/*

Copyright (c) 2003-2016, Arvid Norberg, Alden Torres

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

    * Redistributions of source code must retain the above copyright

      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright

      notice, this list of conditions and the following disclaimer in

      the documentation and/or other materials provided with the distribution.

    * Neither the name of the author nor the names of its

      contributors may be used to endorse or promote products derived

      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

*/

#include "libtorrent/aux_/hasher512.hpp"

#include "libtorrent/error_code.hpp"

#include "libtorrent/assert.hpp"

#include "libtorrent/ssl.hpp"

#include "libtorrent/aux_/disable_deprecation_warnings_push.hpp"

namespace libtorrent {

namespace aux {

  hasher512::hasher512()

  {

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_open(&m_context, GCRY_MD_SHA512, 0);

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA512_Init(&m_context);

#elif TORRENT_USE_CNG

#elif TORRENT_USE_CRYPTOAPI_SHA_512

#elif defined TORRENT_USE_LIBCRYPTO

    SHA512_Init(&m_context);

#else

    SHA512_init(&m_context);

#endif

  }

  hasher512::hasher512(span<char const> data)

    : hasher512()

  {

    update(data);

  }

#ifdef TORRENT_USE_LIBGCRYPT

  hasher512::hasher512(hasher512 const& h)

  {

    gcry_md_copy(&m_context, h.m_context);

  }

  hasher512& hasher512::operator=(hasher512 const& h) &

  {

    if (this == &h) return *this;

    gcry_md_close(m_context);

    gcry_md_copy(&m_context, h.m_context);

    return *this;

  }

#else

  hasher512::hasher512(hasher512 const&) = default;

  hasher512& hasher512::operator=(hasher512 const&) & = default;

#endif

  hasher512& hasher512::update(span<char const> data)

  {

    TORRENT_ASSERT(data.size() > 0);

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_write(m_context, data.data(), static_cast<std::size_t>(data.size()));

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA512_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data()), CC_LONG(data.size()));

#elif TORRENT_USE_CNG

    m_context.update(data);

#elif TORRENT_USE_CRYPTOAPI_SHA_512

    m_context.update(data);

#elif defined TORRENT_USE_LIBCRYPTO

    SHA512_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data())

      , static_cast<std::size_t>(data.size()));

#else

    SHA512_update(&m_context, reinterpret_cast<unsigned char const*>(data.data())

      , static_cast<std::size_t>(data.size()));

#endif

    return *this;

  }

  sha512_hash hasher512::final()

  {

    sha512_hash digest;

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_final(m_context);

    digest.assign(reinterpret_cast<char const*>(gcry_md_read(m_context, 0)));

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA512_Final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);

#elif TORRENT_USE_CNG

    m_context.get_hash(digest.data(), digest.size());

#elif TORRENT_USE_CRYPTOAPI_SHA_512

    m_context.get_hash(digest.data(), digest.size());

#elif defined TORRENT_USE_LIBCRYPTO

    SHA512_Final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);

#else

    SHA512_final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);

#endif

    return digest;

  }

  void hasher512::reset()

  {

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_reset(m_context);

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA512_Init(&m_context);

#elif TORRENT_USE_CNG

    m_context.reset();

#elif TORRENT_USE_CRYPTOAPI_SHA_512

    m_context.reset();

#elif defined TORRENT_USE_LIBCRYPTO

    SHA512_Init(&m_context);

#else

    SHA512_init(&m_context);

#endif

  }

#if defined TORRENT_USE_LIBGCRYPT

  hasher512::~hasher512()

  {

    gcry_md_close(m_context);

  }

#else

  hasher512::~hasher512() = default;

#endif

}

}

#include "libtorrent/aux_/disable_warnings_pop.hpp"