public string ValidateCrc(string qrData)
{
var data = qrData.Substring(0, qrData.Length - 4);
var crc = new CRC.Crc(CRC.CrcStdParams.StandartParameters[CRC.CrcAlgorithms.Crc16CcittFalse]).ComputeHash(System.Text.Encoding.UTF8.GetBytes(data));
var crcValue = crc.ToHex(true).GetLast(4);
if (0 != StringComparer.Ordinal.Compare(crcValue, qrData.GetLast(4).ToUpperInvariant()))
{
throw new SecurityException(LibraryResources.InvalidCrc);
}
return(crcValue);
}
private void btn_CRC_Click(object sender, EventArgs e)
{
byte[] CRC32 = new byte[4];
string command = tb_command.Text;
char[] spliter = new char[] { ' ' };
string[] subcommand = command.Split(spliter);
byte[] subcommand_byte = new byte[subcommand.Length];
for (int i = 0; i < subcommand_byte.Length; i++)
{
subcommand_byte[i] = byte.Parse(subcommand[i], System.Globalization.NumberStyles.HexNumber);
}
CRC.Crc CRC32_X = new CRC.Crc(CRC.CrcStdParams.StandartParameters[CRC.CrcAlgorithms.Crc32Mpeg2]);
CRC32 = CRC32_X.ComputeHash(subcommand_byte);
tb_crc_result.Text = BitConverter.ToString(CRC32, 0, 4).Replace("-", " ");
}
