[EXT] Re: [RFC PATCH HBK: 2/8] hw-bound-key: flag-is_hbk added to the tfm

[Varun Sethi]

Hi Herbert,
Please find response inline.

Regards
Varun

> -----Original Message-----
> From: Herbert Xu <herbert at gondor.apana.org.au>
> Sent: Tuesday, September 13, 2022 7:36 AM
> To: Varun Sethi <V.Sethi at nxp.com>
> Cc: Pankaj Gupta <pankaj.gupta at nxp.com>; jarkko at kernel.org;
> a.fatoum at pengutronix.de; Jason at zx2c4.com; jejb at linux.ibm.com;
> zohar at linux.ibm.com; dhowells at redhat.com; sumit.garg at linaro.org;
> david at sigma-star.at; michael at walle.cc; john.ernberg at actia.se;
> jmorris at namei.org; serge at hallyn.com; davem at davemloft.net;
> j.luebbe at pengutronix.de; ebiggers at kernel.org; richard at nod.at;
> keyrings at vger.kernel.org; linux-crypto at vger.kernel.org; linux-
> integrity at vger.kernel.org; linux-kernel at vger.kernel.org; linux-security-
> module at vger.kernel.org; Sahil Malhotra <sahil.malhotra at nxp.com>; Kshitiz
> Varshney <kshitiz.varshney at nxp.com>; Horia Geanta <horia.geanta at nxp.com>
> Subject: Re: [EXT] Re: [RFC PATCH HBK: 2/8] hw-bound-key: flag-is_hbk added
> to the tfm
> 
> Caution: EXT Email
> 
> On Mon, Sep 12, 2022 at 05:19:44PM +0000, Varun Sethi wrote:
> >
> > > On Wed, Sep 07, 2022 at 09:58:45AM +0000, Pankaj Gupta wrote:
> > > >
> > > > There are 3rd party IP(s), which uses kernel for crypto-algorithm's
> operations.
> > > > Modifying the algorithm name in these IP(s), is not always allowed
> > > > or easy to
> > > maintain.
> > >
> > > So the objective is to support out-of-tree modules?
> > [Varun] No, the intention is not to use out of tree modules but to allow
> seamless use of crytpo ciphers with keys backed by security co-processors (keys
> only visible to security co-processors), by Linux kernel and userspace
> components. Hardware backed keys are being introduced as a variant of existing
> Trusted keys, with the difference that these are not un-sealed and released in
> plain to the kernel memory. With the current patchset, the existing set of ciphers
> can be used along with newly introduced hardware backed flag. The security co-
> processor driver is able to interpret the flag and subsequently program the
> hardware, to interpret the supplied key as a hardware backed key.
> 
> Well I asked why isn't the existing arrangement for hardware key algorithms
> sufficient, and I was given the response that you needed this for compatibility
> with third-party IP(s).
> 
> Now are you saying this is not the case? So the existing framework should work
> then?
> 
[Varun] The proposed patchset makes things more scalable. With the hardware backed key flag, there's no need for the security co-processor driver to register separate set of algorithms. This makes things simpler and more scalable for the consumers (OpenSSL, AF_ALG, KTLS etc), as they can continue to use standard set of algorithms and leave the key specific complexity to the driver.

> Cheers,
> --
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