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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
//
// 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.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef TINK_STREAMINGAEAD_AES_GCM_HKDF_STREAMING_KEY_MANAGER_H_
#define TINK_STREAMINGAEAD_AES_GCM_HKDF_STREAMING_KEY_MANAGER_H_
#include <memory>
#include <string>
#include <utility>
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
#include "tink/core/key_type_manager.h"
#include "tink/key_manager.h"
#include "tink/streaming_aead.h"
#include "tink/subtle/aes_gcm_hkdf_streaming.h"
#include "tink/util/constants.h"
#include "tink/util/enums.h"
#include "tink/util/errors.h"
#include "tink/util/protobuf_helper.h"
#include "tink/util/secret_data.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
#include "proto/aes_gcm_hkdf_streaming.pb.h"
#include "proto/tink.pb.h"
namespace crypto {
namespace tink {
class AesGcmHkdfStreamingKeyManager
: public KeyTypeManager<google::crypto::tink::AesGcmHkdfStreamingKey,
google::crypto::tink::AesGcmHkdfStreamingKeyFormat,
List<StreamingAead>> {
public:
class AesGcmHkdfStreamingKeyManagerFactory
: public PrimitiveFactory<StreamingAead> {
crypto::tink::util::StatusOr<std::unique_ptr<StreamingAead>> Create(
const google::crypto::tink::AesGcmHkdfStreamingKey& key)
const override {
subtle::AesGcmHkdfStreaming::Params params;
params.ikm = util::SecretDataFromStringView(key.key_value());
params.hkdf_hash = crypto::tink::util::Enums::ProtoToSubtle(
key.params().hkdf_hash_type());
params.derived_key_size = key.params().derived_key_size();
params.ciphertext_segment_size = key.params().ciphertext_segment_size();
params.ciphertext_offset = 0;
auto streaming_result =
subtle::AesGcmHkdfStreaming::New(std::move(params));
if (!streaming_result.ok()) return streaming_result.status();
return {std::move(streaming_result.value())};
}
};
AesGcmHkdfStreamingKeyManager()
: KeyTypeManager(
absl::make_unique<AesGcmHkdfStreamingKeyManager::
AesGcmHkdfStreamingKeyManagerFactory>()) {}
// Returns the version of this key manager.
uint32_t get_version() const override { return 0; }
google::crypto::tink::KeyData::KeyMaterialType key_material_type()
const override {
return google::crypto::tink::KeyData::SYMMETRIC;
}
const std::string& get_key_type() const override { return key_type_; }
crypto::tink::util::Status ValidateKey(
const google::crypto::tink::AesGcmHkdfStreamingKey& key) const override;
crypto::tink::util::Status ValidateKeyFormat(
const google::crypto::tink::AesGcmHkdfStreamingKeyFormat& key_format)
const override;
crypto::tink::util::StatusOr<google::crypto::tink::AesGcmHkdfStreamingKey>
CreateKey(const google::crypto::tink::AesGcmHkdfStreamingKeyFormat&
key_format) const override;
crypto::tink::util::StatusOr<google::crypto::tink::AesGcmHkdfStreamingKey>
DeriveKey(
const google::crypto::tink::AesGcmHkdfStreamingKeyFormat& key_format,
InputStream* input_stream) const override;
~AesGcmHkdfStreamingKeyManager() override = default;
private:
const std::string key_type_ = absl::StrCat(
kTypeGoogleapisCom,
google::crypto::tink::AesGcmHkdfStreamingKey().GetTypeName());
static crypto::tink::util::Status Validate(
const google::crypto::tink::AesGcmHkdfStreamingKeyFormat& key_format);
};
} // namespace tink
} // namespace crypto
#endif // TINK_STREAMINGAEAD_AES_GCM_HKDF_STREAMING_KEY_MANAGER_H_
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