Fix possible NPE when cofactor != 1 (from bc-java)

1 files changed, 1 insertions, 1 deletions

diff --git a/crypto/src/math/ec/multiplier/WNafUtilities.cs b/crypto/src/math/ec/multiplier/WNafUtilities.cs

index 5491297d7..7d565dfbd 100644
--- a/crypto/src/math/ec/multiplier/WNafUtilities.cs
+++ b/crypto/src/math/ec/multiplier/WNafUtilities.cs
@@ -423,7 +423,7 @@ namespace Org.BouncyCastle.Math.EC.Multiplier
                              *      1) additions do not use the curve's A, B coefficients.
                              *      2) no special cases (i.e. Q +/- Q) when calculating 1P, 3P, 5P, ...
                              */
-                            if (ECAlgorithms.IsFpCurve(c) && c.FieldSize >= 64)
+                            if (!twiceP.IsInfinity && ECAlgorithms.IsFpCurve(c) && c.FieldSize >= 64)
                             {
                                 switch (c.CoordinateSystem)
                                 {