1 files changed, 38 insertions, 0 deletions
diff --git a/security/sandbox/chromium/base/rand_util_win.cc b/security/sandbox/chromium/base/rand_util_win.cc
new file mode 100644
index 0000000000..193a3f63a3
--- /dev/null
+++ b/security/sandbox/chromium/base/rand_util_win.cc
@@ -0,0 +1,38 @@
+// 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 {
+
+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