crypto: cts - Weed out non-CBC algorithms

The cts algorithm as currently implemented assumes the underlying is a CBC-mode algorithm. So this patch adds a check for that to eliminate bogus combinations of cts with non-CBC modes. Signed-off-by: Herbert Xu <[email protected]>
chewitt · Jan 20, 2015 · 988dc01 · 988dc01
1 parent 3eda716
commit 988dc01
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/crypto/cts.c b/crypto/cts.c
@@ -290,6 +290,9 @@ static struct crypto_instance *crypto_cts_alloc(struct rtattr **tb)
 	if (!is_power_of_2(alg->cra_blocksize))
 		goto out_put_alg;
 
+	if (strncmp(alg->cra_name, "cbc(", 4))
+		goto out_put_alg;
+
 	inst = crypto_alloc_instance("cts", alg);
 	if (IS_ERR(inst))
 		goto out_put_alg;