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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Thanks - I totally agree a firmware implementation seems like the best bet.
That crypto library got posted before - it sure looks good (hopefully it's quite efficient)... I could swap the current SHA implementation over to it as well. I didn't realise AES could work on 16 byte blocks - it definitely makes it much more of an option for low power radio.
However: I'm very conscious that even good encryption that's applied badly can be useless. It'd be interesting to see if there are any good examples of using something like AES in this area (low resources and a pre-shared key).