diff --git a/crypto/src/math/ec/custom/sec/SecP128R1Curve.cs b/crypto/src/math/ec/custom/sec/SecP128R1Curve.cs
new file mode 100644
index 000000000..9da27b470
--- /dev/null
+++ b/crypto/src/math/ec/custom/sec/SecP128R1Curve.cs
@@ -0,0 +1,78 @@
+using System;
+
+using Org.BouncyCastle.Utilities.Encoders;
+
+namespace Org.BouncyCastle.Math.EC.Custom.Sec
+{
+ internal class SecP128R1Curve
+ : AbstractFpCurve
+ {
+ public static readonly BigInteger q = new BigInteger(1,
+ Hex.Decode("FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFF"));
+
+ private const int SecP128R1_DEFAULT_COORDS = COORD_JACOBIAN;
+
+ protected readonly SecP128R1Point m_infinity;
+
+ public SecP128R1Curve()
+ : base(q)
+ {
+ this.m_infinity = new SecP128R1Point(this, null, null);
+
+ this.m_a = FromBigInteger(new BigInteger(1,
+ Hex.Decode("FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFC")));
+ this.m_b = FromBigInteger(new BigInteger(1,
+ Hex.Decode("E87579C11079F43DD824993C2CEE5ED3")));
+ this.m_order = new BigInteger(1, Hex.Decode("FFFFFFFE0000000075A30D1B9038A115"));
+ this.m_cofactor = BigInteger.One;
+
+ this.m_coord = SecP128R1_DEFAULT_COORDS;
+ }
+
+ protected override ECCurve CloneCurve()
+ {
+ return new SecP128R1Curve();
+ }
+
+ public override bool SupportsCoordinateSystem(int coord)
+ {
+ switch (coord)
+ {
+ case COORD_JACOBIAN:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ public virtual BigInteger Q
+ {
+ get { return q; }
+ }
+
+ public override ECPoint Infinity
+ {
+ get { return m_infinity; }
+ }
+
+ public override int FieldSize
+ {
+ get { return q.BitLength; }
+ }
+
+ public override ECFieldElement FromBigInteger(BigInteger x)
+ {
+ return new SecP128R1FieldElement(x);
+ }
+
+ protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, bool withCompression)
+ {
+ return new SecP128R1Point(this, x, y, withCompression);
+ }
+
+ protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, bool withCompression)
+ {
+ return new SecP128R1Point(this, x, y, zs, withCompression);
+ }
+ }
+}
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