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/*
* Copyright 2019 Google Inc.
* 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
*
* https://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.
*/
#include "util/ec_key_util.h"
#include "absl/strings/str_cat.h"
#include "crypto/ec_group.h"
#include "util/proto_util.h"
#include "util/recordio.h"
namespace private_join_and_compute::ec_key_util {
Status GenerateEcKey(int curve_id, absl::string_view ec_key_filename) {
Context context;
ASSIGN_OR_RETURN(ECGroup ec_group, ECGroup::Create(curve_id, &context));
BigNum key = ec_group.GeneratePrivateKey();
EcKeyProto key_proto;
key_proto.set_curve_id(curve_id);
key_proto.set_key(key.ToBytes());
return ProtoUtils::WriteProtoToFile(key_proto, ec_key_filename);
}
StatusOr<BigNum> DeserializeEcKey(Context* context, int curve_id,
EcKeyProto ec_key_proto) {
if (curve_id != ec_key_proto.curve_id()) {
return InvalidArgumentError(absl::StrCat(
"EC key conversion failed, the given curve_id ", curve_id,
" doesn't match the proto curve id ", ec_key_proto.curve_id()));
}
return context->CreateBigNum(ec_key_proto.key());
}
} // namespace private_join_and_compute::ec_key_util
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