Here is an Arduino Example

[SoothingMist]

Found Sergey's code easy to use and follow. Really appreciate multi-length messages beyond 16 bytes.

For my project to transition https://github.com/SoothingMist/Scalable-Point-to-Point-LoRa-Sensor-Network to RAKwireless equipment, I wanted to look into message encrypt/decrypt. The Arduino IDE is used to program this equipment. Attached you will find a basic use of Sergey's code as an example for Arduino/RAKwireless implementation. (Since exceptions are disabled in this case, I did replace that with Serial.println and exit in AES.cpp.)
AES-New.ino.txt