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From: Herbert Xu <herbert@gondor.apana.org.au>
To: "Stephan Müller" <smueller@chronox.de>
Cc: linux-crypto@vger.kernel.org,
	Marcelo Cerri <marcelo.cerri@canonical.com>,
	Tianjia Zhang <tianjia.zhang@linux.alibaba.com>,
	ard.biesheuvel@linaro.org, nhorman@redhat.com, simo@redhat.com
Subject: Re: [PATCH v3 0/5] DH: SP800-56A rev 3 compliant validation checks
Date: Fri, 31 Jul 2020 23:29:25 +1000	[thread overview]
Message-ID: <20200731132925.GA14360@gondor.apana.org.au> (raw)
In-Reply-To: <2544426.mvXUDI8C0e@positron.chronox.de>

On Mon, Jul 20, 2020 at 07:05:45PM +0200, Stephan Müller wrote:
> Hi,
> 
> This patch set adds the required checks to make all aspects of
> (EC)DH compliant with SP800-56A rev 3 assuming that all keys
> are ephemeral. The use of static keys adds yet additional
> validations which are hard to achieve in the kernel.
> 
> SP800-56A rev 3 mandates various checks:
> 
> - validation of remote public key defined in section 5.6.2.2.2
>   is already implemented in:
> 
>   * ECC: crypto_ecdh_shared_secret with the call of
>     ecc_is_pubkey_valid_partial
> 
>   * FFC: dh_compute_val when the req->src is read and validated with
>     dh_is_pubkey_valid
> 
> - validation of generated shared secret: The patch set adds the
>   shared secret validation as defined by SP800-56A rev 3. For
>   ECDH this only implies that the validation of the shared secret
>   is moved before the shared secret is returned to the caller.
> 
>   For DH, the validation is required to be performed against the prime
>   of the domain parameter set.
> 
>   This patch adds the MPI library file mpi_sub_ui that is required
>   to calculate P - 1 for the DH check. It would be possible, though
>   to simply set the LSB of the prime to 0 to obtain P - 1 (since
>   P is odd per definition) which implies that mpi_sub_ui would not
>   be needed. However, this would require a copy operation from
>   the existing prime MPI value into a temporary MPI where the
>   modification can be performed. Such copy operation is not available.
>   Therefore, the solution with the addition of mpi_sub_ui was chosen.
> 
>   NOTE: The function mpi_sub_ui is also added with the patch set
>   "[PATCH v5 2/8] lib/mpi: Extend the MPI library" currently sent
>   to the linux-crypto mailing list.
> 
> - validation of the generated local public key: Patches 4 and 5 of
>   this patch set adds the required checks.
> 
> Changes to v2:
> 
> - add reference to GnuMP providing the basis for patch 2 and updating
>   the copyright note in patch 2
> 
> Changes to v1:
> 
> - fix reference to Gnu MP as outlined by Ard Biesheuvel
> - addition of patches 4 and 5
> 
> Marcelo Henrique Cerri (1):
>   lib/mpi: Add mpi_sub_ui()
> 
> Stephan Mueller (4):
>   crypto: ECDH - check validity of Z before export
>   crypto: DH - check validity of Z before export
>   crypto: DH SP800-56A rev 3 local public key validation
>   crypto: ECDH SP800-56A rev 3 local public key validation
> 
>  crypto/dh.c          | 38 +++++++++++++++++++++
>  crypto/ecc.c         | 42 +++++++++++++++++++++---
>  crypto/ecc.h         | 14 ++++++++
>  include/linux/mpi.h  |  3 ++
>  lib/mpi/Makefile     |  1 +
>  lib/mpi/mpi-sub-ui.c | 78 ++++++++++++++++++++++++++++++++++++++++++++
>  6 files changed, 172 insertions(+), 4 deletions(-)
>  create mode 100644 lib/mpi/mpi-sub-ui.c

All applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

      parent reply	other threads:[~2020-07-31 13:30 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-10 10:09 [PATCH 0/3] DH: SP800-56A rev 3 compliant shared secret Stephan Müller
2020-07-10 10:10 ` [PATCH 1/3] crypto: ECDH - check validity of Z before export Stephan Müller
2020-07-10 10:10 ` [PATCH 2/3] lib/mpi: Add mpi_sub_ui() Stephan Müller
2020-07-10 14:42   ` Ard Biesheuvel
2020-07-10 15:10     ` Stephan Mueller
2020-07-10 10:15 ` [PATCH 3/3] crypto: DH - check validity of Z before export Stephan Müller
2020-07-12 16:38 ` [PATCH v2 0/5] DH: SP800-56A rev 3 compliant validation checks Stephan Müller
2020-07-12 16:39   ` [PATCH v2 1/5] crypto: ECDH - check validity of Z before export Stephan Müller
2020-07-12 18:02     ` Vitaly Chikunov
2020-07-15 13:17     ` Marcelo Henrique Cerri
2020-07-12 16:39   ` [PATCH v2 2/5] lib/mpi: Add mpi_sub_ui() Stephan Müller
2020-07-16  7:30     ` Herbert Xu
2020-07-16  8:41       ` Ard Biesheuvel
2020-07-16 12:50         ` Marcelo Henrique Cerri
2020-07-16 13:09           ` Ard Biesheuvel
2020-07-16 13:41             ` Marcelo Henrique Cerri
2020-07-16 13:53               ` Ard Biesheuvel
2020-07-16 14:23                 ` Marcelo Henrique Cerri
2020-07-16 14:37                   ` Ard Biesheuvel
2020-07-16 14:56                     ` Marcelo Henrique Cerri
2020-07-16 15:20                       ` Ard Biesheuvel
2020-07-12 16:40   ` [PATCH v2 3/5] crypto: DH - check validity of Z before export Stephan Müller
2020-07-15 13:17     ` Marcelo Henrique Cerri
2020-07-12 16:40   ` [PATCH v2 4/5] crypto: DH SP800-56A rev 3 local public key validation Stephan Müller
2020-07-15 13:18     ` Marcelo Henrique Cerri
2020-07-12 16:42   ` [PATCH v2 5/5] crypto: ECDH " Stephan Müller
2020-07-12 18:06     ` Vitaly Chikunov
2020-07-13  5:04       ` Stephan Mueller
2020-07-13  5:59         ` Vitaly Chikunov
2020-07-13  6:02           ` Stephan Müller
2020-07-15 13:19     ` Marcelo Henrique Cerri
2020-07-20 17:05   ` [PATCH v3 0/5] DH: SP800-56A rev 3 compliant validation checks Stephan Müller
2020-07-20 17:07     ` [PATCH v3 1/5] crypto: ECDH - check validity of Z before export Stephan Müller
2020-07-22 13:11       ` Vitaly Chikunov
2020-07-24 17:47       ` Neil Horman
2020-07-20 17:08     ` [PATCH v3 2/5] lib/mpi: Add mpi_sub_ui() Stephan Müller
2020-07-20 17:08     ` [PATCH v3 3/5] crypto: DH - check validity of Z before export Stephan Müller
2020-07-24 18:02       ` Neil Horman
2020-07-20 17:08     ` [PATCH v3 4/5] crypto: DH SP800-56A rev 3 local public key validation Stephan Müller
2020-07-20 17:09     ` [PATCH v3 5/5] crypto: ECDH " Stephan Müller
2020-07-21 11:35     ` [PATCH v3 0/5] DH: SP800-56A rev 3 compliant validation checks Marcelo Henrique Cerri
2020-07-31 13:29     ` Herbert Xu [this message]

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