Progress on tutorial, gap tweaking (water flows faster from room to room), UPnP error messages, input keys in array, underwater aiming tweaking, tons of misc stuff commit more often ffs

Lidgren.Network/Encryption/NetAESEncryption.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Lidgren.Network
+{
+	/// <summary>
+	/// AES encryption
+	/// </summary>
+	public class NetAESEncryption : INetEncryption
+	{
+		private readonly byte[] m_key;
+		private readonly byte[] m_iv;
+		private readonly int m_bitSize;
+		private static readonly List<int> m_keysizes;
+		private static readonly List<int> m_blocksizes;
+
+		static NetAESEncryption()
+		{
+#if !IOS && !__ANDROID__
+			AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
+			List<int> temp = new List<int>();
+			foreach (KeySizes keysize in aes.LegalKeySizes)
+			{
+				for (int i = keysize.MinSize; i <= keysize.MaxSize; i += keysize.SkipSize)
+				{
+					if (!temp.Contains(i))
+						temp.Add(i);
+					if (i == keysize.MaxSize)
+						break;
+				}
+			}
+			m_keysizes = temp;
+			temp = new List<int>();
+			foreach (KeySizes keysize in aes.LegalBlockSizes)
+			{
+				for (int i = keysize.MinSize; i <= keysize.MaxSize; i += keysize.SkipSize)
+				{
+
+					if (!temp.Contains(i))
+						temp.Add(i);
+					if (i == keysize.MaxSize)
+						break;
+				}
+			}
+			m_blocksizes = temp;
+#endif
+		}
+
+		/// <summary>
+		/// NetAESEncryption constructor
+		/// </summary>
+		public NetAESEncryption(byte[] key, byte[] iv)
+		{
+			if (!m_keysizes.Contains(key.Length * 8))
+				throw new NetException(string.Format("Not a valid key size. (Valid values are: {0})", NetUtility.MakeCommaDelimitedList(m_keysizes)));
+
+			if (!m_blocksizes.Contains(iv.Length * 8))
+				throw new NetException(string.Format("Not a valid iv size. (Valid values are: {0})", NetUtility.MakeCommaDelimitedList(m_blocksizes)));
+
+			m_key = key;
+			m_iv = iv;
+			m_bitSize = m_key.Length * 8;
+		}
+
+		/// <summary>
+		/// NetAESEncryption constructor
+		/// </summary>
+		public NetAESEncryption(string key, int bitsize)
+		{
+			if (!m_keysizes.Contains(bitsize))
+				throw new NetException(string.Format("Not a valid key size. (Valid values are: {0})", NetUtility.MakeCommaDelimitedList(m_keysizes)));
+
+			byte[] entropy = Encoding.UTF32.GetBytes(key);
+			// I know hardcoding salts is bad, but in this case I think it is acceptable.
+			HMACSHA512 hmacsha512 = new HMACSHA512(Convert.FromBase64String("i88NEiez3c50bHqr3YGasDc4p8jRrxJAaiRiqixpvp4XNAStP5YNoC2fXnWkURtkha6M8yY901Gj07IRVIRyGL=="));
+			hmacsha512.Initialize();
+			for (int i = 0; i < 1000; i++)
+			{
+				entropy = hmacsha512.ComputeHash(entropy);
+			}
+			int keylen = bitsize / 8;
+			m_key = new byte[keylen];
+			Buffer.BlockCopy(entropy, 0, m_key, 0, keylen);
+			m_iv = new byte[m_blocksizes[0] / 8];
+
+			Buffer.BlockCopy(entropy, entropy.Length - m_iv.Length - 1, m_iv, 0, m_iv.Length);
+			m_bitSize = bitsize;
+		}
+
+		/// <summary>
+		/// NetAESEncryption constructor
+		/// </summary>
+		public NetAESEncryption(string key)
+			: this(key, m_keysizes[0])
+		{
+		}
+
+		/// <summary>
+		/// Encrypt outgoing message
+		/// </summary>
+		public bool Encrypt(NetOutgoingMessage msg)
+		{
+#if !IOS && !__ANDROID__
+			try
+			{
+				// nested usings are fun!
+				using (AesCryptoServiceProvider aesCryptoServiceProvider = new AesCryptoServiceProvider { KeySize = m_bitSize, Mode = CipherMode.CBC })
+				{
+					using (ICryptoTransform cryptoTransform = aesCryptoServiceProvider.CreateEncryptor(m_key, m_iv))
+					{
+						using (MemoryStream memoryStream = new MemoryStream())
+						{
+							using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Write))
+							{
+								cryptoStream.Write(msg.m_data, 0, msg.m_data.Length);
+							}
+							msg.m_data = memoryStream.ToArray();
+						}
+					}
+				}
+
+			}
+			catch
+			{
+				return false;
+			}
+			return true;
+#else
+			return false;
+#endif
+		}
+
+		/// <summary>
+		/// Decrypt incoming message
+		/// </summary>
+		public bool Decrypt(NetIncomingMessage msg)
+		{
+#if !IOS && !__ANDROID__
+			try
+			{
+				// nested usings are fun!
+				using (AesCryptoServiceProvider aesCryptoServiceProvider = new AesCryptoServiceProvider { KeySize = m_bitSize, Mode = CipherMode.CBC })
+				{
+					using (ICryptoTransform cryptoTransform = aesCryptoServiceProvider.CreateDecryptor(m_key, m_iv))
+					{
+						using (MemoryStream memoryStream = new MemoryStream())
+						{
+							using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform,
+																			 CryptoStreamMode.Write))
+							{
+								cryptoStream.Write(msg.m_data, 0, msg.m_data.Length);
+							}
+							msg.m_data = memoryStream.ToArray();
+						}
+					}
+				}
+
+			}
+			catch
+			{
+				return false;
+			}
+			return true;
+#else
+			return false;
+#endif
+		}
+	}
+}