private byte[] FormatPacket(ushort opcode, byte[] data, bool encrypted)
{
// Sanity check
if (data.Length >= 0x8000)
{
throw (new Exception("[SecurityAPI::FormatPacket] Payload is too large!"));
}
ushort data_length = (ushort)data.Length;
// Add the packet header to the start of the data
PacketWriter writer = new PacketWriter();
writer.Write(data_length); // packet size
writer.Write(opcode); // packet opcode
writer.Write((ushort)0); // packet security bytes
writer.Write(data);
writer.Flush();
// Determine if we need to mark the packet size as encrypted
if (encrypted && (m_security_flags.blowfish == 1 || (m_security_flags.security_bytes == 1 && m_security_flags.blowfish == 0)))
{
long seek_index = writer.BaseStream.Seek(0, SeekOrigin.Current);
ushort packet_size = (ushort)(data_length | 0x8000);
writer.BaseStream.Seek(0, SeekOrigin.Begin);
writer.Write((ushort)packet_size);
writer.Flush();
writer.BaseStream.Seek(seek_index, SeekOrigin.Begin);
}
// Only need to stamp bytes if this is a clientless object
if (m_client_security == false && m_security_flags.security_bytes == 1)
{
long seek_index = writer.BaseStream.Seek(0, SeekOrigin.Current);
byte sb1 = GenerateCountByte(true);
writer.BaseStream.Seek(4, SeekOrigin.Begin);
writer.Write(sb1);
writer.Flush();
byte sb2 = GenerateCheckByte(writer.GetBytes());
writer.BaseStream.Seek(5, SeekOrigin.Begin);
writer.Write(sb2);
writer.Flush();
writer.BaseStream.Seek(seek_index, SeekOrigin.Begin);
}
// If the packet should be physically encrypted, return an encrypted version of it
if (encrypted && m_security_flags.blowfish == 1)
{
byte[] raw_data = writer.GetBytes();
byte[] encrypted_data = m_blowfish.Encode(raw_data, 2, raw_data.Length - 2);
writer.BaseStream.Seek(2, SeekOrigin.Begin);
writer.Write(encrypted_data);
writer.Flush();
}
else
{
// Determine if we need to unmark the packet size from being encrypted but not physically encrypted
if (encrypted && (m_security_flags.security_bytes == 1 && m_security_flags.blowfish == 0))
{
long seek_index = writer.BaseStream.Seek(0, SeekOrigin.Current);
writer.BaseStream.Seek(0, SeekOrigin.Begin);
writer.Write((ushort)data_length);
writer.Flush();
writer.BaseStream.Seek(seek_index, SeekOrigin.Begin);
}
}
// Return the final data
return writer.GetBytes();
}
public void ProtocolVersionTestMethod()
{
byte[] _result = null;
using (MemoryStream _stream = new MemoryStream())
using (PacketWriter _writer = new PacketWriter(_stream))
{
PacketHeader _header = PacketHeader.GetProducerPacketHeader(_writer, CommonDefinitions.TestGuid, new UInt16[] { CommonDefinitions.DataSetId });
Assert.IsNotNull(_header);
Assert.AreEqual<Byte>(110, _header.ProtocolVersion);
Assert.AreEqual<Guid>(CommonDefinitions.TestGuid, _header.PublisherId);
_header.NetworkMessageFlags = 0;
_header.SecurityTokenId = 0;
_header.NonceLength = 1;
_header.Nonce = new byte[] { 0xcc };
_header.WritePacketHeader();
_writer.Flush();
_result = _stream.ToArray();
}
byte[] _expected = new ArraySegment<byte>(CommonDefinitions.GetTestBinaryArrayVariant(), 0, 27).ToArray<byte>();
CollectionAssert.AreEqual(_expected, _result);
}
