Feat: Add 'app' subproject and integrate LSPlt submodule

This commit introduces the main application subproject, 'app', and sets up the necessary infrastructure for the TEESimulator.

Key changes:
*   'app' Subproject Setup: Added the new :app module with its initial structure, including build files, manifest, and Kotlin main entry point.
*   LSPlt Integration: Added the LSPlt hooking framework as a Git submodule in app/src/main/cpp/external/ and configured its use in CMake.
*   Native Build Configuration: Configured the C++ build to use LSPlt statically and compile two essential native libraries: libinject.so (for injection) and libTEESimulator.so (for interception/logic).
*   Module Packaging: Implemented complex Gradle logic within app/build.gradle.kts to automate the creation of a flashable zip module (supporting Magisk, Ksu, and Apatch) with versioning based on Git information.
*   Initial Module Files: Added the template files (module.prop, update-binary, updater-script) for the flashable module structure.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "app/src/main/cpp/external/LSPlt"]
+	path = app/src/main/cpp/external/LSPlt
+	url = https://github.com/JingMatrix/LSPlt

app/build.gradle.kts

@@ -0,0 +1,195 @@
+import com.android.build.api.artifact.SingleArtifact
+import java.io.ByteArrayOutputStream
+import javax.inject.Inject
+import org.gradle.process.ExecOperations
+
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.ktfmt)
+}
+
+ktfmt { kotlinLangStyle() }
+
+// Helper class to get access to the ExecOperations service
+abstract class GitExecutor @Inject constructor(private val execOperations: ExecOperations) {
+    fun execute(command: String, currentWorkingDir: File): String {
+        val byteOut = ByteArrayOutputStream()
+        execOperations.exec {
+            workingDir = currentWorkingDir
+            commandLine = command.split("\\s".toRegex())
+            standardOutput = byteOut
+        }
+        return String(byteOut.toByteArray()).trim()
+    }
+}
+
+// Instantiate the helper class using Gradle's object factory
+val gitExecutor = objects.newInstance(GitExecutor::class.java)
+
+val gitCommitCount = gitExecutor.execute("git rev-list HEAD --count", rootDir).toInt()
+val gitCommitHash = gitExecutor.execute("git rev-parse --verify --short HEAD", rootDir)
+val verName = "v1.0"
+
+android {
+    namespace = "org.matrix.TEESimulator"
+    compileSdk = 36
+    ndkVersion = "27.3.13750724"
+    buildToolsVersion = "36.0.0"
+
+    defaultConfig {
+        applicationId = "org.matrix.TEESimulator"
+        minSdk = 29
+        targetSdk = 36
+        versionCode = gitCommitCount
+        versionName = verName
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            proguardFiles("proguard-rules.pro")
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_21
+        targetCompatibility = JavaVersion.VERSION_21
+    }
+    externalNativeBuild {
+        cmake {
+            path = file("src/main/cpp/CMakeLists.txt")
+            buildStagingDirectory = layout.buildDirectory.get().asFile
+        }
+    }
+}
+
+dependencies {
+    compileOnly(project(":stub"))
+    compileOnly(libs.annotation)
+}
+
+androidComponents {
+    onVariants(selector().all()) { variant ->
+        val capitalized = variant.name.replaceFirstChar { it.uppercase() }
+        val isDebug = variant.buildType == "debug"
+
+        // --- Define output locations and file names ---
+        // Stage all files in a temporary directory inside 'build' before zipping
+        val tempModuleDir = project.layout.buildDirectory.dir("module/${variant.name}")
+        val zipFileName = "TEESimulator-$verName-$gitCommitCount-$gitCommitHash-$capitalized.zip"
+
+        // Task 1: Prepare all module files in the temporary build directory.
+        // Using Sync ensures that stale files from previous runs are removed.
+        val prepareModuleFilesTask =
+            tasks.register<Sync>("prepareModuleFiles${capitalized}") {
+                group = "TEESimulator Module Packaging"
+                description = "Prepares all files for the ${variant.name} module zip."
+
+                if (isDebug) {
+                    dependsOn("package${capitalized}")
+                } else {
+                    dependsOn("minify${capitalized}WithR8")
+                }
+                dependsOn("strip${capitalized}DebugSymbols")
+
+                if (isDebug) {
+                    from(variant.artifacts.get(SingleArtifact.APK)) {
+                        include("*.apk")
+                        rename { "service.apk" }
+                    }
+                } else {
+                    from(
+                        project.layout.buildDirectory.dir(
+                            "intermediates/dex/${variant.name}/minify${capitalized}WithR8"
+                        )
+                    ) {
+                        include("classes.dex")
+                    }
+                }
+
+                from(
+                    project.layout.buildDirectory.dir(
+                        "intermediates/stripped_native_libs/${variant.name}/strip${capitalized}DebugSymbols/out/lib"
+                    )
+                ) {
+                    into("lib") // Place them in the 'lib' subfolder of the staging directory.
+                    include("**/libinject.so", "**/libTEESimulator.so")
+                }
+
+                // Now, copy and process the files from 'module' directory.
+                val sourceModuleDir = rootProject.projectDir.resolve("module")
+                from(sourceModuleDir) {
+                    exclude("module.prop") // Exclude the template file.
+                }
+
+                // Copy and filter the module.prop template separately.
+                from(sourceModuleDir) {
+                    include("module.prop")
+                    // Use expand() for simple key-value replacement.
+                    expand(
+                        "REPLACEMEVERCODE" to gitCommitCount.toString(),
+                        "REPLACEMEVER" to
+                            "$verName ($gitCommitCount-$gitCommitHash-${variant.name})",
+                    )
+                }
+
+                // The destination for all the above 'from' operations.
+                into(tempModuleDir)
+            }
+
+        // Task 2: Zip the prepared files from the temporary directory.
+        val zipTask =
+            tasks.register<Zip>("zip${capitalized}") {
+                group = "TEESimulator Module Packaging"
+                description = "Creates the flashable zip for the ${variant.name} module."
+                dependsOn(prepareModuleFilesTask)
+
+                archiveFileName.set(zipFileName)
+                destinationDirectory.set(project.rootDir.resolve("out"))
+                from(tempModuleDir) // Zip the entire contents of the staging directory.
+            }
+
+        // Task 3: A helper function to create installation tasks for different root providers.
+        fun createInstallTasks(rootProvider: String, installCli: String) {
+            val pushTask =
+                tasks.register<Exec>("push${rootProvider}Module${capitalized}") {
+                    group = "TEESimulator Module Installation"
+                    description =
+                        "Pushes the ${variant.name} module to the device for $rootProvider."
+                    dependsOn(zipTask)
+                    commandLine(
+                        "adb",
+                        "push",
+                        zipTask.get().archiveFile.get().asFile,
+                        "/data/local/tmp",
+                    )
+                }
+
+            val installTask =
+                tasks.register<Exec>("install${rootProvider}${capitalized}") {
+                    group = "TEESimulator Module Installation"
+                    description = "Installs the ${variant.name} module via $rootProvider."
+                    dependsOn(pushTask)
+                    commandLine(
+                        "adb",
+                        "shell",
+                        "su",
+                        "-c",
+                        "$installCli /data/local/tmp/$zipFileName",
+                    )
+                }
+
+            tasks.register<Exec>("install${rootProvider}AndReboot${capitalized}") {
+                group = "TEESimulator Module Installation"
+                description = "Installs the ${variant.name} module via $rootProvider and reboots."
+                dependsOn(installTask)
+                commandLine("adb", "reboot")
+            }
+        }
+
+        createInstallTasks("Magisk", "magisk --install-module")
+        createInstallTasks("Ksu", "ksud module install")
+        createInstallTasks("Apatch", "/data/adb/apd module install")
+    }
+}

app/proguard-rules.pro

@@ -0,0 +1,3 @@
+-keepclasseswithmembers class org.matrix.TEESimulator.MainKt {
+    public static void main(java.lang.String[]);
+}

app/src/main/AndroidManifest.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest />

app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.10)
+project(TEESimulator)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
+
+# LSPlt configuration
+OPTION(LSPLT_BUILD_SHARED OFF)
+add_subdirectory(external/LSPlt/lsplt/src/main/jni)
+
+add_executable(libinject.so inject/main.cpp)
+target_link_libraries(libinject.so PRIVATE lsplt_static)
+
+add_library(${CMAKE_PROJECT_NAME} SHARED binder_interceptor.cpp)
+target_link_libraries(${CMAKE_PROJECT_NAME} PRIVATE lsplt_static)
+

app/src/main/cpp/binder_interceptor.cpp

@@ -0,0 +1,6 @@
+#include "lsplt.hpp"
+
+extern "C" [[gnu::visibility("default")]] [[gnu::used]]
+bool entry(void *library_handle) {
+  return true;
+}

app/src/main/cpp/inject/main.cpp

@@ -0,0 +1,3 @@
+#include "lsplt.hpp"
+
+int main(int argc, char **argv) { return 0; }

app/src/main/java/org/matrix/TEESimulator/Main.kt

@@ -0,0 +1,3 @@
+package org.matrix.TEESimulator
+
+fun main(args: Array<String>) {}

build.gradle.kts

@@ -11,6 +11,7 @@ tasks.register<KtfmtFormatTask>("format") {
     source = project.fileTree(rootDir)
     include("*.gradle.kts", "*/*.gradle.kts")
     dependsOn(":stub:ktfmtFormat")
+    dependsOn(":app:ktfmtFormat")
 }
 
 ktfmt { kotlinLangStyle() }

module/META-INF/com/google/android/update-binary

@@ -0,0 +1,33 @@
+#!/sbin/sh
+
+#################
+# Initialization
+#################
+
+umask 022
+
+# echo before loading util_functions
+ui_print() { echo "$1"; }
+
+require_new_magisk() {
+  ui_print "*******************************"
+  ui_print " Please install Magisk v20.4+! "
+  ui_print "*******************************"
+  exit 1
+}
+
+#########################
+# Load util_functions.sh
+#########################
+
+OUTFD=$2
+ZIPFILE=$3
+
+mount /data 2>/dev/null
+
+[ -f /data/adb/magisk/util_functions.sh ] || require_new_magisk
+. /data/adb/magisk/util_functions.sh
+[ $MAGISK_VER_CODE -lt 20400 ] && require_new_magisk
+
+install_module
+exit 0

module/META-INF/com/google/android/updater-script

@@ -0,0 +1 @@
+#MAGISK

module/module.prop

@@ -0,0 +1,7 @@
+id=tricky_store
+name=TEESimulator
+version=${REPLACEMEVER}
+versionCode=${REPLACEMEVERCODE}
+author=JingMatrix
+description=Software simulation for Android hardware-backed key pairs with key attestation
+updateJson=https://raw.githubusercontent.com/JingMatrix/TEESimulator/main/module/update.json

settings.gradle.kts

@@ -17,3 +17,5 @@ dependencyResolutionManagement {
 rootProject.name = "TEESimulator"
 
 include(":stub")
+
+include(":app")