AES Encrypt/Decrypt iOS Prototype

I need a simple proof of concept that will encrypt string values from a RealBasic (similar to VB) app and decrypt in iOS app. This must use AES to do this. For the RealBasic sample app, we will use MonkeyBread plugins to do this which has support for AES. I will provide everything needed for the RealBasic application including plugins for testing. Need most of the work on the XCode app.