| // Copyright 2017 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_STREAMING_MAC_H_ |
| #define TINK_STREAMING_MAC_H_ |
| |
| #include <memory> |
| #include <string> |
| |
| #include "absl/strings/string_view.h" |
| #include "tink/output_stream_with_result.h" |
| #include "tink/util/status.h" |
| #include "tink/util/statusor.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Interface for Streaming MACs (Message Authentication Codes). |
| // This interface should be used for authentication only, and not for other |
| // purposes (e.g., it should not be used to generate pseudorandom bytes). |
| class StreamingMac { |
| public: |
| // Returns an ComputeMacOutputStream, which when closed will return the |
| // message authentication code (MAC) of the data put into the stream. |
| virtual util::StatusOr<std::unique_ptr<OutputStreamWithResult<std::string>>> |
| NewComputeMacOutputStream() const = 0; |
| |
| // Returns an VerifyMacOutputStream which verifies if 'mac' is a correct |
| // message authentication code (MAC) for the data written to it. |
| virtual util::StatusOr<std::unique_ptr<OutputStreamWithResult<util::Status>>> |
| NewVerifyMacOutputStream(const std::string& mac_value) const = 0; |
| |
| virtual ~StreamingMac() {} |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_STREAMING_MAC_H_ |