From: Ard Biesheuvel <[email protected]>
commit 500e6807ce93b1fdc7d5b827c5cc167cc35630db upstream.
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: dbaf0624ffa5 ("crypto: add virtio-crypto driver")
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Gonglei <[email protected]>
Cc: [email protected]
Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/crypto/virtio/virtio_crypto_algs.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/crypto/virtio/virtio_crypto_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_algs.c
@@ -449,6 +449,11 @@ __virtio_crypto_ablkcipher_do_req(struct
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;
@@ -585,6 +590,10 @@ static void virtio_crypto_ablkcipher_fin
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);
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