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[proxmark3-svn] / common / crc.h
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bd20f8f4 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// Generic CRC calculation code.
7//-----------------------------------------------------------------------------
68d9d60a 8
e30c654b 9#ifndef __CRC_H
10#define __CRC_H
68d9d60a 11
3e134b4c 12#include <stdint.h> //uint32+
13#include <stdbool.h> //bool
73d04bb4 14#include <stddef.h>
3e134b4c 15#include "util.h" // reflect, bswap_16
68d9d60a 16
17typedef struct crc {
18 uint32_t state;
19 int order;
20 uint32_t polynom;
21 uint32_t initial_value;
22 uint32_t final_xor;
23 uint32_t mask;
3e134b4c 24 int topbit;
25 bool refin; /* Parameter: Reflect input bytes? */
26 bool refout; /* Parameter: Reflect output CRC? */
68d9d60a 27} crc_t;
28
3e134b4c 29/* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32
30 * polynom is the CRC polynom. initial_value is the initial value of a clean state.
31 * final_xor is XORed onto the state before returning it from crc_result().
32 * refin is the setting for reversing (bitwise) the bytes during crc
33 * refot is the setting for reversing (bitwise) the crc byte before returning it.
34 */
35extern void crc_init_ref(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor, bool refin, bool refout);
36
68d9d60a 37/* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32
38 * polynom is the CRC polynom. initial_value is the initial value of a clean state.
39 * final_xor is XORed onto the state before returning it from crc_result(). */
40extern void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor);
41
3e134b4c 42
ee4e2816 43/* Update the crc state. data is the data of length data_width bits (only the
68d9d60a 44 * data_width lower-most bits are used).
e30c654b 45 */
68d9d60a 46extern void crc_update(crc_t *crc, uint32_t data, int data_width);
47
48/* Clean the crc state, e.g. reset it to initial_value */
49extern void crc_clear(crc_t *crc);
50
51/* Get the result of the crc calculation */
52extern uint32_t crc_finish(crc_t *crc);
53
73d04bb4 54// Calculate CRC-8/Maxim checksum
ee4e2816 55uint32_t CRC8Maxim(uint8_t *buff, size_t size);
56
3e134b4c 57// Calculate CRC-4/Legic checksum
58uint32_t CRC4Legic(uint8_t *buff, size_t size);
59
ee4e2816 60// Calculate CRC-8/Legic checksum
61uint32_t CRC8Legic(uint8_t *buff, size_t size);
ee4e2816 62
3e134b4c 63// Calculate CRC-16/Legic checksum
64// the initial_value is based on the previous legic_Crc8 of the UID.
65// ie: uidcrc = 0x78 then initial_value == 0x7878
66uint32_t CRC16Legic(uint8_t *buff, size_t size, uint8_t uidcrc);
67
3e134b4c 68// test crc 16.
69uint32_t CRC16_DNP(uint8_t *buff, size_t size);
ba4ad25b 70uint32_t CRC16_CCITT(uint8_t *buff, size_t size);
82e690f4 71uint32_t CRC16_Iso15693(uint8_t *buff, size_t size);
72uint32_t CRC16_ICLASS(uint8_t *buff, size_t size);
3e134b4c 73
68d9d60a 74/* Static initialization of a crc structure */
75#define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \
76 .state = ((_initial_value) & ((1L<<(_order))-1)), \
77 .order = (_order), \
78 .polynom = (_polynom), \
79 .initial_value = (_initial_value), \
80 .final_xor = (_final_xor), \
3e134b4c 81 .mask = ((1L<<(_order))-1) \
82 .refin = FALSE, \
83 .refout = FALSE \
84 }
68d9d60a 85
e30c654b 86#endif /* __CRC_H */
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