[PATCH v3 15/19] crypto: x86/aegis - use the new scatterwalk functions

Eric Biggers
2025-02-19T18:24:31Z

In crypto_aegis128_aesni_process_ad(), use scatterwalk_next() which
consolidates scatterwalk_clamp() and scatterwalk_map(). Use
scatterwalk_done_src() which consolidates scatterwalk_unmap(),
scatterwalk_advance(), and scatterwalk_done().

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
arch/x86/crypto/aegis128-aesni-glue.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/x86/crypto/aegis128-aesni-glue.c b/arch/x86/crypto/aegis128-aesni-glue.c
index 01fa568dc5fc4..1bd093d073ed6 100644
--- a/arch/x86/crypto/aegis128-aesni-glue.c
+++ b/arch/x86/crypto/aegis128-aesni-glue.c
@@ -69,14 +69,14 @@ static void crypto_aegis128_aesni_process_ad(
struct 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 >= AEGIS128_BLOCK_SIZE) {
if (pos > 0) {
unsigned int fill = AEGIS128_BLOCK_SIZE - pos;
memcpy(buf.bytes + pos, src, fill);
@@ -95,13 +95,11 @@ static void crypto_aegis128_aesni_process_ad(

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, AEGIS128_BLOCK_SIZE - pos);
aegis128_aesni_ad(state, buf.bytes, AEGIS128_BLOCK_SIZE);
--
2.48.1