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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/rand_util.h"
- #include <windows.h>
- #include <stddef.h>
- #include <stdint.h>
- // #define needed to link in RtlGenRandom(), a.k.a. SystemFunction036. See the
- // "Community Additions" comment on MSDN here:
- // http://msdn.microsoft.com/en-us/library/windows/desktop/aa387694.aspx
- #define SystemFunction036 NTAPI SystemFunction036
- #include <NTSecAPI.h>
- #undef SystemFunction036
- #include <algorithm>
- #include <limits>
- #include "base/check.h"
- namespace base {
- void RandBytes(void* output, size_t output_length) {
- char* output_ptr = static_cast<char*>(output);
- while (output_length > 0) {
- const ULONG output_bytes_this_pass = static_cast<ULONG>(std::min(
- output_length, static_cast<size_t>(std::numeric_limits<ULONG>::max())));
- const bool success =
- RtlGenRandom(output_ptr, output_bytes_this_pass) != FALSE;
- CHECK(success);
- output_length -= output_bytes_this_pass;
- output_ptr += output_bytes_this_pass;
- }
- }
- } // namespace base
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