crypto/random_unittest.cc

   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).
  14 bool 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
  23 TEST(RandBytes, RandBytes) {
  24   std::string bytes(16, '\0');
  25   crypto::RandBytes(base::WriteInto(&bytes, bytes.size()), bytes.size());
  26   EXPECT_TRUE(!IsTrivial(bytes));
  27 }