DexProtector (https://dexprotector.com) is one of the pioneers in mobile application and library shielding. It protects and obfuscates Android and iOS applications and libraries. Our solution helps you to secure your code and assets against unauthorized or illegal use, tampering, reverse engineering, and cracking.

This sample is to demonstrate how Dynamic APK Protection mechanism works.

Description

https://dexprotector.com/docs#dynamic-apk-protection

Requirements

• Android Studio or Gradle
• NDK
• DexProtector Enterpise with a valid license

Configuring

• Set path to Android SDK in local.properties
• Set path to DexProtector Enterprise in build.gradle (project’s root) instead of /Users/developer/DexProtector

Building

Building 2nd apk

cd DynamicApkProtection/DynamicSample
<ndk-dir>/ndk-build
../gradlew clean assembleRelease
cp build/outputs/apk/DynamicSample-release.apk ../Main/src/main/assets/DynamicSample.apk

Building Main apk

cd DynamicApkProtection/Main
<ndk-dir>/ndk-build
../gradlew clean assembleRelease

Evaluating

adb install -r build/outputs/apk/Main-release.apk
adb shell am start -n com.dexprotector.dynamic.main/.MainActivity

When the Main application is started the following protection features are demonstrated:

• Loading of a native library from the Main application which is protected with Native Library Encryption (NLE) + JNI Obfuscation (JNI)
• Loading of a file from the assets of the Main application which is protected with Resource Encryption
• Loading of a protected apk from the Main application’s assets
• Loading of a native library (NLE+JNI) from the second apk
• Call of an ordinary and a JNI method (Hide Access + JNI) from the 2nd apk
• Call of a JNI method from the Main app
• Loading of a file from the assets folder of the 2nd apk protected with Resource Encryption

Corresponding messages will be displayed on a screen.