%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2013-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(dtls_v1).
-include("ssl_cipher.hrl").
-export([suites/1, all_suites/1, mac_hash/7, ecc_curves/1,
corresponding_tls_version/1, corresponding_dtls_version/1,
cookie_secret/0, cookie_timeout/0]).
-define(COOKIE_BASE_TIMEOUT, 30000).
-spec suites(Minor:: 253|255) -> [ssl_cipher:cipher_suite()].
suites(Minor) ->
lists:filter(fun(Cipher) ->
is_acceptable_cipher(ssl_cipher:suite_definition(Cipher))
end,
tls_v1:suites(corresponding_minor_tls_version(Minor))).
all_suites(Version) ->
lists:filter(fun(Cipher) ->
is_acceptable_cipher(ssl_cipher:suite_definition(Cipher))
end,
ssl_cipher:all_suites(corresponding_tls_version(Version))).
mac_hash(Version, MacAlg, MacSecret, SeqNo, Type, Length, Fragment) ->
tls_v1:mac_hash(MacAlg, MacSecret, SeqNo, Type, Version,
Length, Fragment).
ecc_curves({_Major, Minor}) ->
tls_v1:ecc_curves(corresponding_minor_tls_version(Minor)).
corresponding_tls_version({254, Minor}) ->
{3, corresponding_minor_tls_version(Minor)}.
cookie_secret() ->
crypto:strong_rand_bytes(32).
cookie_timeout() ->
%% Cookie will live for two timeouts periods
round(rand:uniform() * ?COOKIE_BASE_TIMEOUT/2).
corresponding_minor_tls_version(255) ->
2;
corresponding_minor_tls_version(253) ->
3.
corresponding_dtls_version({3, Minor}) ->
{254, corresponding_minor_dtls_version(Minor)}.
corresponding_minor_dtls_version(2) ->
255;
corresponding_minor_dtls_version(3) ->
253.
is_acceptable_cipher(Suite) ->
not ssl_cipher:is_stream_ciphersuite(Suite).
