1 /*
2 * Copyright 2019 Google LLC.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * https://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "private_join_and_compute/util/ec_key_util.h"
17
18 #include "absl/strings/str_cat.h"
19 #include "private_join_and_compute/crypto/ec_group.h"
20 #include "private_join_and_compute/util/proto_util.h"
21 #include "private_join_and_compute/util/recordio.h"
22
23 namespace private_join_and_compute::ec_key_util {
24
GenerateEcKey(int curve_id,absl::string_view ec_key_filename)25 Status GenerateEcKey(int curve_id, absl::string_view ec_key_filename) {
26 Context context;
27 ASSIGN_OR_RETURN(ECGroup ec_group, ECGroup::Create(curve_id, &context));
28 BigNum key = ec_group.GeneratePrivateKey();
29 EcKeyProto key_proto;
30 key_proto.set_curve_id(curve_id);
31 key_proto.set_key(key.ToBytes());
32 return ProtoUtils::WriteProtoToFile(key_proto, ec_key_filename);
33 }
34
DeserializeEcKey(Context * context,int curve_id,EcKeyProto ec_key_proto)35 StatusOr<BigNum> DeserializeEcKey(Context* context, int curve_id,
36 EcKeyProto ec_key_proto) {
37 if (curve_id != ec_key_proto.curve_id()) {
38 return InvalidArgumentError(absl::StrCat(
39 "EC key conversion failed, the given curve_id ", curve_id,
40 " doesn't match the proto curve id ", ec_key_proto.curve_id()));
41 }
42 return context->CreateBigNum(ec_key_proto.key());
43 }
44
45 } // namespace private_join_and_compute::ec_key_util
46