[IPSEC]: Add support for aes-ctr.

The below patch allows IPsec to use CTR mode with AES encryption
algorithm. Tested this using setkey in ipsec-tools.

Signed-off-by: Joy Latten <latten@austin.ibm.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index 6cc15250de69..8aa6440d689f 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -399,6 +399,23 @@ static struct xfrm_algo_desc ealg_list[] = {
                 .sadb_alg_maxbits = 256
         }
 },
+{
+        .name = "rfc3686(ctr(aes))",
+
+        .uinfo = {
+                .encr = {
+                        .blockbits = 128,
+                        .defkeybits = 160, /* 128-bit key + 32-bit nonce */
+                }
+        },
+
+        .desc = {
+                .sadb_alg_id = SADB_X_EALG_AESCTR,
+                .sadb_alg_ivlen = 8,
+                .sadb_alg_minbits = 128,
+                .sadb_alg_maxbits = 256
+        }
+},
 };
 
 static struct xfrm_algo_desc calg_list[] = {