internal: swap backend from prime to p256

oreparaz / p256

ECDSA P-256 signature verification in a single C file targetting embedded use

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internal: swap backend from prime to p256 #19

Closed oreparaz closed 1 year ago

oreparaz commented 1 year ago

BearSSL has code that is specific to P-256. Before, we were using code that worked over any prime field curve. This PR changes the backend to use P-256-specific code. This should be faster (even if speed isn't a goal here).