From 1ef1b040d6895cf16441c6d75e651cb59284ac77 Mon Sep 17 00:00:00 2001
From: Balazs Komuves <bkomuves@gmail.com>
Date: Thu, 29 Feb 2024 13:30:17 +0100
Subject: [PATCH] temporary workaround for the G2 MSM bug (this one seems to
 work correctly, but it is much slower)

---
 groth16/bn128/msm.nim | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/groth16/bn128/msm.nim b/groth16/bn128/msm.nim
index 14a5459..fa32cbf 100644
--- a/groth16/bn128/msm.nim
+++ b/groth16/bn128/msm.nim
@@ -61,8 +61,9 @@ func msmConstantineG2*( coeffs: openArray[Fr] , points: openArray[G2] ): G2 =
 
   var r : ProjG2
 
-  # [Fp,aff.G1]
-  msm.multiScalarMul_vartime( r,
+  # note: at the moment of writing this, `multiScalarMul_vartime` is buggy.
+  # however, the "reference" one is _much_ slower.
+  msm.multiScalarMul_reference_vartime( r,
     toOpenArray(bigcfs, 0, N-1),
     toOpenArray(points, 0, N-1) )