| // Copyright 2017 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. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| #ifndef TINK_AEAD_AES_GCM_KEY_MANAGER_H_ |
| #define TINK_AEAD_AES_GCM_KEY_MANAGER_H_ |
| |
| #include <algorithm> |
| #include <vector> |
| |
| #include "absl/strings/string_view.h" |
| #include "tink/aead.h" |
| #include "tink/core/key_type_manager.h" |
| #include "tink/key_manager.h" |
| #include "tink/subtle/aes_gcm_boringssl.h" |
| #include "tink/subtle/random.h" |
| #include "tink/util/constants.h" |
| #include "tink/util/errors.h" |
| #include "tink/util/protobuf_helper.h" |
| #include "tink/util/status.h" |
| #include "tink/util/statusor.h" |
| #include "tink/util/validation.h" |
| #include "proto/aes_gcm.pb.h" |
| #include "proto/tink.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| class AesGcmKeyManager |
| : public KeyTypeManager<google::crypto::tink::AesGcmKey, |
| google::crypto::tink::AesGcmKeyFormat, List<Aead>> { |
| public: |
| class AeadFactory : public PrimitiveFactory<Aead> { |
| crypto::tink::util::StatusOr<std::unique_ptr<Aead>> Create( |
| const google::crypto::tink::AesGcmKey& key) const override { |
| auto aes_gcm_result = subtle::AesGcmBoringSsl::New(key.key_value()); |
| if (!aes_gcm_result.ok()) return aes_gcm_result.status(); |
| return {std::move(aes_gcm_result.ValueOrDie())}; |
| } |
| }; |
| |
| AesGcmKeyManager() |
| : KeyTypeManager(absl::make_unique<AesGcmKeyManager::AeadFactory>()) {} |
| |
| // 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::AesGcmKey& key) const override { |
| crypto::tink::util::Status status = |
| ValidateVersion(key.version(), get_version()); |
| if (!status.ok()) return status; |
| return ValidateAesKeySize(key.key_value().size()); |
| } |
| |
| crypto::tink::util::Status ValidateKeyFormat( |
| const google::crypto::tink::AesGcmKeyFormat& key_format) const override { |
| return ValidateAesKeySize(key_format.key_size()); |
| } |
| |
| crypto::tink::util::StatusOr<google::crypto::tink::AesGcmKey> CreateKey( |
| const google::crypto::tink::AesGcmKeyFormat& key_format) const override { |
| google::crypto::tink::AesGcmKey key; |
| key.set_version(get_version()); |
| key.set_key_value( |
| crypto::tink::subtle::Random::GetRandomBytes(key_format.key_size())); |
| return key; |
| } |
| |
| private: |
| const std::string key_type_ = absl::StrCat( |
| kTypeGoogleapisCom, google::crypto::tink::AesGcmKey().GetTypeName()); |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_AEAD_AES_GCM_KEY_MANAGER_H_ |