public static async Task <AuthenticateResponse> AuthenticateAsync(U2FHidDevice u2fHidDevice, StartedAuthentication request, string facet, bool checkOnly)
{
ValidateRequest(request, facet);
var sha256 = new SHA256Managed();
var appParam = sha256.ComputeHash(Encoding.ASCII.GetBytes(request.AppId));
var clientDataString = GetAuthenticationClientData(request.Challenge, facet);
var clientParam = sha256.ComputeHash(Encoding.ASCII.GetBytes(clientDataString));
var keyHandleDecoded = Utils.Base64StringToByteArray(request.KeyHandle);
var byteArrayBuilder = new ByteArrayBuilder();
byteArrayBuilder.Append(clientParam);
byteArrayBuilder.Append(appParam);
byteArrayBuilder.Append((byte)keyHandleDecoded.Length);
byteArrayBuilder.Append(keyHandleDecoded);
var data = byteArrayBuilder.GetBytes();
var p1 = (byte)(checkOnly ? 0x07 : 0x03);
var p2 = (byte)0x00;
var response = await u2fHidDevice.SendApduAsync(Constants.INS_SIGN, p1, p2, data);
var responseBase64 = Utils.ByteArrayToBase64String(response);
var clientDataBase64 = Utils.ByteArrayToBase64String(Encoding.ASCII.GetBytes(clientDataString));
var authenticateResponse = new AuthenticateResponse(clientDataBase64, responseBase64, request.KeyHandle);
return(authenticateResponse);
}
public static async Task <RegisterResponse> RegisterAsync(U2FHidDevice u2fHidDevice, StartedRegistration request, string facet)
{
ValidateRequest(request, facet);
var appParam = GetApplicationParameter(request.AppId);
var clientData = GetRegistrationClientData(request.Challenge, facet);
var challengeParam = GetChallengeParameter(clientData);
var data = challengeParam.Concat(appParam).ToArray();
var p1 = (byte)0x03;
var p2 = (byte)0x00;
var response = await u2fHidDevice.SendApduAsync(Constants.INS_ENROLL, p1, p2, data);
var registrationDataBase64 = Utils.ByteArrayToBase64String(response);
var clientDataBase64 = Utils.ByteArrayToBase64String(Encoding.ASCII.GetBytes(clientData));
var registerResponse = new RegisterResponse(registrationDataBase64, clientDataBase64);
return(registerResponse);
}
