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This is mostly due to its variable length, which makes it hard to store in fixed size stack-allocated structures, and also that we didn't need it for our PoC.
However, it might be desirable in the future to receive this data (such as extension outputs) and parse it in the relying party.
We currently do not support the
extensions
andattestedCredentialData
in the authenticator data structure, as specified in WebAuthn § 6.1 Authenticator Data and CTAP 2.1 § 6.2.2 authenticatorGetAssertion Algorithm.This is mostly due to its variable length, which makes it hard to store in fixed size stack-allocated structures, and also that we didn't need it for our PoC.
However, it might be desirable in the future to receive this data (such as extension outputs) and parse it in the relying party.
Implementation Note
The struct is defined here:
libmicrofido2/include/assertion.h
Lines 69 to 74 in bb3678d
The processing may happen here:
libmicrofido2/src/assertion.c
Lines 479 to 489 in bb3678d
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