[PATCH net-next 0/2] xfrm: Add support for SM3 and SM4

These patches add xfrm support for SM3 and SM4 algorithms which are
cryptographic standards published by China State Cryptography 
Administration.

SM3 secure hash (OSCCA GM/T 0004-2012 SM3) is based on Merkle-Damgard 
with a thuncation of 256 bits. It could be used for authentication 
and random number generation.

SM4 symmetric ciper algorithm (OSCCA GB/T 32097-2016) has at least 128
bits packet length which is similar to AES ciper algorithm. It is 
suitable for the use of block ciphers in cryptographic applications.

As SM3 and SM4 have already been supported by Linux kernel,
after these patches, we can use them with "ip xfrm" tools easily.


Xu Jia (2):
  xfrm: Add support for SM3 secure hash
  xfrm: Add support for SM4 symmetric cipher algorithm

 include/uapi/linux/pfkeyv2.h |  2 ++
 net/xfrm/xfrm_algo.c         | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

-- 
1.8.3.1

This patch allows IPsec to use SM3 HMAC authentication algorithm.

Signed-off-by: Xu Jia <redacted>
---
 include/uapi/linux/pfkeyv2.h |  1 +
 net/xfrm/xfrm_algo.c         | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/uapi/linux/pfkeyv2.h b/include/uapi/linux/pfkeyv2.h
index d65b117..798ba9f 100644
--- a/include/uapi/linux/pfkeyv2.h
+++ b/include/uapi/linux/pfkeyv2.h

@@ -309,6 +309,7 @@ struct sadb_x_filter {
 #define SADB_X_AALG_SHA2_512HMAC	7
 #define SADB_X_AALG_RIPEMD160HMAC	8
 #define SADB_X_AALG_AES_XCBC_MAC	9
+#define SADB_X_AALG_SM3_256HMAC		10
 #define SADB_X_AALG_NULL		251	/* kame */
 #define SADB_AALG_MAX			251
 

diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index 4dae3ab..00b5444 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c

@@ -341,6 +341,26 @@
 
 	.pfkey_supported = 0,
 },
+{
+	.name = "hmac(sm3)",
+	.compat = "sm3",
+
+	.uinfo = {
+		.auth = {
+			.icv_truncbits = 256,
+			.icv_fullbits = 256,
+		}
+	},
+
+	.pfkey_supported = 1,
+
+	.desc = {
+		.sadb_alg_id = SADB_X_AALG_SM3_256HMAC,
+		.sadb_alg_ivlen = 0,
+		.sadb_alg_minbits = 256,
+		.sadb_alg_maxbits = 256
+	}
+},
 };
 
 static struct xfrm_algo_desc ealg_list[] = {

-- 
1.8.3.1

This patch adds SM4 encryption algorithm entry to ealg_list.

Signed-off-by: Xu Jia <redacted>
---
 include/uapi/linux/pfkeyv2.h |  1 +
 net/xfrm/xfrm_algo.c         | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/uapi/linux/pfkeyv2.h b/include/uapi/linux/pfkeyv2.h
index 798ba9f..8abae1f 100644
--- a/include/uapi/linux/pfkeyv2.h
+++ b/include/uapi/linux/pfkeyv2.h

@@ -330,6 +330,7 @@ struct sadb_x_filter {
 #define SADB_X_EALG_AES_GCM_ICV16	20
 #define SADB_X_EALG_CAMELLIACBC		22
 #define SADB_X_EALG_NULL_AES_GMAC	23
+#define SADB_X_EALG_SM4CBC		24
 #define SADB_EALG_MAX                   253 /* last EALG */
 /* private allocations should use 249-255 (RFC2407) */
 #define SADB_X_EALG_SERPENTCBC  252     /* draft-ietf-ipsec-ciph-aes-cbc-00 */

diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index 00b5444..094734f 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c

@@ -572,6 +572,27 @@
 		.sadb_alg_maxbits = 288
 	}
 },
+{
+	.name = "cbc(sm4)",
+	.compat = "sm4",
+
+	.uinfo = {
+		.encr = {
+			.geniv = "echainiv",
+			.blockbits = 128,
+			.defkeybits = 128,
+		}
+	},
+
+	.pfkey_supported = 1,
+
+	.desc = {
+		.sadb_alg_id = SADB_X_EALG_SM4CBC,
+		.sadb_alg_ivlen	= 16,
+		.sadb_alg_minbits = 128,
+		.sadb_alg_maxbits = 256
+	}
+},
 };
 
 static struct xfrm_algo_desc calg_list[] = {

-- 
1.8.3.1

On Wed, Dec 22, 2021 at 05:06:57PM +0800, Xu Jia wrote:

These patches add xfrm support for SM3 and SM4 algorithms which are
cryptographic standards published by China State Cryptography 
Administration.

SM3 secure hash (OSCCA GM/T 0004-2012 SM3) is based on Merkle-Damgard 
with a thuncation of 256 bits. It could be used for authentication 
and random number generation.

SM4 symmetric ciper algorithm (OSCCA GB/T 32097-2016) has at least 128
bits packet length which is similar to AES ciper algorithm. It is 
suitable for the use of block ciphers in cryptographic applications.

As SM3 and SM4 have already been supported by Linux kernel,
after these patches, we can use them with "ip xfrm" tools easily.


Xu Jia (2):
  xfrm: Add support for SM3 secure hash
  xfrm: Add support for SM4 symmetric cipher algorithm

 include/uapi/linux/pfkeyv2.h |  2 ++
 net/xfrm/xfrm_algo.c         | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

Series applied to ipsec-next, thanks a lot!