linux-kernel - [PATCH 1/2] crypto: sm3 - add a new alias name sm3-256

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Date:   Fri,  7 Feb 2020 17:22:18 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        zohar@...ux.ibm.com, dmitry.kasatkin@...il.com, jmorris@...ei.org,
        serge@...lyn.com
Cc:     linux-crypto@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] crypto: sm3 - add a new alias name sm3-256

The name sm3-256 is defined in hash_algo_name in hash_info, but the
algorithm name implemented in sm3_generic.c is sm3, which will cause
the sm3-256 algorithm to be not found in some application scenarios of
the hash algorithm, and an ENOENT error will occur. For example,
IMA, keys, and other subsystems that reference hash_algo_name cannot use
the hash algorithm of sm3. This patch adds an alias name sm3-256 to sm3,
which can better solve the above problems.

Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
---
 crypto/sm3_generic.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/crypto/sm3_generic.c b/crypto/sm3_generic.c
index 3468975215ca..ded41031bd5f 100644
--- a/crypto/sm3_generic.c
+++ b/crypto/sm3_generic.c
@@ -163,7 +163,7 @@ int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
 }
 EXPORT_SYMBOL(crypto_sm3_finup);
 
-static struct shash_alg sm3_alg = {
+static struct shash_alg sm3_algs[2] = { {
 	.digestsize	=	SM3_DIGEST_SIZE,
 	.init		=	sm3_base_init,
 	.update		=	crypto_sm3_update,
@@ -176,16 +176,28 @@ static struct shash_alg sm3_alg = {
 		.cra_blocksize	 =	SM3_BLOCK_SIZE,
 		.cra_module	 =	THIS_MODULE,
 	}
-};
+}, {
+	.digestsize	=	SM3_DIGEST_SIZE,
+	.init		=	sm3_base_init,
+	.update		=	crypto_sm3_update,
+	.final		=	sm3_final,
+	.finup		=	crypto_sm3_finup,
+	.descsize	=	sizeof(struct sm3_state),
+	.base		=	{
+		.cra_name	 =	"sm3-256",
+		.cra_blocksize	 =	SM3_BLOCK_SIZE,
+		.cra_module	 =	THIS_MODULE,
+	}
+} };
 
 static int __init sm3_generic_mod_init(void)
 {
-	return crypto_register_shash(&sm3_alg);
+	return crypto_register_shashes(sm3_algs, ARRAY_SIZE(sm3_algs));
 }
 
 static void __exit sm3_generic_mod_fini(void)
 {
-	crypto_unregister_shash(&sm3_alg);
+	crypto_unregister_shashes(sm3_algs, ARRAY_SIZE(sm3_algs));
 }
 
 subsys_initcall(sm3_generic_mod_init);
@@ -196,3 +208,4 @@ MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
 
 MODULE_ALIAS_CRYPTO("sm3");
 MODULE_ALIAS_CRYPTO("sm3-generic");
+MODULE_ALIAS_CRYPTO("sm3-256");
-- 
2.17.1