diff mbox

crypto: cts - Weed out non-CBC algorithms

Message ID 20150116083817.GA9713@gondor.apana.org.au (mailing list archive)
State Accepted
Delegated to: Herbert Xu
Headers show

Commit Message

Herbert Xu Jan. 16, 2015, 8:38 a.m. UTC 
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 <herbert@gondor.apana.org.au>
diff mbox

Patch

diff --git a/crypto/cts.c b/crypto/cts.c
index 6a8089c..e467ec0 100644
--- 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;