public static InitializationPacket ReadFrom(ArraySegment <byte> segment)
{
if (segment.Count < NoDataSize)
{
throw new InvalidPacketSizeException(segment,
$"Data is too small, expected {NoDataSize} bytes but provided only {segment.Count}");
}
var result = new InitializationPacket();
using (var stream = new MemoryStream(segment.Array, segment.Offset, segment.Count))
{
var reader = new EndianReader(stream, Endianness.BigEndian);
result.ChannelIdentifier = reader.ReadUInt32();
result.CommandIdentifier = reader.ReadByte();
CheckCommand(segment, result.CommandIdentifier);
var payloadLengthHi = reader.ReadByte();
var payloadLengthLo = reader.ReadByte();
result.PayloadLength = (ushort)(payloadLengthHi << 8 | payloadLengthLo);
}
var remainingBytes = Math.Min(segment.Count - NoDataSize, result.PayloadLength);
result.Data = new ArraySegment <byte>(segment.Array, segment.Offset + NoDataSize,
remainingBytes);
return(result);
}
public static InitializationPacket ReadFrom(ArraySegment<byte> segment)
{
if (segment.Count < NoDataSize)
{
throw new InvalidPacketSizeException(segment,
$"Data is too small, expected {NoDataSize} bytes but provided only {segment.Count}");
}
var result = new InitializationPacket();
using (var stream = new MemoryStream(segment.Array, segment.Offset, segment.Count))
{
var reader = new EndianReader(stream, Endianness.BigEndian);
result.ChannelIdentifier = reader.ReadUInt32();
result.CommandIdentifier = reader.ReadByte();
CheckCommand(segment, result.CommandIdentifier);
var payloadLengthHi = reader.ReadByte();
var payloadLengthLo = reader.ReadByte();
result.PayloadLength = (ushort)(payloadLengthHi << 8 | payloadLengthLo);
}
var remainingBytes = Math.Min(segment.Count - NoDataSize, result.PayloadLength);
result.Data = new ArraySegment<byte>(segment.Array, segment.Offset + NoDataSize,
remainingBytes);
return result;
}
static FidoU2FHidMessage BuildMessage(InitializationPacket init, List<ContinuationPacket> continuations)
{
ArraySegment<byte> data;
if (continuations.Count > 0)
{
// We must allocate memory to reconstruct the message
var stream = new MemoryStream(init.PayloadLength);
stream.Write(init.Data.Array, init.Data.Offset, init.Data.Count);
foreach (var continuation in continuations)
{
stream.Write(continuation.Data.Array, continuation.Data.Offset, continuation.Data.Count);
}
data = stream.ToArray().Segment();
}
else
{
// No need to reconstruct the message
data = init.Data;
}
return new FidoU2FHidMessage(init.ChannelIdentifier, (U2FHidCommand)init.CommandIdentifier, data);
}
static Tuple<InitializationPacket, List<ContinuationPacket>> MakeOutputPackets(
int paketLength, FidoU2FHidMessage message)
{
var availableInInit = paketLength - InitializationPacket.NoDataSize;
var availableInContinuation = paketLength - ContinuationPacket.NoDataSize;
var data = message.Data;
var init = new InitializationPacket
{
ChannelIdentifier = message.Channel,
CommandIdentifier = (byte)message.Command,
PayloadLength = (ushort)data.Count,
Data = new ArraySegment<byte>(data.Array, data.Offset,
Math.Min(data.Count, availableInInit))
};
var sizeHandled = init.Data.Count;
var continuations = new List<ContinuationPacket>();
byte sequence = 0;
while (sizeHandled < data.Count)
{
var continuation = new ContinuationPacket
{
ChannelIdentifier = message.Channel,
PaketSequence = sequence,
Data = new ArraySegment<byte>(data.Array, data.Offset + sizeHandled,
Math.Min(data.Count - sizeHandled, availableInContinuation))
};
continuations.Add(continuation);
sizeHandled += continuation.Data.Count;
sequence += 1;
}
return Tuple.Create(init, continuations);
}
static unsafe void Test(Win32HidDevice device)
{
var init = new InitializationPacket();
init.CommandIdentifier = (byte)U2FHidCommand.Init;
init.ChannelIdentifier = U2FHID_BROADCAST_CID;
init.PayloadLength = 8;
var caps = device.Information.Capabilities;
var buffer = new byte[caps.InputReportByteLength];
fixed (byte* pBuffer = buffer)
{
Marshal.StructureToPtr(init, new IntPtr(pBuffer + 1), false);
buffer[0] = 0x00;
buffer[8] = 0xCA;
buffer[9] = 0xFE;
buffer[10] = 0xBA;
buffer[11] = 0xBE;
buffer[12] = 0xDE;
buffer[13] = 0xAD;
buffer[14] = 0xBA;
buffer[15] = 0xBE;
WriteBuffer(buffer);
var task = Kernel32Dll.WriteFileAsync(device.Handle, new IntPtr(pBuffer), buffer.Length);
var writen = task.Result;
Console.WriteLine("Writen {0} bytes", writen);
}
var bufferOut = new byte[caps.OutputReportByteLength];
fixed (byte* pBuffer = bufferOut)
{
var intPtr = new IntPtr(pBuffer);
var task = Kernel32Dll.ReadFileAsync(device.Handle, intPtr, bufferOut.Length);
var read = task.Result;
Console.WriteLine("Read {0} bytes", read);
}
WriteBuffer(bufferOut);
Wink(device, bufferOut[16], bufferOut[17], bufferOut[18], bufferOut[19]);
}