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https://github.com/RfidResearchGroup/proxmark3.git
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71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
//-----------------------------------------------------------------------------
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// CRC16
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//-----------------------------------------------------------------------------
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#ifndef __CRC16_H
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#define __CRC16_H
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#include <stdint.h>
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#include <stdio.h>
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#include "util.h"
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#define CRC16_POLY_CCITT 0x1021
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#define CRC16_POLY_LEGIC 0xc6c6 //0x6363
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#define CRC16_POLY_DNP 0x3d65
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typedef enum {
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CRC_NONE,
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CRC_14A,
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CRC_14B,
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CRC_15,
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CRC_15_ICLASS,
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CRC_FELICA,
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CRC_LEGIC,
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CRC_DNP,
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CRC_CCITT,
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} CrcType_t;
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uint16_t update_crc16_ex( uint16_t crc, uint8_t c, uint16_t polynomial );
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uint16_t update_crc16(uint16_t crc, uint8_t c);
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uint16_t crc16(uint8_t const *message, size_t length, uint16_t remainder, uint16_t polynomial, bool refin, bool refout);
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// Calculate CRC-16/CCITT-FALSE checksum
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uint16_t crc16_ccitt(uint8_t const *d, size_t n);
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// Calculate CRC-16/KERMIT checksum
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uint16_t crc16_kermit(uint8_t const *d, size_t n);
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// Calculate CRC-16/XMODEM (FeliCa) checksum
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uint16_t crc16_xmodem(uint8_t const *d, size_t n);
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// Calculate CRC-16/X25 (ISO15693, ISO14443 CRC-B,ISO/IEC 13239) checksum
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uint16_t crc16_x25(uint8_t const *d, size_t n);
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// Calculate CRC-16/CRC-A (ISO14443 CRC-A) checksum
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uint16_t crc16_a(uint8_t const *d, size_t n);
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// Calculate CRC-16/iCLASS checksum
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uint16_t crc16_iclass(uint8_t const *d, size_t n);
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// Calculate CRC-16/DNP checksum
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uint16_t crc16_dnp(uint8_t const *d, size_t n);
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// Calculate CRC-16/Legic checksum
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// the initial_value is based on the previous legic_Crc8 of the UID.
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// ie: uidcrc = 0x78 then initial_value == 0x7878
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uint16_t crc16_legic(uint8_t const *d, size_t n, uint8_t uidcrc);
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// table implementation
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void init_table(CrcType_t crctype);
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void reset_table(void);
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void generate_table(uint16_t polynomial, bool refin);
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uint16_t crc16_fast(uint8_t const *d, size_t n, uint16_t initval, bool refin, bool refout);
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//checks
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bool check_crc16_ccitt(uint8_t const *d, size_t n);
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#endif
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