[Trustedjava-support] How to compute Hash over PCRs without TPM

[Account I. <mud...@ho...>]

Hi,
I have the same problem as listed in the following attached post by Till 
Bentz. The answer to this question refers to another post with
Subject: "Re: Recompute PRC based on SML and TPM_Quote problem" and 
Message-ID: <469...@ia...> posted on Date: Mon, 16 Jul 2007 
09:28:06 +0200. But this message is blank.

I could not find any code in tests which could compute the hash over the 
quoted PCRs WITHOUT USING TPM (i.e. TcIPcrComposite object). I guess that I 
should do something as follows:

TcTpmPcrInfoShort pcrInfo = new TcTpmPcrInfoShort(); // short because PCR 16 
intended

TcTpmPcrSelection pcrSelection = new TcTpmPcrSelection();
// 1. how to say that PCR 16 should be selected ???????

TcTpmPcrValue pcrValue = new TcTpmPcrValue();
// 2. how to put some value at PCR 16 ??????

pcrInfo.setPcrSelection(pcrSelection); // if done in step 1
// 3. How to associate PCR value with pcrinfo ?????

pcrInfo.getDigestAtRelease().getDigest();// It will give the required digest 
having set the expected value in PCR 16

Regards

Mudassar.


----------------------------------------------------------------------------------------------

Hello,

I try to do a tpm_quote. I managed to set the relevant pPCRs, the validation
information and actually execute the
quote call.

My problem is now that i somehow want to check the quote. How can I do that
on a PC without a TPM. As far as I understood the quote process computes a
hash over the quoted PCRs and stores it in TcTpmQuoteInfo.getDigestValue()

I have the values of each quoted PCR, but how do I manually recompute that
value so I can check the quote?

Thanks.
-- 
MfG
  Till

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