c# - What the lack of CRC-CCITT (0xFFFF)? -


based online crc calculation, when entered hex string data =

503002080000024400003886030400000000010100

i result crc-ccitt (0xffff) =

0x354e (expected result)

.

i use code below, results of calccrc16() 0xacee. 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) 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);             (int j = 0; j < bytes.length; j++) {                 crc = (ushort)(crc ^ bytes[j]);                 (int = 0; < 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 answer , share here.. may useful 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);     (int = 0; < data.length; i++) {         crc ^= (ushort)(data[i] << 8);         (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; }

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