| // Copyright 2023 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_DAEAD_DETERMINISTIC_AEAD_KEY_H_ |
| #define TINK_DAEAD_DETERMINISTIC_AEAD_KEY_H_ |
| |
| #include "absl/strings/string_view.h" |
| #include "tink/daead/deterministic_aead_parameters.h" |
| #include "tink/key.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| // Represents a function to encrypt and decrypt data using deterministic |
| // authenticated encryption with associated data (Deterministic AEAD). |
| class DeterministicAeadKey : public Key { |
| public: |
| // Returns the bytes prefixed to every ciphertext generated by this key. |
| // |
| // In order to make key rotation more efficient, Tink allows every |
| // Deterministic AEAD key to have an associated ciphertext output prefix. When |
| // decrypting a ciphertext, only keys with a matching prefix have to be tried. |
| // |
| // See https://developers.google.com/tink/wire-format#tink_output_prefix for |
| // more background information on Tink output prefixes. |
| virtual absl::string_view GetOutputPrefix() const = 0; |
| |
| const DeterministicAeadParameters& GetParameters() const override = 0; |
| |
| bool operator==(const Key& other) const override = 0; |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_DAEAD_DETERMINISTIC_AEAD_KEY_H_ |