folly/folly/Random.cpp

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <folly/Random.h>

#include <array>
#include <mutex>
#include <random>

#include <folly/CppAttributes.h>
#include <folly/SingletonThreadLocal.h>
#include <folly/ThreadLocal.h>
#include <folly/detail/FileUtilDetail.h>
#include <folly/portability/Config.h>
#include <folly/portability/SysTime.h>
#include <folly/portability/Unistd.h>
#include <folly/synchronization/RelaxedAtomic.h>

#include <glog/logging.h>

#ifdef _MSC_VER
#include <wincrypt.h> // @manual
#else
#include <fcntl.h>
#endif

#if FOLLY_HAVE_GETRANDOM
#include <sys/random.h>
#endif

namespace folly {

namespace {

void readRandomDevice(void* data, size_t size) { … }

class BufferedRandomDevice { … };

relaxed_atomic<size_t> BufferedRandomDevice::globalEpoch_{ … };
struct RandomTag { … };

BufferedRandomDevice::BufferedRandomDevice(size_t bufferSize)
    : … { … }

void BufferedRandomDevice::getSlow(unsigned char* data, size_t size) { … }

} // namespace

void Random::secureRandom(void* data, size_t size) { … }

ThreadLocalPRNG::result_type ThreadLocalPRNG::operator()() { … }
} // namespace folly