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// Copyright 2020 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_SUBTLE_AEAD_OR_DAEAD_H_
#define TINK_DAEAD_SUBTLE_AEAD_OR_DAEAD_H_
#include <memory>
#include "absl/types/variant.h"
#include "tink/aead.h"
#include "tink/deterministic_aead.h"
namespace crypto {
namespace tink {
namespace subtle {
// This wrapper class abstracts away the differences between Deterministic Aead
// and non-determinstic Aead primitives. This can be useful for building
// higher-level functionality in which either of these primitives can be used.
class AeadOrDaead {
public:
explicit AeadOrDaead(std::unique_ptr<Aead> aead_primitive)
: primitive_variant_(std::move(aead_primitive)) {}
explicit AeadOrDaead(
std::unique_ptr<DeterministicAead> deterministic_aead_primitive)
: primitive_variant_(std::move(deterministic_aead_primitive)) {}
// Encrypts 'plaintext' using the underlying aead or determnistic aead
// primitive, and returns the resulting ciphertext.
crypto::tink::util::StatusOr<std::string> Encrypt(
absl::string_view plaintext, absl::string_view associated_data) const;
// Decrypts 'ciphertext' using the underlying aead or determnistic aead
// primitive, and returns the resulting plaintext.
crypto::tink::util::StatusOr<std::string> Decrypt(
absl::string_view ciphertext, absl::string_view associated_data) const;
private:
absl::variant<std::unique_ptr<const Aead>,
std::unique_ptr<const DeterministicAead>>
primitive_variant_;
};
} // namespace subtle
} // namespace tink
} // namespace crypto
#endif // TINK_DAEAD_SUBTLE_AEAD_OR_DAEAD_H_