premiere-libtorrent/src/hasher.cpp

247 lines
6.4 KiB
C++

/*
Copyright (c) 2003-2016, Arvid Norberg
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_/openssl.hpp"
#if TORRENT_USE_CRYPTOAPI
namespace
{
HCRYPTPROV make_crypt_provider()
{
using namespace libtorrent;
HCRYPTPROV ret;
if (CryptAcquireContext(&ret, nullptr, nullptr, PROV_RSA_FULL
, CRYPT_VERIFYCONTEXT) == false)
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
return ret;
}
HCRYPTPROV get_crypt_provider()
{
static HCRYPTPROV prov = make_crypt_provider();
return prov;
}
}
#endif
namespace libtorrent
{
#ifdef TORRENT_MACOS_DEPRECATED_LIBCRYPTO
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#endif
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_CRYPTOAPI
if (CryptCreateHash(get_crypt_provider(), CALG_SHA1, 0, 0, &m_context) == false)
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
#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, size_t(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;
gcry_md_close(m_context);
gcry_md_copy(&m_context, h.m_context);
return *this;
}
#elif TORRENT_USE_CRYPTOAPI
hasher::hasher(hasher const& h)
{
if (CryptDuplicateHash(h.m_context, 0, 0, &m_context) == false)
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
}
hasher& hasher::operator=(hasher const& h)
{
if (this == &h) return *this;
CryptDestroyHash(m_context);
if (CryptDuplicateHash(h.m_context, 0, 0, &m_context) == false)
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
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, size_t(len)});
}
hasher& hasher::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_SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data()), data.size());
#elif TORRENT_USE_CRYPTOAPI
if (CryptHashData(m_context, reinterpret_cast<BYTE const*>(data.data()), int(data.size()), 0) == false)
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
#elif defined TORRENT_USE_LIBCRYPTO
SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data()), data.size());
#else
SHA1_update(&m_context, reinterpret_cast<unsigned char const*>(data.data()), data.size());
#endif
return *this;
}
sha1_hash hasher::final()
{
sha1_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_SHA1_Final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);
#elif TORRENT_USE_CRYPTOAPI
DWORD size = DWORD(digest.size());
if (CryptGetHashParam(m_context, HP_HASHVAL
, reinterpret_cast<BYTE*>(digest.data()), &size, 0) == false)
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
TORRENT_ASSERT(size == 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_CRYPTOAPI
CryptDestroyHash(m_context);
if (CryptCreateHash(get_crypt_provider(), CALG_SHA1, 0, 0, &m_context) == false)
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
#elif defined TORRENT_USE_LIBCRYPTO
SHA1_Init(&m_context);
#else
SHA1_init(&m_context);
#endif
}
hasher::~hasher()
{
#if TORRENT_USE_CRYPTOAPI
CryptDestroyHash(m_context);
#elif defined TORRENT_USE_LIBGCRYPT
gcry_md_close(m_context);
#endif
}
#ifdef TORRENT_MACOS_DEPRECATED_LIBCRYPTO
#pragma clang diagnostic pop
#endif
}