random_unittest.cc 897 B

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