From 63a75c6d8ab03a0a48f8157daf49df10a5f2ec0f Mon Sep 17 00:00:00 2001
From: Loup Vaillant <loup@loup-vaillant.fr>
Date: Thu, 13 Aug 2020 16:34:51 +0200
Subject: [PATCH] Small carry simplification

---
 src/monocypher.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/monocypher.c b/src/monocypher.c
index ef052fb..9f4715e 100644
--- a/src/monocypher.c
+++ b/src/monocypher.c
@@ -1143,8 +1143,7 @@ static void fe_tobytes(u8 s[32], const fe h)
         q += t[2*i  ]; q >>= 26;
         q += t[2*i+1]; q >>= 25;
     }
-    t[0] += 19 * q;
-    q = 0;
+    q *= 19;  // Shift carry back to the begining
     FOR (i, 0, 5) {
         t[i*2  ] += q;  q = t[i*2  ] >> 26;  t[i*2  ] -= q * ((i32)1 << 26);
         t[i*2+1] += q;  q = t[i*2+1] >> 25;  t[i*2+1] -= q * ((i32)1 << 25);
-- 
2.47.3