1 // Copyright 2019 Google LLC 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 17 // The interface for stateful message authentication codes. 18 // 19 // WARNING: implementations of this interface are thread-compatible, 20 // but not thread-safe. Therefore, a streaming mac implemented with this 21 // interface is required to additionally enforce thread safety. 22 // 23 // This interface supports the implementation of both streaming 24 // and non-streaming MACs. It does not enforce thread-safety in order to avoid 25 // an unnecessary performance overhead for non-streaming MAC implementations. 26 27 #ifndef TINK_SUBTLE_MAC_STATEFUL_MAC_H_ 28 #define TINK_SUBTLE_MAC_STATEFUL_MAC_H_ 29 30 #include <memory> 31 #include <string> 32 33 #include "absl/strings/string_view.h" 34 #include "tink/util/status.h" 35 #include "tink/util/statusor.h" 36 37 namespace crypto { 38 namespace tink { 39 namespace subtle { 40 41 class StatefulMac { 42 public: 43 StatefulMac() = default; 44 virtual ~StatefulMac() = default; 45 46 virtual util::Status Update(absl::string_view data) = 0; 47 virtual util::StatusOr<std::string> Finalize() = 0; 48 }; 49 50 class StatefulMacFactory { 51 public: 52 virtual ~StatefulMacFactory() = default; 53 54 virtual util::StatusOr<std::unique_ptr<StatefulMac>> Create() const = 0; 55 }; 56 57 } // namespace subtle 58 } // namespace tink 59 } // namespace crypto 60 61 #endif // TINK_SUBTLE_MAC_STATEFUL_MAC_H_ 62