Re: [PATCH v3 2/2] fscrypt: Add SM4 XTS/CTS symmetric algorithm support

From: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
To: Bagas Sanjaya <bagasdotme@gmail.com>,
	Eric Biggers <ebiggers@kernel.org>,
	"Theodore Y. Ts o" <tytso@mit.edu>,
	Jaegeuk Kim <jaegeuk@kernel.org>,
	Jonathan Corbet <corbet@lwn.net>, Jens Axboe <axboe@kernel.dk>,
	Ard Biesheuvel <ardb@kernel.org>,
	linux-fscrypt@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org
Subject: Re: [PATCH v3 2/2] fscrypt: Add SM4 XTS/CTS symmetric algorithm support
Date: Thu, 1 Dec 2022 20:45:58 +0800	[thread overview]
Message-ID: <fc2c7a50-6330-b9d5-6f50-0c6e2ccfb680@linux.alibaba.com> (raw)
In-Reply-To: <1a5e57be-ccff-f281-6e06-be5e59db1d05@gmail.com>

Hi Bagas,

On 11/28/22 9:33 PM, Bagas Sanjaya wrote:
> On 11/25/22 19:16, Tianjia Zhang wrote:
>> SM4 is a symmetric algorithm widely used in China, and is even mandatory
>> in many scenarios. We need to provide these users with the ability to
>> encrypt files or disks using SM4-XTS, and many other algorithms that use
>> SM2/3/4 algorithms or their combined algorithm scenarios, these features
>> are demanded by many users, this patch enables to use SM4-XTS mode to
>> encrypt file content, and use SM4-CBC-CTS to encrypt filename.
>>
> 
> Similar reply as [1]. That is, better say:
> 
> ```
> Add support for XTS and CTS mode variant of SM4 algorithm, in similar
> fashion to SM2 and SM3. The former is used to encrypt file contents, while
> the latter (SM4-CBC-CTS) is used to encrypt filenames.
> ```
> 
> Thanks.
> 
> [1]: https://lore.kernel.org/linux-doc/42624542-6ccb-26a5-db98-d7944972246e@gmail.com/
> 

Thanks for your reply, it is very valuable for me, I will update it in
the next patch.

Cheers,
Tianjia