/// <summary>
/// Method to check if the mic is valid
/// </summary>
/// <param name="nwskey">the network security key</param>
/// <returns>if the Mic is valid or not</returns>
public override bool CheckMic(string nwskey)
{
IMac mac = MacUtilities.GetMac("AESCMAC");
KeyParameter key = new KeyParameter(ConversionHelper.StringToByteArray(nwskey));
mac.Init(key);
byte[] block =
{
0x49, 0x00, 0x00, 0x00, 0x00, (byte)Direction, (byte)DevAddr.Span[3], (byte)DevAddr.Span[2], (byte)DevAddr.Span[1],
(byte)DevAddr.Span[0], Fcnt.Span[0], Fcnt.Span[1], 0x00, 0x00, 0x00, (byte)(RawMessage.Length - 4)
};
var algoinput = block.Concat(RawMessage.Take(RawMessage.Length - 4)).ToArray();
byte[] result = new byte[16];
mac.BlockUpdate(algoinput, 0, algoinput.Length);
result = MacUtilities.DoFinal(mac);
return(Mic.ToArray().SequenceEqual(result.Take(4).ToArray()));
}
