Thanks for the link - I didn't know that existed. Looks quite interesting, especially as it uses the hardware where available. There's actually SHA256 support already, so you can at the very least sign messages with a secret key in order to check they're correct.
Back to the UI... I just added this: https://github.com/gfwilliams/SVGUI
Very basic and dodgy at the moment, but you get the idea. The code will need to be a bit more complex to handle things like endstops and different kinds of widget, but hopefully we could get some interesting functionality into quite a small footprint.
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