Although encrypting algorithms exist in Java, you cannot conceal them by Proguard due to java imports.
This repository provides a method for hiding your algorithms: C++ encoding. Therefore, you should not worry about the exposure of your algorithms. It uses Crypto++ 5.6.2 to fulfil the hidden algorithm requirements.
git clone git@github.com:BruceWind/CryptoPPInNDK.git
cd CryptoPPInNDK && git lfs pull
sh ./build_and_push.sh
adb shell
>$: cd /data/local/
>$: ./main
// looking for logs.
Before running this shell, you must connect an android emulator in advance.
The repo was written so early that it could go wrong in case of building with a new version of NDK. You may need to build with NDK 13/14/16.
Be careful with git clone, I've used git lfs to store *.a files.