From a5697709ba9cd8bb0c2de794852df6fdfadf8ebf Mon Sep 17 00:00:00 2001
From: J08nY
Date: Thu, 21 Sep 2023 15:58:24 +0200
Subject: Omit y-calculation in divpoly mult-by-n map if unnecessary.

---
 pyecsca/sca/re/zvp.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'pyecsca/sca')

diff --git a/pyecsca/sca/re/zvp.py b/pyecsca/sca/re/zvp.py
index a92e860..108c9ac 100644
--- a/pyecsca/sca/re/zvp.py
+++ b/pyecsca/sca/re/zvp.py
@@ -190,8 +190,7 @@ def subs_dlog(poly: Poly, k: int, curve: EllipticCurve):
     new_gens = set(gens)
     new_gens.remove(x2)
 
-    mx, my = mult_by_n(curve, k)
-    # TODO: my is unnecessary here so maybe add a function to not compute it (speedup).
+    mx, _ = mult_by_n(curve, k, x_only=True)
     u, v = mx[0].subs("x", x1), mx[1].subs("x", x1)
 
     # The polynomials are quite dense, hence it makes sense
-- 
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