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[CRYPTO] seqiv: Add Sequence Number IV Generator

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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>
This commit is contained in:
Herbert Xu
2007-11-30 21:38:37 +11:00
parent 45d44eb56a
commit 0a270321db
4 changed files with 198 additions and 0 deletions
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2
crypto/ctr.c
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@@ -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;