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SubjectRE: [EXT] [PATCH v8 3/6] KEYS: trusted: Introduce NXP DCP-backed trusted keys
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Hi Ahmad,

> -----Original Message-----
> From: Ahmad Fatoum <a.fatoum@pengutronix.de>
> Sent: Tuesday, April 9, 2024 10:58 PM
> To: Kshitiz Varshney <kshitiz.varshney@nxp.com>; David Gstir
> <david@sigma-star.at>; Mimi Zohar <zohar@linux.ibm.com>; James
> Bottomley <jejb@linux.ibm.com>; Jarkko Sakkinen <jarkko@kernel.org>;
> Herbert Xu <herbert@gondor.apana.org.au>; David S. Miller
> <davem@davemloft.net>
> Cc: linux-doc@vger.kernel.org; Gaurav Jain <gaurav.jain@nxp.com>; Catalin
> Marinas <catalin.marinas@arm.com>; David Howells
> <dhowells@redhat.com>; keyrings@vger.kernel.org; Fabio Estevam
> <festevam@gmail.com>; Paul Moore <paul@paul-moore.com>; Jonathan
> Corbet <corbet@lwn.net>; Richard Weinberger <richard@nod.at>; Rafael J.
> Wysocki <rafael.j.wysocki@intel.com>; James Morris <jmorris@namei.org>;
> dl-linux-imx <linux-imx@nxp.com>; Serge E. Hallyn <serge@hallyn.com>;
> Paul E. McKenney <paulmck@kernel.org>; Sascha Hauer
> <s.hauer@pengutronix.de>; Pankaj Gupta <pankaj.gupta@nxp.com>; sigma
> star Kernel Team <upstream+dcp@sigma-star.at>; Steven Rostedt (Google)
> <rostedt@goodmis.org>; David Oberhollenzer <david.oberhollenzer@sigma-
> star.at>; linux-arm-kernel@lists.infradead.org; linuxppc-dev@lists.ozlabsorg;
> Randy Dunlap <rdunlap@infradead.org>; linux-kernel@vger.kernel.org; Li
> Yang <leoyang.li@nxp.com>; linux-security-module@vger.kernel.org; linux-
> crypto@vger.kernel.org; Pengutronix Kernel Team <kernel@pengutronix.de>;
> Tejun Heo <tj@kernel.org>; linux-integrity@vger.kernel.org; Shawn Guo
> <shawnguo@kernel.org>; Varun Sethi <V.Sethi@nxp.com>
> Subject: Re: [EXT] [PATCH v8 3/6] KEYS: trusted: Introduce NXP DCP-backed
> trusted keys
>
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>
> Hello Kshitiz,
>
> On 09.04.24 12:54, Kshitiz Varshney wrote:
> > Hi David,
> >> + b->fmt_version = DCP_BLOB_VERSION;
> >> + get_random_bytes(b->nonce, AES_KEYSIZE_128);
> >> + get_random_bytes(b->blob_key, AES_KEYSIZE_128);
> >
> > We can use HWRNG instead of using kernel RNG. Please refer
> > drivers/char/hw_random/imx-rngc.c
>
> imx-rngc can be enabled and used to seed the kernel entropy pool. Adding
> direct calls into imx-rngc here only introduces duplicated code at no extra
> benefit.
>
> Cheers,
> Ahmad
>
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Understood.

Regards,
Kshitiz

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