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

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jose src jose_jwe_alg_rsa.erl
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src/jose_jwe_alg_rsa.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 :  22 Jul 2015 by Andrew Bennett <andrew@pixid.com>

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

-module(jose_jwe_alg_rsa).

-behaviour(jose_jwe).

-behaviour(jose_jwe_alg).



-include("jose_jwk.hrl").



%% jose_jwe callbacks

-export([from_map/1]).

-export([to_map/2]).

%% jose_jwe_alg callbacks

-export([key_decrypt/3]).

-export([key_encrypt/3]).

-export([next_cek/4]).

%% API



%% Types

-record(jose_jwe_alg_rsa, {

	padding = undefined :: undefined | rsa_pkcs1_padding | rsa_pkcs1_oaep_padding

}).



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



-export_type([alg/0]).



-define(RSA1_5,       #jose_jwe_alg_rsa{padding=rsa_pkcs1_padding}).

-define(RSA_OAEP,     #jose_jwe_alg_rsa{padding=rsa_pkcs1_oaep_padding}).

-define(RSA_OAEP_256, #jose_jwe_alg_rsa{padding=rsa_pkcs1_oaep256_padding}).



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

%% jose_jwe callbacks

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



from_map(F = #{ <<"alg">> := <<"RSA1_5">> }) ->

	{?RSA1_5, maps:remove(<<"alg">>, F)};

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

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

from_map(F = #{ <<"alg">> := <<"RSA-OAEP-256">> }) ->

	{?RSA_OAEP_256, maps:remove(<<"alg">>, F)}.



to_map(?RSA1_5, F) ->

	F#{ <<"alg">> => <<"RSA1_5">> };

to_map(?RSA_OAEP, F) ->

	F#{ <<"alg">> => <<"RSA-OAEP">> };

to_map(?RSA_OAEP_256, F) ->

	F#{ <<"alg">> => <<"RSA-OAEP-256">> }.



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

%% jose_jwe_alg callbacks

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



key_decrypt(#jose_jwk{kty={KTYModule, KTY}}, {_ENCModule, _ENC, EncryptedKey}, #jose_jwe_alg_rsa{padding=Padding}) ->

	KTYModule:private_decrypt(EncryptedKey, [{rsa_pad, Padding}], KTY).



key_encrypt(#jose_jwk{kty={KTYModule, KTY}}, DecryptedKey, JWERSA=#jose_jwe_alg_rsa{padding=Padding}) ->

	{KTYModule:public_encrypt(DecryptedKey, [{rsa_pad, Padding}], KTY), JWERSA}.



next_cek(_Key, ENCModule, ENC, #jose_jwe_alg_rsa{}) ->

	ENCModule:next_cek(ENC).



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

%% API functions

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



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

%%% Internal functions

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