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output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Math/EC/ECFieldElement.cs

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+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Math.EC;
+
+public abstract class ECFieldElement
+{
+	public abstract string FieldName { get; }
+
+	public abstract int FieldSize { get; }
+
+	public virtual int BitLength => ToBigInteger().BitLength;
+
+	public virtual bool IsOne => BitLength == 1;
+
+	public virtual bool IsZero => 0 == ToBigInteger().SignValue;
+
+	public abstract BigInteger ToBigInteger();
+
+	public abstract ECFieldElement Add(ECFieldElement b);
+
+	public abstract ECFieldElement AddOne();
+
+	public abstract ECFieldElement Subtract(ECFieldElement b);
+
+	public abstract ECFieldElement Multiply(ECFieldElement b);
+
+	public abstract ECFieldElement Divide(ECFieldElement b);
+
+	public abstract ECFieldElement Negate();
+
+	public abstract ECFieldElement Square();
+
+	public abstract ECFieldElement Invert();
+
+	public abstract ECFieldElement Sqrt();
+
+	public virtual ECFieldElement MultiplyMinusProduct(ECFieldElement b, ECFieldElement x, ECFieldElement y)
+	{
+		return Multiply(b).Subtract(x.Multiply(y));
+	}
+
+	public virtual ECFieldElement MultiplyPlusProduct(ECFieldElement b, ECFieldElement x, ECFieldElement y)
+	{
+		return Multiply(b).Add(x.Multiply(y));
+	}
+
+	public virtual ECFieldElement SquareMinusProduct(ECFieldElement x, ECFieldElement y)
+	{
+		return Square().Subtract(x.Multiply(y));
+	}
+
+	public virtual ECFieldElement SquarePlusProduct(ECFieldElement x, ECFieldElement y)
+	{
+		return Square().Add(x.Multiply(y));
+	}
+
+	public virtual ECFieldElement SquarePow(int pow)
+	{
+		ECFieldElement eCFieldElement = this;
+		for (int i = 0; i < pow; i++)
+		{
+			eCFieldElement = eCFieldElement.Square();
+		}
+		return eCFieldElement;
+	}
+
+	public virtual bool TestBitZero()
+	{
+		return ToBigInteger().TestBit(0);
+	}
+
+	public override bool Equals(object obj)
+	{
+		return Equals(obj as ECFieldElement);
+	}
+
+	public virtual bool Equals(ECFieldElement other)
+	{
+		if (this == other)
+		{
+			return true;
+		}
+		if (other == null)
+		{
+			return false;
+		}
+		return ToBigInteger().Equals(other.ToBigInteger());
+	}
+
+	public override int GetHashCode()
+	{
+		return ToBigInteger().GetHashCode();
+	}
+
+	public override string ToString()
+	{
+		return ToBigInteger().ToString(16);
+	}
+
+	public virtual byte[] GetEncoded()
+	{
+		return BigIntegers.AsUnsignedByteArray((FieldSize + 7) / 8, ToBigInteger());
+	}
+}