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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.
@Mike
Take a look at:
http://bitwiseshiftleft.github.io/sjcl/
AES is a well tested standard, and has low resource requirements. I can't speak for the safety of that particular library, but they certainly have some good credentials. I think it would be possible to trim down that library to fit on an Espruino, especially since you already have some components implemented (SHA-256).