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Re: [webauthn] Is there a way to store metadata in the authenticator with/without an extension? (#1613)

From: Adam Langley via GitHub <sysbot+gh@w3.org>
Date: Thu, 20 May 2021 20:49:56 +0000
To: public-webauthn@w3.org
Message-ID: <issue_comment.created-845467354-1621543794-sysbot+gh@w3.org>
You can put data in the user.id, which will be persisted by CTAP2 authenticators. (Although you shouldn't put anything sensitive in there.)

The "small blob" extension is credBlob: https://fidoalliance.org/specs/fido-v2.1-rd-20210309/fido-client-to-authenticator-protocol-v2.1-rd-20210309.html#sctn-credBlob-extension

It's supported in Chrome (although probably hasn't reached stable yet), but needs CTAP 2.1 authenticators.

largeBlob is also supported in Chrome behind a flag, but authenticators are likewise rare.

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