From 9c2cba84bac32d3bbe3c6f946ee76dc416cd6bb8 Mon Sep 17 00:00:00 2001
From: J08nY
Date: Fri, 3 Oct 2025 12:50:48 +0200
Subject: Better bound in additive split.

---
 pyecsca/ec/countermeasures.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyecsca/ec/countermeasures.py b/pyecsca/ec/countermeasures.py
index eff10c2..a310ce4 100644
--- a/pyecsca/ec/countermeasures.py
+++ b/pyecsca/ec/countermeasures.py
@@ -148,7 +148,7 @@ class AdditiveSplitting(ScalarMultiplierCountermeasure):
             order = self.params.order
             r = Mod.random(order)
             s = scalar - r
-            bits = max(self.bits, order.bit_length()) + 1
+            bits = max(self.bits, order.bit_length())
             self.mult.init(self.params, self.point, bits)
             R = self.mult.multiply(int(r))
             S = self.mult.multiply(int(s))
-- 
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