/// <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 {
KeySize = 256, //in bits
Key = key,
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)
{
Helpers.ErrorLogger.Log(Helpers.ErrorLevel.Critical, "Error disposing AES streams" + e);
//Console.WriteLine("Error disposing AES streams" + e);
}
return(data);
}
/// <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)
{
var crypto = new AesManaged
{
KeySize = 256,
Key = key,
Mode = CipherMode.ECB // Should be OFB, but this works too
};
using (var memStream = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(memStream, crypto.CreateEncryptor(), CryptoStreamMode.Write))
{
var remaining = length;
var size = 0x5B0;
var start = 0;
while (remaining > 0)
{
var myIv = MapleCrypto.MultiplyBytes(iv, 4, 4);
if (remaining < size)
{
size = remaining;
}
for (var x = start; x < start + size; x++)
{
if ((x - start) % myIv.Length == 0)
{
cryptoStream.Write(myIv, 0, myIv.Length);
var newIv = memStream.ToArray();
Array.Copy(newIv, myIv, myIv.Length);
memStream.Position = 0;
}
data[x] ^= myIv[(x - start) % myIv.Length];
}
start += size;
remaining -= size;
size = 0x5B4;
}
}
}
return(data);
}
/// <summary>
/// Encrypt data using MapleStory's AES method
/// </summary>
/// <param name="pIV">IV to use for encryption</param>
/// <param name="pData">data to encrypt</param>
/// <param name="pLength">length of data</param>
/// <param name="pKey">the AES key to use</param>
/// <returns>Crypted data</returns>
public static byte[] aesCrypt(byte[] pIV, byte[] pData, int pLength, byte[] pKey)
{
AesManaged crypto = new AesManaged {
KeySize = 256, Key = pKey, Mode = CipherMode.ECB
};
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, crypto.CreateEncryptor(), CryptoStreamMode.Write);
int remaining = pLength;
int llength = 0x5B0;
int start = 0;
while (remaining > 0)
{
byte[] myIV = MapleCrypto.multiplyBytes(pIV, 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;
}
pData[x] ^= myIV[(x - start) % myIV.Length];
}
start += llength;
remaining -= llength;
llength = 0x5B4;
}
try {
cryptoStream.Dispose();
memStream.Dispose();
} catch (Exception e) {
Console.WriteLine("Error disposing AES streams" + e);
}
return(pData);
}
/// <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
{
KeySize = 256, //in bits
Key = key,
Mode = CipherMode.ECB // Should be OFB, but this works too
};
using (MemoryStream memStream = new MemoryStream())
{
using (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;
}
}
}
return(data);
}
/// <summary>
/// Data received event handler
/// </summary>
/// <param name="iar">IAsyncResult of the data received event</param>
private void OnDataReceived(IAsyncResult iar)
{
SocketInfo socketInfo = (SocketInfo)iar.AsyncState;
try
{
int received = socketInfo.Socket.EndReceive(iar);
if (received == 0)
{
if (OnClientDisconnected != null)
{
OnClientDisconnected(this);
}
return;
}
socketInfo.Index += received;
if (socketInfo.Index == socketInfo.DataBuffer.Length)
{
switch (socketInfo.State)
{
case SocketInfo.StateEnum.Header:
if (socketInfo.NoEncryption)
{
PacketReader headerReader = new PacketReader(socketInfo.DataBuffer);
short packetHeader = headerReader.ReadShort();
socketInfo.State = SocketInfo.StateEnum.Content;
socketInfo.DataBuffer = new byte[packetHeader];
socketInfo.Index = 0;
WaitForData(socketInfo);
}
else
{
PacketReader headerReader = new PacketReader(socketInfo.DataBuffer);
byte[] packetHeaderB = headerReader.ToArray();
int packetHeader = headerReader.ReadInt();
short packetLength = (short)MapleCrypto.getPacketLength(packetHeader);
if (_type == SessionType.SERVER_TO_CLIENT && !_RIV.checkPacketToServer(BitConverter.GetBytes(packetHeader)))
{
Helpers.ErrorLogger.Log(Helpers.ErrorLevel.Critical, "[Error] Packet check failed. Disconnecting client.");
//this.Socket.Close();
}
socketInfo.State = SocketInfo.StateEnum.Content;
socketInfo.DataBuffer = new byte[packetLength];
socketInfo.Index = 0;
WaitForData(socketInfo);
}
break;
case SocketInfo.StateEnum.Content:
byte[] data = socketInfo.DataBuffer;
if (socketInfo.NoEncryption)
{
socketInfo.NoEncryption = false;
PacketReader reader = new PacketReader(data);
short version = reader.ReadShort();
string unknown = reader.ReadMapleString();
_SIV = new MapleCrypto(reader.ReadBytes(4), version);
_RIV = new MapleCrypto(reader.ReadBytes(4), version);
byte serverType = reader.ReadByte();
if (_type == SessionType.CLIENT_TO_SERVER)
{
OnInitPacketReceived(version, serverType);
}
OnPacketReceived(new PacketReader(data), true);
WaitForData();
}
else
{
_RIV.crypt(data);
MapleCustomEncryption.Decrypt(data);
if (data.Length != 0 && OnPacketReceived != null)
{
OnPacketReceived(new PacketReader(data), false);
}
WaitForData();
}
break;
}
}
else
{
Helpers.ErrorLogger.Log(Helpers.ErrorLevel.Critical, "[Warning] Not enough data");
WaitForData(socketInfo);
}
}
catch (ObjectDisposedException)
{
Helpers.ErrorLogger.Log(Helpers.ErrorLevel.Critical, "[Error] Session.OnDataReceived: Socket has been closed");
}
catch (SocketException se)
{
if (se.ErrorCode != 10054)
{
Helpers.ErrorLogger.Log(Helpers.ErrorLevel.Critical, "[Error] Session.OnDataReceived: " + se);
}
}
catch (Exception e)
{
Helpers.ErrorLogger.Log(Helpers.ErrorLevel.Critical, "[Error] Session.OnDataReceived: " + e);
}
}
