Re: [webauthn] What does "the extension was acted upon" mean for the AppID extension?

(I continue to believe that `appid` should not have a return value.)

Chrome's behaviour is that the appid return value exactly mirrors the input value. (I.e. case (1).) The motivation here is that option (2) is moot: the RP knows whether the credential was registered with U2F and so, if such a credential worked via webauthn, then clearly the extension was respected.

Also, Chrome behaviour is that appid is _always_ returned (even if appid wasn't a specified extension) because the return value element isn't optional. We're probably going to change that to just unilaterally make it optional in Chrome ([bug](https://bugs.chromium.org/p/chromium/issues/detail?id=853770)).

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Received on Tuesday, 3 July 2018 12:18:10 UTC