From mboxrd@z Thu Jan  1 00:00:00 1970
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From: David Woodhouse <dwmw2 at infradead.org>
Subject: Re: [tpm2] Conflicting TPM2 engines and storage formats
Date: Thu, 11 Oct 2018 11:31:36 -0700
Message-ID: <290fb06eeb478137f5bd83616e3b2045d353bb24.camel@infradead.org>
In-Reply-To: 1539281833.3108.6.camel@HansenPartnership.com
List-ID: <tpm2@lists.01.org>
To: tpm2@lists.01.org

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On Thu, 2018-10-11 at 11:17 -0700, James Bottomley wrote:
> > > > thanks for the summary. I agree with all of them. Some more
> > > > things to agree on:
> > > > =

> > > > Primarykeys.publicArea:
> > > > -  .type =3D TPM2_ALG_ECC,
> > > >   .nameAlg =3D TPM2_ALG_SHA256
> > > > - .objectAttributes =3D (TPMA_OBJECT_USERWITHAUTH |
> > > > TPMA_OBJECT_RESTRICTED | TPMA_OBJECT_DECRYPT |
> > > > TPMA_OBJECT_FIXEDTPM |
> > > > TPMA_OBJECT_FIXEDPARENT | TPMA_OBJECT_SENSITIVEDATAORIGIN)
> > > =

> > > Actually, this is way too little.  In fact we don't care about the
> > > asymmetric key at all because it's the derived symmetric key that's
> > > used to encrypt the private blob (so you're missing its
> > > parameters). Unfortunately the type and all the asymmetric
> > > parameters (including a lot you haven't show here) are part of the
> > > name which is input to KDFa for the symmetric key.  Let's just
> > > follow all the provisioning guidance because it does outline them
> > > in a table, so just say "The ECC Template from the EK and TPM
> > > provisioning guides".
> > =

> > That seems to make sense. Other than the objectAttributes, what else
> > have we done *differently* to the template in the provisioning
> > guides?
> =

> Nothing, everything else seems to match including the symmetric
> parameters, the curve and the unique point.  The annoying thing is the
> name as input to KDFa. It's the sha256 sum of the entire public area,
> so every single parameter has to match to get the KDFa to spit back the
> same symmetric key.

The provisioning guide says to set TPMA_OBJECT_NODA, doesn't it?

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