private async Task SendRequestAsync(FidoHidMsgType msgType, byte[] data = null)
{
if (data == null)
{
data = new byte[0];
}
var size = data.Length;
var payloadData = data.Take(HidReportSize - 7).ToArray();
var payloadBuilder = new ByteArrayBuilder();
payloadBuilder.Append(_channelId);
payloadBuilder.Append((byte)msgType);
payloadBuilder.Append((byte)(size >> 8 & 0xff));
payloadBuilder.Append((byte)(size & 0xff));
payloadBuilder.Append(payloadData);
payloadBuilder.AppendZerosTill(HidReportSize);
var report = _hidDevice.CreateReport();
report.Data = payloadBuilder.GetBytes();
if (!await _hidDevice.WriteReportAsync(report, HidTimeoutMs).ConfigureAwait(false))
{
throw new FidoException(FidoError.InterruptedIO, "Error writing to token");
}
var remainingData = data.Skip(HidReportSize - 7).ToArray();
var seq = 0;
while (remainingData.Length > 0)
{
payloadData = remainingData.Take(HidReportSize - 5).ToArray();
payloadBuilder.Clear();
payloadBuilder.Append(_channelId);
payloadBuilder.Append((byte)(0x7f & seq));
payloadBuilder.Append(payloadData);
payloadBuilder.AppendZerosTill(HidReportSize);
report = _hidDevice.CreateReport();
report.Data = payloadBuilder.GetBytes();
if (!await _hidDevice.WriteReportAsync(report, HidTimeoutMs).ConfigureAwait(false))
{
throw new FidoException(FidoError.InterruptedIO, "Error writing to token");
}
remainingData = remainingData.Skip(HidReportSize - 5).ToArray();
seq++;
}
}
public byte[] GetBytes()
{
var bytes = _byteArrayBuilder.GetBytes();
var outBytes = new ByteArrayBuilder();
byte currentByte = 0;
var currentBit = 7;
for (int i = 0; i < _byteArrayBuilder.Length; i++)
{
currentByte |= (byte)(bytes[i] << currentBit);
currentBit--;
if (currentBit < 0)
{
outBytes.Append(currentByte);
currentByte = 0;
currentBit = 7;
}
}
if (currentBit < 7)
{
outBytes.Append(currentByte);
}
return(outBytes.GetBytes());
}
public async Task <byte[]> ApduMessageAsync(FidoInstruction instruction, FidoParam1 param1 = FidoParam1.None, FidoParam2 param2 = FidoParam2.None, byte[] data = null)
{
if (data == null)
{
data = new byte[0];
}
var dataLen = data.Length;
var adpu = new ByteArrayBuilder();
adpu.Append(new byte[]
{
0x00, //CLA byte
(byte)instruction,
(byte)param1,
(byte)param2,
//some tokens only work with extended length
(byte)(dataLen >> 16 & 0xff),
(byte)(dataLen >> 8 & 0xff),
(byte)(dataLen & 0xff)
});
adpu.Append(data);
//max response size: 65536 byte
//needed for hyperfido
adpu.Append(new byte[] { 0x00, 0x00 });
var apduData = adpu.GetBytes();
var response = await CallAsync(FidoHidMsgType.ApduMessage, apduData).ConfigureAwait(false);
var responseData = response.Take(response.Length - 2).ToArray();
var status = response.Skip(response.Length - 2).Take(2).Reverse().ToArray();
var statusCode = (FidoApduResponse)BitConverter.ToUInt16(status, 0);
if (statusCode != FidoApduResponse.Ok)
{
throw new FidoException(statusCode);
}
return(responseData);
}
private async Task <byte[]> ReadResponseAsync(FidoHidMsgType msgType)
{
HidReport report;
FidoHidMsgType recvdMsgType;
do
{
report = await _hidDevice.ReadReportAsync(HidTimeoutMs).ConfigureAwait(false);
if (report.ReadStatus != HidDeviceData.ReadStatus.Success)
{
throw new FidoException(FidoError.InterruptedIO, $"Error reading from token: {report.ReadStatus}");
}
} while (!CheckHeader(report.Data, out recvdMsgType));
if (msgType != recvdMsgType)
{
throw new FidoException(FidoError.ProtocolViolation, $"received {recvdMsgType} instead of {msgType}");
}
var dataLength = (report.Data[5] << 8) + report.Data[6];
var payloadData = report.Data.Skip(7).Take(Math.Min(dataLength, HidReportSize)).ToArray();
var payload = new ByteArrayBuilder();
payload.Append(payloadData);
dataLength -= (int)payload.Length;
var seq = 0;
while (dataLength > 0)
{
do
{
report = await _hidDevice.ReadReportAsync(HidTimeoutMs).ConfigureAwait(false);
if (report.ReadStatus != HidDeviceData.ReadStatus.Success)
{
throw new FidoException(FidoError.InterruptedIO, $"Error reading from token: {report.ReadStatus}");
}
} while (!CheckHeader(report.Data, out recvdMsgType));
if ((recvdMsgType & FidoHidMsgType.CommandFlag) > 0)
{
throw new FidoException(FidoError.ProtocolViolation, "fragmented message continuation had command flag set");
}
if ((byte)recvdMsgType != (seq & (byte)FidoHidMsgType.SequenceIdMask))
{
throw new FidoException(FidoError.ProtocolViolation, $"received out-of-sequence message: Recvd:0x{(byte)recvdMsgType:X}, seq-nr:{seq}");
}
seq++;
payloadData = report.Data.Skip(5).Take(Math.Min(dataLength, HidReportSize)).ToArray();
dataLength -= payloadData.Length;
payload.Append(payloadData);
}
return(payload.GetBytes());
}
