From 7a6ee9c1f14dc8d137a37ab4a61a559340308728 Mon Sep 17 00:00:00 2001
From: Thomas Coratger <60488569+tcoratger@users.noreply.github.com>
Date: Mon, 23 Sep 2024 07:28:11 +0200
Subject: [PATCH] keccak_p: improve efficiency of Theta phase (#80)

---
 keccak/src/lib.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/keccak/src/lib.rs b/keccak/src/lib.rs
index 151e7ba..6d53286 100644
--- a/keccak/src/lib.rs
+++ b/keccak/src/lib.rs
@@ -254,9 +254,9 @@ pub fn keccak_p<L: LaneSize>(state: &mut [L; PLEN], round_count: usize) {
         });
 
         unroll5!(x, {
+            let t1 = array[(x + 4) % 5];
+            let t2 = array[(x + 1) % 5].rotate_left(1);
             unroll5!(y, {
-                let t1 = array[(x + 4) % 5];
-                let t2 = array[(x + 1) % 5].rotate_left(1);
                 state[5 * y + x] ^= t1 ^ t2;
             });
         });