143 lines
4.1 KiB
C++
143 lines
4.1 KiB
C++
/*
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Copyright (c) 2016, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_WIN_CRYPTO_PROVIDER_HPP
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#define TORRENT_WIN_CRYPTO_PROVIDER_HPP
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#include "libtorrent/config.hpp"
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#include "libtorrent/error_code.hpp"
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#include "libtorrent/aux_/throw.hpp"
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#include <windows.h>
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#include <wincrypt.h>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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namespace libtorrent { namespace aux {
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inline HCRYPTPROV crypt_acquire_provider(DWORD provider_type)
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{
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HCRYPTPROV ret;
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if (CryptAcquireContext(&ret, nullptr, nullptr, provider_type
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, CRYPT_VERIFYCONTEXT) == false)
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{
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throw_ex<system_error>(error_code(GetLastError(), system_category()));
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}
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return ret;
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}
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inline void crypt_gen_random(span<char> buffer)
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{
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static HCRYPTPROV provider = crypt_acquire_provider(PROV_RSA_FULL);
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if (!CryptGenRandom(provider, int(buffer.size())
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, reinterpret_cast<BYTE*>(buffer.data())))
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{
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throw_ex<system_error>(error_code(GetLastError(), system_category()));
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}
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}
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template <ALG_ID AlgId, DWORD ProviderType>
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struct crypt_hash
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{
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crypt_hash() { m_hash = create(); }
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crypt_hash(crypt_hash const& h) { m_hash = duplicate(h); }
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~crypt_hash() { CryptDestroyHash(m_hash); }
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crypt_hash& crypt_hash::operator=(crypt_hash const& h)
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{
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if (this == &h) return *this;
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HCRYPTHASH temp = duplicate(h);
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CryptDestroyHash(m_hash);
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m_hash = temp;
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return *this;
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}
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void reset()
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{
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HCRYPTHASH temp = create();
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CryptDestroyHash(m_hash);
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m_hash = temp;
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}
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void update(span<char const> data)
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{
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if (CryptHashData(m_hash, reinterpret_cast<BYTE const*>(data.data()), int(data.size()), 0) == false)
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{
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throw_ex<system_error>(error_code(GetLastError(), system_category()));
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}
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}
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void get_hash(char *digest, std::size_t digest_size)
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{
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DWORD size = DWORD(digest_size);
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if (CryptGetHashParam(m_hash, HP_HASHVAL
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, reinterpret_cast<BYTE*>(digest), &size, 0) == false)
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{
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throw_ex<system_error>(error_code(GetLastError(), system_category()));
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}
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TORRENT_ASSERT(size == DWORD(digest_size));
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}
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private:
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HCRYPTHASH create()
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{
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HCRYPTHASH ret;
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if (CryptCreateHash(get_provider(), AlgId, 0, 0, &ret) == false)
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{
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throw_ex<system_error>(error_code(GetLastError(), system_category()));
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}
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return ret;
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}
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HCRYPTHASH duplicate(crypt_hash const& h)
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{
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HCRYPTHASH ret;
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if (CryptDuplicateHash(h.m_hash, 0, 0, &ret) == false)
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{
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throw_ex<system_error>(error_code(GetLastError(), system_category()));
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}
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return ret;
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}
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HCRYPTPROV get_provider()
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{
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static HCRYPTPROV provider = crypt_acquire_provider(ProviderType);
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return provider;
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}
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HCRYPTHASH m_hash;
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};
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} // namespace aux
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} // namespace libtorrent
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#endif
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