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crypto: virtio - implement missing support for output IVs 

In order to allow for CBC to be chained, which is something that the
CTS template relies upon, implementations of CBC need to pass the
IV to be used for subsequent invocations via the IV buffer. This was
not implemented yet for virtio-crypto so implement it now.

Fixes: dbaf0624ff ("crypto: add virtio-crypto driver")
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Gonglei <arei.gonglei@huawei.com>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-11-09 18:09:26 +01:00 committed by Herbert Xu
parent 07d8f18588
commit 500e6807ce
1 changed files with 9 additions and 0 deletions
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9
drivers/crypto/virtio/virtio_crypto_algs.c
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@ -437,6 +437,11 @@ __virtio_crypto_ablkcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
goto free;
}
memcpy(iv, req->info, ivsize);
if (!vc_sym_req->encrypt)
scatterwalk_map_and_copy(req->info, req->src,
req->nbytes - AES_BLOCK_SIZE,
AES_BLOCK_SIZE, 0);
sg_init_one(&iv_sg, iv, ivsize);
sgs[num_out++] = &iv_sg;
vc_sym_req->iv = iv;
@ -563,6 +568,10 @@ static void virtio_crypto_ablkcipher_finalize_req(
struct ablkcipher_request *req,
int err)
{
if (vc_sym_req->encrypt)
scatterwalk_map_and_copy(req->info, req->dst,
req->nbytes - AES_BLOCK_SIZE,
AES_BLOCK_SIZE, 0);
crypto_finalize_ablkcipher_request(vc_sym_req->base.dataq->engine,
req, err);
kzfree(vc_sym_req->iv);