crypto: hisilicon/sec2 - Fix aead authentication setting key error

mainline inclusion
from mainline-v5.11-rc1
commit 5761498c
category: bugfix
bugzilla: 173981
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5761498c4d074560b38a203000afc6e971ffaa7f

----------------------------------------------------------------------

Fix aead auth setting key process error. if use soft shash function, driver
need to use digest size replace of the user input key length.
Signed-off-by: NKai Ye <yekai13@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NMingqiang Ling <lingmingqiang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/crypto/hisilicon/sec2/sec_crypto.c

@@ -857,7 +857,7 @@ static int sec_aead_auth_set_key(struct sec_auth_ctx *ctx,
 				 struct crypto_authenc_keys *keys)
 {
 	struct crypto_shash *hash_tfm = ctx->hash_tfm;
-	int blocksize, ret;
+	int blocksize, digestsize, ret;
 
 	if (!keys->authkeylen) {
 		pr_err("hisi_sec2: aead auth key error!\n");
@@ -865,6 +865,7 @@ static int sec_aead_auth_set_key(struct sec_auth_ctx *ctx,
 	}
 
 	blocksize = crypto_shash_blocksize(hash_tfm);
+	digestsize = crypto_shash_digestsize(hash_tfm);
 	if (keys->authkeylen > blocksize) {
 		ret = crypto_shash_tfm_digest(hash_tfm, keys->authkey,
 					      keys->authkeylen, ctx->a_key);
@@ -872,7 +873,7 @@ static int sec_aead_auth_set_key(struct sec_auth_ctx *ctx,
 			pr_err("hisi_sec2: aead auth digest error!\n");
 			return -EINVAL;
 		}
-		ctx->a_key_len = blocksize;
+		ctx->a_key_len = digestsize;
 	} else {
 		memcpy(ctx->a_key, keys->authkey, keys->authkeylen);
 		ctx->a_key_len = keys->authkeylen;