text: /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
  /*
   * Copyright (c) 2013-2018 Regents of the University of California.
   *
   * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
   *
   * ndn-cxx 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.
   *
   * ndn-cxx 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 ndn-cxx authors and contributors.
   */
  
  #include "command-interest-signer.hpp"
  #include "../util/random.hpp"
  
  namespace ndn {
  namespace security {
  
  CommandInterestPreparer::CommandInterestPreparer()
    : m_lastUsedTimestamp(0)
  {
  }
  
  Name
  CommandInterestPreparer::prepareCommandInterestName(Name name)
  {
    time::milliseconds timestamp = time::toUnixTimestamp(time::system_clock::now());
    if (timestamp <= m_lastUsedTimestamp) {
      timestamp = m_lastUsedTimestamp + 1_ms;
    }
    m_lastUsedTimestamp = timestamp;
  
    name
      .append(name::Component::fromNumber(timestamp.count()))
      .append(name::Component::fromNumber(random::generateWord64())) // nonce
      ;
  
    return name;
  }
  
  CommandInterestSigner::CommandInterestSigner(KeyChain& keyChain)
    : m_keyChain(keyChain)
  {
  }
  
  Interest
  CommandInterestSigner::makeCommandInterest(const Name& name, const SigningInfo& params)
  {
    Interest commandInterest(prepareCommandInterestName(name));
    commandInterest.setCanBePrefix(false);
    m_keyChain.sign(commandInterest, params);
    return commandInterest;
  }
  
  } // namespace security
  } // namespace ndn
  