encryptor.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2022, Regents of the University of California
 *
 * NAC library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * NAC library is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of NAC library authors and contributors.
 */
 
#ifndef NDN_NAC_ENCRYPTOR_HPP
#define NDN_NAC_ENCRYPTOR_HPP
 
#include "common.hpp"
#include "encrypted-content.hpp"
 
namespace ndn::nac {
 
class Encryptor
{
public:
  Encryptor(const Name& accessPrefix,
            const Name& ckPrefix, SigningInfo ckDataSigningInfo,
            const ErrorCallback& onFailure,
            Validator& validator, KeyChain& keyChain, Face& face);
 
  ~Encryptor();
 
  EncryptedContent
  encrypt(span<const uint8_t> data);
 
  void
  regenerateCk();
 
public: // accessor interface for published data packets
  size_t
  size() const
  {
    return m_ims.size();
  }
 
  InMemoryStorage::const_iterator
  begin() const
  {
    return m_ims.begin();
  }
 
  InMemoryStorage::const_iterator
  end() const
  {
    return m_ims.end();
  }
 
private:
  void
  retryFetchingKek();
 
  void
  fetchKekAndPublishCkData(const std::function<void()>& onReady,
                           const ErrorCallback& onFailure,
                           size_t nTriesLeft);
 
  bool
  makeAndPublishCkData(const ErrorCallback& onFailure);
 
NAC_PUBLIC_WITH_TESTS_ELSE_PRIVATE:
  Name m_accessPrefix;
  Name m_ckPrefix;
  Name m_ckName;
  Buffer m_ckBits;
  SigningInfo m_ckDataSigningInfo;
 
  bool m_isKekRetrievalInProgress;
  std::optional<Data> m_kek;
  ErrorCallback m_onFailure;
 
  InMemoryStoragePersistent m_ims; // for encrypted CKs
  ScopedRegisteredPrefixHandle m_ckReg;
  PendingInterestHandle m_kekPendingInterest;
 
  KeyChain& m_keyChain;
  Face& m_face;
  Scheduler m_scheduler;
};
 
} // namespace ndn::nac
 
#endif // NDN_NAC_ENCRYPTOR_HPP