[git commit] tls: P256: remove redundant zeroing in sp_256_map_8

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=8cbb70365f653397c8c2b9370214d5aed36ec9fa
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

Previous change made it obvious that we zero out already-zeroed high bits

function                                             old     new   delta
sp_256_ecc_mulmod_8                                  534     494     -40

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 networking/tls_sp_c32.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/networking/tls_sp_c32.c b/networking/tls_sp_c32.c
index 74ded2cda..baed62f41 100644
--- a/networking/tls_sp_c32.c
+++ b/networking/tls_sp_c32.c
@@ -1062,7 +1062,6 @@ static void sp_256_map_8(sp_point* r, sp_point* p)
 
 	/* x /= z^2 */
 	sp_256to512z_mont_mul_8(r->x, p->x, t2 /*, p256_mod, p256_mp_mod*/);
-	memset(r->x + 8, 0, sizeof(r->x) / 2);
 	sp_512to256_mont_reduce_8(r->x /*, p256_mod, p256_mp_mod*/);
 	/* Reduce x to less than modulus */
 	if (sp_256_cmp_8(r->x, p256_mod) >= 0)
@@ -1071,7 +1070,6 @@ static void sp_256_map_8(sp_point* r, sp_point* p)
 
 	/* y /= z^3 */
 	sp_256to512z_mont_mul_8(r->y, p->y, t1 /*, p256_mod, p256_mp_mod*/);
-	memset(r->y + 8, 0, sizeof(r->y) / 2);
 	sp_512to256_mont_reduce_8(r->y /*, p256_mod, p256_mp_mod*/);
 	/* Reduce y to less than modulus */
 	if (sp_256_cmp_8(r->y, p256_mod) >= 0)