Re: [PATCH v6 12/20] tpm: Add NULL primary creation

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Wed, 2024-01-03 at 17:11 +0200, Jarkko Sakkinen wrote:
> > +       u8 ec_point_x[EC_PT_SZ];
> > +       u8 ec_point_y[EC_PT_SZ];
> 
> And also prefix these similarly with hmac.

This isn't in itself an HMAC; it's the public point of the P-256 key
derived from the null seed (effectively it's a public key).  It's used
to exchange secret information with the TPM, like a salt for the HMAC
sessions but it's a thing in its own right (and is bound to the null
name).  I suppose null_key_x/y is better.

James