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: Tue, 02 Oct 2018 17:38:57 +0100
Message-ID: <fe6f8a061afb6508d309d08b86ae0cc87fc90b25.camel@infradead.org>
In-Reply-To: 9F48E1A823B03B4790B7E6E69430724D0142675F83@EXCH2010B.sit.fraunhofer.de
List-ID: <tpm2@lists.01.org>
To: tpm2@lists.01.org

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On Tue, 2018-10-02 at 16:20 +0000, Fuchs, Andreas wrote:
> Hi David,
> =

> unfortuantely, the engines are diferent as much as their license and unde=
rlying TSSes.
> tpm2-tss (which is TCG spec conformant) and IBM's proprietary OpenSource =
TSS.
> =

> The tpm2-tss-engine is newer and BSD-license, whilst James's is (L?)GPL.
> Thus, we could not just take his and add a second underlying TSS but had =
to
> implement a completely new one to get rid of the license terms.
> So we had to come up with our own storage format.
> I also cannot look at James's codebase to not become tainted with GPL cop=
yleft.
> =

> That's why we chose a different engine name and made sure to label PEM di=
fferently,
> so we don't get compatibility messes.
> =

> If you'd like to propose a different storage format for tpm2-tss-engine, =
please
> provide me with a format. Maybe we can fit it into the first 0.1 release.
> (but that would have to happen VERY quickly, i.e. the next 2 weeks).

Ultimately, our aim should be for people to be able to use the same PEM
file regardless of which software stack they're using. I'll be fixing
up GnuTLS client code to use the same files, much as I did for TPMv1
PEM files a while ago.

https://mta.openssl.org/pipermail/openssl-dev/2016-December/008936.html
 covers the format that James implemented.

I think we also need to agree on which key is used as the parent by
default. I'm guessing that's the reason I couldn't get my manual PEM
file conversion to work in Github issue #11.

I believe openssl_tpm2_engine generates a P-256 primary key and uses
that as the parent. =



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