Based Online CRC calculation, when I entered hex string data =
503002080000024400003886030400000000010100
I get result CRC-CCITT (0xFFFF) =
0x354E (Expected Result)
.
I use the code below, but the results of CalcCRC16() are 0xACEE. What the lack of script below?
using System;
using System.Windows.Forms;
using System.Runtime.Remoting.Metadata.W3cXsd2001;
using System.Diagnostics;
namespace WindowsFormsApplication1 {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e) {
string result = CalcCRC16("503002080000024400003886030400000000010100");
Debug.Print(result);
// result = ACEE
// result expected = 354E
}
// CRC-CCITT (0xFFFF) with poly 0x1021
// input (hex string) = "503002080000024400003886030400000000010100"
// result expected (hex string) = "354E"
public string CalcCRC16(string strInput) {
ushort temp = 0;
ushort crc = 0xFFFF;
byte[] bytes = GetBytesFromHexString(strInput);
for (int j = 0; j < bytes.Length; j++) {
crc = (ushort)(crc ^ bytes[j]);
for (int i = 0; i < 8; i++) {
if ((crc & 0x0001) == 1)
crc = (ushort)((crc >> 1) ^ 0x1021);
else
crc >>= 1;
}
}
crc = (ushort)~(uint)crc;
temp = crc;
crc = (ushort)((crc << 8) | (temp >> 8 & 0xFF));
return crc.ToString("X4");
}
public Byte[] GetBytesFromHexString(string strInput) {
Byte[] bytArOutput = new Byte[] { };
if (!string.IsNullOrEmpty(strInput) && strInput.Length % 2 == 0) {
SoapHexBinary hexBinary = null;
try {
hexBinary = SoapHexBinary.Parse(strInput);
if (hexBinary != null)
bytArOutput = hexBinary.Value;
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
}
}
return bytArOutput;
}
}
}
I found the answer and I will share here.. may be useful to others.
strInput = 503002080000024400003886030400000000010100
initial = 0xFFFF
poly = 0x1021
strOutput = 354E
reference = Online CRC Calc
public string CalcCRC16(string strInput) {
ushort crc = 0xFFFF;
byte[] data = GetBytesFromHexString(strInput);
for (int i = 0; i < data.Length; i++) {
crc ^= (ushort)(data[i] << 8);
for (int j = 0; j < 8; j++) {
if ((crc & 0x8000) > 0)
crc = (ushort)((crc << 1) ^ 0x1021);
else
crc <<= 1;
}
}
return crc.ToString("X4");
}
public Byte[] GetBytesFromHexString(string strInput) {
Byte[] bytArOutput = new Byte[] { };
if (!string.IsNullOrEmpty(strInput) && strInput.Length % 2 == 0) {
SoapHexBinary hexBinary = null;
try {
hexBinary = SoapHexBinary.Parse(strInput);
if (hexBinary != null) {
bytArOutput = hexBinary.Value;
}
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
}
}
return bytArOutput;
}