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%%% Copyright (c) 2014, NORDUnet A/S.
%%% See LICENSE for licensing information.
%%%
%%% @doc Signing service
-module(sign).
-behaviour(gen_server).
%% API.
-export([start_link/2, stop/0]).
-export([sign/1, get_pubkey/0, get_logid/0]).
%% API for tests.
-export([read_keyfile_rsa/2, read_keyfiles_ec/2]).
%% gen_server callbacks.
-export([init/1, handle_call/3, terminate/2,
handle_cast/2, handle_info/2, code_change/3]).
-import(stacktrace, [call/2]).
-include_lib("public_key/include/public_key.hrl").
-include_lib("eunit/include/eunit.hrl").
-record(state, {pubkey :: public_key:rsa_public_key(),
privkey :: public_key:rsa_private_key(),
logid :: binary()
}).
start_link(Keyfile, Passphrase) ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [Keyfile, Passphrase], []).
stop() ->
call(?MODULE, stop).
init([PrivKeyfile, PubKeyfile]) ->
%% Read RSA keypair.
%% {Private_key, Public_key} = read_keyfile_rsa(Keyfile, Passphrase),
%% LogID = crypto:hash(sha256,
%% public_key:der_encode('RSAPublicKey', Public_key)),
%% Read EC keypair.
{Private_key, Public_key, LogID} = read_keyfiles_ec(PrivKeyfile, PubKeyfile),
_Tree = ht:reset_tree([db:size() - 1]),
{ok, #state{pubkey = Public_key,
privkey = Private_key,
logid = LogID}}.
%% TODO: Merge the keyfile reading functions.
%% @doc Read one password protected PEM file with an RSA keypair.
read_keyfile_rsa(Filename, Passphrase) ->
{ok, PemBin} = file:read_file(Filename),
[KeyPem] = public_key:pem_decode(PemBin), % Use first entry.
Privatekey = decode_key(KeyPem, Passphrase),
{Privatekey, public_key(Privatekey)}.
%% @doc Read two PEM files, one with a private EC key and one with the
%% corresponding public EC key.
read_keyfiles_ec(PrivkeyFile, Pubkeyfile) ->
{ok, PemBinPriv} = file:read_file(PrivkeyFile),
[OTPPubParamsPem, PrivkeyPem] = public_key:pem_decode(PemBinPriv),
Privatekey = decode_key(PrivkeyPem),
{_, ParamsBin, ParamsEnc} = OTPPubParamsPem,
PubParamsPem = {'EcpkParameters', ParamsBin, ParamsEnc},
Params = public_key:pem_entry_decode(PubParamsPem),
{ok, PemBinPub} = file:read_file(Pubkeyfile),
[SPKIPem] = public_key:pem_decode(PemBinPub),
%% SPKI is missing #'AlgorithmIdentifier' so pem_entry_decode won't do.
%% Publickey = public_key:pem_entry_decode(SPKIPem),
#'SubjectPublicKeyInfo'{algorithm = AlgoDer} = SPKIPem,
SPKI = public_key:der_decode('SubjectPublicKeyInfo', AlgoDer),
#'SubjectPublicKeyInfo'{subjectPublicKey = {_, Octets}} = SPKI,
Point = #'ECPoint'{point = Octets},
Publickey = {Point, Params},
KeyID = crypto:hash(sha256, AlgoDer),
{Privatekey, Publickey, KeyID}.
%% -spec signhash_rsa(iolist() | binary(), public_key:rsa_private_key()) -> binary().
%% signhash_rsa(Data, PrivKey) ->
%% %% Was going to just crypto:sign/3 the hash but looking at
%% %% digitally_signed() in lib/ssl/src/ssl_handshake.erl it seems
%% %% like we should rather use (undocumented) encrypt_private/3.
%% %public_key:sign(hash(sha256, BinToSign), sha256, PrivKey)
%% public_key:encrypt_private(crypto:hash(sha256, Data),
%% PrivKey,
%% [{rsa_pad, rsa_pkcs1_padding}]).
-spec signhash_ec(iolist() | binary(), public_key:ec_private_key()) -> binary().
signhash_ec(Data, PrivKey) ->
public_key:sign(Data, sha256, PrivKey).
decode_key(Entry) ->
public_key:pem_entry_decode(Entry).
decode_key(Entry, Passphrase) ->
public_key:pem_entry_decode(Entry, Passphrase).
public_key(#'RSAPrivateKey'{modulus = Mod, publicExponent = Exp}) ->
#'RSAPublicKey'{modulus = Mod, publicExponent = Exp}.
%%%%%%%%%%%%%%%%%%%%
%% Public API.
sign(Data) ->
call(?MODULE, {sign, Data}).
get_pubkey() ->
call(?MODULE, {get, pubkey}).
get_logid() ->
call(?MODULE, {get, logid}).
%%%%%%%%%%%%%%%%%%%%
%% gen_server callbacks.
handle_cast(_Request, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
terminate(_Reason, _State) ->
io:format("~p terminating~n", [?MODULE]),
ok.
handle_call(stop, _From, State) ->
{stop, normal, stopped, State};
handle_call({get, logid}, _From, State) ->
{reply, State#state.logid, State};
handle_call({get, pubkey}, _From, State) ->
{reply, State#state.pubkey, State};
handle_call({sign, Data}, _From, State) ->
%% FIXME: Merge RSA and DC.
{reply, signhash_ec(Data, State#state.privkey), State}.
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