diff --git a/build.gradle.kts b/build.gradle.kts
index 22e4a07..69f3271 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,6 +1,8 @@
 import com.android.build.gradle.AppExtension
 import com.android.build.gradle.LibraryExtension
+import org.jetbrains.kotlin.daemon.common.toHexString
 import java.io.ByteArrayOutputStream
+import java.security.MessageDigest
 
 plugins {
     alias(libs.plugins.agp.app) apply false
@@ -24,11 +26,25 @@ val gitCommitHash = "git rev-parse --verify --short HEAD".execute()
 // also the soname
 val moduleId by extra("tricky_store")
 val moduleName by extra("Tricky Store")
+val author by extra("5ec1cff")
+val description by extra("A trick of keystore")
 val verName by extra("v1.0.3")
 val verCode by extra(gitCommitCount)
 val commitHash by extra(gitCommitHash)
 val abiList by extra(listOf("arm64-v8a", "x86_64"))
 
+fun calculateChecksum(): String {
+    return MessageDigest.getInstance("SHA-256").run {
+        update(moduleId.toByteArray(Charsets.UTF_8))
+        update(moduleName.toByteArray(Charsets.UTF_8))
+        update(verName.toByteArray(Charsets.UTF_8))
+        update(verCode.toString().toByteArray(Charsets.UTF_8))
+        update(author.toByteArray(Charsets.UTF_8))
+        update(description.toByteArray(Charsets.UTF_8))
+        digest().toHexString()
+    }
+}
+
 val androidMinSdkVersion by extra(31)
 val androidTargetSdkVersion by extra(34)
 val androidCompileSdkVersion by extra(34)
diff --git a/module/build.gradle.kts b/module/build.gradle.kts
index 4e77b02..500fca0 100644
--- a/module/build.gradle.kts
+++ b/module/build.gradle.kts
@@ -15,6 +15,9 @@ val verName: String by rootProject.extra
 val commitHash: String by rootProject.extra
 val abiList: List<String> by rootProject.extra
 val androidMinSdkVersion: Int by rootProject.extra
+val author: String by rootProject.extra
+val description: String by rootProject.extra
+val moduleDescription = description
 
 android {
     defaultConfig {
@@ -91,7 +94,9 @@ androidComponents.onVariants { variant ->
                     "moduleId" to moduleId,
                     "moduleName" to moduleName,
                     "versionName" to "$verName ($verCode-$commitHash-$variantLowered)",
-                    "versionCode" to verCode
+                    "versionCode" to verCode,
+                    "author" to author,
+                    "description" to moduleDescription,
                 )
             }
             from(layout.projectDirectory.file("template")) {
diff --git a/module/template/module.prop b/module/template/module.prop
index 7fe0ac9..acd5150 100644
--- a/module/template/module.prop
+++ b/module/template/module.prop
@@ -2,6 +2,6 @@ id=${moduleId}
 name=${moduleName}
 version=${versionName}
 versionCode=${versionCode}
-author=5ec1cff
-description=A trick of keystore
+author=${author}
+description=${description}
 #updateJson=
diff --git a/service/build.gradle.kts b/service/build.gradle.kts
index 01d3db1..c4667f7 100644
--- a/service/build.gradle.kts
+++ b/service/build.gradle.kts
@@ -1,10 +1,33 @@
 import android.databinding.tool.ext.capitalizeUS
+import org.jetbrains.kotlin.daemon.common.toHexString
+import java.security.MessageDigest
 
 plugins {
     alias(libs.plugins.jetbrains.kotlin.android)
     alias(libs.plugins.agp.app)
 }
 
+val moduleId: String by rootProject.extra
+val moduleName: String by rootProject.extra
+val verCode: Int by rootProject.extra
+val verName: String by rootProject.extra
+val commitHash: String by rootProject.extra
+val author: String by rootProject.extra
+val description: String by rootProject.extra
+val moduleDescription = description
+
+fun calculateChecksum(variantLowered: String): String {
+    return MessageDigest.getInstance("SHA-256").run {
+        update(moduleId.toByteArray(Charsets.UTF_8))
+        update(moduleName.toByteArray(Charsets.UTF_8))
+        update("$verName ($verCode-$commitHash-$variantLowered)".toByteArray(Charsets.UTF_8))
+        update(verCode.toString().toByteArray(Charsets.UTF_8))
+        update(author.toByteArray(Charsets.UTF_8))
+        update(description.toByteArray(Charsets.UTF_8))
+        digest().toHexString()
+    }
+}
+
 android {
     namespace = "io.github.a13e300.tricky_store"
     compileSdk = 34
@@ -22,6 +45,10 @@ android {
                 "proguard-rules.pro"
             )
         }
+        forEach {
+            val checksum = calculateChecksum(it.name)
+            it.buildConfigField("String", "CHECKSUM", "\"$checksum\"")
+        }
     }
 
     kotlinOptions {
@@ -44,6 +71,11 @@ android {
         checkReleaseBuilds = false
         abortOnError = true
     }
+
+    buildFeatures {
+        buildConfig = true
+    }
+
 }
 
 dependencies {
diff --git a/service/src/main/java/io/github/a13e300/tricky_store/Main.kt b/service/src/main/java/io/github/a13e300/tricky_store/Main.kt
index 15033d3..27eff8c 100644
--- a/service/src/main/java/io/github/a13e300/tricky_store/Main.kt
+++ b/service/src/main/java/io/github/a13e300/tricky_store/Main.kt
@@ -1,6 +1,11 @@
 package io.github.a13e300.tricky_store
 
+import java.io.File
+import java.security.MessageDigest
+import kotlin.system.exitProcess
+
 fun main(args: Array<String>) {
+    verifySelf()
     Logger.i("Welcome to TrickyStore!")
     while (true) {
         if (!KeystoreInterceptor.tryRunKeystoreInterceptor()) {
@@ -13,3 +18,42 @@ fun main(args: Array<String>) {
         }
     }
 }
+
+@OptIn(ExperimentalStdlibApi::class)
+fun verifySelf() {
+    val kv = mutableMapOf<String, String>()
+    val prop = File("./module.prop")
+    runCatching {
+        if (prop.canonicalPath != "/data/adb/modules/tricky_store/module.prop") error("wrong directory ${prop.canonicalPath}!")
+        prop.forEachLine(Charsets.UTF_8) {
+            val a = it.split("=", limit = 2)
+            if (a.size != 2) return@forEachLine
+            kv[a[0]] = a[1]
+        }
+        val checksum = MessageDigest.getInstance("SHA-256").run {
+            update(kv["id"]!!.toByteArray(Charsets.UTF_8))
+            update(kv["name"]!!.toByteArray(Charsets.UTF_8))
+            update(kv["version"]!!.toByteArray(Charsets.UTF_8))
+            update(kv["versionCode"]!!.toByteArray(Charsets.UTF_8))
+            update(kv["author"]!!.toByteArray(Charsets.UTF_8))
+            update(kv["description"]!!.toByteArray(Charsets.UTF_8))
+            digest().toHexString()
+        }
+        if (checksum != BuildConfig.CHECKSUM) {
+            Logger.e("unverified module files! ($checksum != ${BuildConfig.CHECKSUM})")
+            prop.writeText(kv.entries.joinToString("\n") { (k, v) ->
+                when (k) {
+                    "description" -> "description=×Module files corrupted, please re-download it from github.com/5ec1cff/TrickyStore"
+                    "author" -> "author=5ec1cff"
+                    else -> "$k=$v"
+                }
+            })
+            File("./remove").createNewFile()
+            exitProcess(1)
+        }
+        Logger.d("verify success!")
+    }.onFailure {
+        Logger.e("error while verifying self", it)
+        exitProcess(1)
+    }
+}