Add experimental support for GLV Type A endomorphisms

1 files changed, 24 insertions, 0 deletions

diff --git a/crypto/src/math/ec/ECPoint.cs b/crypto/src/math/ec/ECPoint.cs
index 425424e32..6a7c3ecf0 100644
--- a/crypto/src/math/ec/ECPoint.cs
+++ b/crypto/src/math/ec/ECPoint.cs
@@ -306,6 +306,13 @@ namespace Org.BouncyCastle.Math.EC
                 : Curve.CreateRawPoint(RawXCoord.Multiply(scale), RawYCoord, RawZCoords, IsCompressed);
         }
 
+        public virtual ECPoint ScaleXNegateY(ECFieldElement scale)
+        {
+            return IsInfinity
+                ? this
+                : Curve.CreateRawPoint(RawXCoord.Multiply(scale), RawYCoord.Negate(), RawZCoords, IsCompressed);
+        }
+
         public virtual ECPoint ScaleY(ECFieldElement scale)
         {
             return IsInfinity
@@ -313,6 +320,13 @@ namespace Org.BouncyCastle.Math.EC
                 : Curve.CreateRawPoint(RawXCoord, RawYCoord.Multiply(scale), RawZCoords, IsCompressed);
         }
 
+        public virtual ECPoint ScaleYNegateX(ECFieldElement scale)
+        {
+            return IsInfinity
+                ? this
+                : Curve.CreateRawPoint(RawXCoord.Negate(), RawYCoord.Multiply(scale), RawZCoords, IsCompressed);
+        }
+
         public override bool Equals(object obj)
         {
             return Equals(obj as ECPoint);
@@ -1500,6 +1514,11 @@ namespace Org.BouncyCastle.Math.EC
             }
         }
 
+        public override ECPoint ScaleXNegateY(ECFieldElement scale)
+        {
+            return ScaleX(scale);
+        }
+
         public override ECPoint ScaleY(ECFieldElement scale)
         {
             if (this.IsInfinity)
@@ -1524,6 +1543,11 @@ namespace Org.BouncyCastle.Math.EC
             }
         }
 
+        public override ECPoint ScaleYNegateX(ECFieldElement scale)
+        {
+            return ScaleY(scale);
+        }
+
         public override ECPoint Subtract(ECPoint b)
         {
             if (b.IsInfinity)