/* -*- 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_CXX_SECURITY_DETAIL_OPENSSL_HELPER_HPP
#define NDN_CXX_SECURITY_DETAIL_OPENSSL_HELPER_HPP

#include "openssl.hpp"
#include "../security-common.hpp"

namespace ndn {
namespace security {
namespace detail {

const EVP_MD*
digestAlgorithmToEvpMd(DigestAlgorithm algo);

int
getEvpPkeyType(EVP_PKEY* key);

class EvpMdCtx : noncopyable
{
public:
  EvpMdCtx();

  ~EvpMdCtx();

  operator EVP_MD_CTX*() const
  {
    return m_ctx;
  }

private:
  EVP_MD_CTX* m_ctx;
};

class EvpPkeyCtx : noncopyable
{
public:
  explicit
  EvpPkeyCtx(EVP_PKEY* key);

  explicit
  EvpPkeyCtx(int id);

  ~EvpPkeyCtx();

  operator EVP_PKEY_CTX*() const
  {
    return m_ctx;
  }

private:
  EVP_PKEY_CTX* m_ctx;
};

class Bio : noncopyable
{
public:
#if OPENSSL_VERSION_NUMBER < 0x1010000fL
  using MethodPtr = BIO_METHOD*;
#else
  using MethodPtr = const BIO_METHOD*;
#endif // OPENSSL_VERSION_NUMBER < 0x1010000fL

  explicit
  Bio(MethodPtr method);

  ~Bio();

  operator BIO*() const
  {
    return m_bio;
  }

  bool
  read(uint8_t* buf, size_t buflen) const noexcept;

  bool
  write(const uint8_t* buf, size_t buflen) noexcept;

private:
  BIO* m_bio;
};

} // namespace detail
} // namespace security
} // namespace ndn

#endif // NDN_CXX_SECURITY_DETAIL_OPENSSL_HELPER_HPP