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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
Ahh, the SHA-1 implementation is sadly only for the STM32F2 (which isn't in either of the 2 Espruino boards). ST do provide a set of cryptography functions that could probably be used though. Espruino already has SHA256 built in, but it looks like that wouldn't work for WebSockets!
Once that was done, I don't think there would be much of a performance penalty for Websockets on Espruino/ESP8266 though (they're relatively lightweight after the initial setup).