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decrease cryptoapi aux::random_bytes() cpu usage

This commit is contained in:
Andrei Kurushin 2016-12-30 00:52:34 +03:00 committed by Arvid Norberg
parent ea6e29d23f
commit 4d92e22cd8
1 changed files with 29 additions and 15 deletions
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44
src/random.cpp
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@ -51,6 +51,34 @@ extern "C" {
#include "libtorrent/aux_/disable_warnings_pop.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
{
namespace aux
@ -70,22 +98,9 @@ namespace libtorrent
void random_bytes(span<char> buffer)
{
#if TORRENT_USE_CRYPTOAPI
HCRYPTPROV prov;
if (!CryptAcquireContext(&prov, NULL, NULL
, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
{
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
std::terminate();
#endif
}
if (!CryptGenRandom(prov, int(buffer.size())
if (!CryptGenRandom(get_crypt_provider(), int(buffer.size())
, reinterpret_cast<BYTE*>(buffer.data())))
{
CryptReleaseContext(prov, 0);
#ifndef BOOST_NO_EXCEPTIONS
throw system_error(error_code(GetLastError(), system_category()));
#else
@ -93,7 +108,6 @@ namespace libtorrent
#endif
}
CryptReleaseContext(prov, 0);
#elif defined TORRENT_USE_LIBCRYPTO
#ifdef TORRENT_MACOS_DEPRECATED_LIBCRYPTO
#pragma clang diagnostic push