tpm.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2017 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.
 */

#ifndef NDN_SECURITY_TPM_TPM_HPP
#define NDN_SECURITY_TPM_TPM_HPP

#include "key-handle.hpp"
#include "../key-params.hpp"
#include "../../name.hpp"

#include <unordered_map>

namespace ndn {
namespace security {

namespace v2 {
class KeyChain;
} // namespace v2

namespace tpm {

class BackEnd;

class Tpm : noncopyable
{
public:
  class Error : public std::runtime_error
  {
  public:
    explicit
    Error(const std::string& what)
      : std::runtime_error(what)
    {
    }
  };

public:
  ~Tpm();

  std::string
  getTpmLocator() const;

  bool
  hasKey(const Name& keyName) const;

  ConstBufferPtr
  getPublicKey(const Name& keyName) const;

  ConstBufferPtr
  sign(const uint8_t* buf, size_t size, const Name& keyName, DigestAlgorithm digestAlgorithm) const;

  ConstBufferPtr
  decrypt(const uint8_t* buf, size_t size, const Name& keyName) const;

public: // Management
  bool
  isTerminalMode() const;

  void
  setTerminalMode(bool isTerminal) const;

  bool
  isTpmLocked() const;

  bool
  unlockTpm(const char* password, size_t passwordLength) const;

NDN_CXX_PUBLIC_WITH_TESTS_ELSE_PRIVATE:
  /*
   * @brief Create a new TPM instance with the specified @p location.
   *
   * @param scheme The scheme for the TPM
   * @param location The location for the TPM
   * @param impl The back-end implementation
   */
  Tpm(const std::string& scheme, const std::string& location, unique_ptr<BackEnd> impl);

  Name
  createKey(const Name& identityName, const KeyParams& params);

  void
  deleteKey(const Name& keyName);

  ConstBufferPtr
  exportPrivateKey(const Name& keyName, const char* pw, size_t pwLen) const;

  void
  importPrivateKey(const Name& keyName, const uint8_t* pkcs8, size_t pkcs8Len,
                   const char* pw, size_t pwLen);

  void
  clearKeyCache()
  {
    m_keys.clear();
  }

private:
  const KeyHandle*
  findKey(const Name& keyName) const;

private:
  std::string m_scheme;
  std::string m_location;

  mutable std::unordered_map<Name, unique_ptr<KeyHandle>> m_keys;

  const unique_ptr<BackEnd> m_backEnd;

  friend class v2::KeyChain;
};

} // namespace tpm

using tpm::Tpm;

} // namespace security
} // namespace ndn

#endif // NDN_SECURITY_TPM_TPM_HPP