_format_list = [?ECPOINT_UNCOMPRESSED]},
-	    EllipticCurves = #elliptic_curves{elliptic_curve_list = ssl_tls1:ecc_curves(Version)},
-	    {EcPointFormats, EllipticCurves};
-	_ ->
-	    {undefined, undefined}
-    end.
-
-handle_ecc_extensions(Version, EcPointFormats0, EllipticCurves0) ->
-    CryptoSupport = proplists:get_value(public_keys, crypto:supports()),
-    case proplists:get_bool(ecdh, CryptoSupport) of
-	true ->
-	    EcPointFormats1 = handle_ecc_point_fmt_extension(EcPointFormats0),
-	    EllipticCurves1 = handle_ecc_curves_extension(Version, EllipticCurves0),
-	    {EcPointFormats1, EllipticCurves1};
-	_ ->
-	    {undefined, undefined}
-    end.
-
-handle_ecc_point_fmt_extension(undefined) ->
-    undefined;
-handle_ecc_point_fmt_extension(_) ->
-    #ec_point_formats{ec_point_format_list = [?ECPOINT_UNCOMPRESSED]}.
-
-handle_ecc_curves_extension(Version, undefined) ->
-    undefined;
-handle_ecc_curves_extension(Version, _) ->
-    #elliptic_curves{elliptic_curve_list = ssl_tls1:ecc_curves(Version)}.
-
-handle_renegotiation_info(_, #renegotiation_info{renegotiated_connection = ?byte(0)}, 
-			  ConnectionStates, false, _, _) ->
-    {ok, ssl_record:set_renegotiation_flag(true, ConnectionStates)};
-
-handle_renegotiation_info(server, undefined, ConnectionStates, _, _, CipherSuites) -> 
-    case is_member(?TLS_EMPTY_RENEGOTIATION_INFO_SCSV, CipherSuites) of
-	true ->
-	    {ok, ssl_record:set_renegotiation_flag(true, ConnectionStates)};
-	false ->
-	    {ok, ssl_record:set_renegotiation_flag(false, ConnectionStates)}
-    end;
-
-handle_renegotiation_info(_, undefined, ConnectionStates, false, _, _) ->
-    {ok, ssl_record:set_renegotiation_flag(false, ConnectionStates)};
-
-handle_renegotiation_info(client, #renegotiation_info{renegotiated_connection = ClientServerVerify}, 
-			  ConnectionStates, true, _, _) ->
-    CS = ssl_record:current_connection_state(ConnectionStates, read),
-    CData = CS#connection_state.client_verify_data,
-    SData = CS#connection_state.server_verify_data,    
-    case <<CData/binary, SData/binary>> == ClientServerVerify of
-	true ->
-	    {ok, ConnectionStates};
-	false ->
-	    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)
-    end;
-handle_renegotiation_info(server, #renegotiation_info{renegotiated_connection = ClientVerify}, 
-			  ConnectionStates, true, _, CipherSuites) ->
-    
-      case is_member(?TLS_EMPTY_RENEGOTIATION_INFO_SCSV, CipherSuites) of
-	  true ->
-	      ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE);
-	  false ->	
-	      CS = ssl_record:current_connection_state(ConnectionStates, read),
-	      Data = CS#connection_state.client_verify_data,
-	      case Data == ClientVerify of
-		  true ->
-		      {ok, ConnectionStates};
-		  false ->
-		      ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)
-	      end
-      end;
-
-handle_renegotiation_info(client, undefined, ConnectionStates, true, SecureRenegotation, _) ->
-    handle_renegotiation_info(ConnectionStates, SecureRenegotation);
-
-handle_renegotiation_info(server, undefined, ConnectionStates, true, SecureRenegotation, CipherSuites) ->
-     case is_member(?TLS_EMPTY_RENEGOTIATION_INFO_SCSV, CipherSuites) of
-	  true ->
-	     ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE);
-	 false ->
-	     handle_renegotiation_info(ConnectionStates, SecureRenegotation)
-     end.
-
-handle_renegotiation_info(ConnectionStates, SecureRenegotation) ->
-    CS = ssl_record:current_connection_state(ConnectionStates, read),
-    case {SecureRenegotation, CS#connection_state.secure_renegotiation} of
-	{_, true} ->
-	    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE);
-	{true, false} ->
-	    ?ALERT_REC(?FATAL, ?NO_RENEGOTIATION);
-	{false, false} ->
-	    {ok, ConnectionStates}
-    end.
-
-%% Update pending connection states with parameters exchanged via 
-%% hello messages
-%% NOTE : Role is the role of the receiver of the hello message
-%%        currently being processed.
-hello_pending_connection_states(Role, Version, CipherSuite, Random, Compression,
-				 ConnectionStates) ->    
-    ReadState =  
-	ssl_record:pending_connection_state(ConnectionStates, read),
-    WriteState = 
-	ssl_record:pending_connection_state(ConnectionStates, write),
-    
-    NewReadSecParams = 
-	hello_security_parameters(Role, Version, ReadState, CipherSuite,
-			    Random, Compression),
-    
-    NewWriteSecParams =
-	hello_security_parameters(Role, Version, WriteState, CipherSuite,
-			    Random, Compression),
- 
-    ssl_record:update_security_params(NewReadSecParams,
-				    NewWriteSecParams,
-				    ConnectionStates).
-
-hello_security_parameters(client, Version, ConnectionState, CipherSuite, Random,
-			  Compression) ->   
-    SecParams = ConnectionState#connection_state.security_parameters,
-    NewSecParams = ssl_cipher:security_parameters(Version, CipherSuite, SecParams),
-    NewSecParams#security_parameters{
-      server_random = Random,
-      compression_algorithm = Compression
-     };
-
-hello_security_parameters(server, Version, ConnectionState, CipherSuite, Random,
-			  Compression) ->
-    SecParams = ConnectionState#connection_state.security_parameters,
-    NewSecParams = ssl_cipher:security_parameters(Version, CipherSuite, SecParams),
-    NewSecParams#security_parameters{
-      client_random = Random,
-      compression_algorithm = Compression
-     }.
-
-select_version(ClientVersion, Versions) ->   
-    ServerVersion = ssl_record:highest_protocol_version(Versions),
-    ssl_record:lowest_protocol_version(ClientVersion, ServerVersion).
-
-select_cipher_suite([], _) ->
-   no_suite;
-select_cipher_suite([Suite | ClientSuites], SupportedSuites) ->
-    case is_member(Suite, SupportedSuites) of
-	true ->
-	    Suite;
-        false ->
-	    select_cipher_suite(ClientSuites, SupportedSuites)
-    end.
-
-is_member(Suite, SupportedSuites) ->
-    lists:member(Suite, SupportedSuites).
-
-select_compression(_CompressionMetodes) ->
-    ?NULL.
-
-master_secret(Version, MasterSecret, #security_parameters{
-			 client_random = ClientRandom,
-			 server_random = ServerRandom,
-			 hash_size = HashSize,
-			 prf_algorithm = PrfAlgo,
-			 key_material_length = KML,
-			 expanded_key_material_length = EKML,
-			 iv_size = IVS},
-	      ConnectionStates, Role) ->
-    {ClientWriteMacSecret, ServerWriteMacSecret, ClientWriteKey,
-     ServerWriteKey, ClientIV, ServerIV} =
-	setup_keys(Version, PrfAlgo, MasterSecret, ServerRandom,
-		   ClientRandom, HashSize, KML, EKML, IVS),
-
-    ConnStates1 = ssl_record:set_master_secret(MasterSecret, ConnectionStates),
-    ConnStates2 =
-	ssl_record:set_mac_secret(ClientWriteMacSecret, ServerWriteMacSecret,
-				  Role, ConnStates1),
-
-    ClientCipherState = #cipher_state{iv = ClientIV, key = ClientWriteKey},
-    ServerCipherState = #cipher_state{iv = ServerIV, key = ServerWriteKey}, 
-    {MasterSecret, 
-     ssl_record:set_pending_cipher_state(ConnStates2, ClientCipherState, 
-					 ServerCipherState, Role)}.
-
-
-dec_hs(_, ?NEXT_PROTOCOL, <<?BYTE(SelectedProtocolLength), SelectedProtocol:SelectedProtocolLength/binary,
-                         ?BYTE(PaddingLength), _Padding:PaddingLength/binary>>) ->
-	#next_protocol{selected_protocol = SelectedProtocol};
-
-dec_hs(_, ?HELLO_REQUEST, <<>>) ->
-    #hello_request{};
-
-%% Client hello v2.
-%% The server must be able to receive such messages, from clients that
-%% are willing to use ssl v3 or higher, but have ssl v2 compatibility.
-dec_hs(_Version, ?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor),
-				  ?UINT16(CSLength), ?UINT16(0),
-				  ?UINT16(CDLength),
-				  CipherSuites:CSLength/binary,
-				  ChallengeData:CDLength/binary>>) ->
-    #client_hello{client_version = {Major, Minor},
-		  random = ssl_ssl2:client_random(ChallengeData, CDLength),
-		  session_id = 0,
-		  cipher_suites = from_3bytes(CipherSuites),
-		  compression_methods = [?NULL],
-		  renegotiation_info = undefined
-		 };
-dec_hs(_Version, ?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
-		       ?BYTE(SID_length), Session_ID:SID_length/binary,
-		       ?UINT16(Cs_length), CipherSuites:Cs_length/binary,
-		       ?BYTE(Cm_length), Comp_methods:Cm_length/binary,
-		       Extensions/binary>>) ->
-
-    DecodedExtensions = dec_hello_extensions(Extensions),
-    RenegotiationInfo = proplists:get_value(renegotiation_info, DecodedExtensions, undefined),
-    SRP = proplists:get_value(srp, DecodedExtensions, undefined),
-    HashSigns = proplists:get_value(hash_signs, DecodedExtensions, undefined),
-    EllipticCurves = proplists:get_value(elliptic_curves, DecodedExtensions,
-					 undefined),
-    NextProtocolNegotiation = proplists:get_value(next_protocol_negotiation, DecodedExtensions, undefined),
-
-    #client_hello{
-       client_version = {Major,Minor},
-       random = Random,
-       session_id = Session_ID,
-       cipher_suites = from_2bytes(CipherSuites),
-       compression_methods = Comp_methods,
-       renegotiation_info = RenegotiationInfo,
-	srp = SRP,
-       hash_signs = HashSigns,
-       elliptic_curves = EllipticCurves,
-       next_protocol_negotiation = NextProtocolNegotiation
-      };
-
-dec_hs(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
-		       ?BYTE(SID_length), Session_ID:SID_length/binary,
-		       Cipher_suite:2/binary, ?BYTE(Comp_method)>>) ->
-    #server_hello{
-	server_version = {Major,Minor},
-	random = Random,
-	session_id = Session_ID,
-	cipher_suite = Cipher_suite,
-	compression_method = Comp_method,
-	renegotiation_info = undefined,
-	hash_signs = undefined,
-	elliptic_curves = undefined};
-
-dec_hs(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
-		       ?BYTE(SID_length), Session_ID:SID_length/binary,
-		       Cipher_suite:2/binary, ?BYTE(Comp_method),
-		       ?UINT16(ExtLen), Extensions:ExtLen/binary>>) ->
-    
-    HelloExtensions = dec_hello_extensions(Extensions, []),
-    RenegotiationInfo = proplists:get_value(renegotiation_info, HelloExtensions,
-					   undefined),
-    HashSigns = proplists:get_value(hash_signs, HelloExtensions,
-					   undefined),
-    EllipticCurves = proplists:get_value(elliptic_curves, HelloExtensions,
-					   undefined),
-    NextProtocolNegotiation = proplists:get_value(next_protocol_negotiation, HelloExtensions, undefined),
-
-    #server_hello{
-	server_version = {Major,Minor},
-	random = Random,
-	session_id = Session_ID,
-	cipher_suite = Cipher_suite,
-	compression_method = Comp_method,
-	renegotiation_info = RenegotiationInfo,
-	hash_signs = HashSigns,
-	elliptic_curves = EllipticCurves,
-       next_protocol_negotiation = NextProtocolNegotiation};
-dec_hs(_Version, ?CERTIFICATE, <<?UINT24(ACLen), ASN1Certs:ACLen/binary>>) ->
-    #certificate{asn1_certificates = certs_to_list(ASN1Certs)};
-dec_hs(_Version, ?SERVER_KEY_EXCHANGE, Keys) ->
-    #server_key_exchange{exchange_keys = Keys};
-dec_hs({Major, Minor}, ?CERTIFICATE_REQUEST,
-       <<?BYTE(CertTypesLen), CertTypes:CertTypesLen/binary,
-	?UINT16(HashSignsLen), HashSigns:HashSignsLen/binary,
-	?UINT16(CertAuthsLen), CertAuths:CertAuthsLen/binary>>)
-  when Major == 3, Minor >= 3 ->
-    HashSignAlgos = [{ssl_cipher:hash_algorithm(Hash), ssl_cipher:sign_algorithm(Sign)} ||
-			<<?BYTE(Hash), ?BYTE(Sign)>> <= HashSigns],
-    #certificate_request{certificate_types = CertTypes,
-			 hashsign_algorithms = #hash_sign_algos{hash_sign_algos = HashSignAlgos},
-			 certificate_authorities = CertAuths};
-dec_hs(_Version, ?CERTIFICATE_REQUEST,
-       <<?BYTE(CertTypesLen), CertTypes:CertTypesLen/binary,
-	?UINT16(CertAuthsLen), CertAuths:CertAuthsLen/binary>>) ->
-    #certificate_request{certificate_types = CertTypes,
-			 certificate_authorities = CertAuths};
-dec_hs(_Version, ?SERVER_HELLO_DONE, <<>>) ->
-    #server_hello_done{};
-dec_hs({Major, Minor}, ?CERTIFICATE_VERIFY,<<HashSign:2/binary, ?UINT16(SignLen), Signature:SignLen/binary>>)
-  when Major == 3, Minor >= 3 ->
-    #certificate_verify{hashsign_algorithm = hashsign_dec(HashSign), signature = Signature};
-dec_hs(_Version, ?CERTIFICATE_VERIFY,<<?UINT16(SignLen), Signature:SignLen/binary>>)->
-    #certificate_verify{signature = Signature};
-dec_hs(_Version, ?CLIENT_KEY_EXCHANGE, PKEPMS) ->
-    #client_key_exchange{exchange_keys = PKEPMS};
-dec_hs(_Version, ?FINISHED, VerifyData) ->
-    #finished{verify_data = VerifyData};
-dec_hs(_, _, _) ->
-    throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)).
-
-dec_client_key(PKEPMS, ?KEY_EXCHANGE_RSA, {3, 0}) ->
-    #encrypted_premaster_secret{premaster_secret = PKEPMS};
-dec_client_key(<<?UINT16(_), PKEPMS/binary>>, ?KEY_EXCHANGE_RSA, _) ->
-    #encrypted_premaster_secret{premaster_secret = PKEPMS};
-dec_client_key(<<>>, ?KEY_EXCHANGE_DIFFIE_HELLMAN, _) ->
-    throw(?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE));
-dec_client_key(<<?UINT16(DH_YLen), DH_Y:DH_YLen/binary>>,
-	       ?KEY_EXCHANGE_DIFFIE_HELLMAN, _) ->
-    #client_diffie_hellman_public{dh_public = DH_Y};
-dec_client_key(<<>>, ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN, _) ->
-    throw(?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE));
-dec_client_key(<<?BYTE(DH_YLen), DH_Y:DH_YLen/binary>>,
-	       ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN, _) ->
-    #client_ec_diffie_hellman_public{dh_public = DH_Y};
-dec_client_key(<<?UINT16(Len), Id:Len/binary>>,
-	       ?KEY_EXCHANGE_PSK, _) ->
-    #client_psk_identity{identity = Id};
-dec_client_key(<<?UINT16(Len), Id:Len/binary,
-		 ?UINT16(DH_YLen), DH_Y:DH_YLen/binary>>,
-	       ?KEY_EXCHANGE_DHE_PSK, _) ->
-    #client_dhe_psk_identity{identity = Id, dh_public = DH_Y};
-dec_client_key(<<?UINT16(Len), Id:Len/binary, PKEPMS/binary>>,
-	       ?KEY_EXCHANGE_RSA_PSK, {3, 0}) ->
-    #client_rsa_psk_identity{identity = Id, exchange_keys = #encrypted_premaster_secret{premaster_secret = PKEPMS}};
-dec_client_key(<<?UINT16(Len), Id:Len/binary, ?UINT16(_), PKEPMS/binary>>,
-	       ?KEY_EXCHANGE_RSA_PSK, _) ->
-    #client_rsa_psk_identity{identity = Id, exchange_keys = #encrypted_premaster_secret{premaster_secret = PKEPMS}};
-dec_client_key(<<?UINT16(ALen), A:ALen/binary>>,
-	       ?KEY_EXCHANGE_SRP, _) ->
-    #client_srp_public{srp_a = A}.
-
-dec_ske_params(Len, Keys, Version) ->
-    <<Params:Len/bytes, Signature/binary>> = Keys,
-    dec_ske_signature(Params, Signature, Version).
-
-dec_ske_signature(Params, <<?BYTE(HashAlgo), ?BYTE(SignAlgo),
-			    ?UINT16(0)>>, {Major, Minor})
-  when Major == 3, Minor >= 3 ->
-    HashSign = {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)},
-    {Params, HashSign, <<>>};
-dec_ske_signature(Params, <<?BYTE(HashAlgo), ?BYTE(SignAlgo),
-			    ?UINT16(Len), Signature:Len/binary>>, {Major, Minor})
-  when Major == 3, Minor >= 3 ->
-    HashSign = {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)},
-    {Params, HashSign, Signature};
-dec_ske_signature(Params, <<>>, _) ->
-    {Params, {null, anon}, <<>>};
-dec_ske_signature(Params, <<?UINT16(0)>>, _) ->
-    {Params, {null, anon}, <<>>};
-dec_ske_signature(Params, <<?UINT16(Len), Signature:Len/binary>>, _) ->
-    {Params, undefined, Signature};
-dec_ske_signature(_, _, _) ->
-    throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)).
-
-dec_server_key(<<?UINT16(PLen), P:PLen/binary,
-		 ?UINT16(GLen), G:GLen/binary,
-		 ?UINT16(YLen), Y:YLen/binary, _/binary>> = KeyStruct,
-	       ?KEY_EXCHANGE_DIFFIE_HELLMAN, Version) ->
-    Params = #server_dh_params{dh_p = P, dh_g = G, dh_y = Y},
-    {BinMsg, HashSign, Signature} = dec_ske_params(PLen + GLen + YLen + 6, KeyStruct, Version),
-    #server_key_params{params = Params,
-		       params_bin = BinMsg,
-		       hashsign = HashSign,
-		       signature = Signature};
-%% ECParameters with named_curve
-%% TODO: explicit curve
-dec_server_key(<<?BYTE(?NAMED_CURVE), ?UINT16(CurveID),
-		 ?BYTE(PointLen), ECPoint:PointLen/binary,
-		 _/binary>> = KeyStruct,
-	       ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN, Version) ->
-    Params = #server_ecdh_params{curve = {namedCurve, ssl_tls1:enum_to_oid(CurveID)},
-				 public = ECPoint},
-    {BinMsg, HashSign, Signature} = dec_ske_params(PointLen + 4, KeyStruct, Version),
-    #server_key_params{params = Params,
-		       params_bin = BinMsg,
-		       hashsign = HashSign,
-		       signature = Signature};
-dec_server_key(<<?UINT16(Len), PskIdentityHint:Len/binary>> = KeyStruct,
-	       KeyExchange, Version)
-  when KeyExchange == ?KEY_EXCHANGE_PSK; KeyExchange == ?KEY_EXCHANGE_RSA_PSK ->
-    Params = #server_psk_params{
-      hint = PskIdentityHint},
-    {BinMsg, HashSign, Signature} = dec_ske_params(Len + 2, KeyStruct, Version),
-    #server_key_params{params = Params,
-		       params_bin = BinMsg,
-		       hashsign = HashSign,
-		       signature = Signature};
-dec_server_key(<<?UINT16(Len), IdentityHint:Len/binary,
-		 ?UINT16(PLen), P:PLen/binary,
-		 ?UINT16(GLen), G:GLen/binary,
-		 ?UINT16(YLen), Y:YLen/binary, _/binary>> = KeyStruct,
-	       ?KEY_EXCHANGE_DHE_PSK, Version) ->
-    DHParams = #server_dh_params{dh_p = P, dh_g = G, dh_y = Y},
-    Params = #server_dhe_psk_params{
-      hint = IdentityHint,
-      dh_params = DHParams},
-    {BinMsg, HashSign, Signature} = dec_ske_params(Len + PLen + GLen + YLen + 8, KeyStruct, Version),
-    #server_key_params{params = Params,
-		       params_bin = BinMsg,
-		       hashsign = HashSign,
-		       signature = Signature};
-dec_server_key(<<?UINT16(NLen), N:NLen/binary,
-		 ?UINT16(GLen), G:GLen/binary,
-		 ?BYTE(SLen), S:SLen/binary,
-		 ?UINT16(BLen), B:BLen/binary, _/binary>> = KeyStruct,
-	       ?KEY_EXCHANGE_SRP, Version) ->
-    Params = #server_srp_params{srp_n = N, srp_g = G, srp_s = S, srp_b = B},
-    {BinMsg, HashSign, Signature} = dec_ske_params(NLen + GLen + SLen + BLen + 7, KeyStruct, Version),
-    #server_key_params{params = Params,
-		       params_bin = BinMsg,
-		       hashsign = HashSign,
-		       signature = Signature};
-dec_server_key(_, _, _) ->
-    throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)).
-
-dec_hello_extensions(<<>>) ->
-    [];
-dec_hello_extensions(<<?UINT16(ExtLen), Extensions:ExtLen/binary>>) ->
-    dec_hello_extensions(Extensions, []);
-dec_hello_extensions(_) ->
-    [].
-
-dec_hello_extensions(<<>>, Acc) ->
-    Acc;
-dec_hello_extensions(<<?UINT16(?NEXTPROTONEG_EXT), ?UINT16(Len), ExtensionData:Len/binary, Rest/binary>>, Acc) ->
-    Prop = {next_protocol_negotiation, #next_protocol_negotiation{extension_data = ExtensionData}},
-    dec_hello_extensions(Rest, [Prop | Acc]);
-dec_hello_extensions(<<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info:Len/binary, Rest/binary>>, Acc) ->
-    RenegotiateInfo = case Len of
-			  1 ->  % Initial handshake
-			      Info; % should be <<0>> will be matched in handle_renegotiation_info
-			  _ ->
-			      VerifyLen = Len - 1,
-			      <<?BYTE(VerifyLen), VerifyInfo/binary>> = Info,
-			      VerifyInfo
-		      end,	    
-    dec_hello_extensions(Rest, [{renegotiation_info, 
-			   #renegotiation_info{renegotiated_connection = RenegotiateInfo}} | Acc]);
-
-dec_hello_extensions(<<?UINT16(?SRP_EXT), ?UINT16(Len), ?BYTE(SRPLen), SRP:SRPLen/binary, Rest/binary>>, Acc)
-  when Len == SRPLen + 2 ->
-    dec_hello_extensions(Rest, [{srp,
-			   #srp{username = SRP}} | Acc]);
-
-dec_hello_extensions(<<?UINT16(?SIGNATURE_ALGORITHMS_EXT), ?UINT16(Len),
-		       ExtData:Len/binary, Rest/binary>>, Acc) ->
-    SignAlgoListLen = Len - 2,
-    <<?UINT16(SignAlgoListLen), SignAlgoList/binary>> = ExtData,
-    HashSignAlgos = [{ssl_cipher:hash_algorithm(Hash), ssl_cipher:sign_algorithm(Sign)} ||
-			<<?BYTE(Hash), ?BYTE(Sign)>> <= SignAlgoList],
-    dec_hello_extensions(Rest, [{hash_signs,
-				 #hash_sign_algos{hash_sign_algos = HashSignAlgos}} | Acc]);
-
-dec_hello_extensions(<<?UINT16(?ELLIPTIC_CURVES_EXT), ?UINT16(Len),
-		       ExtData:Len/binary, Rest/binary>>, Acc) ->
-    EllipticCurveListLen = Len - 2,
-    <<?UINT16(EllipticCurveListLen), EllipticCurveList/binary>> = ExtData,
-    EllipticCurves = [ssl_tls1:enum_to_oid(X) || <<X:16>> <= EllipticCurveList],
-    dec_hello_extensions(Rest, [{elliptic_curves,
-				 #elliptic_curves{elliptic_curve_list = EllipticCurves}} | Acc]);
-
-dec_hello_extensions(<<?UINT16(?EC_POINT_FORMATS_EXT), ?UINT16(Len),
-		       ExtData:Len/binary, Rest/binary>>, Acc) ->
-    ECPointFormatListLen = Len - 1,
-    <<?BYTE(ECPointFormatListLen), ECPointFormatList/binary>> = ExtData,
-    ECPointFormats = binary_to_list(ECPointFormatList),
-    dec_hello_extensions(Rest, [{ec_point_formats,
-				 #ec_point_formats{ec_point_format_list = ECPointFormats}} | Acc]);
-
-%% Ignore data following the ClientHello (i.e.,
-%% extensions) if not understood.
-
-dec_hello_extensions(<<?UINT16(_), ?UINT16(Len), _Unknown:Len/binary, Rest/binary>>, Acc) ->
-    dec_hello_extensions(Rest, Acc);
-%% This theoretically should not happen if the protocol is followed, but if it does it is ignored.
-dec_hello_extensions(_, Acc) ->
-    Acc.
-
-encrypted_premaster_secret(Secret, RSAPublicKey) -> 
-    try 
-	PreMasterSecret = public_key:encrypt_public(Secret, RSAPublicKey, 
-						    [{rsa_pad, 
-						      rsa_pkcs1_padding}]),
-	#encrypted_premaster_secret{premaster_secret = PreMasterSecret}
-    catch
-	_:_->
-	    throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE))
-    end.
-
-%% encode/decode stream of certificate data to/from list of certificate data 
-certs_to_list(ASN1Certs) ->
-    certs_to_list(ASN1Certs, []).
-
-certs_to_list(<<?UINT24(CertLen), Cert:CertLen/binary, Rest/binary>>, Acc) ->
-    certs_to_list(Rest, [Cert | Acc]);
-certs_to_list(<<>>, Acc) ->
-    lists:reverse(Acc, []).
-
-certs_from_list(ACList) ->
-    list_to_binary([begin
-			CertLen = byte_size(Cert),
-                        <<?UINT24(CertLen), Cert/binary>>
-		    end || Cert <- ACList]).
-
-enc_hs(#next_protocol{selected_protocol = SelectedProtocol}, _Version) ->
-    PaddingLength = 32 - ((byte_size(SelectedProtocol) + 2) rem 32),
-
-    {?NEXT_PROTOCOL, <<?BYTE((byte_size(SelectedProtocol))), SelectedProtocol/binary,
-                         ?BYTE(PaddingLength), 0:(PaddingLength * 8)>>};
-enc_hs(#hello_request{}, _Version) ->
-    {?HELLO_REQUEST, <<>>};
-enc_hs(#client_hello{client_version = {Major, Minor},
-		     random = Random,
-		     session_id = SessionID,
-		     cipher_suites = CipherSuites,
-		     compression_methods = CompMethods, 
-		     renegotiation_info = RenegotiationInfo,
-		     srp = SRP,
-		     hash_signs = HashSigns,
-		     ec_point_formats = EcPointFormats,
-		     elliptic_curves = EllipticCurves,
-		     next_protocol_negotiation = NextProtocolNegotiation}, _Version) ->
-    SIDLength = byte_size(SessionID),
-    BinCompMethods = list_to_binary(CompMethods),
-    CmLength = byte_size(BinCompMethods),
-    BinCipherSuites = list_to_binary(CipherSuites),
-    CsLength = byte_size(BinCipherSuites),
-    Extensions0 = hello_extensions(RenegotiationInfo, SRP, NextProtocolNegotiation)
-	++ ec_hello_extensions(lists:map(fun ssl_cipher:suite_definition/1, CipherSuites), EcPointFormats)
-	++ ec_hello_extensions(lists:map(fun ssl_cipher:suite_definition/1, CipherSuites), EllipticCurves),
-    Extensions1 = if
-		      Major == 3, Minor >=3 -> Extensions0 ++ hello_extensions(HashSigns);
-		      true -> Extensions0
-		  end,
-    ExtensionsBin = enc_hello_extensions(Extensions1),
-
- {?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
-		     ?BYTE(SIDLength), SessionID/binary,
-		     ?UINT16(CsLength), BinCipherSuites/binary,
-		     ?BYTE(CmLength), BinCompMethods/binary, ExtensionsBin/binary>>};
-
-enc_hs(#server_hello{server_version = {Major, Minor},
-		     random = Random,
-		     session_id = Session_ID,
-		     cipher_suite = CipherSuite,
-		     compression_method = Comp_method,
-		     renegotiation_info = RenegotiationInfo,
-		     ec_point_formats = EcPointFormats,
-		     elliptic_curves = EllipticCurves,
-		     next_protocol_negotiation = NextProtocolNegotiation}, _Version) ->
-    SID_length = byte_size(Session_ID),
-    CipherSuites = [ssl_cipher:suite_definition(CipherSuite)],
-    Extensions  = hello_extensions(RenegotiationInfo, NextProtocolNegotiation)
-	++ ec_hello_extensions(CipherSuites, EcPointFormats)
-	++ ec_hello_extensions(CipherSuites, EllipticCurves),
-    ExtensionsBin = enc_hello_extensions(Extensions),
-    {?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
-		     ?BYTE(SID_length), Session_ID/binary,
-                     CipherSuite/binary, ?BYTE(Comp_method), ExtensionsBin/binary>>};
-enc_hs(#certificate{asn1_certificates = ASN1CertList}, _Version) ->
-    ASN1Certs = certs_from_list(ASN1CertList),
-    ACLen = erlang:iolist_size(ASN1Certs),
-    {?CERTIFICATE, <<?UINT24(ACLen), ASN1Certs:ACLen/binary>>};
-enc_hs(#server_key_exchange{exchange_keys = Keys}, _Version) ->
-    {?SERVER_KEY_EXCHANGE, Keys};
-enc_hs(#server_key_params{params_bin = Keys, hashsign = HashSign,
-			  signature = Signature}, Version) ->
-    EncSign = enc_sign(HashSign, Signature, Version),
-    {?SERVER_KEY_EXCHANGE, <<Keys/binary, EncSign/binary>>};
-enc_hs(#certificate_request{certificate_types = CertTypes,
-			    hashsign_algorithms = #hash_sign_algos{hash_sign_algos = HashSignAlgos},
-			    certificate_authorities = CertAuths},
-       {Major, Minor})
-  when Major == 3, Minor >= 3 ->
-    HashSigns= << <<(ssl_cipher:hash_algorithm(Hash)):8, (ssl_cipher:sign_algorithm(Sign)):8>> ||
-		   {Hash, Sign} <- HashSignAlgos >>,
-    CertTypesLen = byte_size(CertTypes),
-    HashSignsLen = byte_size(HashSigns),
-    CertAuthsLen = byte_size(CertAuths),
-    {?CERTIFICATE_REQUEST,
-       <<?BYTE(CertTypesLen), CertTypes/binary,
-	?UINT16(HashSignsLen), HashSigns/binary,
-	?UINT16(CertAuthsLen), CertAuths/binary>>
-    };
-enc_hs(#certificate_request{certificate_types = CertTypes,
-			    certificate_authorities = CertAuths}, 
-       _Version) ->
-    CertTypesLen = byte_size(CertTypes),
-    CertAuthsLen = byte_size(CertAuths),
-    {?CERTIFICATE_REQUEST,
-       <<?BYTE(CertTypesLen), CertTypes/binary,
-	?UINT16(CertAuthsLen), CertAuths/binary>>
-    };
-enc_hs(#server_hello_done{}, _Version) ->
-    {?SERVER_HELLO_DONE, <<>>};
-enc_hs(#client_key_exchange{exchange_keys = ExchangeKeys}, Version) ->
-    {?CLIENT_KEY_EXCHANGE, enc_cke(ExchangeKeys, Version)};
-enc_hs(#certificate_verify{signature = BinSig, hashsign_algorithm = HashSign}, Version) ->
-    EncSig = enc_sign(HashSign, BinSig, Version),
-    {?CERTIFICATE_VERIFY, EncSig};
-enc_hs(#finished{verify_data = VerifyData}, _Version) ->
-    {?FINISHED, VerifyData}.
-
-enc_cke(#encrypted_premaster_secret{premaster_secret = PKEPMS},{3, 0}) ->
-    PKEPMS;
-enc_cke(#encrypted_premaster_secret{premaster_secret = PKEPMS}, _) ->
-    PKEPMSLen = byte_size(PKEPMS),
-    <<?UINT16(PKEPMSLen), PKEPMS/binary>>;
-enc_cke(#client_diffie_hellman_public{dh_public = DHPublic}, _) ->
-    Len = byte_size(DHPublic),
-    <<?UINT16(Len), DHPublic/binary>>;
-enc_cke(#client_ec_diffie_hellman_public{dh_public = DHPublic}, _) ->
-    Len = byte_size(DHPublic),
-    <<?BYTE(Len), DHPublic/binary>>;
-enc_cke(#client_psk_identity{identity = undefined}, _) ->
-    Id = <<"psk_identity">>,
-    Len = byte_size(Id),
-    <<?UINT16(Len), Id/binary>>;
-enc_cke(#client_psk_identity{identity = Id}, _) ->
-    Len = byte_size(Id),
-    <<?UINT16(Len), Id/binary>>;
-enc_cke(Identity = #client_dhe_psk_identity{identity = undefined}, Version) ->
-    enc_cke(Identity#client_dhe_psk_identity{identity = <<"psk_identity">>}, Version);
-enc_cke(#client_dhe_psk_identity{identity = Id, dh_public = DHPublic}, _) ->
-    Len = byte_size(Id),
-    DHLen = byte_size(DHPublic),
-    <<?UINT16(Len), Id/binary, ?UINT16(DHLen), DHPublic/binary>>;
-enc_cke(Identity = #client_rsa_psk_identity{identity = undefined}, Version) ->
-    enc_cke(Identity#client_rsa_psk_identity{identity = <<"psk_identity">>}, Version);
-enc_cke(#client_rsa_psk_identity{identity = Id, exchange_keys = ExchangeKeys}, Version) ->
-    EncPMS = enc_cke(ExchangeKeys, Version),
-    Len = byte_size(Id),
-    <<?UINT16(Len), Id/binary, EncPMS/binary>>;
-enc_cke(#client_srp_public{srp_a = A}, _) ->
-    Len = byte_size(A),
-    <<?UINT16(Len), A/binary>>.
-
-enc_server_key(#server_dh_params{dh_p = P, dh_g = G, dh_y = Y}) ->
-    PLen = byte_size(P),
-    GLen = byte_size(G),
-    YLen = byte_size(Y),
-    <<?UINT16(PLen), P/binary, ?UINT16(GLen), G/binary, ?UINT16(YLen), Y/binary>>;
-enc_server_key(#server_ecdh_params{curve = {namedCurve, ECCurve}, public = ECPubKey}) ->
-    %%TODO: support arbitrary keys
-    KLen = size(ECPubKey),
-    <<?BYTE(?NAMED_CURVE_TYPE), ?UINT16((ssl_tls1:oid_to_enum(ECCurve))),
-      ?BYTE(KLen), ECPubKey/binary>>;
-enc_server_key(#server_psk_params{hint = PskIdentityHint}) ->
-    Len = byte_size(PskIdentityHint),
-    <<?UINT16(Len), PskIdentityHint/binary>>;
-enc_server_key(Params = #server_dhe_psk_params{hint = undefined}) ->
-    enc_server_key(Params#server_dhe_psk_params{hint = <<>>});
-enc_server_key(#server_dhe_psk_params{
-		  hint = PskIdentityHint,
-		  dh_params = #server_dh_params{dh_p = P, dh_g = G, dh_y = Y}}) ->
-    Len = byte_size(PskIdentityHint),
-    PLen = byte_size(P),
-    GLen = byte_size(G),
-    YLen = byte_size(Y),
-    <<?UINT16(Len), PskIdentityHint/binary,
-      ?UINT16(PLen), P/binary, ?UINT16(GLen), G/binary, ?UINT16(YLen), Y/binary>>;
-enc_server_key(#server_srp_params{srp_n = N, srp_g = G,	srp_s = S, srp_b = B}) ->
-    NLen = byte_size(N),
-    GLen = byte_size(G),
-    SLen = byte_size(S),
-    BLen = byte_size(B),
-    <<?UINT16(NLen), N/binary, ?UINT16(GLen), G/binary,
-      ?BYTE(SLen), S/binary, ?UINT16(BLen), B/binary>>.
-
-enc_sign({_, anon}, _Sign, _Version) ->
-    <<>>;
-enc_sign({HashAlg, SignAlg}, Signature, _Version = {Major, Minor})
-  when Major == 3, Minor >= 3->
-	SignLen = byte_size(Signature),
-	HashSign = hashsign_enc(HashAlg, SignAlg),
-	<<HashSign/binary, ?UINT16(SignLen), Signature/binary>>;
-enc_sign(_HashSign, Sign, _Version) ->
-	SignLen = byte_size(Sign),
-	<<?UINT16(SignLen), Sign/binary>>.
-
-
-ec_hello_extensions(CipherSuites, #elliptic_curves{} = Info) ->
-    case advertises_ec_ciphers(CipherSuites) of
-	true ->
-	    [Info];
-	false ->
-	    []
-    end;
-ec_hello_extensions(CipherSuites, #ec_point_formats{} = Info) ->
-    case advertises_ec_ciphers(CipherSuites) of
-	true ->
-	    [Info];
-	false ->
-	    []
-    end;
-ec_hello_extensions(_, undefined) ->
-    [].
-
-hello_extensions(RenegotiationInfo, NextProtocolNegotiation) ->
-    hello_extensions(RenegotiationInfo) ++ next_protocol_extension(NextProtocolNegotiation).
-
-hello_extensions(RenegotiationInfo, SRP, NextProtocolNegotiation) ->
-    hello_extensions(RenegotiationInfo)
-	++ hello_extensions(SRP)
-	++ next_protocol_extension(NextProtocolNegotiation).
-
-advertises_ec_ciphers([]) ->
-    false;
-advertises_ec_ciphers([{ecdh_ecdsa, _,_,_} | _]) ->
-    true;
-advertises_ec_ciphers([{ecdhe_ecdsa, _,_,_} | _]) ->
-    true;
-advertises_ec_ciphers([{ecdh_rsa, _,_,_} | _]) ->
-    true;
-advertises_ec_ciphers([{ecdhe_rsa, _,_,_} | _]) ->
-    true;
-advertises_ec_ciphers([{ecdh_anon, _,_,_} | _]) ->
-    true;
-advertises_ec_ciphers([_| Rest]) ->
-    advertises_ec_ciphers(Rest).
-
-%% Renegotiation info
-hello_extensions(#renegotiation_info{renegotiated_connection = undefined}) ->
-    [];
-hello_extensions(#renegotiation_info{} = Info) ->
-    [Info];
-hello_extensions(#srp{} = Info) ->
-    [Info];
-hello_extensions(#hash_sign_algos{} = Info) ->
-    [Info];
-hello_extensions(undefined) ->
-    [].
-
-next_protocol_extension(undefined) ->
-    [];
-next_protocol_extension(#next_protocol_negotiation{} = Info) ->
-    [Info].
-
-enc_hello_extensions(Extensions) ->
-    enc_hello_extensions(Extensions, <<>>).
-enc_hello_extensions([], <<>>) ->
-    <<>>;
-enc_hello_extensions([], Acc) ->
-    Size = byte_size(Acc),
-    <<?UINT16(Size), Acc/binary>>;
-
-enc_hello_extensions([#next_protocol_negotiation{extension_data = ExtensionData} | Rest], Acc) ->
-    Len = byte_size(ExtensionData),
-    enc_hello_extensions(Rest, <<?UINT16(?NEXTPROTONEG_EXT), ?UINT16(Len), ExtensionData/binary, Acc/binary>>);
-enc_hello_extensions([#renegotiation_info{renegotiated_connection = ?byte(0) = Info} | Rest], Acc) ->
-    Len = byte_size(Info),
-    enc_hello_extensions(Rest, <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info/binary, Acc/binary>>);
-
-enc_hello_extensions([#renegotiation_info{renegotiated_connection = Info} | Rest], Acc) ->
-    InfoLen = byte_size(Info),
-    Len = InfoLen +1,
-    enc_hello_extensions(Rest, <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), ?BYTE(InfoLen), Info/binary, Acc/binary>>);
-enc_hello_extensions([#elliptic_curves{elliptic_curve_list = EllipticCurves} | Rest], Acc) ->
-    EllipticCurveList = << <<(ssl_tls1:oid_to_enum(X)):16>> || X <- EllipticCurves>>,
-    ListLen = byte_size(EllipticCurveList),
-    Len = ListLen + 2,
-    enc_hello_extensions(Rest, <<?UINT16(?ELLIPTIC_CURVES_EXT),
-				 ?UINT16(Len), ?UINT16(ListLen), EllipticCurveList/binary, Acc/binary>>);
-enc_hello_extensions([#ec_point_formats{ec_point_format_list = ECPointFormats} | Rest], Acc) ->
-    ECPointFormatList = list_to_binary(ECPointFormats),
-    ListLen = byte_size(ECPointFormatList),
-    Len = ListLen + 1,
-    enc_hello_extensions(Rest, <<?UINT16(?EC_POINT_FORMATS_EXT),
-				 ?UINT16(Len), ?BYTE(ListLen), ECPointFormatList/binary, Acc/binary>>);
-enc_hello_extensions([#srp{username = UserName} | Rest], Acc) ->
-    SRPLen = byte_size(UserName),
-    Len = SRPLen + 2,
-    enc_hello_extensions(Rest, <<?UINT16(?SRP_EXT), ?UINT16(Len), ?BYTE(SRPLen), UserName/binary, Acc/binary>>);
-enc_hello_extensions([#hash_sign_algos{hash_sign_algos = HashSignAlgos} | Rest], Acc) ->
-    SignAlgoList = << <<(ssl_cipher:hash_algorithm(Hash)):8, (ssl_cipher:sign_algorithm(Sign)):8>> ||
-		       {Hash, Sign} <- HashSignAlgos >>,
-    ListLen = byte_size(SignAlgoList),
-    Len = ListLen + 2,
-    enc_hello_extensions(Rest, <<?UINT16(?SIGNATURE_ALGORITHMS_EXT), 
-				 ?UINT16(Len), ?UINT16(ListLen), SignAlgoList/binary, Acc/binary>>).
-
-encode_client_protocol_negotiation(undefined, _) ->
-    undefined;
-encode_client_protocol_negotiation(_, false) ->
-	#next_protocol_negotiation{extension_data = <<>>};
-encode_client_protocol_negotiation(_, _) ->
-	undefined.
-
-from_3bytes(Bin3) ->
-    from_3bytes(Bin3, []).
-
-from_3bytes(<<>>, Acc) ->
-    lists:reverse(Acc);
-from_3bytes(<<?UINT24(N), Rest/binary>>, Acc) ->
-    from_3bytes(Rest, [?uint16(N) | Acc]).
-
-from_2bytes(Bin2) ->
-    from_2bytes(Bin2, []).
-
-from_2bytes(<<>>, Acc) ->
-    lists:reverse(Acc);
-from_2bytes(<<?UINT16(N), Rest/binary>>, Acc) ->
-    from_2bytes(Rest, [?uint16(N) | Acc]).
-
-certificate_types({KeyExchange, _, _, _})  
-  when KeyExchange == rsa;
-       KeyExchange == dhe_dss;
-       KeyExchange == dhe_rsa;
-       KeyExchange == ecdhe_rsa ->
-    <<?BYTE(?RSA_SIGN), ?BYTE(?DSS_SIGN)>>;
-
-certificate_types({KeyExchange, _, _, _})
-  when KeyExchange == dh_ecdsa;
-       KeyExchange == dhe_ecdsa ->
-    <<?BYTE(?ECDSA_SIGN)>>;
-
-certificate_types(_) ->
-    <<?BYTE(?RSA_SIGN)>>.
-
-hashsign_dec(<<?BYTE(HashAlgo), ?BYTE(SignAlgo)>>) ->
-    {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)}.
-
-hashsign_enc(HashAlgo, SignAlgo) ->
-    Hash = ssl_cipher:hash_algorithm(HashAlgo),
-    Sign = ssl_cipher:sign_algorithm(SignAlgo),
-    <<?BYTE(Hash), ?BYTE(Sign)>>.
-
-certificate_authorities(CertDbHandle, CertDbRef) ->
-    Authorities = certificate_authorities_from_db(CertDbHandle, CertDbRef),
-    Enc = fun(#'OTPCertificate'{tbsCertificate=TBSCert}) ->
-		  OTPSubj = TBSCert#'OTPTBSCertificate'.subject,
-		  DNEncodedBin = public_key:pkix_encode('Name', OTPSubj, otp),
-		  DNEncodedLen = byte_size(DNEncodedBin),
-		  <<?UINT16(DNEncodedLen), DNEncodedBin/binary>>
-	  end,
-    list_to_binary([Enc(Cert) || {_, Cert} <- Authorities]).
-
-certificate_authorities_from_db(CertDbHandle, CertDbRef) ->
-    ConnectionCerts = fun({{Ref, _, _}, Cert}, Acc) when Ref  == CertDbRef ->
-			      [Cert | Acc];
-			 (_, Acc) ->
-			      Acc
-		      end,
-    ssl_pkix_db:foldl(ConnectionCerts, [], CertDbHandle).
-
-
-digitally_signed({3, Minor}, Hash, HashAlgo, Key) when Minor >= 3 ->
-    public_key:sign({digest, Hash}, HashAlgo, Key);
-digitally_signed(_Version, Hash, HashAlgo, #'DSAPrivateKey'{} = Key) ->
-    public_key:sign({digest, Hash}, HashAlgo, Key);
-digitally_signed(_Version, Hash, _HashAlgo, #'RSAPrivateKey'{} = Key) ->
-    public_key:encrypt_private(Hash, Key,
-			       [{rsa_pad, rsa_pkcs1_padding}]);
-digitally_signed(_Version, Hash, HashAlgo, Key) ->
-    public_key:sign({digest, Hash}, HashAlgo, Key).
-
-calc_master_secret({3,0}, _PrfAlgo, PremasterSecret, ClientRandom, ServerRandom) ->
-    ssl_ssl3:master_secret(PremasterSecret, ClientRandom, ServerRandom);
-
-calc_master_secret({3,_}, PrfAlgo, PremasterSecret, ClientRandom, ServerRandom) ->
-    ssl_tls1:master_secret(PrfAlgo, PremasterSecret, ClientRandom, ServerRandom).
-
-setup_keys({3,0}, _PrfAlgo, MasterSecret,
-	   ServerRandom, ClientRandom, HashSize, KML, EKML, IVS) ->
-    ssl_ssl3:setup_keys(MasterSecret, ServerRandom,
-			ClientRandom, HashSize, KML, EKML, IVS);
-
-setup_keys({3,N}, PrfAlgo, MasterSecret,
-	   ServerRandom, ClientRandom, HashSize, KML, _EKML, IVS) ->
-    ssl_tls1:setup_keys(N, PrfAlgo, MasterSecret, ServerRandom, ClientRandom, HashSize,
-			KML, IVS).
-
-calc_finished({3, 0}, Role, _PrfAlgo, MasterSecret, Handshake) ->
-    ssl_ssl3:finished(Role, MasterSecret, lists:reverse(Handshake));
-calc_finished({3, N}, Role, PrfAlgo, MasterSecret, Handshake) ->
-    ssl_tls1:finished(Role, N, PrfAlgo, MasterSecret, lists:reverse(Handshake)).
-
-calc_certificate_verify({3, 0}, HashAlgo, MasterSecret, Handshake) ->
-    ssl_ssl3:certificate_verify(HashAlgo, MasterSecret, lists:reverse(Handshake));
-calc_certificate_verify({3, N}, HashAlgo, _MasterSecret, Handshake) ->
-    ssl_tls1:certificate_verify(HashAlgo, N, lists:reverse(Handshake)).
-
-key_exchange_alg(rsa) ->
-    ?KEY_EXCHANGE_RSA;
-key_exchange_alg(Alg) when Alg == dhe_rsa; Alg == dhe_dss;
-			    Alg == dh_dss; Alg == dh_rsa; Alg == dh_anon ->
-    ?KEY_EXCHANGE_DIFFIE_HELLMAN;
-key_exchange_alg(Alg) when Alg == ecdhe_rsa; Alg == ecdh_rsa;
-			   Alg == ecdhe_ecdsa; Alg == ecdh_ecdsa;
-			   Alg == ecdh_anon ->
-    ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN;
-key_exchange_alg(psk) ->
-    ?KEY_EXCHANGE_PSK;
-key_exchange_alg(dhe_psk) ->
-    ?KEY_EXCHANGE_DHE_PSK;
-key_exchange_alg(rsa_psk) ->
-    ?KEY_EXCHANGE_RSA_PSK;
-key_exchange_alg(Alg)
-  when Alg == srp_rsa; Alg == srp_dss; Alg == srp_anon ->
-    ?KEY_EXCHANGE_SRP;
-key_exchange_alg(_) ->
-    ?NULL.
-
-apply_user_fun(Fun, OtpCert, ExtensionOrError, UserState0, SslState) ->
-    case Fun(OtpCert, ExtensionOrError, UserState0) of
-	{valid, UserState} ->
-	    {valid, {SslState, UserState}};
-	{fail, _} = Fail ->
-	    Fail;
-	{unknown, UserState} ->
-	    {unknown, {SslState, UserState}}
-    end.
-
--define(TLSEXT_SIGALG_RSA(MD), {MD, rsa}).
--define(TLSEXT_SIGALG_DSA(MD), {MD, dsa}).
--define(TLSEXT_SIGALG_ECDSA(MD), {MD, ecdsa}).
-
--define(TLSEXT_SIGALG(MD), ?TLSEXT_SIGALG_ECDSA(MD), ?TLSEXT_SIGALG_RSA(MD)).
-
-default_hash_signs() ->
-    HashSigns = [?TLSEXT_SIGALG(sha512),
-		 ?TLSEXT_SIGALG(sha384),
-		 ?TLSEXT_SIGALG(sha256),
-		 ?TLSEXT_SIGALG(sha224),
-		 ?TLSEXT_SIGALG(sha),
-		 ?TLSEXT_SIGALG_DSA(sha),
-		 ?TLSEXT_SIGALG_RSA(md5)],
-    CryptoSupport = proplists:get_value(public_keys, crypto:supports()),
-    HasECC = proplists:get_bool(ecdsa, CryptoSupport),
-    #hash_sign_algos{hash_sign_algos =
-			 lists:filter(fun({_, ecdsa}) -> HasECC;
-					 (_) -> true end, HashSigns)}.
-
-handle_hello_extensions(#client_hello{random = Random,
-				      cipher_suites = CipherSuites,
-				      renegotiation_info = Info,
-				      srp = SRP,
-				      ec_point_formats = EcPointFormats0,
-				      elliptic_curves = EllipticCurves0} = Hello, Version,
-			#ssl_options{secure_renegotiate = SecureRenegotation} = Opts,
-			Session0, ConnectionStates0, Renegotiation) ->
-    Session = handle_srp_extension(SRP, Session0),
-    ConnectionStates = handle_renegotiation_extension(Version, Info, Random, Session, ConnectionStates0,
-						      Renegotiation, SecureRenegotation, CipherSuites),
-    ProtocolsToAdvertise = handle_next_protocol_extension(Hello, Renegotiation, Opts),
-    {EcPointFormats, EllipticCurves} = handle_ecc_extensions(Version, EcPointFormats0, EllipticCurves0),
-    %%TODO make extensions compund data structure
-    {Session, ConnectionStates, ProtocolsToAdvertise, EcPointFormats, EllipticCurves}.
-
-
-handle_renegotiation_extension(Version, Info, Random, #session{cipher_suite = CipherSuite,
-							       compression_method = Compression},
-			       ConnectionStates0, Renegotiation, SecureRenegotation, CipherSuites) ->
-    case handle_renegotiation_info(server, Info, ConnectionStates0,
-				   Renegotiation, SecureRenegotation,
-				   CipherSuites) of
-	{ok, ConnectionStates1} ->
-	    hello_pending_connection_states(server,
-					    Version,
-					    CipherSuite,
-					    Random,
-					    Compression,
-					    ConnectionStates1);
-	#alert{} = Alert ->
-	    throw(Alert)
-    end.
-
-handle_next_protocol_extension(Hello, Renegotiation, SslOpts)->
-    case handle_next_protocol_on_server(Hello, Renegotiation, SslOpts) of
-	#alert{} = Alert ->
-	    throw(Alert);
-	ProtocolsToAdvertise ->
-	    ProtocolsToAdvertise
-    end.
-
-handle_srp_extension(undefined, Session) ->
-    Session;
-handle_srp_extension(#srp{username = Username}, Session) ->
-    Session#session{srp_username = Username}.
-
-int_to_bin(I) ->
-    L = (length(integer_to_list(I, 16)) + 1) div 2,
-    <<I:(L*8)>>.