tree 361d232716f9b532789ec7480c35bba37afb33e9
parent 9ba0905f1740f4dbd26c51883511079944e9c97d
author Stephan Mueller <smueller@chronox.de> 1417341326 +0100
committer Herbert Xu <herbert@gondor.apana.org.au> 1417532146 +0800

crypto: algif_skcipher - initialize upon init request

When using the algif_skcipher, the following call sequence causess a
re-initialization:

1. sendmsg with ALG_SET_OP and iov == NULL, iovlen == 0 (i.e
initializing the cipher, but not sending data)

2. sendmsg with msg->msg-controllen == 0 and iov != NULL (using the initalized
cipher handle by sending data)

In step 2, the cipher operation type (encryption or decryption) is reset
to always decryption, because the local variable of enc is put into
ctx->enc as ctx->user is still zero.

The same applies when all send data is processed and ctx->used falls to
zero followed by user space to send new data.

This patch changes the behavior to only reset the cipher operation type
(and the IV) if such configuration request is received.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>