Org.BouncyCastle.Crypto.Engines.RijndaelEngine.DecryptBlock C# (CSharp) Method

		private void DecryptBlock(
			long[][] rk)
		{
			int r;

			// To decrypt: apply the inverse operations of the encrypt routine,
			//             in opposite order
			//
			// (KeyAddition is an involution: it 's equal to its inverse)
			// (the inverse of Substitution with table S is Substitution with the inverse table of S)
			// (the inverse of Shiftrow is Shiftrow over a suitable distance)
			//

			// First the special round:
			//   without InvMixColumn
			//   with extra KeyAddition
			//
			KeyAddition(rk[ROUNDS]);
			Substitution(Si);
			ShiftRow(shifts1SC);

			//
			// ROUNDS-1 ordinary rounds
			//
			for (r = ROUNDS-1; r > 0; r--)
			{
				KeyAddition(rk[r]);
				InvMixColumn();
				Substitution(Si);
				ShiftRow(shifts1SC);
			}

			//
			// End with the extra key addition
			//
			KeyAddition(rk[0]);
		}
	}