Net encryption generalized to support more algorithms

Lidgren.Network/Encryption/NetXorEncryption.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Lidgren.Network
+{
+	/// <summary>
+	/// Example class; not very good encryption
+	/// </summary>
+	public class NetXorEncryption : INetEncryption
+	{
+		private byte[] m_key;
+
+		public NetXorEncryption(byte[] key)
+		{
+			m_key = key;
+		}
+
+		public NetXorEncryption(string key)
+		{
+			m_key = Encoding.ASCII.GetBytes(key);
+		}
+
+		public bool Encrypt(NetOutgoingMessage msg)
+		{
+			int numBytes = msg.LengthBytes;
+			for (int i = 0; i < numBytes; i++)
+			{
+				int offset = i % m_key.Length;
+				msg.m_data[i] = (byte)(msg.m_data[i] ^ m_key[offset]);
+			}
+			return true;
+		}
+
+		public bool Decrypt(NetIncomingMessage msg)
+		{
+			int numBytes = msg.LengthBytes;
+			for (int i = 0; i < numBytes; i++)
+			{
+				int offset = i % m_key.Length;
+				msg.m_data[i] = (byte)(msg.m_data[i] ^ m_key[offset]);
+			}
+			return true;
+		}
+	}
+}