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

[Pankaj Gupta <pankaj.gupta@nxp.com>]

> -----Original Message-----
> From: Herbert Xu <herbert@gondor.apana.org.au>
> Sent: Tuesday, September 6, 2022 12:13 PM
> To: Pankaj Gupta <pankaj.gupta@nxp.com>
> Cc: jarkko@kernel.org; a.fatoum@pengutronix.de; Jason@zx2c4.com;
> jejb@linux.ibm.com; zohar@linux.ibm.com; dhowells@redhat.com;
> sumit.garg@linaro.org; david@sigma-star.at; michael@walle.cc;
> john.ernberg@actia.se; jmorris@namei.org; serge@hallyn.com;
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> <sahil.malhotra@nxp.com>; Kshitiz Varshney <kshitiz.varshney@nxp.com>;
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> Subject: [EXT] Re: [RFC PATCH HBK: 2/8] hw-bound-key: flag-is_hbk added to
> the tfm
> 
> Caution: EXT Email
> 
> On Tue, Sep 06, 2022 at 12:21:51PM +0530, Pankaj Gupta wrote:
> > Consumer of the kernel crypto api, after allocating the
> > transformation, sets this flag based on the basis of the type of key
> > consumer has. This helps:
> >
> > - This helps to influence the core processing logic
> >   for the encapsulated algorithm.
> > - This flag is set by the consumer after allocating
> >   the tfm and before calling the function crypto_xxx_setkey().
> >
> > Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
> > ---
> >  include/linux/crypto.h | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/include/linux/crypto.h b/include/linux/crypto.h index
> > 2324ab6f1846..b4fa83ca87bd 100644
> > --- a/include/linux/crypto.h
> > +++ b/include/linux/crypto.h
> > @@ -639,6 +639,8 @@ struct crypto_tfm {
> >
> >       u32 crt_flags;
> >
> > +     unsigned int is_hbk;
> > +
> 
> We already have plenty of drivers with hardware keys in the tree.
> Plesae explain why the current support is inadequate and you need to do
> this.
> 
Current support, does not permit the hardware to support both types of keys: HBK & Plain Key, at the same time.

This change is generic and permit any driver that supports both- HBK and plain-key, to differentiate and use the keys accordingly.

> Thanks,
> --
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