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From:   Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
To:     Herbert Xu <herbert@gondor.apana.org.au>,
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Cc:     Xufeng Zhang <yunbo.xufeng@linux.alibaba.com>,
        Jia Zhang <zhang.jia@linux.alibaba.com>,
        Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Subject: [PATCH v7 10/10] integrity: Asymmetric digsig supports SM2-with-SM3 algorithm
Date:   Mon, 21 Sep 2020 00:21:03 +0800
Message-Id: <20200920162103.83197-11-tianjia.zhang@linux.alibaba.com>
In-Reply-To: <20200920162103.83197-1-tianjia.zhang@linux.alibaba.com>
References: <20200920162103.83197-1-tianjia.zhang@linux.alibaba.com>
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Asymmetric digsig supports SM2-with-SM3 algorithm combination,
so that IMA can also verify SM2's signature data.

Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Tested-by: Xufeng Zhang <yunbo.xufeng@linux.alibaba.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Vitaly Chikunov <vt@altlinux.org>
---
 security/integrity/digsig_asymmetric.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
index cfa4127d0518..b86a4a8f61ab 100644
--- a/security/integrity/digsig_asymmetric.c
+++ b/security/integrity/digsig_asymmetric.c
@@ -99,14 +99,22 @@ int asymmetric_verify(struct key *keyring, const char *sig,
 	memset(&pks, 0, sizeof(pks));
 
 	pks.hash_algo = hash_algo_name[hdr->hash_algo];
-	if (hdr->hash_algo == HASH_ALGO_STREEBOG_256 ||
-	    hdr->hash_algo == HASH_ALGO_STREEBOG_512) {
+	switch (hdr->hash_algo) {
+	case HASH_ALGO_STREEBOG_256:
+	case HASH_ALGO_STREEBOG_512:
 		/* EC-RDSA and Streebog should go together. */
 		pks.pkey_algo = "ecrdsa";
 		pks.encoding = "raw";
-	} else {
+		break;
+	case HASH_ALGO_SM3_256:
+		/* SM2 and SM3 should go together. */
+		pks.pkey_algo = "sm2";
+		pks.encoding = "raw";
+		break;
+	default:
 		pks.pkey_algo = "rsa";
 		pks.encoding = "pkcs1";
+		break;
 	}
 	pks.digest = (u8 *)data;
 	pks.digest_size = datalen;
-- 
2.19.1.3.ge56e4f7