On 3/8/2017 4:58 AM, Roberto Sassu wrote:
>
> Regarding modifying the digest before it is passed to the extend
> function, can truncating/padding with zeros be considered
> a standard? If not, verifiers have to look at the software
> implementation, in order to find how the digest was modified.
> I add in CC tpmdd-devel@lists.sourceforge.net also here.

It's not a TCG standard, just a way of making sure the unused PCR bank 
doesn't remain at zero, permitting forged measurements.

As for the verifier, I ignore the bank I'm not interested in.  I don't 
verify the truncated/padded bank.





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