[PATCH] tpm: enable HMAC encryption for only x86-64 and aarch64
James Bottomley
James.Bottomley at HansenPartnership.com
Tue May 21 14:13:45 UTC 2024
On Tue, 2024-05-21 at 17:02 +0300, Jarkko Sakkinen wrote:
> Secondly, it also roots to the null key if a parent is not given. So
> it covers all the basic features of the HMAC patch set.
I don't think that can work. The key file would be wrapped to the
parent and the null seed (and hence the wrapping) changes with every
reboot. If you want a permanent key, it has to be in one of the
accessible permanent hierarchies (storage ideally or endorsement).
The spec has a mechanism for deriving the key from a permanent handle
if the system doesn't have it in-place. I do have patches to use that
because that's the way most sealed objects and keys are generated
today. I'll post them (although there'll be a bit of fixing up to do).
Regards,
James
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