public Packet RecvPacket(ICryptoTransform decryptor) { if (decryptor == null) { Packet packet = new Packet(); uint packet_length = reader.ReadUInt32(); byte padding_length = reader.ReadByte(); byte[] payload = reader.ReadBytes(packet_length - padding_length - 1); byte[] padding = reader.ReadBytes(padding_length); packet.SetPayload(payload); return packet; } else { int blocksize = Math.Max(decryptor.InputBlockSize, 8); MemoryStream ms_packet = new MemoryStream(); NetworkByteWriter writer_packet = new NetworkByteWriter(ms_packet); byte[] buffer = new byte[blocksize]; bool first = true; int more = 0; while (true) { // read a block int ret = reader.ReadBytes(buffer, 0, blocksize); // must be a real block size; if (ret != blocksize) return null; decryptor.TransformBlock(buffer, 0, buffer.Length, buffer, 0); writer_packet.WriteBytes(buffer); if (first) // it's first time, need parse packet_length and padding_length { NetworkByteReader reader_buffer = new NetworkByteReader(new MemoryStream(buffer)); uint packet_length_t = reader_buffer.ReadUInt32(); first = false; more = (int)packet_length_t + 4 - blocksize; if (more % blocksize != 0) return null; } else { more -= blocksize; } if (more <= 0) break; } byte[] mac = reader.ReadBytes(20); ms_packet.Seek(0, SeekOrigin.Begin); NetworkByteReader reader_packet = new NetworkByteReader(ms_packet); Packet packet = new Packet(); uint packet_length = reader_packet.ReadUInt32(); byte padding_length = reader_packet.ReadByte(); byte[] payload = reader_packet.ReadBytes(packet_length - padding_length - 1); byte[] padding = reader_packet.ReadBytes(padding_length); packet.SetPayload(payload); return packet; } }
public void SendPacket(ICryptoTransform encryptor, Packet packet) { byte[] payload = packet.GetPayload(); int blocksize = 16; if (encryptor == null) { uint size = (uint)payload.Length; size += 5; size = (uint)((size + blocksize) / blocksize * blocksize); uint packet_length = size - 4; byte padding_length = (byte)(size - 5 - payload.Length); MemoryStream ms = new MemoryStream(); NetworkByteWriter nbw = new NetworkByteWriter(ms); nbw.WriteUInt32(packet_length); nbw.WriteByte(padding_length); nbw.WriteBytes(payload); for (int i = 0; i < padding_length; i++ ) nbw.WriteByte(0x0C); nbw.Flush(); writer.WriteBytes(ms.ToArray()); writer.Flush(); } else { blocksize = Math.Max(encryptor.InputBlockSize, blocksize); uint size = (uint)payload.Length; size += (5 + (uint)encryptor.InputBlockSize); size = (uint)((size + blocksize) / blocksize * blocksize); uint packet_length = size - 4; byte padding_length = (byte)(size - 5 - payload.Length); MemoryStream ms = new MemoryStream(); NetworkByteWriter nbw = new NetworkByteWriter(ms); nbw.WriteUInt32(packet_length); nbw.WriteByte(padding_length); nbw.WriteBytes(payload); for (int i = 0; i < padding_length; i++) nbw.WriteByte(0x0C); nbw.Flush(); // compute mac byte[] cache = ms.ToArray(); MemoryStream ms_mac = new MemoryStream(); NetworkByteWriter nbw_mac = new NetworkByteWriter(ms_mac); nbw_mac.WriteUInt32((uint)sequence); nbw_mac.WriteBytes(cache); nbw_mac.Flush(); byte[] mac = crypto_mac_encryptor.ComputeHash(ms_mac.ToArray()); crypto_encryptor.TransformBlock(cache, 0, cache.Length, cache, 0); writer.WriteBytes(cache); writer.Flush(); if (crypto_mac_encryptor != null) { writer.WriteBytes(mac); } } sequence++; }
public void DumpError(Packet packet) { MemoryStream ms = new MemoryStream(packet.GetPayload()); NetworkByteReader nbr = new NetworkByteReader(ms); nbr.ReadByte(); nbr.ReadUInt32(); string xxx = nbr.ReadString(); }
public PacketChannelData(Packet p) : base(p) { }
public Packet(Packet p) { SetPayload(p.GetPayload()); }
public PacketKeyExchangeDHReply(Packet p) : base(p) { }
public PacketKeyExchange(Packet p) : base(p) { }