Add prf extension input output types (PRF#2) #34
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This PR follows on #33. It adds new types for authenticator extensions as part of our PRF implementation. Specifically, it implements a type for CTAP2's hmac-secret and adds signed/unsigned extension outputs. The unsigned extension output contains a prf field that is used when the authenticator and client are in memory or are communicating over an internal channel.
Note: The
--all-featureswas removed from the tests due to needingBytesto serialize to a byte array.