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Message-ID: <93a9e613-c4ee-e2f8-63d0-45119c031670@linux.alibaba.com>
Date:   Tue, 25 Oct 2022 15:40:53 +0800
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Subject: Re: [PATCH v2 12/15] crypto: arm64/sm4 - add CE implementation for
 ESSIV mode
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To:     Eric Biggers <ebiggers@kernel.org>
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Jussi Kivilinna <jussi.kivilinna@iki.fi>,
        Ard Biesheuvel <ardb@kernel.org>,
        Mark Brown <broonie@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com
References: <20221018071006.5717-1-tianjia.zhang@linux.alibaba.com>
 <20221018071006.5717-13-tianjia.zhang@linux.alibaba.com>
 <Y1DHb66VYPzFlTwh@sol.localdomain>
 <6d2a98f4-c50d-d05b-4a24-08fdd3ee20fa@linux.alibaba.com>
 <Y1dyNWSdCesQlWm8@sol.localdomain>
From:   Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
In-Reply-To: <Y1dyNWSdCesQlWm8@sol.localdomain>
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Hi Eric,

On 10/25/22 1:20 PM, Eric Biggers wrote:
> On Fri, Oct 21, 2022 at 10:47:14AM +0800, Tianjia Zhang wrote:
>> 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@linux.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.
>>
> 
> The only reason that AES-CBC-ESSIV support was added to fs/crypto/ was because
> someone had a low-power embedded device with a hardware crypto accelerator that
> only supported AES-CBC.
> 
> Nothing like that is relevant here, as this is just a software implementation.
> 
> Please just don't include ESSIV.  There's no need to implement random useless
> algorithms.  It could always be added later if a use case actually arises.
> 
> - Eric

Thanks for this information, I will remove the ESSIV code in the next
patch.

Best regards,
Tianjia