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

From: Adam Langley via GitHub <sysbot+gh@w3.org>
Date: Wed, 30 Sep 2020 19:59:14 +0000
To: public-webauthn@w3.org
Message-ID: <pull_request.closed-470282766-1601495953-sysbot+gh@w3.org>
agl has just merged agl's pull request 1470 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.

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<a href="https://pr-preview.s3.amazonaws.com/agl/webauthn/pull/1470.html" title="Last updated on Sep 28, 2020, 9:01 PM UTC (5a7f641)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/webauthn/1470/faa8de8...agl:5a7f641.html" title="Last updated on Sep 28, 2020, 9:01 PM UTC (5a7f641)">Diff</a>

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

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