1 files changed, 2 insertions, 25 deletions
diff --git a/crypto/src/math/ec/custom/djb/Curve25519.cs b/crypto/src/math/ec/custom/djb/Curve25519.cs
index 3dbdac051..712b68f29 100644
--- a/crypto/src/math/ec/custom/djb/Curve25519.cs
+++ b/crypto/src/math/ec/custom/djb/Curve25519.cs
@@ -1,13 +1,12 @@
 using System;
 
 using Org.BouncyCastle.Math.EC.Custom.Sec;
-using Org.BouncyCastle.Math.Field;
 using Org.BouncyCastle.Utilities.Encoders;
 
 namespace Org.BouncyCastle.Math.EC.Custom.Djb
 {
     internal class Curve25519
-        :   ECCurve
+        : AbstractFpCurve
     {
         public static readonly BigInteger q = Nat256.ToBigInteger(Curve25519Field.P);
 
@@ -16,7 +15,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Djb
         protected readonly Curve25519Point m_infinity;
 
         public Curve25519()
-            :   base(FiniteFields.GetPrimeField(q))
+            : base(q)
         {
             this.m_infinity = new Curve25519Point(this, null, null);
 
@@ -74,27 +73,5 @@ namespace Org.BouncyCastle.Math.EC.Custom.Djb
         {
             return new Curve25519Point(this, x, y, zs, withCompression);
         }
-
-        protected override ECPoint DecompressPoint(int yTilde, BigInteger X1)
-        {
-            ECFieldElement x = FromBigInteger(X1);
-            ECFieldElement alpha = x.Square().Add(A).Multiply(x).Add(B);
-            ECFieldElement beta = alpha.Sqrt();
-
-            //
-            // if we can't find a sqrt we haven't got a point on the
-            // curve - run!
-            //
-            if (beta == null)
-                throw new ArithmeticException("Invalid point compression");
-
-            if (beta.TestBitZero() != (yTilde == 1))
-            {
-                // Use the other root
-                beta = beta.Negate();
-            }
-
-            return new Curve25519Point(this, x, beta, true);
-        }
     }
 }