chrome/common/safe_browsing/binary_feature_extractor_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 "chrome/common/safe_browsing/binary_feature_extractor.h"
   6
   7 #include "base/base_paths.h"
   8 #include "base/files/file.h"
   9 #include "base/files/scoped_temp_dir.h"
  10 #include "base/path_service.h"
  11 #include "chrome/common/safe_browsing/csd.pb.h"
  12 #include "crypto/sha2.h"
  13 #include "testing/gtest/include/gtest/gtest.h"
  14
  15 namespace safe_browsing {
  16
  17 class BinaryFeatureExtractorTest : public testing::Test {
  18  protected:
  19   BinaryFeatureExtractorTest() : extractor_(new BinaryFeatureExtractor()) {}
  20
  21   void SetUp() override {
  22     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
  23     path_ = temp_dir_.path().Append(FILE_PATH_LITERAL("file.dll"));
  24   }
  25
  26   // Writes |size| bytes from |data| to |path_|.
  27   void WriteFileToHash(const char* data, int size) {
  28     base::File file(path_, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
  29     ASSERT_TRUE(file.IsValid());
  30     ASSERT_EQ(size, file.WriteAtCurrentPos(data, size));
  31   }
  32
  33   // Verifies that |path_| hashes to |digest|.
  34   void ExpectFileDigestEq(const uint8_t* digest) {
  35     ClientDownloadRequest_Digests digests;
  36     extractor_->ExtractDigest(path_, &digests);
  37     EXPECT_TRUE(digests.has_sha256());
  38     EXPECT_EQ(std::string(reinterpret_cast<const char*>(digest),
  39                           crypto::kSHA256Length),
  40               digests.sha256());
  41   }
  42
  43   static const int kBlockSize = 1 << 12;
  44   scoped_refptr<BinaryFeatureExtractor> extractor_;
  45   base::ScopedTempDir temp_dir_;
  46
  47   // The path to a file that may be hashed.
  48   base::FilePath path_;
  49 };
  50
  51 TEST_F(BinaryFeatureExtractorTest, ExtractDigestNoFile) {
  52   base::FilePath no_file =
  53       temp_dir_.path().Append(FILE_PATH_LITERAL("does_not_exist.dll"));
  54
  55   ClientDownloadRequest_Digests digests;
  56   extractor_->ExtractDigest(no_file, &digests);
  57   EXPECT_FALSE(digests.has_sha256());
  58 }
  59
  60 // Hash a file that is less than 1 4k block.
  61 TEST_F(BinaryFeatureExtractorTest, ExtractSmallDigest) {
  62   static const uint8_t kDigest[] = {
  63       0x70, 0x27, 0x7b, 0xad, 0xfc, 0xb9, 0x97, 0x6b, 0x24, 0xf9, 0x80,
  64       0x22, 0x26, 0x2c, 0x31, 0xea, 0x8f, 0xb2, 0x1f, 0x54, 0x93, 0x6b,
  65       0x69, 0x8b, 0x5d, 0x54, 0xd4, 0xd4, 0x21, 0x0b, 0x98, 0xb7};
  66
  67   static const char kFileData[] = {"The mountains are robotic."};
  68   static const int kDataLen = sizeof(kFileData) - 1;
  69   WriteFileToHash(kFileData, kDataLen);
  70   ExpectFileDigestEq(kDigest);
  71 }
  72
  73 // Hash a file that is exactly 1 4k block.
  74 TEST_F(BinaryFeatureExtractorTest, ExtractOneBlockDigest) {
  75   static const uint8_t kDigest[] = {
  76       0x4f, 0x93, 0x6e, 0xee, 0x89, 0x55, 0xa5, 0xe7, 0x46, 0xd0, 0x61,
  77       0x43, 0x54, 0x5f, 0x33, 0x7b, 0xdc, 0x30, 0x3a, 0x4b, 0x18, 0xb4,
  78       0x82, 0x20, 0xe3, 0x93, 0x4c, 0x65, 0xe0, 0xc1, 0xc0, 0x19};
  79
  80   const int kDataLen = kBlockSize;
  81   scoped_ptr<char[]> data(new char[kDataLen]);
  82   memset(data.get(), 71, kDataLen);
  83   WriteFileToHash(data.get(), kDataLen);
  84   ExpectFileDigestEq(kDigest);
  85 }
  86
  87 // Hash a file that is larger than 1 4k block.
  88 TEST_F(BinaryFeatureExtractorTest, ExtractBigBlockDigest) {
  89   static const uint8_t kDigest[] = {
  90       0xda, 0xae, 0xa0, 0xd5, 0x3b, 0xce, 0x0b, 0x4e, 0x5f, 0x5d, 0x0b,
  91       0xc7, 0x6a, 0x69, 0x0e, 0xf1, 0x8b, 0x2d, 0x20, 0xcd, 0xf2, 0x6d,
  92       0x33, 0xa7, 0x70, 0xf3, 0x6b, 0x85, 0xbf, 0xce, 0x9d, 0x5c};
  93
  94   const int kDataLen = kBlockSize + 1;
  95   scoped_ptr<char[]> data(new char[kDataLen]);
  96   memset(data.get(), 71, kDataLen);
  97   WriteFileToHash(data.get(), kDataLen);
  98   ExpectFileDigestEq(kDigest);
  99 }
 100
 101 }  // namespace safe_browsing