Hi list,
Like a few before me, I'm trying to calculate in software the value of
PCR17 after SENTER. I'm taking the value of the first extend as a given
(from SinitMleData.SinitHash) and am trying to reconstruct the value at the
end of the second extend.
I took Jonathan McCune's Perl script as a starting point and was able to
reproduce his result (which I'm assuming is for SinitMleData.Version 6,
given his computation of the first PCR17 extend in his Perl script) using a
Python script I wrote. I then modified my script to use the value from
SinitMleData.SinitHash directly, since my understanding is that it contains
the value of PCR17 after the first extend for SinitMleData.Version 8).
So my computation is now identical to the one in the MLE Developer's Guide.
SHA-1 ( SinitMleData.SinitHash | SHA-1 ( SinitMleData.BiosAcm.ID |
SinitMleData.MsegValid | SinitMleData.StmHash | SinitMleData.PolicyControl
|
SinitMleData.LcpPolicyHash | (OsSinitData.Capabilities, 0) |
SinitMleData.ProcessorSCRTMStatus) )
Unfortunately, I'm not able to get to the value for PCR 17 that tboot
dumps, before it performs its own extend to PCR17.
If anyone has successfully computed PCR 17 or has thoughts on what I might
be doing wrong, I'd appreciate your input.
Thanks,
Sahil
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