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JSON Object Signing and Encryption (JOSE) for Erlang and Elixir.

Security advisory: This version has known vulnerabilities. View advisories
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jose src jose_jws_alg_ecdsa.erl
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src/jose_jws_alg_ecdsa.erl 

%% -*- mode: erlang; tab-width: 4; indent-tabs-mode: 1; st-rulers: [70] -*-

%% vim: ts=4 sw=4 ft=erlang noet

%%%-------------------------------------------------------------------

%%% @author Andrew Bennett <andrew@pixid.com>

%%% @copyright 2014-2015, Andrew Bennett

%%% @doc

%%%

%%% @end

%%% Created :  23 Jul 2015 by Andrew Bennett <andrew@pixid.com>

%%%-------------------------------------------------------------------

-module(jose_jws_alg_ecdsa).

-behaviour(jose_jws).

-behaviour(jose_jws_alg).



-include("jose_jwk.hrl").



%% jose_jws callbacks

-export([from_map/1]).

-export([to_map/2]).

%% jose_jws_alg callbacks

-export([generate_key/2]).

-export([sign/3]).

-export([verify/4]).



%% API



%% Types

-record(jose_jws_alg_ecdsa, {

	digest = undefined :: undefined | sha256 | sha384 | sha512

}).



-type alg() :: #jose_jws_alg_ecdsa{}.



-export_type([alg/0]).



-define(ES256, #jose_jws_alg_ecdsa{digest=sha256}).

-define(ES384, #jose_jws_alg_ecdsa{digest=sha384}).

-define(ES512, #jose_jws_alg_ecdsa{digest=sha512}).



%%====================================================================

%% jose_jws callbacks

%%====================================================================



from_map(F = #{ <<"alg">> := <<"ES256">> }) ->

	{?ES256, maps:remove(<<"alg">>, F)};

from_map(F = #{ <<"alg">> := <<"ES384">> }) ->

	{?ES384, maps:remove(<<"alg">>, F)};

from_map(F = #{ <<"alg">> := <<"ES512">> }) ->

	{?ES512, maps:remove(<<"alg">>, F)}.



to_map(?ES256, F) ->

	F#{ <<"alg">> => <<"ES256">> };

to_map(?ES384, F) ->

	F#{ <<"alg">> => <<"ES384">> };

to_map(?ES512, F) ->

	F#{ <<"alg">> => <<"ES512">> }.



%%====================================================================

%% jose_jws_alg callbacks

%%====================================================================



generate_key(?ES256, _Fields) ->

	jose_jws_alg:generate_key({ec, <<"P-256">>}, <<"ES256">>);

generate_key(?ES384, _Fields) ->

	jose_jws_alg:generate_key({ec, <<"P-384">>}, <<"ES384">>);

generate_key(?ES512, _Fields) ->

	jose_jws_alg:generate_key({ec, <<"P-521">>}, <<"ES512">>).



sign(#jose_jwk{kty={KTYModule, KTY}}, Message, #jose_jws_alg_ecdsa{digest=DigestType}) ->

	KTYModule:sign(Message, DigestType, KTY).



verify(#jose_jwk{kty={KTYModule, KTY}}, Message, Signature, #jose_jws_alg_ecdsa{digest=DigestType}) ->

	KTYModule:verify(Message, DigestType, Signature, KTY).



%%====================================================================

%% API functions

%%====================================================================



%%%-------------------------------------------------------------------

%%% Internal functions

%%%-------------------------------------------------------------------