Initial Commit

iTechSharp/srcbc/math/ec/multiplier/ReferenceMultiplier.cs

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+namespace Org.BouncyCastle.Math.EC.Multiplier
+{
+	internal class ReferenceMultiplier
+		: ECMultiplier
+	{
+		/**
+		* Simple shift-and-add multiplication. Serves as reference implementation
+		* to verify (possibly faster) implementations in
+		* {@link org.bouncycastle.math.ec.ECPoint ECPoint}.
+		* 
+		* @param p The point to multiply.
+		* @param k The factor by which to multiply.
+		* @return The result of the point multiplication <code>k * p</code>.
+		*/
+		public ECPoint Multiply(ECPoint p, BigInteger k, PreCompInfo preCompInfo)
+		{
+			ECPoint q = p.Curve.Infinity;
+			int t = k.BitLength;
+			for (int i = 0; i < t; i++)
+			{
+				if (k.TestBit(i))
+				{
+					q = q.Add(p);
+				}
+				p = p.Twice();
+			}
+			return q;
+		}
+	}
+}