private void OnRecvOpcodeEncryptPacket(OpcodeEncryptedEventArgs e)
{
EventHandler <OpcodeEncryptedEventArgs> handler = RecvOpcodeEncryptPacket;
handler?.Invoke(this, e);
}
private void MapleStream_RecvOpcodeEncryptPacket(object sender, OpcodeEncryptedEventArgs e)
{
mOutboundStream.OpcodeEncrypted = e.OpcodeEncrypted;
mOutboundStream.EncryptedOpcodes = e.EncryptedOpcodes;
}
public MaplePacket Read(DateTime pTransmitted)
{
if (mCursor < _expectedDataSize)
{
return(null);
}
if (!mAES.ConfirmHeader(mBuffer, 0))
{
throw new Exception("Failed to confirm packet header");
}
int headerLength = MapleAES.GetHeaderLength(mBuffer, mCursor, _usesOldHeader);
_expectedDataSize = headerLength;
if (mCursor < headerLength)
{
return(null);
}
int packetSize = MapleAES.GetPacketLength(mBuffer, mCursor, _usesOldHeader);
_expectedDataSize = packetSize + headerLength;
if (mCursor < (packetSize + headerLength))
{
return(null);
}
byte[] packetBuffer = new byte[packetSize];
Buffer.BlockCopy(mBuffer, headerLength, packetBuffer, 0, packetSize);
var preDecodeIV = BitConverter.ToUInt32(mAES.mIV, 0);
Decrypt(packetBuffer, _transformMethod);
var postDecodeIV = BitConverter.ToUInt32(mAES.mIV, 0);
mCursor -= _expectedDataSize;
if (mCursor > 0)
{
Buffer.BlockCopy(mBuffer, _expectedDataSize, mBuffer, 0, mCursor);
}
ushort opcode;
if (_usesByteHeader)
{
opcode = (ushort)(packetBuffer[0]);
Buffer.BlockCopy(packetBuffer, 1, packetBuffer, 0, packetSize - 1);
Array.Resize(ref packetBuffer, packetSize - 1);
}
else
{
opcode = (ushort)(packetBuffer[0] | (packetBuffer[1] << 8));
Buffer.BlockCopy(packetBuffer, 2, packetBuffer, 0, packetSize - 2);
Array.Resize(ref packetBuffer, packetSize - 2);
}
_expectedDataSize = 4;
Definition definition = null;
// Detect OpcodeEncryption Packet
if (packetBuffer.Length == (8 + 1 + short.MaxValue)) // 32776
{
int blockSize = BitConverter.ToInt32(packetBuffer, 0);
int bufferSize = BitConverter.ToInt32(packetBuffer, 4);
if (blockSize == 4 && bufferSize == (1 + short.MaxValue))
{
Console.WriteLine("Recv OpcodeEncryption Packet with Opcode:0x{0:X} | BlockSize:{1} | BufferSize:{2}", opcode, blockSize, bufferSize);
OpcodeEncryptedEventArgs recvOpcodeEventArgs = new OpcodeEncryptedEventArgs();
recvOpcodeEventArgs.OpcodeEncrypted = true;
recvOpcodeEventArgs.EncryptedOpcodes = PopulateEncryptedOpcode(packetBuffer, bufferSize);
OnRecvOpcodeEncryptPacket(recvOpcodeEventArgs);
// Generate OpcodeEncryption packet
{
definition = Config.Instance.GetDefinition(Build, Locale, mOutbound, opcode);
if (definition == null)
{
definition = new Definition();
definition.Outbound = mOutbound;
definition.Locale = Locale;
definition.Opcode = opcode;
definition.Name = "Opcode Encryption";
definition.Build = Build;
DefinitionsContainer.Instance.SaveDefinition(definition);
}
var filename = Helpers.GetScriptPath(Locale, Build, mOutbound, opcode);
Helpers.MakeSureFileDirectoryExists(filename);
// Create main script
if (!File.Exists(filename))
{
string contents = @"
using (ScriptAPI) {
AddInt(""Block Size"");
AddInt(""Buffer Size"");
AddByte(""Unknown"");
AddField(""Buffer With Encrypted Opcodes"", 32767);
}
";
File.WriteAllText(filename, contents);
}
}
}
}
// Get the real opcode
if (OpcodeEncrypted && mOutbound && EncryptedOpcodes != null && EncryptedOpcodes.ContainsKey(opcode))
{
opcode = EncryptedOpcodes[opcode].RealOp;
}
definition = Config.Instance.GetDefinition(Build, Locale, mOutbound, opcode);
return(new MaplePacket(pTransmitted, mOutbound, Build, Locale, opcode, definition == null ? "" : definition.Name, packetBuffer, preDecodeIV, postDecodeIV));
}
