1 // Copyright 2017 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 17 #ifndef TINK_AEAD_H_ 18 #define TINK_AEAD_H_ 19 20 #include <string> 21 22 #include "absl/strings/string_view.h" 23 #include "tink/util/statusor.h" 24 25 namespace crypto { 26 namespace tink { 27 28 /////////////////////////////////////////////////////////////////////////////// 29 // The interface for authenticated encryption with associated data. 30 // Implementations of this interface are secure against adaptive 31 // chosen ciphertext attacks. Encryption with associated data ensures 32 // authenticity and integrity of that data, but not its secrecy. 33 // (see RFC 5116, https://tools.ietf.org/html/rfc5116) 34 // 35 // Implementations are expected to be thread safe. 36 class Aead { 37 public: 38 // Encrypts 'plaintext' with 'associated_data' as associated data, 39 // and returns the resulting ciphertext. 40 // The ciphertext allows for checking authenticity and integrity 41 // of the associated data, but does not guarantee its secrecy. 42 virtual crypto::tink::util::StatusOr<std::string> Encrypt( 43 absl::string_view plaintext, absl::string_view associated_data) const = 0; 44 45 // Decrypts 'ciphertext' with 'associated_data' as associated data, 46 // and returns the resulting plaintext. 47 // The decryption verifies the authenticity and integrity 48 // of the associated data, but there are no guarantees wrt. secrecy 49 // of that data. 50 virtual crypto::tink::util::StatusOr<std::string> Decrypt( 51 absl::string_view ciphertext, 52 absl::string_view associated_data) const = 0; 53 54 virtual ~Aead() = default; 55 }; 56 57 } // namespace tink 58 } // namespace crypto 59 60 #endif // TINK_AEAD_H_ 61