RE: [tpmdd-devel] [PATCH 2/2] keys, trusted: seal with a policy

From: Fuchs, Andreas
Date: Thu Nov 19 2015 - 06:08:08 EST

> ________________________________________
> From: Jarkko Sakkinen [jarkko.sakkinen@xxxxxxxxxxxxxxx]
> Sent: Tuesday, November 17, 2015 17:27
> Support for sealing with a authorization policy.
> Two new options for trusted keys:
> * 'policydigest=': provide an auth policy digest for sealing.
> * 'policyhandle=': provide a policy session handle for unsealing.

Hi Jarkko,

just out of curiosity; when testing this, how did you calculate the blobauth parameter ?
Since its calculation requires the cpHash for the unseal()-command...
If you "predict" the cpHash in userSpace, this would mean that userspace needs to know the
kernels way of constructing the unseal()-command to the TPM, which in turn would make
this part of the ABI and require documentation before upstreaming, imho.

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