Re: [Trustedjava-support] Recompute PRC based on SML and TPM_Quote problem

[Martin P. <Mar...@ia...>]

Krzysztof Kostienko wrote:
> Hello everyone,

Hi...

>  First I am not sure how the
> PRCExtend is implemented.

For single PCR extension see TPM Emulator implementation,
tpm_integrity.c, function TPM_Extend.


> Unfortunately I do not know
> how in TPM_Quote operation the value of PCRs is calculated(if we choose
> e.g.
> PCR[0], PCR[1] and PCR[2] their values are somehow connected and then hash
> value calculated).

For PCR composite calculation see TPM Emulator implementation,
tpm_integrity.c, function tpm_compute_pcr_digest.



However, C may not be nice for/to everyone, see attached 2 scripts
which replicate the calculation and some examples in Ruby.
Try them and play with JTpmTools to understand it.


HTH

-- 
Martin Pirker
IAIK, TU Graz