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