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Ts o" , Jaegeuk Kim , Eric Biggers , Jonathan Corbet , Jens Axboe , linux-fscrypt@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Cc: Tianjia Zhang Subject: [PATCH 2/2] fscrypt: Add SM4 XTS/CTS symmetric algorithm support Date: Wed, 16 Nov 2022 16:24:16 +0800 Message-Id: <20221116082416.98977-3-tianjia.zhang@linux.alibaba.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20221116082416.98977-1-tianjia.zhang@linux.alibaba.com> References: <20221116082416.98977-1-tianjia.zhang@linux.alibaba.com> MIME-Version: 1.0 X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749640996964359034?= X-GMAIL-MSGID: =?utf-8?q?1749640996964359034?= SM4 is a symmetric algorithm widely used in China, this patch enables to use SM4-XTS mode to encrypt file content, and use SM4-CBC-CTS to encrypt filename. Signed-off-by: Tianjia Zhang --- Documentation/filesystems/fscrypt.rst | 1 + fs/crypto/fscrypt_private.h | 2 +- fs/crypto/keysetup.c | 15 +++++++++++++++ fs/crypto/policy.c | 4 ++++ include/uapi/linux/fscrypt.h | 4 +++- 5 files changed, 24 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst index 5ba5817c17c2..af27e7b2c74f 100644 --- a/Documentation/filesystems/fscrypt.rst +++ b/Documentation/filesystems/fscrypt.rst @@ -336,6 +336,7 @@ Currently, the following pairs of encryption modes are supported: - AES-256-XTS for contents and AES-256-CTS-CBC for filenames - AES-128-CBC for contents and AES-128-CTS-CBC for filenames +- SM4-XTS for contents and SM4-CTS-CBC for filenames - Adiantum for both contents and filenames - AES-256-XTS for contents and AES-256-HCTR2 for filenames (v2 policies only) diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index d5f68a0c5d15..e79a701de028 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -31,7 +31,7 @@ #define FSCRYPT_CONTEXT_V2 2 /* Keep this in sync with include/uapi/linux/fscrypt.h */ -#define FSCRYPT_MODE_MAX FSCRYPT_MODE_AES_256_HCTR2 +#define FSCRYPT_MODE_MAX FSCRYPT_MODE_SM4_CTS struct fscrypt_context_v1 { u8 version; /* FSCRYPT_CONTEXT_V1 */ diff --git a/fs/crypto/keysetup.c b/fs/crypto/keysetup.c index f7407071a952..c0a3f882f5a4 100644 --- a/fs/crypto/keysetup.c +++ b/fs/crypto/keysetup.c @@ -59,6 +59,21 @@ struct fscrypt_mode fscrypt_modes[] = { .security_strength = 32, .ivsize = 32, }, + [FSCRYPT_MODE_SM4_XTS] = { + .friendly_name = "SM4-XTS", + .cipher_str = "xts(sm4)", + .keysize = 32, + .security_strength = 16, + .ivsize = 16, + .blk_crypto_mode = BLK_ENCRYPTION_MODE_SM4_XTS, + }, + [FSCRYPT_MODE_SM4_CTS] = { + .friendly_name = "SM4-CTS", + .cipher_str = "cts(cbc(sm4))", + .keysize = 16, + .security_strength = 16, + .ivsize = 16, + }, }; static DEFINE_MUTEX(fscrypt_mode_key_setup_mutex); diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c index 46757c3052ef..4881fd3af6ee 100644 --- a/fs/crypto/policy.c +++ b/fs/crypto/policy.c @@ -75,6 +75,10 @@ static bool fscrypt_valid_enc_modes_v1(u32 contents_mode, u32 filenames_mode) filenames_mode == FSCRYPT_MODE_ADIANTUM) return true; + if (contents_mode == FSCRYPT_MODE_SM4_XTS && + filenames_mode == FSCRYPT_MODE_SM4_CTS) + return true; + return false; } diff --git a/include/uapi/linux/fscrypt.h b/include/uapi/linux/fscrypt.h index a756b29afcc2..34d791bd162c 100644 --- a/include/uapi/linux/fscrypt.h +++ b/include/uapi/linux/fscrypt.h @@ -28,7 +28,9 @@ #define FSCRYPT_MODE_AES_128_CTS 6 #define FSCRYPT_MODE_ADIANTUM 9 #define FSCRYPT_MODE_AES_256_HCTR2 10 -/* If adding a mode number > 10, update FSCRYPT_MODE_MAX in fscrypt_private.h */ +#define FSCRYPT_MODE_SM4_XTS 11 +#define FSCRYPT_MODE_SM4_CTS 12 +/* If adding a mode number > 12, update FSCRYPT_MODE_MAX in fscrypt_private.h */ /* * Legacy policy version; ad-hoc KDF and no key verification.