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