biod/cros_fp_biometrics_manager_test.cc - mirrors/cros/chromiumos/platform2 - Git at Google

 // Copyright 2019 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "biod/cros_fp_biometrics_manager.h"

 #include <algorithm>
 #include <utility>

 #include <base/bind.h>
 #include <dbus/mock_bus.h>
 #include <dbus/mock_object_proxy.h>
 #include <gtest/gtest.h>

 #include "biod/cros_fp_device_interface.h"

 namespace biod {

 namespace {
 constexpr int kMaxTemplateCount = 5;
 constexpr char kRecordID[] = "record0";
 constexpr char kUserID[] = "0123456789";
 constexpr char kLabel[] = "label0";
 const std::vector<uint8_t> kFakePositiveMatchSecret1 = {0x00, 0x01, 0x02};
 const std::vector<uint8_t> kFakePositiveMatchSecret2 = {0xcc, 0xdd, 0xee, 0xff};
 // Validation value corresponding to kFakePositiveMatchSecret1 and kUserID.
 const std::vector<uint8_t> kFakeValidationValue1 = {
     0x90, 0xea, 0xfb, 0x75, 0xee, 0x37, 0xeb, 0xb1, 0xb5, 0xe7, 0x81,
     0x47, 0xac, 0xdd, 0xff, 0xbe, 0x20, 0x59, 0x25, 0x24, 0x82, 0xe0,
     0x05, 0xdd, 0x95, 0x09, 0x8e, 0x5a, 0xdc, 0xcc, 0x12, 0x9f,
 };
 // Validation value corresponding to kFakePositiveMatchSecret2 and kUserID.
 const std::vector<uint8_t> kFakeValidationValue2 = {
     0xde, 0xe9, 0x4d, 0xbd, 0xbe, 0x63, 0x8b, 0x9e, 0xc9, 0x25, 0x27,
     0xf1, 0xf6, 0x86, 0x6f, 0xb3, 0x31, 0xf6, 0xb6, 0x52, 0x99, 0x66,
     0x89, 0x88, 0x73, 0x0a, 0xd4, 0x0b, 0xd2, 0x34, 0x7b, 0x71,
 };
 }  // namespace

 class FakeCrosFpDevice : public CrosFpDeviceInterface {
  public:
   FakeCrosFpDevice() { positive_match_secret_ = kFakePositiveMatchSecret1; }
   // CrosFpDeviceInterface overrides:
   ~FakeCrosFpDevice() override = default;

   bool SetFpMode(const FpMode& mode) override { return false; }
   bool GetFpMode(FpMode* mode) override { return false; }
   bool GetFpStats(int* capture_ms, int* matcher_ms, int* overall_ms) override {
     return false;
   }
   bool GetDirtyMap(std::bitset<32>* bitmap) override { return false; }
   bool SupportsPositiveMatchSecret() override { return true; }
   bool GetPositiveMatchSecret(int index, brillo::SecureBlob* secret) override {
     if (positive_match_secret_.empty())
       return false;
     secret->resize(FP_POSITIVE_MATCH_SECRET_BYTES);
     // Zero-pad the secret if it's too short.
     std::fill(secret->begin(), secret->end(), 0);
     std::copy(positive_match_secret_.begin(), positive_match_secret_.end(),
               secret->begin());
     return true;
   }
   bool GetTemplate(int index, VendorTemplate* out) override { return true; }
   bool UploadTemplate(const VendorTemplate& tmpl) override { return false; }
   bool SetContext(std::string user_id) override { return false; }
   bool ResetContext() override { return false; }
   bool InitEntropy(bool reset) override { return false; }

   int MaxTemplateCount() override { return kMaxTemplateCount; }
   int TemplateVersion() override { return FP_TEMPLATE_FORMAT_VERSION; }

   EcCmdVersionSupportStatus EcCmdVersionSupported(uint16_t cmd,
                                                   uint32_t ver) override {
     return EcCmdVersionSupportStatus::UNSUPPORTED;
   }

  private:
   friend class CrosFpBiometricsManagerPeer;
   std::vector<uint8_t> positive_match_secret_;
 };

 class FakeCrosFpDeviceFactoryImpl : public CrosFpDeviceFactory {
   std::unique_ptr<CrosFpDeviceInterface> Create(
       const MkbpCallback& callback, BiodMetrics* biod_metrics) override {
     return std::make_unique<FakeCrosFpDevice>();
   }
 };

 // Using a peer class to control access to the class under test is better than
 // making the text fixture a friend class.
 class CrosFpBiometricsManagerPeer {
  public:
   CrosFpBiometricsManagerPeer() {
     dbus::Bus::Options options;
     options.bus_type = dbus::Bus::SYSTEM;
     const scoped_refptr<dbus::MockBus> mock_bus = new dbus::MockBus(options);

     // Set EXPECT_CALL, otherwise gmock forces an failure due to "uninteresting
     // call" because we use StrictMock.
     // https://github.com/google/googletest/blob/fb49e6c164490a227bbb7cf5223b846c836a0305/googlemock/docs/cook_book.md#the-nice-the-strict-and-the-naggy-nicestrictnaggy
     const scoped_refptr<dbus::MockObjectProxy> power_manager_proxy =
         new dbus::MockObjectProxy(
             mock_bus.get(), power_manager::kPowerManagerServiceName,
             dbus::ObjectPath(power_manager::kPowerManagerServicePath));
     EXPECT_CALL(*mock_bus,
                 GetObjectProxy(
                     power_manager::kPowerManagerServiceName,
                     dbus::ObjectPath(power_manager::kPowerManagerServicePath)))
         .WillOnce(testing::Return(power_manager_proxy.get()));

     cros_fp_biometrics_manager_ = CrosFpBiometricsManager::Create(
         mock_bus, std::make_unique<FakeCrosFpDeviceFactoryImpl>());
     // Keep a pointer to the fake device to manipulate it later.
     fake_cros_dev_ = static_cast<FakeCrosFpDevice*>(
         cros_fp_biometrics_manager_->cros_dev_.get());
   }

   // Methods to access or modify the fake device.

   void SetDevicePositiveMatchSecret(const std::vector<uint8_t>& new_secret) {
     fake_cros_dev_->positive_match_secret_ = new_secret;
   }

   // Methods to access or modify CrosFpBiometricsManager private fields.

   bool SupportsPositiveMatchSecret() {
     return cros_fp_biometrics_manager_->use_positive_match_secret_;
   }

   void SetUsePositiveMatchSecret(bool use) {
     cros_fp_biometrics_manager_->use_positive_match_secret_ = use;
   }

   // Add a record to cros_fp_biometrics_manager_, return the index.
   int AddRecord(int record_format_version,
                 const std::string& record_id,
                 const std::string& user_id,
                 const std::string& label,
                 const std::vector<uint8_t>& validation_value) {
     CrosFpBiometricsManager::InternalRecord internal_record = {
         record_format_version, record_id, user_id, label, validation_value};
     cros_fp_biometrics_manager_->records_.emplace_back(
         std::move(internal_record));
     return cros_fp_biometrics_manager_->records_.size() - 1;
   }

   bool ValidationValueEquals(int index,
                              const std::vector<uint8_t>& reference_value) {
     return cros_fp_biometrics_manager_->records_[index].validation_val ==
            reference_value;
   }

   // Methods to execute CrosFpBiometricsManager private methods.

   bool ComputeValidationValue(const std::vector<uint8_t>& secret,
                               const std::string& user_id,
                               std::vector<uint8_t>* out) {
     const brillo::SecureBlob secret_blob(secret);
     return cros_fp_biometrics_manager_->ComputeValidationValue(secret_blob,
                                                                user_id, out);
   }

   bool ValidationValueIsCorrect(uint32_t match_idx) {
     return cros_fp_biometrics_manager_->ValidationValueIsCorrect(match_idx);
   }

   BiometricsManager::AttemptMatches CalculateMatches(int match_idx,
                                                      bool matched) {
     return cros_fp_biometrics_manager_->CalculateMatches(match_idx, matched);
   }

   bool MigrateToValidationValue(int match_idx) {
     CrosFpBiometricsManager::MigrationStatus status =
         cros_fp_biometrics_manager_->MigrateToValidationValue(match_idx);
     return status == CrosFpBiometricsManager::MigrationStatus::kSuccess;
   }

   static void InsertEmptyPositiveMatchSalt(VendorTemplate* tmpl) {
     CrosFpBiometricsManager::InsertEmptyPositiveMatchSalt(tmpl);
   }

   bool RecordNeedsValidationValue(int index) {
     CrosFpBiometricsManager::Record current_record(
         cros_fp_biometrics_manager_->weak_factory_.GetWeakPtr(), index);
     return current_record.NeedsNewValidationValue();
   }

  private:
   std::unique_ptr<CrosFpBiometricsManager> cros_fp_biometrics_manager_;
   FakeCrosFpDevice* fake_cros_dev_;
 };

 class CrosFpBiometricsManagerTest : public ::testing::Test {
  public:
   bool BytesAreZeros(const uint8_t* start, size_t size) {
     const std::vector<uint8_t> zeros(size);
     return std::memcmp(start, zeros.data(), size) == 0;
   }

  protected:
   CrosFpBiometricsManagerPeer cros_fp_biometrics_manager_peer_;
 };

 TEST_F(CrosFpBiometricsManagerTest, TestComputeValidationValue) {
   EXPECT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
   const std::vector<std::pair<std::vector<uint8_t>, std::vector<uint8_t>>>
       kSecretValidationValuePairs = {
           std::make_pair(kFakePositiveMatchSecret1, kFakeValidationValue1),
           std::make_pair(kFakePositiveMatchSecret2, kFakeValidationValue2),
       };
   for (const auto& pair : kSecretValidationValuePairs) {
     std::vector<uint8_t> validation_value;
     EXPECT_TRUE(cros_fp_biometrics_manager_peer_.ComputeValidationValue(
         pair.first, kUserID, &validation_value));
     EXPECT_EQ(validation_value, pair.second);
   }
 }

 TEST_F(CrosFpBiometricsManagerTest, TestValidationValueIsCorrect) {
   ASSERT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
   cros_fp_biometrics_manager_peer_.SetDevicePositiveMatchSecret(
       kFakePositiveMatchSecret1);
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
   bool ret = cros_fp_biometrics_manager_peer_.ValidationValueIsCorrect(index);
   EXPECT_TRUE(ret);

   // Make the device return a wrong positive_match_secret.
   cros_fp_biometrics_manager_peer_.SetDevicePositiveMatchSecret(
       kFakePositiveMatchSecret2);
   ret = cros_fp_biometrics_manager_peer_.ValidationValueIsCorrect(index);
   EXPECT_FALSE(ret);
 }

 TEST_F(CrosFpBiometricsManagerTest, TestCalculateMatchesNotMatched) {
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
   BiometricsManager::AttemptMatches matches =
       cros_fp_biometrics_manager_peer_.CalculateMatches(index, false);
   // If matched is false then we should report no matches.
   EXPECT_TRUE(matches.empty());
 }

 TEST_F(CrosFpBiometricsManagerTest, TestCalculateMatchesInvalidIndex) {
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
   BiometricsManager::AttemptMatches matches =
       cros_fp_biometrics_manager_peer_.CalculateMatches(index + 1, true);
   // If index is invalid then we should report no matches.
   EXPECT_TRUE(matches.empty());
 }

 TEST_F(CrosFpBiometricsManagerTest,
        TestCalculateMatchesWithPositiveMatchSecret) {
   ASSERT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
   BiometricsManager::AttemptMatches matches =
       cros_fp_biometrics_manager_peer_.CalculateMatches(index, true);
   EXPECT_EQ(matches,
             BiometricsManager::AttemptMatches({{kUserID, {kRecordID}}}));
 }

 TEST_F(CrosFpBiometricsManagerTest,
        TestCalculateMatchesWithoutPositiveMatchSecret) {
   // If not supporting positive match secret, we should just report matches.
   cros_fp_biometrics_manager_peer_.SetUsePositiveMatchSecret(false);
   ASSERT_FALSE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
   BiometricsManager::AttemptMatches matches =
       cros_fp_biometrics_manager_peer_.CalculateMatches(index, true);
   EXPECT_EQ(matches,
             BiometricsManager::AttemptMatches({{kUserID, {kRecordID}}}));
 }

 TEST_F(CrosFpBiometricsManagerTest, TestCalculateMatchesOnMigration) {
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersionNoValidationValue, kRecordID, kUserID, kLabel,
       std::vector<uint8_t>());

   // IF firmware supports positive match secret but the record does not have
   // validation value:
   EXPECT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
   EXPECT_TRUE(
       cros_fp_biometrics_manager_peer_.RecordNeedsValidationValue(index));

   // THEN we accept the match since we are going to do migration.
   auto matches = cros_fp_biometrics_manager_peer_.CalculateMatches(index, true);
   EXPECT_EQ(matches,
             BiometricsManager::AttemptMatches({{kUserID, {kRecordID}}}));
 }

 TEST_F(CrosFpBiometricsManagerTest, TestMigrateToValidationValue) {
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersion, kRecordID, kUserID, kLabel, std::vector<uint8_t>());
   bool ret = cros_fp_biometrics_manager_peer_.MigrateToValidationValue(index);
   EXPECT_TRUE(ret);
   // After migration, the record at |index| should have the validation value
   // corresponding to the device's positive match secret.
   EXPECT_TRUE(cros_fp_biometrics_manager_peer_.ValidationValueEquals(
       index, kFakeValidationValue1));
 }

 TEST_F(CrosFpBiometricsManagerTest, TestMigrateToValidationValueFailures) {
   int index = cros_fp_biometrics_manager_peer_.AddRecord(
       kRecordFormatVersion, kRecordID, kUserID, kLabel, std::vector<uint8_t>());

   // Setting the devices positive match secret to empty will make the fake
   // device return false when asked for positive match secret.
   cros_fp_biometrics_manager_peer_.SetDevicePositiveMatchSecret(
       std::vector<uint8_t>());
   EXPECT_FALSE(
       cros_fp_biometrics_manager_peer_.MigrateToValidationValue(index));
 }

 TEST_F(CrosFpBiometricsManagerTest, TestInsertEmptyPositiveMatchSalt) {
   // Prepare a template of old format, with zero-length template field.
   size_t metadata_size = sizeof(struct ec_fp_template_encryption_metadata);
   std::vector<uint8_t> tmpl(metadata_size, 0xff);

   CrosFpBiometricsManagerPeer::InsertEmptyPositiveMatchSalt(&tmpl);

   EXPECT_EQ(tmpl.size(), metadata_size + FP_POSITIVE_MATCH_SALT_BYTES);
   EXPECT_TRUE(
       BytesAreZeros(tmpl.data() + metadata_size, FP_POSITIVE_MATCH_SALT_BYTES));
 }

 }  // namespace biod
	// Copyright 2019 The Chromium OS Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "biod/cros_fp_biometrics_manager.h"

	#include <algorithm>
	#include <utility>

	#include <base/bind.h>
	#include <dbus/mock_bus.h>
	#include <dbus/mock_object_proxy.h>
	#include <gtest/gtest.h>

	#include "biod/cros_fp_device_interface.h"

	namespace biod {

	namespace {
	constexpr int kMaxTemplateCount = 5;
	constexpr char kRecordID[] = "record0";
	constexpr char kUserID[] = "0123456789";
	constexpr char kLabel[] = "label0";
	const std::vector<uint8_t> kFakePositiveMatchSecret1 = {0x00, 0x01, 0x02};
	const std::vector<uint8_t> kFakePositiveMatchSecret2 = {0xcc, 0xdd, 0xee, 0xff};
	// Validation value corresponding to kFakePositiveMatchSecret1 and kUserID.
	const std::vector<uint8_t> kFakeValidationValue1 = {
	0x90, 0xea, 0xfb, 0x75, 0xee, 0x37, 0xeb, 0xb1, 0xb5, 0xe7, 0x81,
	0x47, 0xac, 0xdd, 0xff, 0xbe, 0x20, 0x59, 0x25, 0x24, 0x82, 0xe0,
	0x05, 0xdd, 0x95, 0x09, 0x8e, 0x5a, 0xdc, 0xcc, 0x12, 0x9f,
	};
	// Validation value corresponding to kFakePositiveMatchSecret2 and kUserID.
	const std::vector<uint8_t> kFakeValidationValue2 = {
	0xde, 0xe9, 0x4d, 0xbd, 0xbe, 0x63, 0x8b, 0x9e, 0xc9, 0x25, 0x27,
	0xf1, 0xf6, 0x86, 0x6f, 0xb3, 0x31, 0xf6, 0xb6, 0x52, 0x99, 0x66,
	0x89, 0x88, 0x73, 0x0a, 0xd4, 0x0b, 0xd2, 0x34, 0x7b, 0x71,
	};
	} // namespace

	class FakeCrosFpDevice : public CrosFpDeviceInterface {
	public:
	FakeCrosFpDevice() { positive_match_secret_ = kFakePositiveMatchSecret1; }
	// CrosFpDeviceInterface overrides:
	~FakeCrosFpDevice() override = default;

	bool SetFpMode(const FpMode& mode) override { return false; }
	bool GetFpMode(FpMode* mode) override { return false; }
	bool GetFpStats(int* capture_ms, int* matcher_ms, int* overall_ms) override {
	return false;
	}
	bool GetDirtyMap(std::bitset<32>* bitmap) override { return false; }
	bool SupportsPositiveMatchSecret() override { return true; }
	bool GetPositiveMatchSecret(int index, brillo::SecureBlob* secret) override {
	if (positive_match_secret_.empty())
	return false;
	secret->resize(FP_POSITIVE_MATCH_SECRET_BYTES);
	// Zero-pad the secret if it's too short.
	std::fill(secret->begin(), secret->end(), 0);
	std::copy(positive_match_secret_.begin(), positive_match_secret_.end(),
	secret->begin());
	return true;
	}
	bool GetTemplate(int index, VendorTemplate* out) override { return true; }
	bool UploadTemplate(const VendorTemplate& tmpl) override { return false; }
	bool SetContext(std::string user_id) override { return false; }
	bool ResetContext() override { return false; }
	bool InitEntropy(bool reset) override { return false; }

	int MaxTemplateCount() override { return kMaxTemplateCount; }
	int TemplateVersion() override { return FP_TEMPLATE_FORMAT_VERSION; }

	EcCmdVersionSupportStatus EcCmdVersionSupported(uint16_t cmd,
	uint32_t ver) override {
	return EcCmdVersionSupportStatus::UNSUPPORTED;
	}

	private:
	friend class CrosFpBiometricsManagerPeer;
	std::vector<uint8_t> positive_match_secret_;
	};

	class FakeCrosFpDeviceFactoryImpl : public CrosFpDeviceFactory {
	std::unique_ptr<CrosFpDeviceInterface> Create(
	const MkbpCallback& callback, BiodMetrics* biod_metrics) override {
	return std::make_unique<FakeCrosFpDevice>();
	}
	};

	// Using a peer class to control access to the class under test is better than
	// making the text fixture a friend class.
	class CrosFpBiometricsManagerPeer {
	public:
	CrosFpBiometricsManagerPeer() {
	dbus::Bus::Options options;
	options.bus_type = dbus::Bus::SYSTEM;
	const scoped_refptr<dbus::MockBus> mock_bus = new dbus::MockBus(options);

	// Set EXPECT_CALL, otherwise gmock forces an failure due to "uninteresting
	// call" because we use StrictMock.
	// https://github.com/google/googletest/blob/fb49e6c164490a227bbb7cf5223b846c836a0305/googlemock/docs/cook_book.md#the-nice-the-strict-and-the-naggy-nicestrictnaggy
	const scoped_refptr<dbus::MockObjectProxy> power_manager_proxy =
	new dbus::MockObjectProxy(
	mock_bus.get(), power_manager::kPowerManagerServiceName,
	dbus::ObjectPath(power_manager::kPowerManagerServicePath));
	EXPECT_CALL(*mock_bus,
	GetObjectProxy(
	power_manager::kPowerManagerServiceName,
	dbus::ObjectPath(power_manager::kPowerManagerServicePath)))
	.WillOnce(testing::Return(power_manager_proxy.get()));

	cros_fp_biometrics_manager_ = CrosFpBiometricsManager::Create(
	mock_bus, std::make_unique<FakeCrosFpDeviceFactoryImpl>());
	// Keep a pointer to the fake device to manipulate it later.
	fake_cros_dev_ = static_cast<FakeCrosFpDevice*>(
	cros_fp_biometrics_manager_->cros_dev_.get());
	}

	// Methods to access or modify the fake device.

	void SetDevicePositiveMatchSecret(const std::vector<uint8_t>& new_secret) {
	fake_cros_dev_->positive_match_secret_ = new_secret;
	}

	// Methods to access or modify CrosFpBiometricsManager private fields.

	bool SupportsPositiveMatchSecret() {
	return cros_fp_biometrics_manager_->use_positive_match_secret_;
	}

	void SetUsePositiveMatchSecret(bool use) {
	cros_fp_biometrics_manager_->use_positive_match_secret_ = use;
	}

	// Add a record to cros_fp_biometrics_manager_, return the index.
	int AddRecord(int record_format_version,
	const std::string& record_id,
	const std::string& user_id,
	const std::string& label,
	const std::vector<uint8_t>& validation_value) {
	CrosFpBiometricsManager::InternalRecord internal_record = {
	record_format_version, record_id, user_id, label, validation_value};
	cros_fp_biometrics_manager_->records_.emplace_back(
	std::move(internal_record));
	return cros_fp_biometrics_manager_->records_.size() - 1;
	}

	bool ValidationValueEquals(int index,
	const std::vector<uint8_t>& reference_value) {
	return cros_fp_biometrics_manager_->records_[index].validation_val ==
	reference_value;
	}

	// Methods to execute CrosFpBiometricsManager private methods.

	bool ComputeValidationValue(const std::vector<uint8_t>& secret,
	const std::string& user_id,
	std::vector<uint8_t>* out) {
	const brillo::SecureBlob secret_blob(secret);
	return cros_fp_biometrics_manager_->ComputeValidationValue(secret_blob,
	user_id, out);
	}

	bool ValidationValueIsCorrect(uint32_t match_idx) {
	return cros_fp_biometrics_manager_->ValidationValueIsCorrect(match_idx);
	}

	BiometricsManager::AttemptMatches CalculateMatches(int match_idx,
	bool matched) {
	return cros_fp_biometrics_manager_->CalculateMatches(match_idx, matched);
	}

	bool MigrateToValidationValue(int match_idx) {
	CrosFpBiometricsManager::MigrationStatus status =
	cros_fp_biometrics_manager_->MigrateToValidationValue(match_idx);
	return status == CrosFpBiometricsManager::MigrationStatus::kSuccess;
	}

	static void InsertEmptyPositiveMatchSalt(VendorTemplate* tmpl) {
	CrosFpBiometricsManager::InsertEmptyPositiveMatchSalt(tmpl);
	}

	bool RecordNeedsValidationValue(int index) {
	CrosFpBiometricsManager::Record current_record(
	cros_fp_biometrics_manager_->weak_factory_.GetWeakPtr(), index);
	return current_record.NeedsNewValidationValue();
	}

	private:
	std::unique_ptr<CrosFpBiometricsManager> cros_fp_biometrics_manager_;
	FakeCrosFpDevice* fake_cros_dev_;
	};

	class CrosFpBiometricsManagerTest : public ::testing::Test {
	public:
	bool BytesAreZeros(const uint8_t* start, size_t size) {
	const std::vector<uint8_t> zeros(size);
	return std::memcmp(start, zeros.data(), size) == 0;
	}

	protected:
	CrosFpBiometricsManagerPeer cros_fp_biometrics_manager_peer_;
	};

	TEST_F(CrosFpBiometricsManagerTest, TestComputeValidationValue) {
	EXPECT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
	const std::vector<std::pair<std::vector<uint8_t>, std::vector<uint8_t>>>
	kSecretValidationValuePairs = {
	std::make_pair(kFakePositiveMatchSecret1, kFakeValidationValue1),
	std::make_pair(kFakePositiveMatchSecret2, kFakeValidationValue2),
	};
	for (const auto& pair : kSecretValidationValuePairs) {
	std::vector<uint8_t> validation_value;
	EXPECT_TRUE(cros_fp_biometrics_manager_peer_.ComputeValidationValue(
	pair.first, kUserID, &validation_value));
	EXPECT_EQ(validation_value, pair.second);
	}
	}

	TEST_F(CrosFpBiometricsManagerTest, TestValidationValueIsCorrect) {
	ASSERT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
	cros_fp_biometrics_manager_peer_.SetDevicePositiveMatchSecret(
	kFakePositiveMatchSecret1);
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
	bool ret = cros_fp_biometrics_manager_peer_.ValidationValueIsCorrect(index);
	EXPECT_TRUE(ret);

	// Make the device return a wrong positive_match_secret.
	cros_fp_biometrics_manager_peer_.SetDevicePositiveMatchSecret(
	kFakePositiveMatchSecret2);
	ret = cros_fp_biometrics_manager_peer_.ValidationValueIsCorrect(index);
	EXPECT_FALSE(ret);
	}

	TEST_F(CrosFpBiometricsManagerTest, TestCalculateMatchesNotMatched) {
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
	BiometricsManager::AttemptMatches matches =
	cros_fp_biometrics_manager_peer_.CalculateMatches(index, false);
	// If matched is false then we should report no matches.
	EXPECT_TRUE(matches.empty());
	}

	TEST_F(CrosFpBiometricsManagerTest, TestCalculateMatchesInvalidIndex) {
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
	BiometricsManager::AttemptMatches matches =
	cros_fp_biometrics_manager_peer_.CalculateMatches(index + 1, true);
	// If index is invalid then we should report no matches.
	EXPECT_TRUE(matches.empty());
	}

	TEST_F(CrosFpBiometricsManagerTest,
	TestCalculateMatchesWithPositiveMatchSecret) {
	ASSERT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
	BiometricsManager::AttemptMatches matches =
	cros_fp_biometrics_manager_peer_.CalculateMatches(index, true);
	EXPECT_EQ(matches,
	BiometricsManager::AttemptMatches({{kUserID, {kRecordID}}}));
	}

	TEST_F(CrosFpBiometricsManagerTest,
	TestCalculateMatchesWithoutPositiveMatchSecret) {
	// If not supporting positive match secret, we should just report matches.
	cros_fp_biometrics_manager_peer_.SetUsePositiveMatchSecret(false);
	ASSERT_FALSE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersion, kRecordID, kUserID, kLabel, kFakeValidationValue1);
	BiometricsManager::AttemptMatches matches =
	cros_fp_biometrics_manager_peer_.CalculateMatches(index, true);
	EXPECT_EQ(matches,
	BiometricsManager::AttemptMatches({{kUserID, {kRecordID}}}));
	}

	TEST_F(CrosFpBiometricsManagerTest, TestCalculateMatchesOnMigration) {
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersionNoValidationValue, kRecordID, kUserID, kLabel,
	std::vector<uint8_t>());

	// IF firmware supports positive match secret but the record does not have
	// validation value:
	EXPECT_TRUE(cros_fp_biometrics_manager_peer_.SupportsPositiveMatchSecret());
	EXPECT_TRUE(
	cros_fp_biometrics_manager_peer_.RecordNeedsValidationValue(index));

	// THEN we accept the match since we are going to do migration.
	auto matches = cros_fp_biometrics_manager_peer_.CalculateMatches(index, true);
	EXPECT_EQ(matches,
	BiometricsManager::AttemptMatches({{kUserID, {kRecordID}}}));
	}

	TEST_F(CrosFpBiometricsManagerTest, TestMigrateToValidationValue) {
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersion, kRecordID, kUserID, kLabel, std::vector<uint8_t>());
	bool ret = cros_fp_biometrics_manager_peer_.MigrateToValidationValue(index);
	EXPECT_TRUE(ret);
	// After migration, the record at \|index\| should have the validation value
	// corresponding to the device's positive match secret.
	EXPECT_TRUE(cros_fp_biometrics_manager_peer_.ValidationValueEquals(
	index, kFakeValidationValue1));
	}

	TEST_F(CrosFpBiometricsManagerTest, TestMigrateToValidationValueFailures) {
	int index = cros_fp_biometrics_manager_peer_.AddRecord(
	kRecordFormatVersion, kRecordID, kUserID, kLabel, std::vector<uint8_t>());

	// Setting the devices positive match secret to empty will make the fake
	// device return false when asked for positive match secret.
	cros_fp_biometrics_manager_peer_.SetDevicePositiveMatchSecret(
	std::vector<uint8_t>());
	EXPECT_FALSE(
	cros_fp_biometrics_manager_peer_.MigrateToValidationValue(index));
	}

	TEST_F(CrosFpBiometricsManagerTest, TestInsertEmptyPositiveMatchSalt) {
	// Prepare a template of old format, with zero-length template field.
	size_t metadata_size = sizeof(struct ec_fp_template_encryption_metadata);
	std::vector<uint8_t> tmpl(metadata_size, 0xff);

	CrosFpBiometricsManagerPeer::InsertEmptyPositiveMatchSalt(&tmpl);

	EXPECT_EQ(tmpl.size(), metadata_size + FP_POSITIVE_MATCH_SALT_BYTES);
	EXPECT_TRUE(
	BytesAreZeros(tmpl.data() + metadata_size, FP_POSITIVE_MATCH_SALT_BYTES));
	}

	} // namespace biod