/*

Copyright (c) 2013-2014, 2016-2021, Arvid Norberg

Copyright (c) 2016, 2018, Alden Torres

Copyright (c) 2017, 2019, Andrei Kurushin

Copyright (c) 2017, Steven Siloti

Copyright (c) 2020, Paul-Louis Ageneau

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/hasher.hpp"

#include "libtorrent/error_code.hpp"

#include "libtorrent/assert.hpp"

#include "libtorrent/aux_/disable_deprecation_warnings_push.hpp"

namespace libtorrent {

TORRENT_CRYPTO_NAMESPACE

  hasher::hasher()

  {

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_open(&m_context, GCRY_MD_SHA1, 0);

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA1_Init(&m_context);

#elif TORRENT_USE_CNG

#elif TORRENT_USE_CRYPTOAPI

#elif defined TORRENT_USE_LIBCRYPTO

    SHA1_Init(&m_context);

#else

    SHA1_init(&m_context);

#endif

  }

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

    : hasher()

  {

    update(data);

  }

  hasher::hasher(char const* data, int len)

    : hasher()

  {

    TORRENT_ASSERT(len > 0);

    update({data, len});

  }

#ifdef TORRENT_USE_LIBGCRYPT

  hasher::hasher(hasher const& h)

  {

    gcry_md_copy(&m_context, h.m_context);

  }

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

  {

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

    gcry_md_close(m_context);

    gcry_md_copy(&m_context, h.m_context);

    return *this;

  }

#else

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

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

#endif

  hasher& hasher::update(char const* data, int len)

  {

    return update({data, len});

  }

  hasher& hasher::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_SHA1_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

    m_context.update(data);

#elif defined TORRENT_USE_LIBCRYPTO

    SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data())

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

#else

    SHA1_update(&m_context, reinterpret_cast<unsigned char const*>(data.data())

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

#endif

    return *this;

  }

  sha1_hash hasher::final()

  {

    sha1_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_SHA1_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

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

#elif defined TORRENT_USE_LIBCRYPTO

    SHA1_Final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);

#else

    SHA1_final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);

#endif

    return digest;

  }

  void hasher::reset()

  {

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_reset(m_context);

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA1_Init(&m_context);

#elif TORRENT_USE_CNG

    m_context.reset();

#elif TORRENT_USE_CRYPTOAPI

    m_context.reset();

#elif defined TORRENT_USE_LIBCRYPTO

    SHA1_Init(&m_context);

#else

    SHA1_init(&m_context);

#endif

  }

  hasher::~hasher()

  {

#if defined TORRENT_USE_LIBGCRYPT

    gcry_md_close(m_context);

#endif

  }

  hasher256::hasher256()

  {

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_open(&m_context, GCRY_MD_SHA256, 0);

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA256_Init(&m_context);

#elif TORRENT_USE_CNG

#elif TORRENT_USE_CRYPTOAPI_SHA_512

#elif defined TORRENT_USE_LIBCRYPTO

    SHA256_Init(&m_context);

#else

    SHA256_init(m_context);

#endif

  }

  hasher256::hasher256(span<char const> data)

    : hasher256()

  {

    update(data);

  }

  hasher256::hasher256(char const* data, int len)

    : hasher256()

  {

    TORRENT_ASSERT(len > 0);

    update({ data, len });

  }

#ifdef TORRENT_USE_LIBGCRYPT

  hasher256::hasher256(hasher256 const& h)

  {

    gcry_md_copy(&m_context, h.m_context);

  }

  hasher256& hasher256::operator=(hasher256 const& h) &

  {

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

    gcry_md_close(m_context);

    gcry_md_copy(&m_context, h.m_context);

    return *this;

  }

#else

  hasher256::hasher256(hasher256 const&) = default;

  hasher256& hasher256::operator=(hasher256 const&) & = default;

#endif

  hasher256& hasher256::update(char const* data, int len)

  {

    return update({ data, len });

  }

  hasher256& hasher256::update(span<char const> data)

  {

    TORRENT_ASSERT(!data.empty());

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_write(m_context, data.data(), data.size());

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA256_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

    SHA256_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data())

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

#else

    SHA256_update(m_context, reinterpret_cast<unsigned char const*>(data.data())

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

#endif

    return *this;

  }

  sha256_hash hasher256::final()

  {

    sha256_hash digest;

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_final(m_context);

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

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA256_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

    SHA256_Final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);

#else

    SHA256_final(reinterpret_cast<unsigned char*>(digest.data()), m_context);

#endif

    return digest;

  }

  void hasher256::reset()

  {

#ifdef TORRENT_USE_LIBGCRYPT

    gcry_md_reset(m_context);

#elif TORRENT_USE_COMMONCRYPTO

    CC_SHA256_Init(&m_context);

#elif TORRENT_USE_CNG

    m_context.reset();

#elif TORRENT_USE_CRYPTOAPI_SHA_512

    m_context.reset();

#elif defined TORRENT_USE_LIBCRYPTO

    SHA256_Init(&m_context);

#else

    SHA256_init(m_context);

#endif

  }

  hasher256::~hasher256()

  {

#if defined TORRENT_USE_LIBGCRYPT

    gcry_md_close(m_context);

#endif

  }

TORRENT_CRYPTO_NAMESPACE_END

#include "libtorrent/aux_/disable_warnings_pop.hpp"

}