Home | History | Annotate | Download | only in base 
      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/rand_util.h"
      6 
      7 #include <stdlib.h>
      8 
      9 #include "base/basictypes.h"
     10 #include "base/logging.h"
     11 
     12 namespace {
     13 
     14 uint32 RandUint32() {
     15   uint32 number;
     16   CHECK_EQ(rand_s(&number), 0);
     17   return number;
     18 }
     19 
     20 }  // namespace
     21 
     22 namespace base {
     23 
     24 // NOTE: This function must be cryptographically secure. http://crbug.com/140076
     25 uint64 RandUint64() {
     26   uint32 first_half = RandUint32();
     27   uint32 second_half = RandUint32();
     28   return (static_cast<uint64>(first_half) << 32) + second_half;
     29 }
     30 
     31 }  // namespace base
     32