[PATCH 16/29] crypto: aegis - use the new scatterwalk functions

Eric Biggers
2024-12-21T09:11:34Z

Use scatterwalk_next() which consolidates scatterwalk_clamp() and
scatterwalk_map(), and use scatterwalk_done_src() which consolidates
scatterwalk_unmap(), scatterwalk_advance(), and scatterwalk_done().

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
crypto/aegis128-core.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/crypto/aegis128-core.c b/crypto/aegis128-core.c
index 6cbff298722b..15d64d836356 100644
--- a/crypto/aegis128-core.c
+++ b/crypto/aegis128-core.c
@@ -282,14 +282,14 @@ static void crypto_aegis128_process_ad(struct aegis_state *state,
union aegis_block buf;
unsigned int pos = 0;

scatterwalk_start(&walk, sg_src);
while (assoclen != 0) {
- unsigned int size = scatterwalk_clamp(&walk, assoclen);
+ unsigned int size;
+ const u8 *mapped = scatterwalk_next(&walk, assoclen, &size);
unsigned int left = size;
- void *mapped = scatterwalk_map(&walk);
- const u8 *src = (const u8 *)mapped;
+ const u8 *src = mapped;

if (pos + size >= AEGIS_BLOCK_SIZE) {
if (pos > 0) {
unsigned int fill = AEGIS_BLOCK_SIZE - pos;
memcpy(buf.bytes + pos, src, fill);
@@ -306,13 +306,11 @@ static void crypto_aegis128_process_ad(struct aegis_state *state,

memcpy(buf.bytes + pos, src, left);

pos += left;
assoclen -= size;
- scatterwalk_unmap(mapped);
- scatterwalk_advance(&walk, size);
- scatterwalk_done(&walk, 0, assoclen);
+ scatterwalk_done_src(&walk, mapped, size);
}

if (pos > 0) {
memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
crypto_aegis128_update_a(state, &buf, do_simd);
--
2.47.1