Tutorial How to decrypt an encrypted .dll [NO-ROOT]

[G-Bo ッ]

Intro
The binaries given is home made, dont expect any good thing in it. I'll explain it on 2nd post. Might not work on some games.
Prerequisities

• Basic-Intermediate knowledge about android modding,
• Apktool,
• Injection lib.

libs.tar.gz

Steps
1. Decompile apk. (self explaination)
2a. (Optional, but recommended) add

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

before </manifest> at AndroidManifest.xml
2b. Find mainactivity,
---
Open AndroidManifest.xml, look for <action android:name="android.intent.action.MAIN"/>

<activity android:configChanges="locale|fontScale|keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|touchscreen|uiMode" android:label="@string/app_name" android:launchMode="singleTop" android:name="net.circleous.domtweaks.StartActivity" android:screenOrientation="landscape">
  <intent-filter>
    <action android:name="android.intent.action.MAIN"/>
    <category android:name="android.intent.category.LAUNCHER"/>
  </intent-filter>
</activity>

if you read that carefully and see on top of it(<action android:name="android.intent.action.MAIN"/>) ->
android.name="net.circleous.domtweaks.StartActivity"
You have to open StartActivity.smali file at smali/net/circleous/domtweaks/
---
3. Now add at onCreate or .method constructor <init>

    const-string v0, "monoDump"
     invoke-static {v0}, Ljava/lang/System;->loadLibrary(Ljava/lang/String;)V

4. Extract libs.tar.gz and put armeabi, armeabi-v7a, and x86 folder to lib/ folder.
File tree,

libs
├── armeabi
│   ├── ....
│   ├── libTKHooklib.so
│   └── libmonoDump.so
├── armeabi-v7a
│   ├── ....
│   ├── libTKHooklib.so
│   └── libmonoDump.so
└── x86
    ├── ....
    └── libmonoDump.so

5. Re-build and sign apk.
6. Install and run the game.
7. Dumps is located at /sdcard/<packagename>-<dll>


Credits: Wobm

 

[dragon13294]

hello you, that it?

 

[G-Bo ッ]

hello you, that it?
View attachment 171

yeah looks correct

 

[mimilu]

How can I encrypt dll file after mod and run it normally

 

[G-Bo ッ]

How can I encrypt dll file after mod and run it normally

you cannot remove a mod code from a dll

 

[mimilu]

I mean how to encrypt the dll (and also .so file) for code protection

I cannot find any tutorials talking about this

 

[mimilu]

may you teach me how to do that?

 

[G-Bo ッ]

may you teach me how to do that?

You question goes to security break of modders work, sorry but I will not help on that

 

[nik2143]

I tried it on Rolling Sky but it doesn't work the game is stuck on a white screen

 

[G-Bo ッ]

I tried it on Rolling Sky but it doesn't work the game is stuck on a white screen
View attachment 20606

its not working for all games, checkout the dump tutos with gdb