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//===-- Windows implementation of getentropy ------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/unistd/getentropy.h"
#include "hdr/errno_macros.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <bcrypt.h>
#include <ntstatus.h>
#pragma comment(lib, "bcrypt.lib")
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, getentropy, (void *buffer, size_t length)) {
__try {
// check the length limit
if (length > 256)
__leave;
NTSTATUS result = ::BCryptGenRandom(nullptr, static_cast<PUCHAR>(buffer),
static_cast<ULONG>(length),
BCRYPT_USE_SYSTEM_PREFERRED_RNG);
if (result == STATUS_SUCCESS)
return 0;
} __except (EXCEPTION_EXECUTE_HANDLER) {
// no need to handle exceptions specially
}
libc_errno = EIO;
return -1;
}
} // namespace LIBC_NAMESPACE_DECL
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