mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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237 lines
7.2 KiB
C
237 lines
7.2 KiB
C
/* reveng.h
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* Greg Cook, 23/Feb/2019
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*/
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/* CRC RevEng: arbitrary-precision CRC calculator and algorithm finder
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* Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018,
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* 2019 Gregory Cook
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*
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* This file is part of CRC RevEng.
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*
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* CRC RevEng is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* CRC RevEng is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CRC RevEng. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef REVENG_H
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#define REVENG_H 1
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/* Configuration options */
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#include "config.h"
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#ifndef BMP_T
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# error config.h: BMP_T must be defined as unsigned long or a longer unsigned type
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#endif
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#ifndef BMP_C
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# error config.h: BMP_C() must define a BMP_T constant
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#endif
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#if !defined PRESETS && !defined BMPMACRO
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# undef BMP_BIT
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# undef BMP_SUB
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#endif
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#undef BMP_POF2
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#ifdef BMP_BIT
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# ifndef BMP_SUB
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# error config.h: BMP_SUB must be defined as the highest power of two that is strictly less than BMP_BIT
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# elif BMP_BIT < 32
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# error config.h: BMP_BIT must be at least 32
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# elif BMP_SUB < 16
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# error config.h: BMP_SUB must be at least 16
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# elif (BMP_SUB >= BMP_BIT || BMP_SUB << 1 < BMP_BIT || BMP_SUB & (BMP_SUB - 1))
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# error config.h: BMP_SUB must be defined as the highest power of two that is strictly less than BMP_BIT
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# else /* BMP_SUB */
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# define SETBMP()
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# endif /* BMP_SUB */
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# if BMP_BIT == 32
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# define BMP_POF2 5
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# elif BMP_BIT == 64
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# define BMP_POF2 6
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# elif BMP_BIT == 128
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# define BMP_POF2 7
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# elif BMP_BIT == 256
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# define BMP_POF2 8
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# elif BMP_BIT == 512
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# define BMP_POF2 9
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# elif BMP_BIT == 1024
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# define BMP_POF2 10
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# elif BMP_BIT == 2048
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# define BMP_POF2 11
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# elif BMP_BIT == 4096
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# define BMP_POF2 12
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# elif BMP_BIT == 8192
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# define BMP_POF2 13
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# elif BMP_BIT == 16384
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# define BMP_POF2 14
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# elif BMP_BIT == 32768
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# define BMP_POF2 15
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# elif BMP_BIT == 65536
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# define BMP_POF2 16
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/* may extend list as required */
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# elif (BMP_BIT & (BMP_BIT - 1)) == 0
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# define BMP_POF2 1
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# endif
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#else /* BMP_BIT */
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# define BMP_BIT bmpbit
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# define BMP_SUB bmpsub
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# define SETBMP() setbmp()
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#endif /* BMP_BIT */
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/* Global definitions */
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/* CRC RevEng version string */
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#define VERSION "1.6.2"
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/* bmpbit.c */
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typedef BMP_T bmp_t;
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extern int bmpbit, bmpsub;
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void setbmp(void);
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/* poly.c */
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#define P_REFIN 1
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#define P_REFOUT 2
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#define P_MULXN 4
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#define P_RTJUST 8
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#define P_UPPER 16
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#define P_SPACE 32
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#define P_LTLBYT 64
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#define P_DIRECT 128
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/* class flags */
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#define P_CLBIT0 256
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#define P_CLBIT1 512
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#define P_SOLID 1024
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#define P_CLMASK (P_SOLID | P_CLBIT1 | P_CLBIT0)
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#define P_UNDFCL 0
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#define P_UNCONF (P_CLBIT0)
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#define P_THIRDP (P_CLBIT1)
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#define P_ACADEM (P_CLBIT1 | P_CLBIT0)
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#define P_CONFIR (P_SOLID | P_CLBIT0)
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#define P_ATTEST (P_SOLID | P_CLBIT1)
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/* default flags */
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#define P_BE (P_RTJUST | P_MULXN)
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#define P_LE (P_REFIN | P_REFOUT | P_MULXN)
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#define P_BELE (P_REFOUT | P_MULXN)
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#define P_LEBE (P_REFIN | P_RTJUST | P_MULXN)
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/* A poly_t constant representing the polynomial 0. */
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#define PZERO {0UL, (bmp_t *) 0}
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typedef struct {
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unsigned long length; /* number of significant bits */
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bmp_t *bitmap; /* bitmap, MSB first, */
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/* left-justified in each word */
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} poly_t;
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poly_t filtop(FILE *input, unsigned long length, int flags, int bperhx);
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poly_t strtop(const char *string, int flags, int bperhx);
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char *ptostr(const poly_t poly, int flags, int bperhx);
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char *pxsubs(const poly_t poly, int flags, int bperhx, unsigned long start, unsigned long end);
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poly_t pclone(const poly_t poly);
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void pcpy(poly_t *dest, const poly_t src);
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void pcanon(poly_t *poly);
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void pnorm(poly_t *poly);
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void psnorm(poly_t *poly);
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void pchop(poly_t *poly);
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void pkchop(poly_t *poly);
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unsigned long plen(const poly_t poly);
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int pcmp(const poly_t *a, const poly_t *b);
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int psncmp(const poly_t *a, const poly_t *b);
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int ptst(const poly_t poly);
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unsigned long pfirst(const poly_t poly);
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unsigned long plast(const poly_t poly);
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poly_t psubs(const poly_t src, unsigned long head, unsigned long start, unsigned long end, unsigned long tail);
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void pright(poly_t *poly, unsigned long length);
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void pshift(poly_t *dest, const poly_t src, unsigned long head, unsigned long start, unsigned long end, unsigned long tail);
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void ppaste(poly_t *dest, const poly_t src, unsigned long skip, unsigned long seek, unsigned long end, unsigned long fulllength);
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void pdiff(poly_t *dest, const poly_t src, unsigned long ofs);
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void psum(poly_t *dest, const poly_t src, unsigned long ofs);
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void prev(poly_t *poly);
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void prevch(poly_t *poly, int bperhx);
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void prcp(poly_t *poly);
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void pinv(poly_t *poly);
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poly_t pmod(const poly_t dividend, const poly_t divisor);
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poly_t pcrc(const poly_t message, const poly_t divisor, const poly_t init, const poly_t xorout, int flags);
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int piter(poly_t *poly);
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void palloc(poly_t *poly, unsigned long length);
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void pfree(poly_t *poly);
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void praloc(poly_t *poly, unsigned long length);
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int pmpar(const poly_t poly, const poly_t mask);
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int pident(const poly_t a, const poly_t b);
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/* model.c */
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/* A model_t constant representing an uninitialised model or zero-bit CRC algorithm. */
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#define MZERO {PZERO, PZERO, P_BE, PZERO, PZERO, PZERO, NULL}
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typedef struct {
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poly_t spoly; /* polynomial with highest-order term removed. length determines CRC width */
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poly_t init; /* initial register value. length == spoly.length */
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int flags; /* P_REFIN and P_REFOUT indicate reflected input/output */
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poly_t xorout; /* final register XOR mask. length == spoly.length */
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poly_t check; /* optional check value, the CRC of the UTF-8 string "123456789" */
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poly_t magic; /* optional magic check value, the residue of a valid codeword */
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const char *name; /* optional canonical name of the model */
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} model_t;
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void mcpy(model_t *dest, const model_t *src);
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void mfree(model_t *model);
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int mcmp(const model_t *a, const model_t *b);
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char *mtostr(const model_t *model);
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void mcanon(model_t *model);
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void mcheck(model_t *model);
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void mrev(model_t *model);
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void mnovel(model_t *model);
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/* preset.c */
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#define M_OVERWR 1
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int mbynam(model_t *dest, const char *key);
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void mbynum(model_t *dest, int num);
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int mcount(void);
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char *mnames(void);
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void mmatch(model_t *model, int flags);
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/* reveng.c */
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#define R_HAVEP 1
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#define R_HAVEI 2
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#define R_HAVERI 4
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#define R_HAVERO 8
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#define R_HAVEX 16
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#define R_HAVEQ 32
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#define R_SPMASK 0x7FFFFFFUL
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model_t *reveng(const model_t *guess, const poly_t qpoly, int rflags, int args, const poly_t *argpolys);
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/* cli.c */
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#define C_INFILE 1
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#define C_NOPCK 2
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#define C_NOBFS 4
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#define C_RESULT 8
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#define BUFFER 32768
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int reveng_main(int argc, char *argv[]);
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void ufound(const model_t *model);
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void uerror(const char *msg);
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void uprog(const poly_t gpoly, int flags, unsigned long seq);
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#endif /* REVENG_H */
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