common/crc16.h

   1 //-----------------------------------------------------------------------------
   2 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   3 // at your option, any later version. See the LICENSE.txt file for the text of
   4 // the license.
   5 //-----------------------------------------------------------------------------
   6 // CRC16
   7 //-----------------------------------------------------------------------------
   8 #ifndef __CRC16_H
   9 #define __CRC16_H
  10
  11 #include "common.h"
  12
  13 #define CRC16_POLY_CCITT   0x1021
  14 #define CRC16_POLY_KERMIT  0x8408
  15 #define CRC16_POLY_LEGIC   0xc6c6 //0x6363
  16 #define CRC16_POLY_DNP     0x3d65
  17
  18 #define X25_CRC_CHECK     ((uint16_t)(~0xF0B8 & 0xFFFF)) // use this for checking of a correct crc
  19
  20 typedef enum {
  21     CRC_NONE,
  22     CRC_11784,
  23     CRC_14443_A,
  24     CRC_14443_B,
  25     CRC_15693,
  26     CRC_ICLASS,
  27     CRC_FELICA,
  28     CRC_LEGIC,
  29     CRC_CCITT,
  30     CRC_KERMIT,
  31     CRC_XMODEM,
  32     CRC_CRYPTORF,
  33 } CrcType_t;
  34
  35 uint16_t update_crc16_ex(uint16_t crc, uint8_t c, uint16_t polynomial);
  36 uint16_t update_crc16(uint16_t crc, uint8_t c);
  37 uint16_t Crc16(uint8_t const *d, size_t length, uint16_t remainder, uint16_t polynomial, bool refin, bool refout);
  38
  39 uint16_t Crc16ex(CrcType_t ct, const uint8_t *d, size_t n);
  40 void compute_crc(CrcType_t ct, const uint8_t *d, size_t n, uint8_t *first, uint8_t *second);
  41 bool check_crc(CrcType_t ct, const uint8_t *d, size_t n);
  42
  43 // Calculate CRC-16/CCITT-FALSE
  44 uint16_t crc16_ccitt(uint8_t const *d, size_t n);
  45
  46 // Calculate CRC-16/KERMIT (FDX-B ISO11784/85)  LF
  47 uint16_t crc16_fdxb(uint8_t const *d, size_t n);
  48
  49 // Calculate CRC-16/KERMIT
  50 uint16_t crc16_kermit(uint8_t const *d, size_t n);
  51
  52 // Calculate CRC-16/XMODEM (FeliCa)
  53 uint16_t crc16_xmodem(uint8_t const *d, size_t n);
  54
  55 // Calculate CRC-16/X25 (ISO15693, ISO14443 CRC-B,ISO/IEC 13239)
  56 uint16_t crc16_x25(uint8_t const *d, size_t n);
  57
  58 // Calculate CRC-16/CRC-A (ISO14443 CRC-A)
  59 uint16_t crc16_a(uint8_t const *d, size_t n);
  60
  61 // Calculate CRC-16/iCLASS
  62 uint16_t crc16_iclass(uint8_t const *d, size_t n);
  63
  64 // Calculate CRC-16/Legic
  65 // the initial_value is based on the previous legic_Crc8 of the UID.
  66 // ie:  uidcrc = 0x78  then initial_value == 0x7878
  67 uint16_t crc16_legic(uint8_t const *d, size_t n, uint8_t uidcrc);
  68
  69 // table implementation
  70 void init_table(CrcType_t crctype);
  71 void reset_table(void);
  72 void generate_table(uint16_t polynomial, bool refin);
  73 uint16_t crc16_fast(uint8_t const *d, size_t n, uint16_t initval, bool refin, bool refout);
  74
  75 #endif