[PATCH v3 8/8] integrity: Asymmetric digsig supports SM2-with-SM3 algorithm

From: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
To: herbert@gondor.apana.org.au, davem@davemloft.net,
	dhowells@redhat.com, mcoquelin.stm32@gmail.com,
	alexandre.torgue@st.com, jmorris@namei.org, serge@hallyn.com,
	nramas@linux.microsoft.com, tusharsu@linux.microsoft.com,
	zohar@linux.ibm.com, gilad@benyossef.com, pvanleeuwen@rambus.com
Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	keyrings@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-security-module@vger.kernel.org,
	zhang.jia@linux.alibaba.com, tianjia.zhang@linux.alibaba.com
Subject: [PATCH v3 8/8] integrity: Asymmetric digsig supports SM2-with-SM3 algorithm
Date: Tue,  9 Jun 2020 21:48:55 +0800	[thread overview]
Message-ID: <20200609134855.21431-9-tianjia.zhang@linux.alibaba.com> (raw)
In-Reply-To: <20200609134855.21431-1-tianjia.zhang@linux.alibaba.com>

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>
---
 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 4e0d6778277e..9350fcfb9bf2 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;
-- 
2.17.1

