What exactly is listed in algorithms?

[KramNamez]

I was recently trying to figure out what algorithms various fido key models would support, and noticed that fido2-token -I would sometimes list something under "algorithms" and sometimes not.

Do I just need to find the manual for each model, or is there a way to figure out if a model f.ex. supports ed25519 for use with SSH?

[LDVG]

Hi,

The "algorithms" field was added to CTAP 2.1 as an optional field to the authenticatorGetInfo response structure. If the field is present, fido2-token -I will show it.

If the field is omitted, the only way to find out if an algorithm is supported is by trying to generate a credential.

[KramNamez]

Okay, so basically all my keys are being silly about this and either don't use the field or only show a weird excerpt of the actual list.

Thanks for the quick answer!