[PATCH 10/19] crypto: sun8i-ss: do not zeroize all pad

Corentin Labbe
2022-03-17T20:56:55Z

Instead of memset all pad buffer, it is faster to only put 0 where
needed.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
index 9582ac450d08..53e5bfb99c93 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
@@ -319,7 +319,7 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
unsigned int len;
u64 fill, min_fill, byte_count;
void *pad, *result;
- int j, i, todo;
+ int j, i, k, todo;
__be64 *bebits;
__le64 *lebits;
dma_addr_t addr_res, addr_pad;
@@ -334,7 +334,6 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)

result = ss->flows[rctx->flow].result;
pad = ss->flows[rctx->flow].pad;
- memset(pad, 0, algt->alg.hash.halg.base.cra_blocksize * 2);
bf = (__le32 *)pad;

for (i = 0; i < MAX_SG; i++) {
@@ -395,7 +394,10 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
if (fill < min_fill)
fill += 64;

+ k = j;
j += (fill - min_fill) / sizeof(u32);
+ for (; k < j; k++)
+ bf[k] = 0;

switch (algt->ss_algo_id) {
case SS_ID_HASH_MD5:
--
2.34.1