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-rw-r--r--ipc/chromium/src/base/rand_util_win.cc46
1 files changed, 46 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/rand_util_win.cc b/ipc/chromium/src/base/rand_util_win.cc
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+++ b/ipc/chromium/src/base/rand_util_win.cc
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// 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/logging.h"
+
+namespace base {
+
+// NOTE: This function must be cryptographically secure. http://crbug.com/140076
+uint64_t RandUint64() {
+ uint64_t number;
+ RandBytes(&number, sizeof(number));
+ return number;
+}
+
+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