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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.
@Stevie
While I initially also proposed Blowfish, I now think that maybe due to limited resources XXTEA is a better choice.
As a test, I implemented a C library which can be used to encrypt / decrypt strings using XXTEA. The code consumes roughly 1500 bytes. A test with encoding 10000 strings of 1000 bytes each took about 20 seconds, leading to about 500 KB per second encoding speed - decoding should be the same. That sounds pretty nice for me.