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WebAuthn: Large blob storage extension (largeBlob)

Category

Miscellaneous

Type

Chromium catches up

Status

Enabled by default (Chrome 113)

Intent stage

Prepare to ship

Summary

Adds support for the WebAuthn largeBlob [1] client authenticator extension. This extension allows relying parties to store opaque data associated to a credential. [1] https://w3c.github.io/webauthn/#sctn-large-blob-extension

Motivation

Storing information such as certificates associated to a WebAuthn credential.

Standards & signals

• Specification: https://www.w3.org/TR/webauthn-3/#sctn-large-blob-extension
• Firefox: No signal
• Safari: Support
• Web developers: Positive — I had a few developers reach out about availability, e.g. crbug.com/1282491.
• Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1114875

Samples: https://webauthn-large-blob.glitch.me

Explainers: https://w3c.github.io/webauthn/#sctn-large-blob-extension

View on chromestatus.com