| // 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_DETERMINISTIC_AEAD_H_ |
| #define TINK_DETERMINISTIC_AEAD_H_ |
| |
| #include <string> |
| |
| #include "absl/strings/string_view.h" |
| #include "tink/util/statusor.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // The interface for deterministic authenticated encryption with associated |
| // data. |
| // TODO(bleichen): Copy the interface from Java. |
| // Check the properties: |
| // - authenticated |
| // - secure in multi-user setting |
| // - thread safe/copy safe |
| // References: |
| // https://eprint.iacr.org/2016/1124.pdf |
| class DeterministicAead { |
| public: |
| // Encrypts 'plaintext' with 'associated_data' as associated data |
| // deterministically, and returns the resulting ciphertext. |
| // The ciphertext allows for checking authenticity and integrity |
| // of the associated data, but does not guarantee its secrecy. |
| virtual crypto::tink::util::StatusOr<std::string> EncryptDeterministically( |
| absl::string_view plaintext, absl::string_view associated_data) const = 0; |
| |
| // Decrypts 'ciphertext' with 'associated_data' as associated data, |
| // and returns the resulting plaintext. |
| // The decryption verifies the authenticity and integrity |
| // of the associated data, but there are no guarantees wrt. secrecy |
| // of that data. |
| virtual crypto::tink::util::StatusOr<std::string> DecryptDeterministically( |
| absl::string_view ciphertext, |
| absl::string_view associated_data) const = 0; |
| |
| virtual ~DeterministicAead() {} |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_DETERMINISTIC_AEAD_H_ |