Handle prf on authenticator (PRF#4) #36
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Progdrasil
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handle-prf-input-output-for-client
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This PR follows on #35. It implements PRF handling for the authenticator in
passkey-authenticatorfollowing hmac-secret from the CTAP2 specification. Because both authenticator and client live in memory, we pass the hmac-secret outputs in the unsigned extension outputs map instead of encrypting them and sending them as part of the "extensions" parameter.