C # crc16 source code

Algorithm:

  Public   Ushort [] Crc16table = {  0x0 , Zero X 1021 , Zero X 2042 , Zero X 3063 , Zero X 4084 , 0x50a5 , 0x60c6 , 0x70e7  ,  Zero X 8108 ,Zero X 9129 , 0xa14a , 0xb16b , 0xc18c , 0xd1ad , 0xe1ce , 0xf1ef  ,  Zero X 1231 , Zero x 210 , Zero X 3273 , Zero X 2252 , 0x52b5 , Zero X 4294 , 0x72f7 , 0x62d6  ,  Zero X 9339 , Zero X 8318 , 0xb37b , 0xa35a , 0xd3bd , 0xc39c , 0xf3ff , 0xe3de  ,  Zero X 2462 , Zero X 3443 ,Zero x 420 , Zero X 1401 , 0x64e6 , 0x74c7 , 0x44a4 , Zero X 5485  ,  0xa56a , 0xb54b , Zero X 8528 , Zero X 9509 , 0xe5ee , 0xf5cf , 0xc5ac , 0xd58d  ,  Zero X 3653 , Zero X 2672 , Zero X 1611 , Zero X 630 , 0x76d7 , 0x66f6 , Zero X 5695 , 0x46b4  ,  0xb75b , 0xa77a , Zero X 9719 ,Zero X 8738 , 0xf7df , 0xe7fe , 0xd79d , 0xc7bc  ,  0x48c4 , 0x58e5 , Zero X 6886 , 0x78a7 , Zero X 840 , Zero X 1861 , Zero X 2802 , Zero X 3823 ,  0xc9cc , 0xd9ed , 0xe98e , 0xf9af , Zero X 8948 , Zero X 9969 , 0xa90a , 0xb92b  ,  0x5af5 , 0x4ad4 , 0x7ab7 , 0x6a96 ,0x1a71 , 0xa50 , 0x3a33 , 0x2a12  ,  0 xdbfd , 0 xcbdc , 0 xfbbf , 0xeb9e , 0x9b79 , 0x8b58 , 0xbb3b , 0xab1a  , 0x6ca6 , 0x7c87 , 0x4ce4 , 0x5cc5 , 0x2c22 , 0x3c03 , 0x600. , 0x1c41  ,  0 xedae , 0xfd8f , 0 xcdec , 0 xddcd , 0xad2a , 0xbd0b , 0x8d68 , 0x9d49  ,  0x7e97 , 0x6eb6 , 0x5ed5 , 0x4ef4 , 0x3e13 , 0x2e32 , 0x1e51 , 0xe70  ,  0xff9f ,0 xefbe , 0 xdfdd , 0 xcffc , 0xbf1b , 0xaf3a , 0x9f59 , 0x8f78  ,  Zero X 9188 , 0x81a9 , 0xb1ca , 0xa1eb , 0xd10c , 0xc12d , 0xf14e , 0xe16f  ,  Zero X 1080 , 0xa1 , 0x30c2 , 0x20e3 , Zero X 5004 , Zero X 4025 , Zero X 7046 , Zero X 6067  ,  0x83b9 , Zero X 9398 ,0xa3fb , 0xb3da , 0xc33d , 0xd31c , 0xe37f , 0xf35e  ,  0x2b1 , Zero X 1290 , 0x22f3 , 0x32d2 , Zero X 4235 , Zero X 5214 , Zero X 6277 , Zero X 7256  ,  0xb5ea , 0xa5cb , 0x95a8 , Zero X 8589 , 0xf56e , 0xe54f , 0xd52c , 0xc50d  ,  0x34e2 , 0x24c3 , 0x14a0 ,Zero X 481 , Zero X 7466 , Zero X 6447 , Zero X 5424 , Zero X 4405  ,  0xa7db , 0xb7fa , Zero X 8799 , 0x97b8 , 0xe75f , 0xf77e , 0xc71d , 0xd73c ,  0x26d3 , 0x36f2 , Zero X 691 , 0x16b0 , Zero X 6657 , Zero X 7676 , Zero X 4615 , Zero X 5634  ,  0xd94c , 0xc96d , 0xf90e , 0xe92f ,0x99c8 , 0x89e9 , 0xb98a , 0xa9ab  ,  Zero X 5844 , Zero X 4865 , Zero X 7806 , Zero X 6827 , 0x18c0 , 0x8e1 , Zero X 3882 , 0x28a3  , 0xcb7d , 0xdb5c , 0xeb3f , 0xfb1e , 0x8bf9 , 0x9bd8 , 0 xabbb , 0xbb9a  ,  0x4a75 , 0x5a54 , 0x6a37 , 0x7a16 , 0xaf1 , 0x1ad0 , 0x2ab3 , 0x3a92  ,  0xfd2e , 0xed0f , 0xdd6c , 0xcd4d , 0 xbdaa , 0xad8b , 0x9de8 , 0x8dc9  ,  0x7c26 ,0x6c07 , 0x5c64 , 0x4c45 , 0x3ca 2 , 0x2c83 , 0x1ce0 , 0xcc0.  ,  0xef1f , 0xff3e , 0xcf5d , 0xdf7c , 0xaf9b , 0 xbfba , 0x8fd9 , 0x9ff8  ,  0x6e17 , 0x7e36 , 0x4e55 , 0x5e74 , 0x2e93 , 0x3eb2 , 0xed1 , 0x1ef0  };  Public   Int Crc16 (byte [] dat, Int  Count ){  Int CRC = 0  ; Byte crctemp;  Int I = 0  ;  While (Count> 0  ) {Count -= 1  ; Crctemp = Convert. tobyte (CRC>8  ); CRC = (CRC < 8 )& 0 xFFFF  ; CRC = (Crc16table [crctemp ^ dat [I] ^ CRC )& 0 xFFFF  ; I + = 1  ;}  Return  CRC ;}  Public   Bool Check (byte [] portdata) {byte [] porttemp = New Byte [ 4  ]; Porttemp [  0 ] = Portdata [ 1  ]; Porttemp [  1 ] = Portdata [ 2  ]; Porttemp [  2 ] = 0  ; Porttemp [  3 ] = 0  ;  Int Crctemp = crc16 (porttemp, 2  ); Porttemp [  2 ] = Convert. tobyte (crctemp> 8  ); Porttemp [  3 ] = Convert. tobyte (crctemp & 255  );  If (Porttemp [ 2 ] = Portdata [3 ] & Porttemp [ 3 ] = Portdata [ 4  ]) {Console. writeline (  "  This is the correct parking card number through CRC verification  "  );  Return   True  ;}  Else  {Console. writeline (  " Cannot pass CRC verification, incorrect parking card  "  );  Return   False  ;}} 

Call:

 
Byte[] Aaff = {0xdd,0xdd,0xff};IntAA =Crc16 (aaff, aaff. Length );StringBB = convert. tostring (AA,16). Toupper ();