110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/*
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Copyright (c) 2011-2016, 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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#include "libtorrent/config.hpp"
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#include "libtorrent/random.hpp"
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#include "libtorrent/error_code.hpp"
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#include "libtorrent/aux_/openssl.hpp"
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#include "libtorrent/aux_/throw.hpp"
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#if TORRENT_USE_CRYPTOAPI
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#include "libtorrent/aux_/win_crypto_provider.hpp"
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#elif defined TORRENT_USE_LIBCRYPTO
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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extern "C" {
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#include <openssl/rand.h>
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#include <openssl/err.h>
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}
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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#endif
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#if TORRENT_USE_DEV_RANDOM
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#include "libtorrent/aux_/dev_random.hpp"
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#endif
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namespace libtorrent
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{
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namespace aux
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{
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std::mt19937& random_engine()
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{
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#ifdef TORRENT_BUILD_SIMULATOR
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// make sure random numbers are deterministic. Seed with a fixed number
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static std::mt19937 rng(0x82daf973);
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#else
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static std::random_device dev;
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static std::mt19937 rng(dev());
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#endif
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return rng;
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}
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void random_bytes(span<char> buffer)
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{
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#ifdef TORRENT_BUILD_SIMULATOR
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// simulator
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for (auto& b : buffer) b = char(random(0xff));
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#elif TORRENT_USE_CRYPTOAPI
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// windows
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aux::crypt_gen_random(buffer);
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#elif TORRENT_USE_DEV_RANDOM
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// /dev/random
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static dev_random dev;
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dev.read(buffer);
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#elif defined TORRENT_USE_LIBCRYPTO
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// openssl
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int r = RAND_bytes(reinterpret_cast<unsigned char*>(buffer.data())
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, int(buffer.size()));
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if (r != 1) aux::throw_ex<system_error>(errors::no_entropy);
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#else
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// fallback
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for (auto& b : buffer) b = char(random(0xff));
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#endif
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}
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}
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std::uint32_t random(std::uint32_t max)
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{
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return std::uniform_int_distribution<std::uint32_t>(0, max)(aux::random_engine());
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}
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}
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