I can't speak to the testsuite code, but:
> - what does it mean exactly to load a key ?
Keys created by the TPM are returned to the user as a "key blob", which
contains the public key, the encrypted private key, and some information about
the key. In order for the key to be used, it must be loaded: the user provides
the blob to the TPM, and the TPM decrypts the private key and holds it in its
internal memory for use.
In the TSS, loading a key can sometimes be used simply to get a TSS-level key
handle, when the key (such as the SRK) is already stored within the TPM.
(I'm glossing over some of the finer details; does that answer your question,
or do you need more?)
> - my Pcr are all set to null (0) at the moment, are there not supposed to be
> set to a particular value at the boot ? How
> can we know which Pcr correspond to what ?Because I thought that the TPM was
> setting all values of the PCR at the boot > and that each corresponds to the
> "image" of a particular application... (I'm working with an emulator)
The *TPM* does not ever set PCR values. PCR values are set from the outside,
using the TPM's TPM_Extend command. The boot values you're thinking of are put
in by the Root of Trust for Measurement, usually the BIOS, and by other
higher-level programs. (For example, the tGRUB boot loader hashes the kernel
and kernel options being loaded and extends the results into various PCRs.)
The TCG's PC Client documentation has the low-level PCR correspondences (I'm
looking at the PC Client Implementation for BIOS document); higher-level PCR
associations can (usually) be found in the documentation of your TPM-aware
software.
Ariel Segall
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