private async Task <ApduResponse> U2F_Authenticate(byte[] clientDataHash, byte[] appIdHash, byte[] keyHandle, bool checkOnly)
{
var request = new ApduRequest
{
Ins = (byte)CTAP1_INS.Authenticate,
P1 = checkOnly ? (byte)0x07 : (byte)0x03,
data = clientDataHash.Concat(appIdHash).Concat(Enumerable.Repeat((byte)keyHandle.Length, 1)).Concat(keyHandle).ToArray()
};
return(await Apdu.SendAdpu(_connection, request));
}
public static async Task <ApduResponse> SendAdpu(Stream connection, ApduRequest request)
{
var dataLen = (ushort)(request.data?.Length ?? 0);
var maxRsBytes = 2;
if (request.maxResponseSize.HasValue)
{
var rss = request.maxResponseSize.Value;
if (rss == 0)
{
maxRsBytes = 0;
}
else if (rss <= 0xff)
{
maxRsBytes = 1;
}
else
{
maxRsBytes = 2;
}
}
var packetLength = 1 + 1 + 2 + (dataLen == 0 ? 0 : (dataLen <= 0xff ? 1 : 3)) + dataLen + maxRsBytes;
var packet = new byte[packetLength];
packet[0] = request.Cla;
packet[1] = request.Ins;
packet[2] = request.P1;
packet[3] = request.P2;
if (dataLen > 0)
{
byte dataOffset = 4;
if (dataOffset <= 0xff)
{
packet[4] = (byte)(dataOffset & 0xff);
dataOffset += 1;
}
else
{
packet[4] = 0;
packet[5] = (byte)((dataLen >> 8) & 0xff);
packet[6] = (byte)(dataLen & 0xff);
dataOffset += 3;
}
Array.Copy(request.data, 0, packet, dataOffset, request.data?.Length ?? 0);
}
if (request.maxResponseSize.HasValue)
{
if (maxRsBytes == 1)
{
packet[packet.Length - 1] = (byte)(request.maxResponseSize.Value & 0xff);
}
else if (maxRsBytes == 2)
{
packet[packet.Length - 1] = (byte)(request.maxResponseSize.Value & 0xff);
packet[packet.Length - 2] = (byte)((request.maxResponseSize.Value >> 8) & 0xff);
}
}
await connection.WriteAsync(packet, 0, packet.Length);
await connection.FlushAsync();
var readBuffer = new byte[maxRsBytes >= 2 ? ushort.MaxValue : byte.MaxValue];
var bytesRead = await connection.ReadAsync(readBuffer, 0, readBuffer.Length);
var rs = new ApduResponse
{
SW1 = 6
};
if (bytesRead >= 2)
{
rs.SW1 = readBuffer[bytesRead - 2];
rs.SW2 = readBuffer[bytesRead - 1];
if (bytesRead > 2)
{
rs.data = new byte[bytesRead - 2];
Array.Copy(readBuffer, 0, rs.data, 0, rs.data.Length);
}
}
return(rs);
}
