Пример #1
0
        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;
                }
                }
            }
        }
Пример #2
0
        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;
                }
                }
            }
        }