NFCCTAP_GETRESPONSE doesn't supported

[ken666lin]

The NFCCTAP_GETRESPONSE doesn't in android project, but supported in yubikit iOS project.

The standard in ctap2:

The NFCCTAP_MSG command send a CTAP message to the authenticator. This command SHALL return as soon as processing is done. If the operation was not completed, it MAY return a 0x9100 result to trigger NFCCTAP_GETRESPONSE functionality if the client indicated support by setting the relevant bit in P1.
p1:0x80

Thanks!

[AdamVe]

Hi, you are right. Our implementation currently uses P1=0x00 for NFCCTAP_MSG which indicates that the GET RESPONSE functionality is not supported. Could you share more details about what issues, if any, you're experiencing with the current implementation?

[ken666lin]

Just for some situation that can not response real time such as authenticator long time processing or nfc reader short timeout. If support NFCCTAP_GETRESPONSE will be more robust.
Thanks!

[AdamVe]

Thanks for suggesting this enhancement for robustness. I've looked into this and the NFCCTAP_GETRESPONSE feature is currently only used by YubiKey 5Ci over Lightning connections (no other YubiKeys implement it), which is why you'll find the implementation in the iOS SDK but not in yubikit-android. Are you perhaps working with a different authenticator device that requires this functionality?

[ken666lin]

Got it.
Thanks!

[AdamVe]

Hi @ken666lin, we added support for NFCCTAP_GETRESPONSE (and more) in yubikit-android 2.9.0.