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SHA-224/256/384/512 will work for the signature :). Now, it depends on whether AES128 or 256 can work which I guess will depend on memory consumption. I was able to implement encryption on a LPC1768 mcu which only has 32KB RAM, 512KB FLASH. The Espruino board has RAM 48 kBytes, Flash 256 kBytes
The Pico has 384kb flash, 96kb RAM. So, perhaps the Pico will be better suited for encryption?
d0773d
This is available in Espruino https://github.com/espruino/Espruino/tree/master/libs/hashlib
Reference: http://www.espruino.com/Reference#HASH
I thought you had to compile custom hardware but this line makes me wonder @Gordon..?
EDIT: a bit too quick to the keyboard there... This is SHA not AES, silly me.
For adding a new library, see this tutorial :)