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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
I'm afraid that is just part of ST's library for the STM32F2 (it's not the chip that Espruino has) - it doesn't itself contain an MD5 implementation, it just uses some hardware on the chip.
Coming up with a JS module is probably preferable (unless you can find a very small C implementation) - IMO less than 1% of Espruino's users would use it, so it's debatable whether its worth using up precious flash for.