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// Copyright 2019 Google LLC
//
// 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
//
// http://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 "tink/keyderivation/keyset_deriver_wrapper.h"
#include <memory>
#include <utility>
#include "absl/status/status.h"
#include "tink/cleartext_keyset_handle.h"
#include "proto/tink.pb.h"
namespace crypto {
namespace tink {
namespace {
using ::google::crypto::tink::KeyData;
using ::google::crypto::tink::Keyset;
util::Status Validate(PrimitiveSet<KeysetDeriver>* deriver_set) {
if (deriver_set == nullptr) {
return util::Status(absl::StatusCode::kInternal,
"deriver_set must be non-NULL");
}
if (deriver_set->get_primary() == nullptr) {
return util::Status(absl::StatusCode::kInvalidArgument,
"deriver_set has no primary");
}
return util::OkStatus();
}
class KeysetDeriverSetWrapper : public KeysetDeriver {
public:
explicit KeysetDeriverSetWrapper(
std::unique_ptr<PrimitiveSet<KeysetDeriver>> deriver_set)
: deriver_set_(std::move(deriver_set)) {}
crypto::tink::util::StatusOr<std::unique_ptr<KeysetHandle>> DeriveKeyset(
absl::string_view salt) const override;
~KeysetDeriverSetWrapper() override = default;
private:
std::unique_ptr<PrimitiveSet<KeysetDeriver>> deriver_set_;
};
crypto::tink::util::StatusOr<KeyData> DeriveAndGetKeyData(
absl::string_view salt, const KeysetDeriver& deriver) {
auto keyset_handle_or = deriver.DeriveKeyset(salt);
if (!keyset_handle_or.ok()) return keyset_handle_or.status();
const Keyset& keyset =
CleartextKeysetHandle::GetKeyset(*keyset_handle_or.value());
if (keyset.key_size() != 1) {
return util::Status(
absl::StatusCode::kInternal,
"Wrapper Deriver must create a keyset with exactly one KeyData");
}
return keyset.key(0).key_data();
}
crypto::tink::util::StatusOr<std::unique_ptr<KeysetHandle>>
KeysetDeriverSetWrapper::DeriveKeyset(absl::string_view salt) const {
Keyset keyset;
for (const auto* entry : deriver_set_->get_all_in_keyset_order()) {
Keyset::Key* key = keyset.add_key();
crypto::tink::util::StatusOr<KeyData> key_data_or =
DeriveAndGetKeyData(salt, entry->get_primitive());
if (!key_data_or.ok()) return key_data_or.status();
*key->mutable_key_data() = key_data_or.value();
key->set_status(entry->get_status());
key->set_output_prefix_type(entry->get_output_prefix_type());
key->set_key_id(entry->get_key_id());
}
keyset.set_primary_key_id(deriver_set_->get_primary()->get_key_id());
return CleartextKeysetHandle::GetKeysetHandle(keyset);
}
} // namespace
crypto::tink::util::StatusOr<std::unique_ptr<KeysetDeriver>>
KeysetDeriverWrapper::Wrap(
std::unique_ptr<PrimitiveSet<KeysetDeriver>> deriver_set) const {
util::Status status = Validate(deriver_set.get());
if (!status.ok()) return status;
return {absl::make_unique<KeysetDeriverSetWrapper>(std::move(deriver_set))};
}
} // namespace tink
} // namespace crypto
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