zig

commit 83abb322478a148aeb6206e10f0f72e70d35c67d (tree)
parent 58c2bec589d6d90db31744430407bc88695b5161
Author: Frank Denis <github@pureftpd.org>
Date:   Mon, 23 Nov 2020 18:59:05 +0100

std/crypto - edwards25519 precomp: prefer doublings over adds

Doublings are a little bit faster than additions, so use them half
the time during precomputations.

Diffstat:
M
lib/std/crypto/25519/edwards25519.zig
 | 
2
+-

1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/std/crypto/25519/edwards25519.zig b/lib/std/crypto/25519/edwards25519.zig
@@ -221,7 +221,7 @@ pub const Edwards25519 = struct {
         pc[1] = p;
         var i: usize = 2;
         while (i <= count) : (i += 1) {
-            pc[i] = pc[i - 1].add(p);
+            pc[i] = if (i % 2 == 0) pc[i / 2].dbl() else pc[i - 1].add(p);
         }
         return pc;
     }