crypto: add software implementations for sha256 and ed25519

DotBots / DotBot-firmware

Firmware applications used to control DotBots and SailBots

http://www.dotbots.org

BSD 3-Clause "New" or "Revised" License

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Closed aabadie closed 8 months ago

aabadie commented 8 months ago

This way the crypto libraries can be used with both ntf52833 and nrf5340. When #235 is fixed, nrf5340 can switch to hardware crypto.