init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Math/EC/AbstractF2mFieldElement.cs

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+using System;
+
+namespace Org.BouncyCastle.Math.EC;
+
+public abstract class AbstractF2mFieldElement : ECFieldElement
+{
+	public virtual ECFieldElement HalfTrace()
+	{
+		int fieldSize = FieldSize;
+		if ((fieldSize & 1) == 0)
+		{
+			throw new InvalidOperationException("Half-trace only defined for odd m");
+		}
+		ECFieldElement eCFieldElement = this;
+		ECFieldElement eCFieldElement2 = eCFieldElement;
+		for (int i = 2; i < fieldSize; i += 2)
+		{
+			eCFieldElement = eCFieldElement.SquarePow(2);
+			eCFieldElement2 = eCFieldElement2.Add(eCFieldElement);
+		}
+		return eCFieldElement2;
+	}
+
+	public virtual int Trace()
+	{
+		int fieldSize = FieldSize;
+		ECFieldElement eCFieldElement = this;
+		ECFieldElement eCFieldElement2 = eCFieldElement;
+		for (int i = 1; i < fieldSize; i++)
+		{
+			eCFieldElement = eCFieldElement.Square();
+			eCFieldElement2 = eCFieldElement2.Add(eCFieldElement);
+		}
+		if (eCFieldElement2.IsZero)
+		{
+			return 0;
+		}
+		if (eCFieldElement2.IsOne)
+		{
+			return 1;
+		}
+		throw new InvalidOperationException("Internal error in trace calculation");
+	}
+}