tree a451df51aba5981cfe1b855e3ad95ec05c37f765
parent 7eac7144dd1ef11c05a5f7605de6afa3770982e4
author Herbert Xu <herbert@gondor.apana.org.au> 1434885101 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1434959356 +0800

crypto: skcipher - Allow givencrypt to be NULL

Currently for skcipher IV generators they must provide givencrypt
as that is the whole point.  We are currently replacing skcipher
IV generators with explicit IV generators.  In order to maintain
backwards compatibility, we need to allow the IV generators to
still function as a normal skcipher when the RNG Is not present
(e.g., in the initramfs during boot).  IOW everything but givencrypt
and givdecrypt will still work but those two will fail.

Therefore this patch assigns a default givencrypt that simply
returns an error should it be NULL.

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