From 2dfc7eee89f9798d00c9f710b84f3868a3b30ae3 Mon Sep 17 00:00:00 2001
From: Daniel Pouzzner <douzzer@wolfssl.com>
Date: Thu, 7 Aug 2025 10:26:34 -0500
Subject: [PATCH] wolfcrypt/src/sp_int.c: in _sp_exptmod_nct(), use 2 bit
 window if bits <= 21.

---
 wolfcrypt/src/sp_int.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wolfcrypt/src/sp_int.c b/wolfcrypt/src/sp_int.c
index b5c832d3e..5a8222a52 100644
--- a/wolfcrypt/src/sp_int.c
+++ b/wolfcrypt/src/sp_int.c
@@ -14208,7 +14208,7 @@ static int _sp_exptmod_nct(const sp_int* b, const sp_int* e, const sp_int* m,
         winBits = 6;
     }
     else if (bits <= 21) {
-        winBits = 1;
+        winBits = 2;
     }
     else if (bits <= 36) {
         winBits = 3;