The current project aims to show data input limits for AES-GCM encryption on Android < 10 (API 29).

For testing so you need:

Success scenario:

1. Launch the app
2. Click "Encode" button
3. Click "Decode" button
4. It will work properly

Limitation scenario:

1. Open MainActivity
2. Comment line 43 and uncomment line 42
3. Launch the app
4. Click "Encode" button
5. Click "Decode" button
6. Check the logs. You will see javax.crypto.AEADBadTagException

Emulator settings: For testing I used Pixel 6 API 28 device with default params

The record with results: demo video

The screenshot with error: