Add() public method

public Add ( NetBigInteger value ) : NetBigInteger
value NetBigInteger
return NetBigInteger
NetBigInteger Class Documentation
Example #1
0
		public NetBigInteger And(
			NetBigInteger value)
		{
			if (m_sign == 0 || value.m_sign == 0)
			{
				return Zero;
			}

			int[] aMag = m_sign > 0
				? m_magnitude
				: Add(One).m_magnitude;

			int[] bMag = value.m_sign > 0
				? value.m_magnitude
				: value.Add(One).m_magnitude;

			bool resultNeg = m_sign < 0 && value.m_sign < 0;
			int resultLength = System.Math.Max(aMag.Length, bMag.Length);
			int[] resultMag = new int[resultLength];

			int aStart = resultMag.Length - aMag.Length;
			int bStart = resultMag.Length - bMag.Length;

			for (int i = 0; i < resultMag.Length; ++i)
			{
				int aWord = i >= aStart ? aMag[i - aStart] : 0;
				int bWord = i >= bStart ? bMag[i - bStart] : 0;

				if (m_sign < 0)
				{
					aWord = ~aWord;
				}

				if (value.m_sign < 0)
				{
					bWord = ~bWord;
				}

				resultMag[i] = aWord & bWord;

				if (resultNeg)
				{
					resultMag[i] = ~resultMag[i];
				}
			}

			NetBigInteger result = new NetBigInteger(1, resultMag, true);

			if (resultNeg)
			{
				result = result.Not();
			}

			return result;
		}
Example #2
0
		/// <summary>
		/// Computes the client session value
		/// </summary>
		public static byte[] ComputeClientSessionValue(byte[] serverPublicEphemeral, byte[] xdata,  byte[] udata, byte[] clientPrivateEphemeral)
		{
			// (B - kg^x) ^ (a + ux)   (mod N)
			var B = new NetBigInteger(NetUtility.ToHexString(serverPublicEphemeral), 16);
			var x = new NetBigInteger(NetUtility.ToHexString(xdata), 16);
			var u = new NetBigInteger(NetUtility.ToHexString(udata), 16);
			var a = new NetBigInteger(NetUtility.ToHexString(clientPrivateEphemeral), 16);

			var bx = g.ModPow(x, N);
			var btmp = B.Add(N.Multiply(k)).Subtract(bx.Multiply(k)).Mod(N);
			return btmp.ModPow(x.Multiply(u).Add(a), N).ToByteArrayUnsigned();
		}