Re: [PATCH v10 2/8] oid_registry: Add TCG defined OIDS for TPM keys

[Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>]

On Thu, Jun 18, 2020 at 12:22:02PM -0700, James Bottomley wrote:
> On Thu, 2020-06-18 at 10:14 +0300, Jarkko Sakkinen wrote:
> > On Wed, Jun 17, 2020 at 05:25:40PM -0700, James Bottomley wrote:
> > > On Wed, 2020-06-17 at 14:42 -0700, Jerry Snitselaar wrote:
> > > > On Tue Jun 16 20, James Bottomley wrote:
> > > > > The TCG has defined an OID prefix "2.23.133.10.1" for the
> > > > > various
> > > > > TPM
> > > > > key uses.  We've defined three of the available numbers:
> > > > > 
> > > > > 2.23.133.10.1.3 TPM Loadable key.  This is an asymmetric key
> > > > > (Usually
> > > > > 		RSA2048 or Elliptic Curve) which can be
> > > > > imported by a
> > > > > 		TPM2_Load() operation.
> > > > > 
> > > > > 2.23.133.10.1.4 TPM Importable Key.  This is an asymmetric key
> > > > > (Usually
> > > > > 		RSA2048 or Elliptic Curve) which can be
> > > > > imported by a
> > > > > 		TPM2_Import() operation.
> > > > > 
> > > > > Both loadable and importable keys are specific to a given TPM,
> > > > > the
> > > > > difference is that a loadable key is wrapped with the symmetric
> > > > > secret, so must have been created by the TPM itself.  An
> > > > > importable
> > > > > key is wrapped with a DH shared secret, and may be created
> > > > > without
> > > > > access to the TPM provided you know the public part of the
> > > > > parent
> > > > > key.
> > > > > 
> > > > > 2.23.133.10.1.5 TPM Sealed Data.  This is a set of data (up to
> > > > > 128
> > > > > 		bytes) which is sealed by the TPM.  It usually
> > > > > 		represents a symmetric key and must be unsealed
> > > > > before
> > > > > 		use.
> > > > > 
> > > > 
> > > > James, which document are these defined in? I was searching last
> > > > night, and couldn't find it.
> > > 
> > > It isn't.  It's defined in a TCG spreadsheet that Monty Wiseman
> > > keeps, but that seems to be as "official" as it gets with the TCG
> > > OID registry.
> > > 
> > > James
> > 
> > "The TCG has defined an OID prefix "2.23.133.10.1" for the various
> > TPM key uses."
> > 
> > Should this sentence start just as "TCG ...", not sure if "the" is
> > required?
> 
> I've always referred to it as The Trusted Computing Group (so the TCG)
> partly to show they're not just any old trusted computing group.  But I
> think they mostly do refer to themselves in literature as TCG.

... not that this highly important, just asking for pure interest :-)

/Jarkko