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// 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_