From: Jarkko Sakkinen <jarkko@kernel.org>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: "Horia Geantă" <horia.geanta@nxp.com>,
"Aymen Sghaier" <aymen.sghaier@nxp.com>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
kernel@pengutronix.de, "David Gstir" <david@sigma-star.at>,
"Pankaj Gupta" <pankaj.gupta@nxp.com>,
"Tim Harvey" <tharvey@gateworks.com>,
"Matthias Schiffer" <matthias.schiffer@ew.tq-group.com>,
"James Bottomley" <jejb@linux.ibm.com>,
"Mimi Zohar" <zohar@linux.ibm.com>,
"David Howells" <dhowells@redhat.com>,
"James Morris" <jmorris@namei.org>,
"Eric Biggers" <ebiggers@kernel.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
"Jan Luebbe" <j.luebbe@pengutronix.de>,
"Richard Weinberger" <richard@nod.at>,
"Franck LENORMAND" <franck.lenormand@nxp.com>,
"Sumit Garg" <sumit.garg@linaro.org>,
linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org
Subject: Re: [PATCH v5 4/5] crypto: caam - add in-kernel interface for blob generator
Date: Wed, 23 Feb 2022 16:41:12 +0100 [thread overview]
Message-ID: <YhZVmBy3/nWbqf+/@iki.fi> (raw)
In-Reply-To: <20220222195819.2313913-5-a.fatoum@pengutronix.de>
On Tue, Feb 22, 2022 at 08:58:18PM +0100, Ahmad Fatoum wrote:
> The NXP Cryptographic Acceleration and Assurance Module (CAAM)
> can be used to protect user-defined data across system reboot:
>
> - When the system is fused and boots into secure state, the master
> key is a unique never-disclosed device-specific key
> - random key is encrypted by key derived from master key
> - data is encrypted using the random key
> - encrypted data and its encrypted random key are stored alongside
> - This blob can now be safely stored in non-volatile memory
>
> On next power-on:
> - blob is loaded into CAAM
> - CAAM writes decrypted data either into memory or key register
>
> Add functions to realize encrypting and decrypting into memory alongside
> the CAAM driver.
>
> They will be used in a later commit as a source for the trusted key
> seal/unseal mechanism.
>
> Reviewed-by: David Gstir <david@sigma-star.at>
> Reviewed-by: Pankaj Gupta <pankaj.gupta@nxp.com>
> Tested-By: Tim Harvey <tharvey@gateworks.com>
> Tested-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
> Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> To: "Horia Geantă" <horia.geanta@nxp.com>
> To: Aymen Sghaier <aymen.sghaier@nxp.com>
> To: Herbert Xu <herbert@gondor.apana.org.au>
> To: "David S. Miller" <davem@davemloft.net>
> Cc: James Bottomley <jejb@linux.ibm.com>
> Cc: Jarkko Sakkinen <jarkko@kernel.org>
> Cc: Mimi Zohar <zohar@linux.ibm.com>
> Cc: David Howells <dhowells@redhat.com>
> Cc: James Morris <jmorris@namei.org>
> Cc: Eric Biggers <ebiggers@kernel.org>
> Cc: "Serge E. Hallyn" <serge@hallyn.com>
> Cc: Jan Luebbe <j.luebbe@pengutronix.de>
> Cc: David Gstir <david@sigma-star.at>
> Cc: Richard Weinberger <richard@nod.at>
> Cc: Franck LENORMAND <franck.lenormand@nxp.com>
> Cc: Sumit Garg <sumit.garg@linaro.org>
> Cc: Tim Harvey <tharvey@gateworks.com>
> Cc: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
> Cc: Pankaj Gupta <pankaj.gupta@nxp.com>
> Cc: linux-integrity@vger.kernel.org
> Cc: keyrings@vger.kernel.org
> Cc: linux-crypto@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-security-module@vger.kernel.org
> ---
> drivers/crypto/caam/Kconfig | 3 +
> drivers/crypto/caam/Makefile | 1 +
> drivers/crypto/caam/blob_gen.c | 230 +++++++++++++++++++++++++++++++++
> include/soc/fsl/caam-blob.h | 56 ++++++++
> 4 files changed, 290 insertions(+)
> create mode 100644 drivers/crypto/caam/blob_gen.c
> create mode 100644 include/soc/fsl/caam-blob.h
>
> diff --git a/drivers/crypto/caam/Kconfig b/drivers/crypto/caam/Kconfig
> index 84ea7cba5ee5..ea9f8b1ae981 100644
> --- a/drivers/crypto/caam/Kconfig
> +++ b/drivers/crypto/caam/Kconfig
> @@ -151,6 +151,9 @@ config CRYPTO_DEV_FSL_CAAM_RNG_API
> Selecting this will register the SEC4 hardware rng to
> the hw_random API for supplying the kernel entropy pool.
>
> +config CRYPTO_DEV_FSL_CAAM_BLOB_GEN
> + bool
> +
> endif # CRYPTO_DEV_FSL_CAAM_JR
>
> endif # CRYPTO_DEV_FSL_CAAM
> diff --git a/drivers/crypto/caam/Makefile b/drivers/crypto/caam/Makefile
> index 3570286eb9ce..25f7ae5a4642 100644
> --- a/drivers/crypto/caam/Makefile
> +++ b/drivers/crypto/caam/Makefile
> @@ -21,6 +21,7 @@ caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI) += caamalg_qi.o
> caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_AHASH_API) += caamhash.o
> caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_API) += caamrng.o
> caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PKC_API) += caampkc.o pkc_desc.o
> +caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_BLOB_GEN) += blob_gen.o
>
> caam-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI) += qi.o
> ifneq ($(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI),)
> diff --git a/drivers/crypto/caam/blob_gen.c b/drivers/crypto/caam/blob_gen.c
> new file mode 100644
> index 000000000000..513d3f90e438
> --- /dev/null
> +++ b/drivers/crypto/caam/blob_gen.c
> @@ -0,0 +1,230 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>
> + * Copyright (C) 2021 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de>
> + */
> +
> +#include <linux/device.h>
> +#include <soc/fsl/caam-blob.h>
> +
> +#include "compat.h"
> +#include "desc_constr.h"
> +#include "desc.h"
> +#include "error.h"
> +#include "intern.h"
> +#include "jr.h"
> +#include "regs.h"
> +
> +struct caam_blob_priv {
> + struct device jrdev;
> +};
> +
> +struct caam_blob_job_result {
> + int err;
> + struct completion completion;
> +};
> +
> +static void caam_blob_job_done(struct device *dev, u32 *desc, u32 err, void *context)
> +{
> + struct caam_blob_job_result *res = context;
> + int ecode = 0;
> +
> + dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
> +
> + if (err)
> + ecode = caam_jr_strstatus(dev, err);
> +
> + res->err = ecode;
> +
> + /*
> + * Upon completion, desc points to a buffer containing a CAAM job
> + * descriptor which encapsulates data into an externally-storable
> + * blob.
> + */
> + complete(&res->completion);
> +}
> +
> +static u32 *caam_blob_alloc_desc(size_t keymod_len)
> +{
> + size_t len;
> +
> + /* header + (key mod immediate) + 2x pointers + op */
> + len = 4 + (4 + ALIGN(keymod_len, 4)) + 2*(4 + 4 + CAAM_PTR_SZ_MAX) + 4;
Nit: the amount of magic numbers is overwhelming here. I neither understand
the statement nor how that comment should help me to understand it.
BR, Jarkko
next prev parent reply other threads:[~2022-02-23 15:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-22 19:58 [PATCH v5 0/5] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys Ahmad Fatoum
2022-02-22 19:58 ` [PATCH v5 1/5] KEYS: trusted: allow use of TEE as backend without TCG_TPM support Ahmad Fatoum
2022-02-22 19:58 ` [PATCH v5 2/5] KEYS: trusted: allow users to use kernel RNG for key material Ahmad Fatoum
2022-02-23 15:42 ` Jarkko Sakkinen
2022-02-22 19:58 ` [PATCH v5 3/5] KEYS: trusted: allow trust sources " Ahmad Fatoum
2022-02-23 16:23 ` Ahmad Fatoum
2022-02-25 11:57 ` [EXT] " Pankaj Gupta
2022-03-02 4:43 ` Pankaj Gupta
2022-02-22 19:58 ` [PATCH v5 4/5] crypto: caam - add in-kernel interface for blob generator Ahmad Fatoum
2022-02-23 15:41 ` Jarkko Sakkinen [this message]
2022-02-23 16:20 ` Ahmad Fatoum
2022-02-25 12:20 ` [EXT] " Pankaj Gupta
2022-03-14 15:33 ` Ahmad Fatoum
2022-02-28 12:14 ` Jarkko Sakkinen
2022-03-16 16:44 ` Ahmad Fatoum
2022-02-22 19:58 ` [PATCH v5 5/5] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys Ahmad Fatoum
2022-02-25 12:43 ` [EXT] " Pankaj Gupta
2022-03-02 4:37 ` Pankaj Gupta
2022-03-07 4:48 ` Pankaj Gupta
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