146 lines
4.0 KiB
C++
146 lines
4.0 KiB
C++
/*
|
|
|
|
Copyright (c) 2011-2018, 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/config.hpp"
|
|
#include "libtorrent/random.hpp"
|
|
#include "libtorrent/error_code.hpp"
|
|
#include "libtorrent/aux_/openssl.hpp"
|
|
#include "libtorrent/aux_/throw.hpp"
|
|
|
|
#if defined BOOST_NO_CXX11_THREAD_LOCAL
|
|
#include <mutex>
|
|
#endif
|
|
|
|
#if TORRENT_BROKEN_RANDOM_DEVICE
|
|
#include "libtorrent/time.hpp"
|
|
#include <atomic>
|
|
#endif
|
|
|
|
#if TORRENT_USE_CRYPTOAPI
|
|
#include "libtorrent/aux_/win_crypto_provider.hpp"
|
|
|
|
#elif defined TORRENT_USE_LIBCRYPTO
|
|
|
|
#include "libtorrent/aux_/disable_warnings_push.hpp"
|
|
extern "C" {
|
|
#include <openssl/rand.h>
|
|
#include <openssl/err.h>
|
|
}
|
|
#include "libtorrent/aux_/disable_warnings_pop.hpp"
|
|
|
|
#endif
|
|
|
|
#if TORRENT_USE_DEV_RANDOM
|
|
#include "libtorrent/aux_/dev_random.hpp"
|
|
#endif
|
|
|
|
#ifdef BOOST_NO_CXX11_THREAD_LOCAL
|
|
namespace {
|
|
// if the random number generator can't be thread local, just protect it with
|
|
// a mutex. Not ideal, but hopefully not too many people are affected by old
|
|
// systems
|
|
std::mutex rng_mutex;
|
|
}
|
|
#endif
|
|
|
|
namespace libtorrent {
|
|
namespace aux {
|
|
|
|
std::mt19937& random_engine()
|
|
{
|
|
#ifdef TORRENT_BUILD_SIMULATOR
|
|
// make sure random numbers are deterministic. Seed with a fixed number
|
|
static std::mt19937 rng(0x82daf973);
|
|
#else
|
|
|
|
#if TORRENT_BROKEN_RANDOM_DEVICE
|
|
struct {
|
|
std::uint32_t operator()() const
|
|
{
|
|
static std::atomic<std::uint32_t> seed{static_cast<std::uint32_t>(duration_cast<microseconds>(
|
|
std::chrono::high_resolution_clock::now().time_since_epoch()).count())};
|
|
return seed++;
|
|
}
|
|
} dev;
|
|
#else
|
|
static std::random_device dev;
|
|
#endif
|
|
#ifdef BOOST_NO_CXX11_THREAD_LOCAL
|
|
static std::mt19937 rng(dev());
|
|
#else
|
|
thread_local static std::mt19937 rng(dev());
|
|
#endif
|
|
#endif
|
|
return rng;
|
|
}
|
|
|
|
void random_bytes(span<char> buffer)
|
|
{
|
|
#ifdef TORRENT_BUILD_SIMULATOR
|
|
// simulator
|
|
|
|
for (auto& b : buffer) b = char(random(0xff));
|
|
|
|
#elif TORRENT_USE_CRYPTOAPI
|
|
// windows
|
|
|
|
aux::crypt_gen_random(buffer);
|
|
|
|
#elif TORRENT_USE_DEV_RANDOM
|
|
// /dev/random
|
|
|
|
static dev_random dev;
|
|
dev.read(buffer);
|
|
|
|
#elif defined TORRENT_USE_LIBCRYPTO
|
|
// openssl
|
|
|
|
int r = RAND_bytes(reinterpret_cast<unsigned char*>(buffer.data())
|
|
, int(buffer.size()));
|
|
if (r != 1) aux::throw_ex<system_error>(errors::no_entropy);
|
|
#else
|
|
// fallback
|
|
|
|
std::generate(buffer.begin(), buffer.end(), [] { return char(random(0xff)); });
|
|
#endif
|
|
}
|
|
}
|
|
|
|
std::uint32_t random(std::uint32_t const max)
|
|
{
|
|
#ifdef BOOST_NO_CXX11_THREAD_LOCAL
|
|
std::lock_guard<std::mutex> l(rng_mutex);
|
|
#endif
|
|
return std::uniform_int_distribution<std::uint32_t>(0, max)(aux::random_engine());
|
|
}
|
|
}
|