diff --git a/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs b/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
new file mode 100644
index 000000000..6dabf6a7a
--- /dev/null
+++ b/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
@@ -0,0 +1,213 @@
+using System;
+
+using Org.BouncyCastle.Math.Raw;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Math.EC.Custom.Sec
+{
+ internal class SecT409FieldElement
+ : ECFieldElement
+ {
+ protected ulong[] x;
+
+ public SecT409FieldElement(BigInteger x)
+ {
+ if (x == null || x.SignValue < 0)
+ throw new ArgumentException("value invalid for SecT409FieldElement", "x");
+
+ this.x = SecT409Field.FromBigInteger(x);
+ }
+
+ public SecT409FieldElement()
+ {
+ this.x = Nat448.Create64();
+ }
+
+ protected internal SecT409FieldElement(ulong[] x)
+ {
+ this.x = x;
+ }
+
+ public override bool IsOne
+ {
+ get { return Nat448.IsOne64(x); }
+ }
+
+ public override bool IsZero
+ {
+ get { return Nat448.IsZero64(x); }
+ }
+
+ public override bool TestBitZero()
+ {
+ return (x[0] & 1UL) != 0UL;
+ }
+
+ public override BigInteger ToBigInteger()
+ {
+ return Nat448.ToBigInteger64(x);
+ }
+
+ public override string FieldName
+ {
+ get { return "SecT409Field"; }
+ }
+
+ public override int FieldSize
+ {
+ get { return 409; }
+ }
+
+ public override ECFieldElement Add(ECFieldElement b)
+ {
+ ulong[] z = Nat448.Create64();
+ SecT409Field.Add(x, ((SecT409FieldElement)b).x, z);
+ return new SecT409FieldElement(z);
+ }
+
+ public override ECFieldElement AddOne()
+ {
+ ulong[] z = Nat448.Create64();
+ SecT409Field.AddOne(x, z);
+ return new SecT409FieldElement(z);
+ }
+
+ public override ECFieldElement Subtract(ECFieldElement b)
+ {
+ // Addition and subtraction are the same in F2m
+ return Add(b);
+ }
+
+ public override ECFieldElement Multiply(ECFieldElement b)
+ {
+ ulong[] z = Nat448.Create64();
+ SecT409Field.Multiply(x, ((SecT409FieldElement)b).x, z);
+ return new SecT409FieldElement(z);
+ }
+
+ public override ECFieldElement MultiplyMinusProduct(ECFieldElement b, ECFieldElement x, ECFieldElement y)
+ {
+ return MultiplyPlusProduct(b, x, y);
+ }
+
+ public override ECFieldElement MultiplyPlusProduct(ECFieldElement b, ECFieldElement x, ECFieldElement y)
+ {
+ ulong[] ax = this.x, bx = ((SecT409FieldElement)b).x;
+ ulong[] xx = ((SecT409FieldElement)x).x, yx = ((SecT409FieldElement)y).x;
+
+ ulong[] tt = Nat.Create64(13);
+ SecT409Field.MultiplyAddToExt(ax, bx, tt);
+ SecT409Field.MultiplyAddToExt(xx, yx, tt);
+
+ ulong[] z = Nat448.Create64();
+ SecT409Field.Reduce(tt, z);
+ return new SecT409FieldElement(z);
+ }
+
+ public override ECFieldElement Divide(ECFieldElement b)
+ {
+ return Multiply(b.Invert());
+ }
+
+ public override ECFieldElement Negate()
+ {
+ return this;
+ }
+
+ public override ECFieldElement Square()
+ {
+ ulong[] z = Nat448.Create64();
+ SecT409Field.Square(x, z);
+ return new SecT409FieldElement(z);
+ }
+
+ public override ECFieldElement SquareMinusProduct(ECFieldElement x, ECFieldElement y)
+ {
+ return SquarePlusProduct(x, y);
+ }
+
+ public override ECFieldElement SquarePlusProduct(ECFieldElement x, ECFieldElement y)
+ {
+ ulong[] ax = this.x;
+ ulong[] xx = ((SecT409FieldElement)x).x, yx = ((SecT409FieldElement)y).x;
+
+ ulong[] tt = Nat.Create64(13);
+ SecT409Field.SquareAddToExt(ax, tt);
+ SecT409Field.MultiplyAddToExt(xx, yx, tt);
+
+ ulong[] z = Nat448.Create64();
+ SecT409Field.Reduce(tt, z);
+ return new SecT409FieldElement(z);
+ }
+
+ public override ECFieldElement SquarePow(int pow)
+ {
+ if (pow < 1)
+ return this;
+
+ ulong[] z = Nat448.Create64();
+ SecT409Field.SquareN(x, pow, z);
+ return new SecT409FieldElement(z);
+ }
+
+ public override ECFieldElement Invert()
+ {
+ return new SecT409FieldElement(
+ AbstractF2mCurve.Inverse(409, new int[] { 87 }, ToBigInteger()));
+ }
+
+ public override ECFieldElement Sqrt()
+ {
+ return SquarePow(M - 1);
+ }
+
+ public virtual int Representation
+ {
+ get { return F2mFieldElement.Tpb; }
+ }
+
+ public virtual int M
+ {
+ get { return 409; }
+ }
+
+ public virtual int K1
+ {
+ get { return 87; }
+ }
+
+ public virtual int K2
+ {
+ get { return 0; }
+ }
+
+ public virtual int K3
+ {
+ get { return 0; }
+ }
+
+ public override bool Equals(object obj)
+ {
+ return Equals(obj as SecT409FieldElement);
+ }
+
+ public override bool Equals(ECFieldElement other)
+ {
+ return Equals(other as SecT409FieldElement);
+ }
+
+ public virtual bool Equals(SecT409FieldElement other)
+ {
+ if (this == other)
+ return true;
+ if (null == other)
+ return false;
+ return Nat448.Eq64(x, other.x);
+ }
+
+ public override int GetHashCode()
+ {
+ return 4090087 ^ Arrays.GetHashCode(x, 0, 7);
+ }
+ }
+}
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