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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 
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).
IsTrivial(const std::string & bytes)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 
TEST(RandBytes,RandBytes)23 TEST(RandBytes, RandBytes) {
24   std::string bytes(16, '\0');
25   crypto::RandBytes(WriteInto(&bytes, bytes.size()), bytes.size());
26   EXPECT_TRUE(!IsTrivial(bytes));
27 }
28