// Copyright 2015 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef WEBSERVER_WEBSERVD_ENCRYPTOR_H_
#define WEBSERVER_WEBSERVD_ENCRYPTOR_H_

#include <memory>
#include <string>

namespace webservd {

// An abstract class to perform authenticated encryption.
class Encryptor {
 public:
  virtual ~Encryptor() = default;

  // Encrypts and authenticates the given |plaintext| and emits the
  // |ciphertext|. Returns true on success.
  virtual bool EncryptWithAuthentication(const std::string& plaintext,
                                         std::string* ciphertext) = 0;

  // Decrypts and authenticates the given |ciphertext| and emits the
  // |plaintext|. Returns true on success.
  virtual bool DecryptWithAuthentication(const std::string& ciphertext,
                                         std::string* plaintext) = 0;

  // A factory method to be exported by the default Encryptor implementation
  // for a given platform. Like a constructor, this method should not perform
  // any significant initialization work. The caller assumes ownership of the
  // pointer.
  static std::unique_ptr<Encryptor> CreateDefaultEncryptor();
};

}  // namespace webservd

#endif  // WEBSERVER_WEBSERVD_ENCRYPTOR_H_