linux-kernel - Re: [PATCH v2 12/15] crypto: arm64/sm4 - add CE implementation for ESSIV mode

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Message-ID: <6d2a98f4-c50d-d05b-4a24-08fdd3ee20fa@linux.alibaba.com>
Date:   Fri, 21 Oct 2022 10:47:14 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jussi Kivilinna <jussi.kivilinna@....fi>,
        Ard Biesheuvel <ardb@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH v2 12/15] crypto: arm64/sm4 - add CE implementation for
 ESSIV mode

Hi Eric,

On 10/20/22 11:58 AM, Eric Biggers wrote:
> On Tue, Oct 18, 2022 at 03:10:03PM +0800, Tianjia Zhang wrote:
>> This patch is a CE-optimized assembly implementation for ESSIV mode.
>> The assembly part is realized by reusing the CBC mode.
>>
>> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
> 
> Is there still a use case for CBC-ESSIV mode these days, now that everyone is
> using XTS instead?
> 
> - Eric

The mainstream is already using XTS, but CBC-ESSIV is still an optional
backup algorithm, especially in block crypto and fscrypto, I'm currently
working on supporting the SM4 algorithm for these subsystems.

Cheers,
Tianjia