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using System;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecT239FieldElement
: AbstractF2mFieldElement
{
protected internal readonly ulong[] x;
public SecT239FieldElement(BigInteger x)
{
if (x == null || x.SignValue < 0 || x.BitLength > 239)
throw new ArgumentException("value invalid for SecT239FieldElement", "x");
this.x = SecT239Field.FromBigInteger(x);
}
public SecT239FieldElement()
{
this.x = Nat256.Create64();
}
protected internal SecT239FieldElement(ulong[] x)
{
this.x = x;
}
public override bool IsOne
{
get { return Nat256.IsOne64(x); }
}
public override bool IsZero
{
get { return Nat256.IsZero64(x); }
}
public override bool TestBitZero()
{
return (x[0] & 1L) != 0L;
}
public override BigInteger ToBigInteger()
{
return Nat256.ToBigInteger64(x);
}
public override string FieldName
{
get { return "SecT239Field"; }
}
public override int FieldSize
{
get { return 239; }
}
public override ECFieldElement Add(ECFieldElement b)
{
ulong[] z = Nat256.Create64();
SecT239Field.Add(x, ((SecT239FieldElement)b).x, z);
return new SecT239FieldElement(z);
}
public override ECFieldElement AddOne()
{
ulong[] z = Nat256.Create64();
SecT239Field.AddOne(x, z);
return new SecT239FieldElement(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 = Nat256.Create64();
SecT239Field.Multiply(x, ((SecT239FieldElement)b).x, z);
return new SecT239FieldElement(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 = ((SecT239FieldElement)b).x;
ulong[] xx = ((SecT239FieldElement)x).x, yx = ((SecT239FieldElement)y).x;
ulong[] tt = Nat256.CreateExt64();
SecT239Field.MultiplyAddToExt(ax, bx, tt);
SecT239Field.MultiplyAddToExt(xx, yx, tt);
ulong[] z = Nat256.Create64();
SecT239Field.Reduce(tt, z);
return new SecT239FieldElement(z);
}
public override ECFieldElement Divide(ECFieldElement b)
{
return Multiply(b.Invert());
}
public override ECFieldElement Negate()
{
return this;
}
public override ECFieldElement Square()
{
ulong[] z = Nat256.Create64();
SecT239Field.Square(x, z);
return new SecT239FieldElement(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 = ((SecT239FieldElement)x).x, yx = ((SecT239FieldElement)y).x;
ulong[] tt = Nat256.CreateExt64();
SecT239Field.SquareAddToExt(ax, tt);
SecT239Field.MultiplyAddToExt(xx, yx, tt);
ulong[] z = Nat256.Create64();
SecT239Field.Reduce(tt, z);
return new SecT239FieldElement(z);
}
public override ECFieldElement SquarePow(int pow)
{
if (pow < 1)
return this;
ulong[] z = Nat256.Create64();
SecT239Field.SquareN(x, pow, z);
return new SecT239FieldElement(z);
}
public override ECFieldElement HalfTrace()
{
ulong[] z = Nat256.Create64();
SecT239Field.HalfTrace(x, z);
return new SecT239FieldElement(z);
}
public override bool HasFastTrace
{
get { return true; }
}
public override int Trace()
{
return (int)SecT239Field.Trace(x);
}
public override ECFieldElement Invert()
{
ulong[] z = Nat256.Create64();
SecT239Field.Invert(x, z);
return new SecT239FieldElement(z);
}
public override ECFieldElement Sqrt()
{
ulong[] z = Nat256.Create64();
SecT239Field.Sqrt(x, z);
return new SecT239FieldElement(z);
}
public virtual int Representation
{
get { return F2mFieldElement.Tpb; }
}
public virtual int M
{
get { return 239; }
}
public virtual int K1
{
get { return 158; }
}
public virtual int K2
{
get { return 0; }
}
public virtual int K3
{
get { return 0; }
}
public override bool Equals(object obj)
{
return Equals(obj as SecT239FieldElement);
}
public override bool Equals(ECFieldElement other)
{
return Equals(other as SecT239FieldElement);
}
public virtual bool Equals(SecT239FieldElement other)
{
if (this == other)
return true;
if (null == other)
return false;
return Nat256.Eq64(x, other.x);
}
public override int GetHashCode()
{
return 23900158 ^ Arrays.GetHashCode(x, 0, 4);
}
}
}
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