[webauthn] Pull Request: Make largeBlobs explicit during create.

agl has just submitted a new pull request for https://github.com/w3c/webauthn:

== Make largeBlobs explicit during create. ==
Once largeBlobKey (at CTAP2) became something that the authenticator
could derive I had hoped that we could simplify the WebAuthn level
extension and not have a creation extension. Instead, user agents could
just always create a largeBlobKey in contexts where the extension could
be used.

However 100% (i.e. both) people who have looked at this now though that
was non-obvious and so it's probably Too Cute and should be More
Explicit. Also, it's been suggested that it would be a waste of a
resident credential if the RP needed to store a blob and only found out
after at assertion time that it wouldn't work.

See https://github.com/w3c/webauthn/pull/1470


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Received on Wednesday, 19 August 2020 16:30:40 UTC