private byte[] DecryptPacket(SOEClient sender, byte[] packet)
{
// Compressable?
if (!sender.IsEncrypted())
{
return packet;
}
// Setup our streams
SOEReader reader = new SOEReader(packet);
SOEWriter newPacket = new SOEWriter(reader.ReadUInt16());
// Skip the compression flag
reader.ReadByte();
// Get our data
int blockCount = (packet.Length - 3) / 4;
int byteCount = (packet.Length - 3) % 4;
uint key = sender.GetCRCSeed();
// Decrypt the blocks of 4 bytes
for (int i = 0; i < blockCount; i++)
{
uint temp = reader.ReadUInt32();
uint value = temp ^ key;
key = temp;
newPacket.AddUInt32(value);
}
// Decrypt the rest of the singular bytes
byte newKey = (byte)((key >> 24) & 0xFF);
for (int i = 0; i < byteCount; i++)
{
byte value = (byte)(reader.ReadByte() ^ newKey);
newPacket.AddByte(value);
}
// Return the decrypted packet
return newPacket.GetRaw();
}
public void HandleSessionRequest(SOEClient sender, SOEPacket packet)
{
// Setup a reader
SOEReader reader = new SOEReader(packet);
// Get the data from the packet
uint crcLength = reader.ReadUInt32();
uint sessionID = reader.ReadUInt32();
uint udpBufferSize = reader.ReadUInt32();
string protocol = reader.ReadNullTerminatedString();
// Is the client using the correct protocol?
if (ProtocolString == protocol)
{
// Can we encrypt/compress?
bool encryptable = false;
bool compressable = true;
// Start the session and manage the client
sender.StartSession(crcLength, sessionID, udpBufferSize);
sender.SetCompressable(compressable);
sender.SetEncryptable(encryptable);
Server.ConnectionManager.AddNewClient(sender);
// Setup a writer
SOEWriter writer = new SOEWriter((ushort)SOEOPCodes.SESSION_RESPONSE);
// Write a response
writer.AddUInt32(sessionID);
writer.AddUInt32(sender.GetCRCSeed());
writer.AddByte((byte)crcLength);
writer.AddBoolean(compressable);
writer.AddBoolean(encryptable);
writer.AddUInt32(udpBufferSize);
writer.AddUInt32(3);
// Get the response
SOEPacket response = writer.GetFinalSOEPacket(sender, false, false);
// Send the response!
sender.SendPacket(response);
}
else
{
// They aren't using the right protocol...
Log("Got connection request from client with incorrect protocol. Client: {0}, Server: {1}", protocol, ProtocolString);
}
}
public byte[] Encrypt(SOEClient client, byte[] data)
{
SOEReader reader = new SOEReader(data);
SOEWriter newPacket = new SOEWriter();
int blockCount = data.Length / 4;
int byteCount = data.Length % 4;
uint key = client.GetCRCSeed();
// Encrypt the blocks of 4 bytes
for (int i = 0; i < blockCount; i++)
{
uint value = key = reader.ReadUInt32() ^ key;
newPacket.AddUInt32(value);
}
// Encrypt the rest of the singular bytes
byte newKey = (byte)((key >> 24) & 0xFF);
for (int i = 0; i < byteCount; i++)
{
byte value = (byte)(reader.ReadByte() ^ newKey);
newPacket.AddByte(value);
}
// Return the encrypted packet
return newPacket.GetRaw();
}
