1 // Copyright 2019 Google Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 /////////////////////////////////////////////////////////////////////////////// 16 #ifndef TINK_AEAD_AES_GCM_SIV_KEY_MANAGER_H_ 17 #define TINK_AEAD_AES_GCM_SIV_KEY_MANAGER_H_ 18 19 #include <stdint.h> 20 21 #include <memory> 22 #include <string> 23 24 #include "absl/memory/memory.h" 25 #include "absl/strings/str_cat.h" 26 #include "tink/aead.h" 27 #include "tink/core/key_type_manager.h" 28 #include "tink/core/template_util.h" 29 #include "tink/subtle/aes_gcm_siv_boringssl.h" 30 #include "tink/subtle/random.h" 31 #include "tink/util/constants.h" 32 #include "tink/util/secret_data.h" 33 #include "tink/util/status.h" 34 #include "tink/util/statusor.h" 35 #include "tink/util/validation.h" 36 #include "proto/aes_gcm_siv.pb.h" 37 #include "proto/tink.pb.h" 38 39 namespace crypto { 40 namespace tink { 41 42 class AesGcmSivKeyManager 43 : public KeyTypeManager<google::crypto::tink::AesGcmSivKey, 44 google::crypto::tink::AesGcmSivKeyFormat, 45 List<Aead>> { 46 public: 47 class AeadFactory : public PrimitiveFactory<Aead> { Create(const google::crypto::tink::AesGcmSivKey & key)48 crypto::tink::util::StatusOr<std::unique_ptr<Aead>> Create( 49 const google::crypto::tink::AesGcmSivKey& key) const override { 50 return subtle::AesGcmSivBoringSsl::New( 51 util::SecretDataFromStringView(key.key_value())); 52 } 53 }; 54 AesGcmSivKeyManager()55 AesGcmSivKeyManager() : KeyTypeManager(absl::make_unique<AeadFactory>()) {} 56 get_version()57 uint32_t get_version() const override { return 0; } 58 key_material_type()59 google::crypto::tink::KeyData::KeyMaterialType key_material_type() 60 const override { 61 return google::crypto::tink::KeyData::SYMMETRIC; 62 } 63 get_key_type()64 const std::string& get_key_type() const override { return key_type_; } 65 ValidateKey(const google::crypto::tink::AesGcmSivKey & key)66 crypto::tink::util::Status ValidateKey( 67 const google::crypto::tink::AesGcmSivKey& key) const override { 68 crypto::tink::util::Status status = 69 ValidateVersion(key.version(), get_version()); 70 if (!status.ok()) return status; 71 return ValidateAesKeySize(key.key_value().size()); 72 } 73 ValidateKeyFormat(const google::crypto::tink::AesGcmSivKeyFormat & format)74 crypto::tink::util::Status ValidateKeyFormat( 75 const google::crypto::tink::AesGcmSivKeyFormat& format) const override { 76 return ValidateAesKeySize(format.key_size()); 77 } 78 CreateKey(const google::crypto::tink::AesGcmSivKeyFormat & format)79 crypto::tink::util::StatusOr<google::crypto::tink::AesGcmSivKey> CreateKey( 80 const google::crypto::tink::AesGcmSivKeyFormat& format) 81 const override { 82 google::crypto::tink::AesGcmSivKey key; 83 key.set_version(get_version()); 84 key.set_key_value(subtle::Random::GetRandomBytes(format.key_size())); 85 return key; 86 } 87 88 private: 89 const std::string key_type_ = absl::StrCat( 90 kTypeGoogleapisCom, google::crypto::tink::AesGcmSivKey().GetTypeName()); 91 }; 92 93 } // namespace tink 94 } // namespace crypto 95 96 #endif // TINK_AEAD_AES_GCM_SIV_KEY_MANAGER_H_ 97