Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "Classifier.h"
#include "HashStore.h"
#include "mozilla/Components.h"
#include "mozilla/Unused.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsICryptoHash.h"
#include "nsIFile.h"
#include "nsThreadUtils.h"
#include "string.h"
#include "LookupCacheV4.h"
#include "nsUrlClassifierUtils.h"
#include "Common.h"
#define GTEST_SAFEBROWSING_DIR "safebrowsing"_ns
#define GTEST_TABLE "gtest-malware-proto"_ns
#define GTEST_PREFIXFILE "gtest-malware-proto.vlpset"_ns
// This function removes common elements of inArray and outArray from
// outArray. This is used by partial update testcase to ensure partial update
// data won't contain prefixes we already have.
static void RemoveIntersection(const _PrefixArray& inArray,
_PrefixArray& outArray) {
for (uint32_t i = 0; i < inArray.Length(); i++) {
int32_t idx = outArray.BinaryIndexOf(inArray[i]);
if (idx >= 0) {
outArray.RemoveElementAt(idx);
}
}
}
// This fucntion removes elements from outArray by index specified in
// removal array.
static void RemoveElements(const nsTArray<uint32_t>& removal,
_PrefixArray& outArray) {
for (int32_t i = removal.Length() - 1; i >= 0; i--) {
outArray.RemoveElementAt(removal[i]);
}
}
static void MergeAndSortArray(const _PrefixArray& array1,
const _PrefixArray& array2,
_PrefixArray& output) {
output.Clear();
output.AppendElements(array1);
output.AppendElements(array2);
output.Sort();
}
static void CalculateSHA256(_PrefixArray& prefixArray, nsCString& sha256) {
prefixArray.Sort();
nsresult rv;
nsCOMPtr<nsICryptoHash> cryptoHash =
do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &rv);
cryptoHash->Init(nsICryptoHash::SHA256);
for (uint32_t i = 0; i < prefixArray.Length(); i++) {
const _Prefix& prefix = prefixArray[i];
cryptoHash->Update(
reinterpret_cast<uint8_t*>(const_cast<char*>(prefix.get())),
prefix.Length());
}
cryptoHash->Finish(false, sha256);
}
// N: Number of prefixes, MIN/MAX: minimum/maximum prefix size
// This function will append generated prefixes to outArray.
static void CreateRandomSortedPrefixArray(uint32_t N, uint32_t MIN,
uint32_t MAX,
_PrefixArray& outArray) {
outArray.SetCapacity(outArray.Length() + N);
const uint32_t range = (MAX - MIN + 1);
for (uint32_t i = 0; i < N; i++) {
uint32_t prefixSize = (rand() % range) + MIN;
_Prefix prefix;
prefix.SetLength(prefixSize);
while (true) {
char* dst = prefix.BeginWriting();
for (uint32_t j = 0; j < prefixSize; j++) {
dst[j] = rand() % 256;
}
if (!outArray.Contains(prefix)) {
outArray.AppendElement(prefix);
break;
}
}
}
outArray.Sort();
}
// N: Number of removal indices, MAX: maximum index
static void CreateRandomRemovalIndices(uint32_t N, uint32_t MAX,
nsTArray<uint32_t>& outArray) {
for (uint32_t i = 0; i < N; i++) {
uint32_t idx = rand() % MAX;
if (!outArray.Contains(idx)) {
outArray.InsertElementSorted(idx);
}
}
}
// Function to generate TableUpdateV4.
static void GenerateUpdateData(bool fullUpdate, PrefixStringMap& add,
nsTArray<uint32_t>* removal, nsCString* sha256,
TableUpdateArray& tableUpdates) {
RefPtr<TableUpdateV4> tableUpdate = new TableUpdateV4(GTEST_TABLE);
tableUpdate->SetFullUpdate(fullUpdate);
for (const auto& entry : add) {
nsCString* pstring = entry.GetWeak();
tableUpdate->NewPrefixes(entry.GetKey(), *pstring);
}
if (removal) {
tableUpdate->NewRemovalIndices(removal->Elements(), removal->Length());
}
if (sha256) {
std::string stdSHA256;
stdSHA256.assign(const_cast<char*>(sha256->BeginReading()),
sha256->Length());
tableUpdate->SetSHA256(stdSHA256);
}
tableUpdates.AppendElement(tableUpdate);
}
static void VerifyPrefixSet(PrefixStringMap& expected) {
// Verify the prefix set is written to disk.
nsCOMPtr<nsIFile> file;
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(file));
file->AppendNative(GTEST_SAFEBROWSING_DIR);
RefPtr<LookupCacheV4> lookup =
new LookupCacheV4(GTEST_TABLE, "test"_ns, file);
lookup->Init();
file->AppendNative(GTEST_PREFIXFILE);
lookup->LoadFromFile(file);
PrefixStringMap prefixesInFile;
lookup->GetPrefixes(prefixesInFile);
for (const auto& entry : expected) {
nsCString* expectedPrefix = entry.GetWeak();
nsCString* resultPrefix = prefixesInFile.Get(entry.GetKey());
ASSERT_TRUE(*resultPrefix == *expectedPrefix);
}
}
static void Clear() {
nsCOMPtr<nsIFile> file;
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(file));
RefPtr<Classifier> classifier = new Classifier();
classifier->Open(*file);
classifier->Reset();
}
static void testUpdateFail(TableUpdateArray& tableUpdates) {
nsresult rv = SyncApplyUpdates(tableUpdates);
ASSERT_NS_FAILED(rv);
}
static void testUpdate(TableUpdateArray& tableUpdates,
PrefixStringMap& expected) {
// Force nsUrlClassifierUtils loading on main thread
// because nsIUrlClassifierDBService will not run in advance
// in gtest.
nsUrlClassifierUtils::GetInstance();
nsresult rv = SyncApplyUpdates(tableUpdates);
ASSERT_TRUE(rv == NS_OK);
VerifyPrefixSet(expected);
}
static void testFullUpdate(PrefixStringMap& add, nsCString* sha256) {
TableUpdateArray tableUpdates;
GenerateUpdateData(true, add, nullptr, sha256, tableUpdates);
testUpdate(tableUpdates, add);
}
static void testPartialUpdate(PrefixStringMap& add, nsTArray<uint32_t>* removal,
nsCString* sha256, PrefixStringMap& expected) {
TableUpdateArray tableUpdates;
GenerateUpdateData(false, add, removal, sha256, tableUpdates);
testUpdate(tableUpdates, expected);
}
static void testOpenLookupCache() {
nsCOMPtr<nsIFile> file;
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(file));
file->AppendNative(GTEST_SAFEBROWSING_DIR);
RunTestInNewThread([&]() -> void {
RefPtr<LookupCacheV4> cache =
new LookupCacheV4(nsCString(GTEST_TABLE), ""_ns, file);
nsresult rv = cache->Init();
ASSERT_EQ(rv, NS_OK);
rv = cache->Open();
ASSERT_EQ(rv, NS_OK);
});
}
// Tests start from here.
TEST(UrlClassifierTableUpdateV4, FixLengthPSetFullUpdate)
{
srand(time(NULL));
_PrefixArray array;
PrefixStringMap map;
nsCString sha256;
CreateRandomSortedPrefixArray(5000, 4, 4, array);
PrefixArrayToPrefixStringMap(array, map);
CalculateSHA256(array, sha256);
testFullUpdate(map, &sha256);
Clear();
}
TEST(UrlClassifierTableUpdateV4, VariableLengthPSetFullUpdate)
{
_PrefixArray array;
PrefixStringMap map;
nsCString sha256;
CreateRandomSortedPrefixArray(5000, 5, 32, array);
PrefixArrayToPrefixStringMap(array, map);
CalculateSHA256(array, sha256);
testFullUpdate(map, &sha256);
Clear();
}
// This test contain both variable length prefix set and fixed-length prefix set
TEST(UrlClassifierTableUpdateV4, MixedPSetFullUpdate)
{
_PrefixArray array;
PrefixStringMap map;
nsCString sha256;
CreateRandomSortedPrefixArray(5000, 4, 4, array);
CreateRandomSortedPrefixArray(1000, 5, 32, array);
PrefixArrayToPrefixStringMap(array, map);
CalculateSHA256(array, sha256);
testFullUpdate(map, &sha256);
Clear();
}
TEST(UrlClassifierTableUpdateV4, PartialUpdateWithRemoval)
{
_PrefixArray fArray;
// Apply a full update first.
{
PrefixStringMap fMap;
nsCString sha256;
CreateRandomSortedPrefixArray(10000, 4, 4, fArray);
CreateRandomSortedPrefixArray(2000, 5, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
}
// Apply a partial update with removal.
{
_PrefixArray pArray, mergedArray;
PrefixStringMap pMap, mergedMap;
nsCString sha256;
CreateRandomSortedPrefixArray(5000, 4, 4, pArray);
CreateRandomSortedPrefixArray(1000, 5, 32, pArray);
RemoveIntersection(fArray, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
// Remove 1/5 of elements of original prefix set.
nsTArray<uint32_t> removal;
CreateRandomRemovalIndices(fArray.Length() / 5, fArray.Length(), removal);
RemoveElements(removal, fArray);
// Calculate the expected prefix map.
MergeAndSortArray(fArray, pArray, mergedArray);
PrefixArrayToPrefixStringMap(mergedArray, mergedMap);
CalculateSHA256(mergedArray, sha256);
testPartialUpdate(pMap, &removal, &sha256, mergedMap);
}
Clear();
}
TEST(UrlClassifierTableUpdateV4, PartialUpdateWithoutRemoval)
{
_PrefixArray fArray;
// Apply a full update first.
{
PrefixStringMap fMap;
nsCString sha256;
CreateRandomSortedPrefixArray(10000, 4, 4, fArray);
CreateRandomSortedPrefixArray(2000, 5, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
}
// Apply a partial update without removal
{
_PrefixArray pArray, mergedArray;
PrefixStringMap pMap, mergedMap;
nsCString sha256;
CreateRandomSortedPrefixArray(5000, 4, 4, pArray);
CreateRandomSortedPrefixArray(1000, 5, 32, pArray);
RemoveIntersection(fArray, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
// Calculate the expected prefix map.
MergeAndSortArray(fArray, pArray, mergedArray);
PrefixArrayToPrefixStringMap(mergedArray, mergedMap);
CalculateSHA256(mergedArray, sha256);
testPartialUpdate(pMap, nullptr, &sha256, mergedMap);
}
Clear();
}
// Expect failure because partial update contains prefix already
// in old prefix set.
TEST(UrlClassifierTableUpdateV4, PartialUpdatePrefixAlreadyExist)
{
_PrefixArray fArray;
// Apply a full update fist.
{
PrefixStringMap fMap;
nsCString sha256;
CreateRandomSortedPrefixArray(1000, 4, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
}
// Apply a partial update which contains a prefix in previous full update.
// This should cause an update error.
{
_PrefixArray pArray;
PrefixStringMap pMap;
TableUpdateArray tableUpdates;
// Pick one prefix from full update prefix and add it to partial update.
// This should result a failure when call ApplyUpdates.
pArray.AppendElement(fArray[rand() % fArray.Length()]);
CreateRandomSortedPrefixArray(200, 4, 32, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
GenerateUpdateData(false, pMap, nullptr, nullptr, tableUpdates);
testUpdateFail(tableUpdates);
}
Clear();
}
// Test apply partial update directly without applying an full update first.
TEST(UrlClassifierTableUpdateV4, OnlyPartialUpdate)
{
_PrefixArray pArray;
PrefixStringMap pMap;
nsCString sha256;
CreateRandomSortedPrefixArray(5000, 4, 4, pArray);
CreateRandomSortedPrefixArray(1000, 5, 32, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
CalculateSHA256(pArray, sha256);
testPartialUpdate(pMap, nullptr, &sha256, pMap);
Clear();
}
// Test partial update without any ADD prefixes, only removalIndices.
TEST(UrlClassifierTableUpdateV4, PartialUpdateOnlyRemoval)
{
_PrefixArray fArray;
// Apply a full update first.
{
PrefixStringMap fMap;
nsCString sha256;
CreateRandomSortedPrefixArray(5000, 4, 4, fArray);
CreateRandomSortedPrefixArray(1000, 5, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
}
// Apply a partial update without add prefix, only contain removal indices.
{
_PrefixArray pArray;
PrefixStringMap pMap, mergedMap;
nsCString sha256;
// Remove 1/5 of elements of original prefix set.
nsTArray<uint32_t> removal;
CreateRandomRemovalIndices(fArray.Length() / 5, fArray.Length(), removal);
RemoveElements(removal, fArray);
PrefixArrayToPrefixStringMap(fArray, mergedMap);
CalculateSHA256(fArray, sha256);
testPartialUpdate(pMap, &removal, &sha256, mergedMap);
}
Clear();
}
// Test one tableupdate array contains full update and multiple partial updates.
TEST(UrlClassifierTableUpdateV4, MultipleTableUpdates)
{
_PrefixArray fArray, pArray, mergedArray;
PrefixStringMap fMap, pMap, mergedMap;
nsCString sha256;
TableUpdateArray tableUpdates;
// Generate first full udpate
CreateRandomSortedPrefixArray(10000, 4, 4, fArray);
CreateRandomSortedPrefixArray(2000, 5, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
GenerateUpdateData(true, fMap, nullptr, &sha256, tableUpdates);
// Generate second partial update
CreateRandomSortedPrefixArray(3000, 4, 4, pArray);
CreateRandomSortedPrefixArray(1000, 5, 32, pArray);
RemoveIntersection(fArray, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
MergeAndSortArray(fArray, pArray, mergedArray);
CalculateSHA256(mergedArray, sha256);
GenerateUpdateData(false, pMap, nullptr, &sha256, tableUpdates);
// Generate thrid partial update
fArray.AppendElements(pArray);
fArray.Sort();
pArray.Clear();
CreateRandomSortedPrefixArray(3000, 4, 4, pArray);
CreateRandomSortedPrefixArray(1000, 5, 32, pArray);
RemoveIntersection(fArray, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
// Remove 1/5 of elements of original prefix set.
nsTArray<uint32_t> removal;
CreateRandomRemovalIndices(fArray.Length() / 5, fArray.Length(), removal);
RemoveElements(removal, fArray);
MergeAndSortArray(fArray, pArray, mergedArray);
PrefixArrayToPrefixStringMap(mergedArray, mergedMap);
CalculateSHA256(mergedArray, sha256);
GenerateUpdateData(false, pMap, &removal, &sha256, tableUpdates);
testUpdate(tableUpdates, mergedMap);
Clear();
}
// Test apply full update first, and then apply multiple partial updates
// in one tableupdate array.
TEST(UrlClassifierTableUpdateV4, MultiplePartialUpdateTableUpdates)
{
_PrefixArray fArray;
// Apply a full update first
{
PrefixStringMap fMap;
nsCString sha256;
// Generate first full udpate
CreateRandomSortedPrefixArray(10000, 4, 4, fArray);
CreateRandomSortedPrefixArray(3000, 5, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
}
// Apply multiple partial updates in one table update
{
_PrefixArray pArray, mergedArray;
PrefixStringMap pMap, mergedMap;
nsCString sha256;
nsTArray<uint32_t> removal;
TableUpdateArray tableUpdates;
// Generate first partial update
CreateRandomSortedPrefixArray(3000, 4, 4, pArray);
CreateRandomSortedPrefixArray(1000, 5, 32, pArray);
RemoveIntersection(fArray, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
// Remove 1/5 of elements of original prefix set.
CreateRandomRemovalIndices(fArray.Length() / 5, fArray.Length(), removal);
RemoveElements(removal, fArray);
MergeAndSortArray(fArray, pArray, mergedArray);
CalculateSHA256(mergedArray, sha256);
GenerateUpdateData(false, pMap, &removal, &sha256, tableUpdates);
fArray.AppendElements(pArray);
fArray.Sort();
pArray.Clear();
removal.Clear();
// Generate second partial update.
CreateRandomSortedPrefixArray(2000, 4, 4, pArray);
CreateRandomSortedPrefixArray(1000, 5, 32, pArray);
RemoveIntersection(fArray, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
// Remove 1/5 of elements of original prefix set.
CreateRandomRemovalIndices(fArray.Length() / 5, fArray.Length(), removal);
RemoveElements(removal, fArray);
MergeAndSortArray(fArray, pArray, mergedArray);
PrefixArrayToPrefixStringMap(mergedArray, mergedMap);
CalculateSHA256(mergedArray, sha256);
GenerateUpdateData(false, pMap, &removal, &sha256, tableUpdates);
testUpdate(tableUpdates, mergedMap);
}
Clear();
}
// Test removal indices are larger than the original prefix set.
TEST(UrlClassifierTableUpdateV4, RemovalIndexTooLarge)
{
_PrefixArray fArray;
// Apply a full update first
{
PrefixStringMap fMap;
nsCString sha256;
CreateRandomSortedPrefixArray(1000, 4, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
}
// Apply a partial update with removal indice array larger than
// old prefix set(fArray). This should cause an error.
{
_PrefixArray pArray;
PrefixStringMap pMap;
nsTArray<uint32_t> removal;
TableUpdateArray tableUpdates;
CreateRandomSortedPrefixArray(200, 4, 32, pArray);
RemoveIntersection(fArray, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
for (uint32_t i = 0; i < fArray.Length() + 1; i++) {
removal.AppendElement(i);
}
GenerateUpdateData(false, pMap, &removal, nullptr, tableUpdates);
testUpdateFail(tableUpdates);
}
Clear();
}
TEST(UrlClassifierTableUpdateV4, ChecksumMismatch)
{
// Apply a full update first
{
_PrefixArray fArray;
PrefixStringMap fMap;
nsCString sha256;
CreateRandomSortedPrefixArray(1000, 4, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
}
// Apply a partial update with incorrect sha256
{
_PrefixArray pArray;
PrefixStringMap pMap;
nsCString sha256;
TableUpdateArray tableUpdates;
CreateRandomSortedPrefixArray(200, 4, 32, pArray);
PrefixArrayToPrefixStringMap(pArray, pMap);
// sha256 should be calculated with both old prefix set and add prefix
// set, here we only calculate sha256 with add prefix set to check if
// applyUpdate will return failure.
CalculateSHA256(pArray, sha256);
GenerateUpdateData(false, pMap, nullptr, &sha256, tableUpdates);
testUpdateFail(tableUpdates);
}
Clear();
}
TEST(UrlClassifierTableUpdateV4, ApplyUpdateThenLoad)
{
// Apply update with sha256
{
_PrefixArray fArray;
PrefixStringMap fMap;
nsCString sha256;
CreateRandomSortedPrefixArray(1000, 4, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
CalculateSHA256(fArray, sha256);
testFullUpdate(fMap, &sha256);
// Open lookup cache will load prefix set and verify the sha256
testOpenLookupCache();
}
Clear();
// Apply update without sha256
{
_PrefixArray fArray;
PrefixStringMap fMap;
CreateRandomSortedPrefixArray(1000, 4, 32, fArray);
PrefixArrayToPrefixStringMap(fArray, fMap);
testFullUpdate(fMap, nullptr);
testOpenLookupCache();
}
Clear();
}
// This test is used to avoid an eror from nsICryptoHash
TEST(UrlClassifierTableUpdateV4, ApplyUpdateWithFixedChecksum)
{
_PrefixArray fArray = {_Prefix("enus"),
_Prefix("apollo"),
_Prefix("mars"),
_Prefix("Hecatonchires cyclopes"),
_Prefix("vesta"),
_Prefix("neptunus"),
_Prefix("jupiter"),
_Prefix("diana"),
_Prefix("minerva"),
_Prefix("ceres"),
_Prefix("Aidos,Adephagia,Adikia,Aletheia"),
_Prefix("hecatonchires"),
_Prefix("alcyoneus"),
_Prefix("hades"),
_Prefix("vulcanus"),
_Prefix("juno"),
_Prefix("mercury"),
_Prefix("Stheno, Euryale and Medusa")};
fArray.Sort();
PrefixStringMap fMap;
PrefixArrayToPrefixStringMap(fArray, fMap);
nsCString sha256(
"\xae\x18\x94\xd7\xd0\x83\x5f\xc1"
"\x58\x59\x5c\x2c\x72\xb9\x6e\x5e"
"\xf4\xe8\x0a\x6b\xff\x5e\x6b\x81"
"\x65\x34\x06\x16\x06\x59\xa0\x67");
testFullUpdate(fMap, &sha256);
// Open lookup cache will load prefix set and verify the sha256
testOpenLookupCache();
Clear();
}
// This test ensure that an empty update works correctly. Empty update
// should be skipped by CheckValidUpdate in Classifier::UpdateTableV4.
TEST(UrlClassifierTableUpdateV4, EmptyUpdate)
{
PrefixStringMap emptyAddition;
nsTArray<uint32_t> emptyRemoval;
_PrefixArray array;
PrefixStringMap map;
nsCString sha256;
CalculateSHA256(array, sha256);
// Test apply empty full/partial update before we already
// have data in DB.
testFullUpdate(emptyAddition, &sha256);
testPartialUpdate(emptyAddition, &emptyRemoval, &sha256, map);
// Apply an full update.
CreateRandomSortedPrefixArray(100, 4, 4, array);
CreateRandomSortedPrefixArray(10, 5, 32, array);
PrefixArrayToPrefixStringMap(array, map);
CalculateSHA256(array, sha256);
testFullUpdate(map, &sha256);
// Test apply empty full/partial update when we already
// have data in DB
testPartialUpdate(emptyAddition, &emptyRemoval, &sha256, map);
testFullUpdate(emptyAddition, &sha256);
Clear();
}
// This test ensure applying an empty update directly through update algorithm
// should be correct.
TEST(UrlClassifierTableUpdateV4, EmptyUpdate2)
{
// Setup LookupCache with initial data
_PrefixArray array;
CreateRandomSortedPrefixArray(100, 4, 4, array);
CreateRandomSortedPrefixArray(10, 5, 32, array);
RefPtr<LookupCacheV4> cache = SetupLookupCache<LookupCacheV4>(array);
// Setup TableUpdate object with only sha256 from previous update(initial
// data).
nsCString sha256;
CalculateSHA256(array, sha256);
std::string stdSHA256;
stdSHA256.assign(const_cast<char*>(sha256.BeginReading()), sha256.Length());
RefPtr<TableUpdateV4> tableUpdate = new TableUpdateV4(GTEST_TABLE);
tableUpdate->SetSHA256(stdSHA256);
// Apply update directly through LookupCache interface
PrefixStringMap input, output;
PrefixArrayToPrefixStringMap(array, input);
nsresult rv = cache->ApplyUpdate(tableUpdate.get(), input, output);
ASSERT_TRUE(rv == NS_OK);
Clear();
}