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 "crypto/random.h"
6
7#include <stddef.h>
8
9#include "base/strings/string_util.h"
10#include "testing/gtest/include/gtest/gtest.h"
11
12// Basic functionality tests. Does NOT test the security of the random data.
13
14// Ensures we don't have all trivial data, i.e. that the data is indeed random.
15// Currently, that means the bytes cannot be all the same (e.g. all zeros).
16bool IsTrivial(const std::string& bytes) {
17  for (size_t i = 0; i < bytes.size(); i++) {
18    if (bytes[i] != bytes[0]) {
19      return false;
20    }
21  }
22  return true;
23}
24
25TEST(RandBytes, RandBytes) {
26  std::string bytes(16, '\0');
27  crypto::RandBytes(base::WriteInto(&bytes, bytes.size()), bytes.size());
28  EXPECT_TRUE(!IsTrivial(bytes));
29}
30