[PATCH 15/29] crypto: skcipher - use scatterwalk_start_at_pos()

Eric Biggers
2024-12-21T09:11:33Z

In skcipher_walk_aead_common(), use scatterwalk_start_at_pos() instead
of a sequence of scatterwalk_start(), scatterwalk_copychunks(..., 2),
and scatterwalk_done(). This is simpler and faster.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
crypto/skcipher.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 441e1d254d36..7abafe385fd5 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -355,18 +355,12 @@ static int skcipher_walk_aead_common(struct skcipher_walk *walk,
walk->flags = 0;

if (unlikely(!walk->total))
return 0;

- scatterwalk_start(&walk->in, req->src);
- scatterwalk_start(&walk->out, req->dst);
-
- scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
- scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
-
- scatterwalk_done(&walk->in, 0, walk->total);
- scatterwalk_done(&walk->out, 0, walk->total);
+ scatterwalk_start_at_pos(&walk->in, req->src, req->assoclen);
+ scatterwalk_start_at_pos(&walk->out, req->dst, req->assoclen);

walk->blocksize = alg->base.cra_blocksize;
walk->stride = alg->chunksize;
walk->ivsize = alg->ivsize;
walk->alignmask = alg->base.cra_alignmask;
--
2.47.1