/// <summary>
/// Creates a new instance of a Session
/// </summary>
/// <param name="socket"> Socket connection of the session </param>
/// <param name="recv"> Recive crypto of the session </param>
/// <param name="send"> Send crypto of the session </param>
public Session(Socket socket, MapleCrypto recv, MapleCrypto send)
{
this.Socket = socket;
this.ReceiveCrypto = recv;
this.SendCrypto = send;
this.Client = new MapleClient(this);
}
/// <summary>
/// Encrypt data using MapleStory's AES method
/// </summary>
/// <param name="IV"> IV to use for encryption </param>
/// <param name="data"> data to encrypt </param>
/// <param name="length"> length of data </param>
/// <param name="key"> the AES key to use </param>
/// <returns> Crypted data </returns>
public static byte[] AESCrypt(byte[] IV, byte[] data, int length, byte[] key)
{
AesManaged crypto = new AesManaged();
crypto.KeySize = 256; //in bits
crypto.Key = key;
crypto.Mode = CipherMode.ECB; // Should be OFB, but this works too
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, crypto.CreateEncryptor(), CryptoStreamMode.Write);
int remaining = length;
int llength = 0x5B0;
int start = 0;
while (remaining > 0)
{
byte[] myIV = MapleCrypto.MultiplyBytes(IV, 4, 4);
if (remaining < llength)
{
llength = remaining;
}
for (int x = start; x < (start + llength); x++)
{
if ((x - start) % myIV.Length == 0)
{
cryptoStream.Write(myIV, 0, myIV.Length);
byte[] newIV = memStream.ToArray();
Array.Copy(newIV, myIV, myIV.Length);
memStream.Position = 0;
}
data[x] ^= myIV[(x - start) % myIV.Length];
}
start += llength;
remaining -= llength;
llength = 0x5B4;
}
try
{
cryptoStream.Dispose();
memStream.Dispose();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine(e.StackTrace);
}
return(data);
}
/// <summary>
/// Client connected handler
/// </summary>
/// <param name="iar"> The IAsyncResult </param>
private void OnClientConnect(IAsyncResult iar)
{
try
{
Socket socket = Listener.EndAccept(iar);
byte[] ivRecv = {70, 114, 122, 82};
byte[] ivSend = {82, 48, 120, 115};
MapleCrypto recvCrypto = new MapleCrypto(ivRecv);
MapleCrypto sendCrypto = new MapleCrypto(ivSend);
Session session = new Session(socket, recvCrypto, sendCrypto);
session.Begin(ivRecv, ivSend);
Listener.BeginAccept(OnClientConnect, null);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine(e.StackTrace);
}
}
