From 02d72fbeeae5b5d36da28462acd9698edccbb9b2 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Sat, 9 Nov 2019 18:09:26 +0100 Subject: [PATCH] crypto: virtio - implement missing support for output IVs 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" Cc: Jason Wang Cc: Gonglei Cc: virtualization@lists.linux-foundation.org Signed-off-by: Ard Biesheuvel Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- drivers/crypto/virtio/virtio_crypto_algs.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c b/drivers/crypto/virtio/virtio_crypto_algs.c index 523b712770ac..38432721069f 100644 --- 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 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; @@ -585,6 +590,10 @@ 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);