| // Copyright 2020 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_PRF_HMAC_PRF_KEY_MANAGER_H_ |
| #define TINK_PRF_HMAC_PRF_KEY_MANAGER_H_ |
| |
| #include <algorithm> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "absl/memory/memory.h" |
| #include "absl/strings/string_view.h" |
| #include "tink/core/key_type_manager.h" |
| #include "tink/internal/fips_utils.h" |
| #include "tink/key_manager.h" |
| #include "tink/subtle/common_enums.h" |
| #include "tink/subtle/prf/prf_set_util.h" |
| #include "tink/subtle/random.h" |
| #include "tink/subtle/stateful_hmac_boringssl.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 "tink/util/validation.h" |
| #include "proto/hmac_prf.pb.h" |
| #include "proto/tink.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| class HmacPrfKeyManager |
| : public KeyTypeManager<google::crypto::tink::HmacPrfKey, |
| google::crypto::tink::HmacPrfKeyFormat, List<Prf>> { |
| public: |
| class PrfFactory : public PrimitiveFactory<Prf> { |
| crypto::tink::util::StatusOr<std::unique_ptr<Prf>> Create( |
| const google::crypto::tink::HmacPrfKey& key) const override { |
| return subtle::CreatePrfFromStatefulMacFactory( |
| absl::make_unique<subtle::StatefulHmacBoringSslFactory>( |
| util::Enums::ProtoToSubtle(key.params().hash()), |
| MaxOutputLength(util::Enums::ProtoToSubtle(key.params().hash())), |
| util::SecretDataFromStringView(key.key_value()))); |
| } |
| }; |
| |
| HmacPrfKeyManager() |
| : KeyTypeManager(absl::make_unique<HmacPrfKeyManager::PrfFactory>()) {} |
| |
| uint32_t get_version() const override { return 0; } |
| |
| google::crypto::tink::KeyData::KeyMaterialType key_material_type() |
| const override { |
| return google::crypto::tink::KeyData::SYMMETRIC; |
| } |
| |
| static uint64_t MaxOutputLength(subtle::HashType hash_type) { |
| static std::map<subtle::HashType, uint64_t>* max_output_length = |
| new std::map<subtle::HashType, uint64_t>( |
| {{subtle::HashType::SHA1, 20}, |
| {subtle::HashType::SHA256, 32}, |
| {subtle::HashType::SHA512, 64}}); |
| auto length_it = max_output_length->find(hash_type); |
| if (length_it == max_output_length->end()) { |
| return 0; |
| } |
| return length_it->second; |
| } |
| |
| const std::string& get_key_type() const override { return key_type_; } |
| |
| crypto::tink::util::Status ValidateKey( |
| const google::crypto::tink::HmacPrfKey& key) const override; |
| |
| crypto::tink::util::Status ValidateKeyFormat( |
| const google::crypto::tink::HmacPrfKeyFormat& key_format) const override; |
| |
| crypto::tink::util::StatusOr<google::crypto::tink::HmacPrfKey> CreateKey( |
| const google::crypto::tink::HmacPrfKeyFormat& key_format) const override; |
| |
| util::StatusOr<google::crypto::tink::HmacPrfKey> DeriveKey( |
| const google::crypto::tink::HmacPrfKeyFormat& hmac_prf_key_format, |
| InputStream* input_stream) const override; |
| |
| internal::FipsCompatibility FipsStatus() const override { |
| return internal::FipsCompatibility::kRequiresBoringCrypto; |
| } |
| |
| private: |
| util::Status ValidateParams( |
| const google::crypto::tink::HmacPrfParams& params) const; |
| |
| const std::string key_type_ = absl::StrCat( |
| kTypeGoogleapisCom, google::crypto::tink::HmacPrfKey().GetTypeName()); |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_PRF_HMAC_PRF_KEY_MANAGER_H_ |