From 16b31b90876698d7a02cc1f1058b53b70ede6f92 Mon Sep 17 00:00:00 2001
From: Paul Miller <paul@paulmillr.com>
Date: Sun, 23 Apr 2023 18:28:47 +0000
Subject: [PATCH] edwards: use bitmask instead of exp

---
 src/abstract/edwards.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/abstract/edwards.ts b/src/abstract/edwards.ts
index f785ede..3eae5f3 100644
--- a/src/abstract/edwards.ts
+++ b/src/abstract/edwards.ts
@@ -102,7 +102,7 @@ export function twistedEdwards(curveDef: CurveType): CurveFn {
     nByteLength,
     h: cofactor,
   } = CURVE;
-  const MASK = _2n ** BigInt(nByteLength * 8);
+  const MASK = _2n << (BigInt(nByteLength * 8) - _1n);
   const modP = Fp.create; // Function overrides
 
   // sqrt(u/v)