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From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Matthew Garrett <mjg59@google.com>
Cc: linux-integrity <linux-integrity@vger.kernel.org>,
	Mimi Zohar <zohar@linux.ibm.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Subject: Re: [PATCH 2/8] lib: add asn.1 encoder
Date: Mon, 09 Dec 2019 14:43:28 -0800	[thread overview]
Message-ID: <1575931408.31378.37.camel@HansenPartnership.com> (raw)
In-Reply-To: <CACdnJuuFoOd-fCCFRWHF6b59YJpA2XPwKw35TH-PWUDUO96vTw@mail.gmail.com>

On Mon, 2019-12-09 at 14:05 -0800, Matthew Garrett wrote:
> On Sat, Dec 7, 2019 at 9:08 PM James Bottomley
> <James.Bottomley@hansenpartnership.com> wrote:
> > 
> > We have a need in the TPM trusted keys to return the ASN.1 form of
> > the TPM key blob so it can be operated on by tools outside of the
> > kernel. To do that, we have to be able to read and write the key
> > format.  The current ASN.1 decoder does fine for reading, but we
> > need pieces of an ASN.1 encoder to return the key blob.
> 
> Is there a reason the kernel needs to do this encoding, rather than
> having something in userland do the translation?

Well, yes, we'd have to define a format to pass up first and then you'd
always need an encoder programme to do it.  Given it's fairly simple to
encode the key format, doing it directly in ASN.1 ... especially as we
already read ASN.1 keys, seems to be the best for the user.

James


  reply	other threads:[~2019-12-09 22:43 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-08  5:06 [PATCH 0/8] Fix TPM 2.0 trusted keys James Bottomley
2019-12-08  5:07 ` [PATCH 1/8] security: keys: trusted: flush the key handle after use James Bottomley
2019-12-09  8:31   ` David Woodhouse
2019-12-09 15:38     ` James Bottomley
2019-12-08  5:08 ` [PATCH 2/8] lib: add asn.1 encoder James Bottomley
2019-12-09  8:50   ` David Woodhouse
2019-12-09 15:46     ` James Bottomley
2019-12-09 22:05   ` Matthew Garrett
2019-12-09 22:43     ` James Bottomley [this message]
2019-12-08  5:09 ` [PATCH 3/8] oid_registry: Add TCG defined OIDS for TPM keys James Bottomley
2019-12-09  8:55   ` David Woodhouse
2019-12-09 16:21     ` James Bottomley
2020-06-19 20:45     ` Wiseman, Monty (GE Research, US)
2020-06-19 22:50       ` Jerry Snitselaar
2020-06-20 15:36       ` James Bottomley
2020-06-23  1:17       ` Jarkko Sakkinen
2019-12-08  5:10 ` [PATCH 4/8] security: keys: trusted: use ASN.1 tpm2 key format for the blobs James Bottomley
2019-12-09 10:04   ` David Woodhouse
2019-12-09 16:31     ` James Bottomley
2019-12-08  5:11 ` [PATCH 5/8] security: keys: trusted: Make sealed key properly interoperable James Bottomley
2019-12-09 10:09   ` David Woodhouse
2019-12-09 17:23     ` James Bottomley
2019-12-08  5:12 ` [PATCH 6/8] security: keys: trusted: add PCR policy to TPM2 keys James Bottomley
2019-12-09 10:18   ` David Woodhouse
2019-12-09 18:03     ` James Bottomley
2019-12-09 18:44       ` David Woodhouse
2019-12-09 19:11         ` James Bottomley
2019-12-25 17:08           ` Ken Goldman
2019-12-08  5:13 ` [PATCH 7/8] security: keys: trusted: add ability to specify arbitrary policy James Bottomley
2019-12-08  5:14 ` [PATCH 8/8] security: keys: trusted: implement counter/timer policy James Bottomley
2019-12-09 20:20 ` [PATCH 0/8] Fix TPM 2.0 trusted keys Jarkko Sakkinen
2019-12-09 20:57   ` James Bottomley

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