linux-credentials / linux-credentials/libwebauthn

Consider splitting PXP into a separate crate

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Dominant language
Rust
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Description

PXP (formerly "hybrid", formerly "caBLE") now is being used as a transport protocol for multiple application protocols, including CTAP2 hybrid and the digital credentials API. We might want to split the transport-level handling into a separate crate that is consumed by libwebauthn, and perhaps a future Digital Credentials library.

The PXP specification has been broken out from CTAP 2.3, and an initial working draft has been published at https://fidoalliance.org/specs/hybrid/proximity-exchange-protocol-v1.0-wd-20260717.html.

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Research direction

Start by reading the linked PXP working draft and locating the current PXP transport handling in libwebauthn. Determine which transport-level pieces could form a separate crate and how libwebauthn would consume them. Done means the crate boundary and migration scope are agreed, with the existing CTAP2 hybrid behavior preserved.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
backend-api-design
Issue type
Refactor
Difficulty
5/5
Estimated time
Over a week
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
35/100

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