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 <nacl/nacl_random.h>
8
9#include "base/basictypes.h"
10#include "base/logging.h"
11
12namespace {
13
14void GetRandomBytes(void* output, size_t num_bytes) {
15  char* output_ptr = static_cast<char*>(output);
16  while (num_bytes > 0) {
17    size_t nread;
18    const int error = nacl_secure_random(output_ptr, num_bytes, &nread);
19    CHECK_EQ(error, 0);
20    CHECK_LE(nread, num_bytes);
21    output_ptr += nread;
22    num_bytes -= nread;
23  }
24}
25
26}  // namespace
27
28namespace base {
29
30// NOTE: This function must be cryptographically secure. http://crbug.com/140076
31uint64 RandUint64() {
32  uint64 result;
33  GetRandomBytes(&result, sizeof(result));
34  return result;
35}
36
37void RandBytes(void* output, size_t output_length) {
38  GetRandomBytes(output, output_length);
39}
40
41}  // namespace base
42