On Sat, Nov 09, 2024 at 08:48:22AM +0000, Orie Steele wrote:
> AKP seems fine to me, for example:
>
> const jwk = {
> kty: "AKP",
> kid: "01",
> alg: "X-Wing",
> pub: "4iNrNajCSz...tmrrIzQSQQO9lNA", // both public keys
> priv: "f5wrpOiP...rPpm7yY", // single seed
> key_ops: ["deriveBits"],
> };
This does not work, because with KEMs (e.g., X-Wing) one always gets at
least two algorithms, which is something AKP can not deal with.
E.g., if one natively adds X-Wing, one gets one algorithm for X-Wing
as Direct Key Agreement and at least one algorithm for X-Wing combined
with key wrapping as Key Agreement with Key Wrapping.
Or if adding X-Wing via HPKE, there are multiple possible AEADs, and
each becomes an algorithm.
-Ilari
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