Re: Help recalculating TPMv2 PCR8 value without actually booting

[Randy Goldenberg]

Maybe helpful; I have no idea:

https://dev.to/machinehunter/reading-pcr-value-from-uefi-4a82

On Thu, May 23, 2024 at 3:06 PM David Elie-Dit-Cosaque <deliedit@redhat.com>
wrote:

> Hi,
> I am trying to recalculate the value of TPM PCR 8 the way grub does it
> during boot but I could not figure it out yet.
> Grub seems to calculate a digest for every line of the grub.conf that is
> rendered after executing every control structure such as if statement for
> loops, etc...
> Is there a way to generate such a rendered command list without actually
> booting? The tpm2_eventlog lists all these commands as events measured for
> PCR 8 after the fact.
>
> Was there any previous discussion to add a grub command to calculate the
> value of PCR8 (and others) without actually rebooting?
>
> Thanks!
> David.
>