java: Implement keystore clearing for target packages during initialization

- Currently using keystore2 API.
- TODO: Add support for keystore1.

Signed-off-by: Dakkshesh <beakthoven@gmail.com>

app/src/main/java/io/github/beakthoven/TrickyStoreOSS/Main.kt

@@ -36,9 +36,24 @@ private fun initializeInterceptors() {
     }
     
     PkgConfig.initialize()
+    clearKeyStore()
     Logger.i("Interceptors initialized successfully")
 }
 
+private fun clearKeyStore() {
+    val targetUIDs = PkgConfig.getTargetPackageUids()
+    Logger.i("Clearing keystore for ${targetUIDs.size} target packages")
+
+    targetUIDs.forEach { uid ->
+        kotlin.runCatching {
+            android.security.AndroidKeyStoreMaintenance.clearNamespace(0, uid.toLong())
+            Logger.d("Cleared keystore namespace for UID: $uid")
+        }.onFailure {
+            Logger.e("Failed to clear keystore for UID: $uid", it)
+        }
+    }
+}
+
 private fun selectKeystoreInterceptor() = when {
     Build.VERSION.SDK_INT in Build.VERSION_CODES.Q..Build.VERSION_CODES.R -> {
         Logger.i("Using KeystoreInterceptor for Android Q/R (SDK ${Build.VERSION.SDK_INT})")

app/src/main/java/io/github/beakthoven/TrickyStoreOSS/config/Config.kt

@@ -9,6 +9,7 @@ import android.content.pm.IPackageManager
 import android.os.FileObserver
 import android.os.IBinder
 import android.os.IInterface
+import android.os.Process
 import android.os.ServiceManager
 import io.github.beakthoven.TrickyStoreOSS.AttestUtils.TEEStatus
 import io.github.beakthoven.TrickyStoreOSS.KeyBoxUtils
@@ -174,6 +175,33 @@ object PkgConfig {
         return false
     }.onFailure { Logger.e("failed to get packages", it) }.getOrNull() ?: false
 
+    private fun getTargetPackages(): Set<String> {
+        return (hackPackages + generatePackages + packageModes.keys).toSet()
+    }
+
+    fun getTargetPackageUids(): Set<Int> {
+        val result = mutableSetOf<Int>()
+        val pm = getPm() ?: return emptySet()
+        val flags = if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.TIRAMISU) 0L else 0
+        val userId = Process.myUid() / 100000
+
+        getTargetPackages().forEach { pkg ->
+            kotlin.runCatching {
+                val appInfo = pm.getApplicationInfo(pkg, flags, userId)
+                if (appInfo != null) {
+                    result.add(appInfo.uid)
+                    Logger.d("Got UID ${appInfo.uid} for package: $pkg")
+                } else {
+                    Logger.e("ApplicationInfo is null for package: $pkg")
+                }
+            }.onFailure {
+                Logger.e("Failed to get UID for package: $pkg", it)
+            }
+        }
+
+        return result
+    }
+
     @Volatile
     var _customPatchLevel: CustomPatchLevel? = null
 

stub/src/main/java/android/content/pm/IPackageManager.java

@@ -10,6 +10,10 @@ import android.os.IBinder;
 public interface IPackageManager {
     String[] getPackagesForUid(int uid);
 
+    ApplicationInfo getApplicationInfo(String packageName, int flags, int userId);
+
+    ApplicationInfo getApplicationInfo(String packageName, long flags, int userId);
+
     PackageInfo getPackageInfo(String packageName, long flags, int userId);
 
     PackageInfo getPackageInfo(String packageName, int flags, int userId);

stub/src/main/java/android/security/AndroidKeyStoreMaintenance.java

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2025 Dakkshesh <beakthoven@gmail.com>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package android.security;
+
+public class AndroidKeyStoreMaintenance {
+
+    public static int clearNamespace(int domain, long namespace) {
+        throw new RuntimeException("");
+    }
+}