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using System;
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecT283FieldElement
: ECFieldElement
{
protected readonly ulong[] x;
public SecT283FieldElement(BigInteger x)
{
if (x == null || x.SignValue < 0 || x.BitLength > 283)
throw new ArgumentException("value invalid for SecT283FieldElement", "x");
this.x = SecT283Field.FromBigInteger(x);
}
public SecT283FieldElement()
{
this.x = Nat320.Create64();
}
protected internal SecT283FieldElement(ulong[] x)
{
this.x = x;
}
public override bool IsOne
{
get { return Nat320.IsOne64(x); }
}
public override bool IsZero
{
get { return Nat320.IsZero64(x); }
}
public override bool TestBitZero()
{
return (x[0] & 1UL) != 0UL;
}
public override BigInteger ToBigInteger()
{
return Nat320.ToBigInteger64(x);
}
public override string FieldName
{
get { return "SecT283Field"; }
}
public override int FieldSize
{
get { return 283; }
}
public override ECFieldElement Add(ECFieldElement b)
{
ulong[] z = Nat320.Create64();
SecT283Field.Add(x, ((SecT283FieldElement)b).x, z);
return new SecT283FieldElement(z);
}
public override ECFieldElement AddOne()
{
ulong[] z = Nat320.Create64();
SecT283Field.AddOne(x, z);
return new SecT283FieldElement(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 = Nat320.Create64();
SecT283Field.Multiply(x, ((SecT283FieldElement)b).x, z);
return new SecT283FieldElement(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 = ((SecT283FieldElement)b).x;
ulong[] xx = ((SecT283FieldElement)x).x, yx = ((SecT283FieldElement)y).x;
ulong[] tt = Nat.Create64(9);
SecT283Field.MultiplyAddToExt(ax, bx, tt);
SecT283Field.MultiplyAddToExt(xx, yx, tt);
ulong[] z = Nat320.Create64();
SecT283Field.Reduce(tt, z);
return new SecT283FieldElement(z);
}
public override ECFieldElement Divide(ECFieldElement b)
{
return Multiply(b.Invert());
}
public override ECFieldElement Negate()
{
return this;
}
public override ECFieldElement Square()
{
ulong[] z = Nat320.Create64();
SecT283Field.Square(x, z);
return new SecT283FieldElement(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 = ((SecT283FieldElement)x).x, yx = ((SecT283FieldElement)y).x;
ulong[] tt = Nat.Create64(9);
SecT283Field.SquareAddToExt(ax, tt);
SecT283Field.MultiplyAddToExt(xx, yx, tt);
ulong[] z = Nat320.Create64();
SecT283Field.Reduce(tt, z);
return new SecT283FieldElement(z);
}
public override ECFieldElement SquarePow(int pow)
{
if (pow < 1)
return this;
ulong[] z = Nat320.Create64();
SecT283Field.SquareN(x, pow, z);
return new SecT283FieldElement(z);
}
public override ECFieldElement Invert()
{
ulong[] z = Nat320.Create64();
SecT283Field.Invert(x, z);
return new SecT283FieldElement(z);
}
public override ECFieldElement Sqrt()
{
return SquarePow(M - 1);
}
public virtual int Representation
{
get { return F2mFieldElement.Ppb; }
}
public virtual int M
{
get { return 283; }
}
public virtual int K1
{
get { return 5; }
}
public virtual int K2
{
get { return 7; }
}
public virtual int K3
{
get { return 12; }
}
public override bool Equals(object obj)
{
return Equals(obj as SecT283FieldElement);
}
public override bool Equals(ECFieldElement other)
{
return Equals(other as SecT283FieldElement);
}
public virtual bool Equals(SecT283FieldElement other)
{
if (this == other)
return true;
if (null == other)
return false;
return Nat320.Eq64(x, other.x);
}
public override int GetHashCode()
{
return 2831275 ^ Arrays.GetHashCode(x, 0, 5);
}
}
}
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