/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <atomic>
#include <unistd.h>
#include <sys/time.h>
+#include <mutex>
#include <random>
#include <array>
#include <glog/logging.h>
#include <folly/File.h>
#include <folly/FileUtil.h>
+#include <folly/ThreadLocal.h>
+
+#ifdef _MSC_VER
+# include <wincrypt.h>
+#endif
namespace folly {
namespace {
-// Keep it open for the duration of the program
-File randomDevice("/dev/urandom");
-
void readRandomDevice(void* data, size_t size) {
- PCHECK(readFull(randomDevice.fd(), data, size) == size);
+#ifdef _MSC_VER
+ static std::once_flag flag;
+ static HCRYPTPROV cryptoProv;
+ std::call_once(flag, [&] {
+ PCHECK(CryptAcquireContext(&cryptoProv, nullptr, nullptr,
+ PROV_RSA_FULL, 0));
+ });
+ CHECK(size <= std::numeric_limits<DWORD>::max());
+ PCHECK(CryptGenRandom(cryptoProv, (DWORD)size, (BYTE*)data));
+#else
+ // Keep the random device open for the duration of the program.
+ static int randomFd = ::open("/dev/urandom", O_RDONLY);
+ PCHECK(randomFd >= 0);
+ auto bytesRead = readFull(randomFd, data, size);
+ PCHECK(bytesRead >= 0 && size_t(bytesRead) == size);
+#endif
}
class BufferedRandomDevice {
ptr_ += size;
}
-ThreadLocal<BufferedRandomDevice> bufferedRandomDevice;
} // namespace
void Random::secureRandom(void* data, size_t size) {
+ static ThreadLocal<BufferedRandomDevice> bufferedRandomDevice;
bufferedRandomDevice->get(data, size);
}
-folly::ThreadLocalPtr<ThreadLocalPRNG::LocalInstancePRNG>
-ThreadLocalPRNG::localInstance;
-
class ThreadLocalPRNG::LocalInstancePRNG {
public:
LocalInstancePRNG() : rng(Random::create()) { }
Random::DefaultGenerator rng;
};
-ThreadLocalPRNG::LocalInstancePRNG* ThreadLocalPRNG::initLocal() {
- auto ret = new LocalInstancePRNG;
- localInstance.reset(ret);
- return ret;
+ThreadLocalPRNG::ThreadLocalPRNG() {
+ static folly::ThreadLocal<ThreadLocalPRNG::LocalInstancePRNG> localInstance;
+ local_ = localInstance.get();
}
uint32_t ThreadLocalPRNG::getImpl(LocalInstancePRNG* local) {