libkmod: Support SM3 hash algorithm

SM3 has been supported in kernel and cryptographic libraries like openssl.
This patch adds support for the SM3 algorithm of kmod.

Signed-off-by: HuaxinLu <luhuaxin1@huawei.com>

libkmod/libkmod-signature.c

@@ -56,6 +56,7 @@ enum pkey_hash_algo {
 	PKEY_HASH_SHA384,
 	PKEY_HASH_SHA512,
 	PKEY_HASH_SHA224,
+	PKEY_HASH_SM3,
 	PKEY_HASH__LAST
 };
 
@@ -68,6 +69,7 @@ const char *const pkey_hash_algo[PKEY_HASH__LAST] = {
 	[PKEY_HASH_SHA384]	= "sha384",
 	[PKEY_HASH_SHA512]	= "sha512",
 	[PKEY_HASH_SHA224]	= "sha224",
+	[PKEY_HASH_SM3]		= "sm3",
 };
 
 enum pkey_id_type {
@@ -161,6 +163,10 @@ static int obj_to_hash_algo(const ASN1_OBJECT *o)
 		return PKEY_HASH_SHA512;
 	case NID_sha224:
 		return PKEY_HASH_SHA224;
+# ifndef OPENSSL_NO_SM3
+	case NID_sm3:
+		return PKEY_HASH_SM3;
+# endif
 	default:
 		return -1;
 	}