src/extensions/browser/computed_hashes_unittest.cc

   1 // Copyright 2014 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 "base/base64.h"
   6 #include "base/files/file_path.h"
   7 #include "base/files/scoped_temp_dir.h"
   8 #include "crypto/sha2.h"
   9 #include "extensions/browser/computed_hashes.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11
  12 namespace {
  13
  14 // Helper to return base64 encode result by value.
  15 std::string Base64Encode(const std::string& data) {
  16   std::string result;
  17   base::Base64Encode(data, &result);
  18   return result;
  19 }
  20
  21 }  // namespace
  22
  23 namespace extensions {
  24
  25 TEST(ComputedHashes, ComputedHashes) {
  26   base::ScopedTempDir scoped_dir;
  27   ASSERT_TRUE(scoped_dir.CreateUniqueTempDir());
  28   base::FilePath computed_hashes =
  29       scoped_dir.path().AppendASCII("computed_hashes.json");
  30
  31   // We'll add hashes for 2 files, one of which uses a subdirectory
  32   // path. The first file will have a list of 1 block hash, and the
  33   // second file will have 2 block hashes.
  34   base::FilePath path1(FILE_PATH_LITERAL("foo.txt"));
  35   base::FilePath path2 =
  36       base::FilePath(FILE_PATH_LITERAL("foo")).AppendASCII("bar.txt");
  37   std::vector<std::string> hashes1;
  38   std::vector<std::string> hashes2;
  39   hashes1.push_back(crypto::SHA256HashString("first"));
  40   hashes2.push_back(crypto::SHA256HashString("second"));
  41   hashes2.push_back(crypto::SHA256HashString("third"));
  42
  43   // Write them into the file.
  44   ComputedHashes::Writer writer;
  45   writer.AddHashes(path1, 4096, hashes1);
  46   writer.AddHashes(path2, 2048, hashes2);
  47   EXPECT_TRUE(writer.WriteToFile(computed_hashes));
  48
  49   // Now read them back again and assert that we got what we wrote.
  50   ComputedHashes::Reader reader;
  51   std::vector<std::string> read_hashes1;
  52   std::vector<std::string> read_hashes2;
  53   EXPECT_TRUE(reader.InitFromFile(computed_hashes));
  54
  55   int block_size = 0;
  56   EXPECT_TRUE(reader.GetHashes(path1, &block_size, &read_hashes1));
  57   EXPECT_EQ(block_size, 4096);
  58   block_size = 0;
  59   EXPECT_TRUE(reader.GetHashes(path2, &block_size, &read_hashes2));
  60   EXPECT_EQ(block_size, 2048);
  61
  62   EXPECT_EQ(hashes1, read_hashes1);
  63   EXPECT_EQ(hashes2, read_hashes2);
  64
  65   // Finally make sure that we can retrieve the hashes for the subdir
  66   // path even when that path contains forward slashes (on windows).
  67   base::FilePath path2_fwd_slashes =
  68       base::FilePath::FromUTF8Unsafe("foo/bar.txt");
  69   block_size = 0;
  70   EXPECT_TRUE(reader.GetHashes(path2_fwd_slashes, &block_size, &read_hashes2));
  71   EXPECT_EQ(hashes2, read_hashes2);
  72 }
  73
  74 // Note: the expected hashes used in this test were generated using linux
  75 // command line tools. E.g., from a bash prompt:
  76 //  $ printf "hello world" | openssl dgst -sha256 -binary | base64
  77 //
  78 // The file with multiple-blocks expectations were generated by doing:
  79 // $ for i in `seq 500 ; do printf "hello world" ; done > hello.txt
  80 // $ dd if=hello.txt bs=4096 count=1 | openssl dgst -sha256 -binary | base64
  81 // $ dd if=hello.txt skip=1 bs=4096 count=1 |
  82 //   openssl dgst -sha256 -binary | base64
  83 TEST(ComputedHashes, ComputeHashesForContent) {
  84   const int block_size = 4096;
  85
  86   // Simple short input.
  87   std::string content1 = "hello world";
  88   std::string content1_expected_hash =
  89       "uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek=";
  90   std::vector<std::string> hashes1;
  91   ComputedHashes::ComputeHashesForContent(content1, block_size, &hashes1);
  92   ASSERT_EQ(1u, hashes1.size());
  93   EXPECT_EQ(content1_expected_hash, Base64Encode(hashes1[0]));
  94
  95   // Multiple blocks input.
  96   std::string content2;
  97   for (int i = 0; i < 500; i++)
  98     content2 += "hello world";
  99   const char* content2_expected_hashes[] = {
 100       "bvtt5hXo8xvHrlzGAhhoqPL/r+4zJXHx+6wAvkv15V8=",
 101       "lTD45F7P6I/HOdi8u7FLRA4qzAYL+7xSNVeusG6MJI0="};
 102   std::vector<std::string> hashes2;
 103   ComputedHashes::ComputeHashesForContent(content2, block_size, &hashes2);
 104   ASSERT_EQ(2u, hashes2.size());
 105   EXPECT_EQ(content2_expected_hashes[0], Base64Encode(hashes2[0]));
 106   EXPECT_EQ(content2_expected_hashes[1], Base64Encode(hashes2[1]));
 107
 108   // Now an empty input.
 109   std::string content3;
 110   std::vector<std::string> hashes3;
 111   ComputedHashes::ComputeHashesForContent(content3, block_size, &hashes3);
 112   ASSERT_EQ(1u, hashes3.size());
 113   ASSERT_EQ(std::string("47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU="),
 114             Base64Encode(hashes3[0]));
 115 }
 116
 117 }  // namespace extensions