[PATCH v3 1/2] blk-crypto: Add support for SM4-XTS blk crypto mode

From: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
To: 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
Cc: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Subject: [PATCH v3 1/2] blk-crypto: Add support for SM4-XTS blk crypto mode
Date: Fri, 25 Nov 2022 20:16:29 +0800	[thread overview]
Message-ID: <20221125121630.87793-2-tianjia.zhang@linux.alibaba.com> (raw)
In-Reply-To: <20221125121630.87793-1-tianjia.zhang@linux.alibaba.com>

SM4 is a symmetric algorithm widely used in China, and SM4-XTS is also
used to encrypt length-preserving data, these algoritms are mandatory
in many scenarios. This patch enables the use of SM4-XTS algorithm in
block inline encryption, and provides support for fscrypt.

Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
---
 block/blk-crypto.c         | 6 ++++++
 include/linux/blk-crypto.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/block/blk-crypto.c b/block/blk-crypto.c
index a496aaef85ba..e44709fc6a08 100644
--- a/block/blk-crypto.c
+++ b/block/blk-crypto.c
@@ -36,6 +36,12 @@ const struct blk_crypto_mode blk_crypto_modes[] = {
 		.keysize = 32,
 		.ivsize = 32,
 	},
+	[BLK_ENCRYPTION_MODE_SM4_XTS] = {
+		.name = "SM4-XTS",
+		.cipher_str = "xts(sm4)",
+		.keysize = 32,
+		.ivsize = 16,
+	},
 };
 
 /*
diff --git a/include/linux/blk-crypto.h b/include/linux/blk-crypto.h
index 69b24fe92cbf..26b1b71c3091 100644
--- a/include/linux/blk-crypto.h
+++ b/include/linux/blk-crypto.h
@@ -13,6 +13,7 @@ enum blk_crypto_mode_num {
 	BLK_ENCRYPTION_MODE_AES_256_XTS,
 	BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV,
 	BLK_ENCRYPTION_MODE_ADIANTUM,
+	BLK_ENCRYPTION_MODE_SM4_XTS,
 	BLK_ENCRYPTION_MODE_MAX,
 };
 
-- 
2.24.3 (Apple Git-128)

