private void DecryptFrame(MBusFrame data)
{
DriverContext.Logger.LogTrace($"Check frame {data?.CiField}");
if (data != null && data.CiField == 0x5B)
{
var controlHigh = data.RawData.Span[18];
DriverContext.Logger.LogTrace($"Check frame if frame is supported {controlHigh}");
switch (controlHigh & 0x0F)
{
case 5:
{
if (!(OmsHelper.AesDecrypt(_aesKey, data, _logger) is VariableDataFrame variableDataFrame))
{
DriverContext.Logger.LogError("Could not encrypt data frame");
return;
}
foreach (var child in Children)
{
if (child is OmsDriverAttribute att)
{
att.SetData(variableDataFrame);
}
}
break;
}
}
}
}
private void DecryptFrame(MBusFrame data)
{
if (data != null && data.CiField == 0x5B)
{
var controlHigh = data.RawData.Span[OffsetUserData + 11];
var controlLow = data.RawData.Span[OffsetUserData + 10];
switch (controlHigh & 0x0F)
{
case 5:
{
int countEncBlocks = controlLow >> 4;
System.Console.WriteLine(
$"AES with dyn.init vector {countEncBlocks} d 16 byte blocks plus % d unencrypted data {data.RawData.Length - 12 - 16 * countEncBlocks}");
var encrypted = OmsHelper.AesDecrypt(_aesKey, data, NullLogger.Instance);
break;
}
}
}
}