SM2P256V1FieldElement
using Org.BouncyCastle.Math.Raw;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Encoders;
using System;
namespace Org.BouncyCastle.Math.EC.Custom.GM
{
internal class SM2P256V1FieldElement : AbstractFpFieldElement
{
public static readonly BigInteger Q = new BigInteger(1, Hex.DecodeStrict("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF"));
protected internal readonly uint[] x;
public override bool IsZero => Nat256.IsZero(x);
public override bool IsOne => Nat256.IsOne(x);
public override string FieldName => "SM2P256V1Field";
public override int FieldSize => Q.BitLength;
public SM2P256V1FieldElement(BigInteger x)
{
if (x == null || x.SignValue < 0 || x.CompareTo(Q) >= 0)
throw new ArgumentException("value invalid for SM2P256V1FieldElement", "x");
this.x = SM2P256V1Field.FromBigInteger(x);
}
public SM2P256V1FieldElement()
{
x = Nat256.Create();
}
protected internal SM2P256V1FieldElement(uint[] x)
{
this.x = x;
}
public override bool TestBitZero()
{
return Nat256.GetBit(x, 0) == 1;
}
public override BigInteger ToBigInteger()
{
return Nat256.ToBigInteger(x);
}
public override ECFieldElement Add(ECFieldElement b)
{
uint[] z = Nat256.Create();
SM2P256V1Field.Add(x, ((SM2P256V1FieldElement)b).x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement AddOne()
{
uint[] z = Nat256.Create();
SM2P256V1Field.AddOne(x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement Subtract(ECFieldElement b)
{
uint[] z = Nat256.Create();
SM2P256V1Field.Subtract(x, ((SM2P256V1FieldElement)b).x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement Multiply(ECFieldElement b)
{
uint[] z = Nat256.Create();
SM2P256V1Field.Multiply(x, ((SM2P256V1FieldElement)b).x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement Divide(ECFieldElement b)
{
uint[] z = Nat256.Create();
SM2P256V1Field.Inv(((SM2P256V1FieldElement)b).x, z);
SM2P256V1Field.Multiply(z, x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement Negate()
{
uint[] z = Nat256.Create();
SM2P256V1Field.Negate(x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement Square()
{
uint[] z = Nat256.Create();
SM2P256V1Field.Square(x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement Invert()
{
uint[] z = Nat256.Create();
SM2P256V1Field.Inv(x, z);
return new SM2P256V1FieldElement(z);
}
public override ECFieldElement Sqrt()
{
uint[] y = x;
if (Nat256.IsZero(y) || Nat256.IsOne(y))
return this;
uint[] array = Nat256.Create();
SM2P256V1Field.Square(y, array);
SM2P256V1Field.Multiply(array, y, array);
uint[] array2 = Nat256.Create();
SM2P256V1Field.SquareN(array, 2, array2);
SM2P256V1Field.Multiply(array2, array, array2);
uint[] array3 = Nat256.Create();
SM2P256V1Field.SquareN(array2, 2, array3);
SM2P256V1Field.Multiply(array3, array, array3);
uint[] array4 = array;
SM2P256V1Field.SquareN(array3, 6, array4);
SM2P256V1Field.Multiply(array4, array3, array4);
uint[] array5 = Nat256.Create();
SM2P256V1Field.SquareN(array4, 12, array5);
SM2P256V1Field.Multiply(array5, array4, array5);
uint[] array6 = array4;
SM2P256V1Field.SquareN(array5, 6, array6);
SM2P256V1Field.Multiply(array6, array3, array6);
uint[] array7 = array3;
SM2P256V1Field.Square(array6, array7);
SM2P256V1Field.Multiply(array7, y, array7);
uint[] z = array5;
SM2P256V1Field.SquareN(array7, 31, z);
uint[] array8 = array6;
SM2P256V1Field.Multiply(z, array7, array8);
SM2P256V1Field.SquareN(z, 32, z);
SM2P256V1Field.Multiply(z, array8, z);
SM2P256V1Field.SquareN(z, 62, z);
SM2P256V1Field.Multiply(z, array8, z);
SM2P256V1Field.SquareN(z, 4, z);
SM2P256V1Field.Multiply(z, array2, z);
SM2P256V1Field.SquareN(z, 32, z);
SM2P256V1Field.Multiply(z, y, z);
SM2P256V1Field.SquareN(z, 62, z);
uint[] array9 = array2;
SM2P256V1Field.Square(z, array9);
if (!Nat256.Eq(y, array9))
return null;
return new SM2P256V1FieldElement(z);
}
public override bool Equals(object obj)
{
return Equals(obj as SM2P256V1FieldElement);
}
public override bool Equals(ECFieldElement other)
{
return Equals(other as SM2P256V1FieldElement);
}
public virtual bool Equals(SM2P256V1FieldElement other)
{
if (this == other)
return true;
if (other == null)
return false;
return Nat256.Eq(x, other.x);
}
public override int GetHashCode()
{
return Q.GetHashCode() ^ Arrays.GetHashCode(x, 0, 8);
}
}
}