[CRYPTO] seqiv: Add Sequence Number IV Generator

This generator generates an IV based on a sequence number by xoring it
with a salt.  This algorithm is mainly useful for CTR and similar modes.

This patch also sets it as the default IV generator for ctr.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/crypto/ctr.c b/crypto/ctr.c
index 1052b318aed2..2d7425f0e7b8 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -361,6 +361,8 @@ static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb)
         inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize
                                               + CTR_RFC3686_NONCE_SIZE;
 
+        inst->alg.cra_blkcipher.geniv = "seqiv";
+
         inst->alg.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);
 
         inst->alg.cra_init = crypto_rfc3686_init_tfm;