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Ya, I thought about that. Maybe make an Ecryption breakout board designated only for crypto. For example: https://www.sparkfun.com/products/12773 The CryptoCape is for the beagle bone black. The Cape is rather large and I would most likely need a smaller breakout board. I've been thinking about a crypto project for a while now, but I haven't had the time to sit down and research the subject in depth. For all I know, there already might be a crypto project out there like the cryptocape.
You could offload the hashing to an external µCU maybe? Then talk to it via serial/i2c/whatever.