From: Ard Biesheuvel <ardb@kernel.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
Eric Biggers <ebiggers@kernel.org>,
Ben Greear <greearb@candelatech.com>
Subject: Re: [PATCH 0/5] crypto: Implement cmac based on cbc skcipher
Date: Tue, 18 Aug 2020 10:31:39 +0200 [thread overview]
Message-ID: <CAMj1kXFOZJFUR0N+6i2O4XGZ462Mcs8pq7y_MYScfLf-Tfy3QQ@mail.gmail.com> (raw)
In-Reply-To: <20200818082410.GA24497@gondor.apana.org.au>
On Tue, 18 Aug 2020 at 10:24, Herbert Xu <herbert@gondor.apana.org.au> wrote:
>
> On Sun, Aug 02, 2020 at 12:06:16PM +0300, Ard Biesheuvel wrote:
> > Ben reports that CCM using AES-NI instructions performs pathologically
> > poorly, which is due to the overhead of preserving/restoring the SIMD
> > state, which is repeated after every 16 bytes of input when executing
> > the CBCMAC portion of the algorithm.
> >
> > So let's clone the arm64 implementation of cbcmac(aes), which takes
> > care to only preserve/restore the SIMD state after processing the
> > whole input. Since cmac(aes) and xcbc(aes) can reuse most of the code,
> > let's expose those as well.
> >
> > Cc: Ben Greear <greearb@candelatech.com>
> > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> > ---
> > arch/x86/crypto/Makefile | 2 +-
> > arch/x86/crypto/aesni-intel.h | 39 +++
> > arch/x86/crypto/aesni-intel_glue.c | 42 +---
> > arch/x86/crypto/aesni-intel_mac.c | 257 ++++++++++++++++++++
> > 4 files changed, 306 insertions(+), 34 deletions(-)
>
> We should just use the accelerated cbc skcipher.
>
What do you mean? You cannot implement cbcmac using a cbc skcipher
unless you provide a scratch buffer of arbitrary size as the
destination, in order to capture the skcipher output IV as the MAC.
next prev parent reply other threads:[~2020-08-18 8:31 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-02 9:06 [PATCH] crypto: x86/aesni - implement accelerated CBCMAC, CMAC and XCBC shashes Ard Biesheuvel
2020-08-03 19:11 ` Ben Greear
2020-08-04 12:55 ` Ard Biesheuvel
2020-08-04 13:01 ` Ben Greear
2020-08-04 13:08 ` Ard Biesheuvel
2020-08-04 13:22 ` Ben Greear
2020-08-04 19:45 ` Ben Greear
2020-08-04 20:12 ` Ard Biesheuvel
2020-09-23 11:03 ` Ben Greear
2020-10-29 16:58 ` Ard Biesheuvel
2020-08-18 8:24 ` [PATCH 0/5] crypto: Implement cmac based on cbc skcipher Herbert Xu
2020-08-18 8:25 ` [PATCH 1/6] crypto: skcipher - Add helpers for sync skcipher spawn Herbert Xu
2020-08-18 8:25 ` [PATCH 2/6] crypto: ahash - Add helper to free single spawn instance Herbert Xu
2020-08-18 8:25 ` [PATCH 3/6] crypto: ahash - Add init_tfm/exit_tfm Herbert Xu
2020-08-18 8:25 ` [PATCH 4/6] crypto: ahash - Add ahash_alg_instance Herbert Xu
2020-08-18 8:25 ` [PATCH 5/6] crypto: ahash - Remove AHASH_REQUEST_ON_STACK Herbert Xu
2020-08-26 10:55 ` Ard Biesheuvel
2020-08-18 8:25 ` [PATCH 6/6] crypto: cmac - Use cbc skcipher instead of raw cipher Herbert Xu
2020-08-24 9:47 ` Ard Biesheuvel
2020-08-24 11:20 ` Herbert Xu
2020-08-18 8:31 ` Ard Biesheuvel [this message]
2020-08-18 13:51 ` [PATCH 0/5] crypto: Implement cmac based on cbc skcipher Herbert Xu
2020-08-18 13:56 ` Ben Greear
2020-08-18 14:05 ` Herbert Xu
2020-08-18 14:17 ` Ben Greear
2020-08-18 22:15 ` Herbert Xu
2020-08-18 22:27 ` Herbert Xu
2020-08-18 22:31 ` Ben Greear
2020-08-18 22:33 ` Herbert Xu
2020-08-18 22:39 ` Ben Greear
2020-08-20 6:58 ` Ard Biesheuvel
2020-08-20 7:01 ` Herbert Xu
2020-08-20 7:04 ` Ard Biesheuvel
2020-08-20 7:06 ` Herbert Xu
2020-08-20 7:19 ` Ard Biesheuvel
2020-08-20 7:29 ` Herbert Xu
2020-08-20 7:33 ` Ard Biesheuvel
2020-08-20 7:44 ` Herbert Xu
2020-08-20 7:48 ` Ard Biesheuvel
2020-08-20 7:53 ` Herbert Xu
2020-08-20 7:56 ` Ard Biesheuvel
2020-08-20 13:54 ` Ben Greear
2020-08-20 20:10 ` Herbert Xu
2020-08-20 22:09 ` Ben Greear
2020-08-20 22:12 ` Herbert Xu
2020-08-22 22:35 ` Christian Lamparter
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