private void VerifyAuthSignature(FidoAppId appId, FidoSignatureData signatureData, FidoClientData clientData,
FidoDeviceRegistration deviceRegistration)
{
if (appId == null)
{
throw new ArgumentNullException("appId");
}
if (signatureData == null)
{
throw new ArgumentNullException("signatureData");
}
if (clientData == null)
{
throw new ArgumentNullException("clientData");
}
if (deviceRegistration == null)
{
throw new ArgumentNullException("deviceRegistration");
}
if (String.IsNullOrEmpty(clientData.RawJsonValue))
{
throw new InvalidOperationException("Client data has no JSON representation");
}
var counterBytes = BitConverter.GetBytes(signatureData.Counter);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(counterBytes);
}
var signedBytes = PackBytes(
Helpers.Sha256(appId.ToString()),
new [] { signatureData.UserPresence },
counterBytes,
Helpers.Sha256(clientData.RawJsonValue));
VerifySignature(deviceRegistration, signatureData.Signature, signedBytes);
if (signatureData.UserPresence != UserPresentFlag)
{
throw new InvalidOperationException("User presence invalid during authentication");
}
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
return(FidoSignatureData.FromWebSafeBase64(reader.Value.ToString()));
}
public FidoAuthenticateResponse(FidoClientData clientData, FidoSignatureData signatureData, FidoKeyHandle keyHandle)
{
ClientData = clientData;
SignatureData = signatureData;
KeyHandle = keyHandle;
}