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Commit f3a46c17 authored by Chris Ye's avatar Chris Ye Committed by Automerger Merge Worker
Browse files

Obsfucate the input device uniq id. am: 657c2f0b 

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/14724090

Change-Id: I3a7db323076815f170c2b6fa55908632a322e466
parents fcf65c14 657c2f0b

services/inputflinger/reader/EventHub.cpp

+15 −1
Original line number Diff line number Diff line
@@ -67,6 +67,8 @@ static const char* DEVICE_PATH = "/dev/input"; 
// v4l2 devices go directly into /dev

static const char* VIDEO_DEVICE_PATH = "/dev";



static constexpr size_t OBFUSCATED_LENGTH = 8;



static constexpr int32_t FF_STRONG_MAGNITUDE_CHANNEL_IDX = 0;

static constexpr int32_t FF_WEAK_MAGNITUDE_CHANNEL_IDX = 1;
@@ -1828,9 +1830,21 @@ void EventHub::unregisterVideoDeviceFromEpollLocked(const TouchVideoDevice& vide 


void EventHub::reportDeviceAddedForStatisticsLocked(const InputDeviceIdentifier& identifier,

                                                    Flags<InputDeviceClass> classes) {

    SHA256_CTX ctx;

    SHA256_Init(&ctx);

    SHA256_Update(&ctx, reinterpret_cast<const uint8_t*>(identifier.uniqueId.c_str()),

                  identifier.uniqueId.size());

    std::array<uint8_t, SHA256_DIGEST_LENGTH> digest;

    SHA256_Final(digest.data(), &ctx);



    std::string obfuscatedId;

    for (size_t i = 0; i < OBFUSCATED_LENGTH; i++) {

        obfuscatedId += StringPrintf("%02x", digest[i]);

    }



    android::util::stats_write(android::util::INPUTDEVICE_REGISTERED, identifier.name.c_str(),

                               identifier.vendor, identifier.product, identifier.version,

                               identifier.bus, identifier.uniqueId.c_str(), classes.get());

                               identifier.bus, obfuscatedId.c_str(), classes.get());

}



void EventHub::openDeviceLocked(const std::string& devicePath) {