[proxmark3-svn] / client / cmdcrc.c

//-----------------------------------------------------------------------------
// Copyright (C) 2015 iceman <iceman at iuse.se>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// CRC Calculations from the software reveng commands
//-----------------------------------------------------------------------------

#include <stdlib.h>
#ifdef _WIN32
#  include <io.h>
#  include <fcntl.h>
#  ifndef STDIN_FILENO
#    define STDIN_FILENO 0
#  endif /* STDIN_FILENO */
#endif /* _WIN32 */

#include <stdio.h>
#include <string.h>
//#include <stdlib.h>
//#include <ctype.h>
#include "cmdmain.h"
#include "cmdcrc.h"
#include "reveng/reveng.h"
#include "ui.h"
#include "util.h"

#define MAX_ARGS 20

int uerr(char *msg){
	PrintAndLog("%s",msg);
	return 0;
}

int split(char *str, char *arr[MAX_ARGS]){
	int beginIndex = 0;
	int endIndex;
	int maxWords = MAX_ARGS;
	int wordCnt = 0;

	while(1){
		while(isspace(str[beginIndex])){
			++beginIndex;
		}
		if(str[beginIndex] == '\0')
			break;
			endIndex = beginIndex;
		while (str[endIndex] && !isspace(str[endIndex])){
			++endIndex;
		}
		int len = endIndex - beginIndex;
		char *tmp = calloc(len + 1, sizeof(char));
		memcpy(tmp, &str[beginIndex], len);
		arr[wordCnt++] = tmp;
		//PrintAndLog("cnt: %d, %s",wordCnt-1, arr[wordCnt-1]);
		beginIndex = endIndex;
		if (wordCnt == maxWords)
			break;
	}
	return wordCnt;
}

int CmdCrc(const char *Cmd)
{
	char name[] = {"reveng "};
	char Cmd2[50 + 7];
	memcpy(Cmd2, name, 7);
	memcpy(Cmd2 + 7, Cmd, 50);
	char *argv[MAX_ARGS];
	int argc = split(Cmd2, argv);
	//PrintAndLog("argc: %d, %s %s Cmd: %s",argc, argv[0], Cmd2, Cmd);
	reveng_main(argc, argv);
	for(int i = 0; i < argc; ++i){
		//puts(arr[i]);
		free(argv[i]);
	}

	return 0;
}

int GetModels(char *Models[], int *count, uint32_t *width){
	/* default values */
	static model_t model = {
		PZERO,		/* no CRC polynomial, user must specify */
		PZERO,		/* Init = 0 */
		P_BE,		/* RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h */
		PZERO,		/* XorOut = 0 */
		PZERO,		/* check value unused */
		NULL		/* no model name */
	};

	int ibperhx = 8;//, obperhx = 8;
	int rflags = 0, uflags = 0; /* search and UI flags */
	poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL;
	model_t pset = model, *candmods, *mptr;

	/* stdin must be binary */
	#ifdef _WIN32
		_setmode(STDIN_FILENO, _O_BINARY);
	#endif /* _WIN32 */

	SETBMP();
	
	int args = 0, psets, pass;
	int Cnt = 0;
	if (*width == 0) { //reveng -D
		*count = mcount();
		if(!*count)
			return uerr("no preset models available");

		for(int mode = 0; mode < *count; ++mode) {
			mbynum(&model, mode);
			mcanon(&model);
			size_t size = (model.name && *model.name) ? strlen(model.name) : 6;
			char *tmp = calloc(size+1, sizeof(char));
			if (tmp==NULL)
				return uerr("out of memory?");

			memcpy(tmp, model.name, size);
			Models[mode] = tmp;
		}
		mfree(&model);
	} else { //reveng -s

		if(~model.flags & P_MULXN)
			return uerr("cannot search for non-Williams compliant models");

		praloc(&model.spoly, *width);
		praloc(&model.init, *width);
		praloc(&model.xorout, *width);
		if(!plen(model.spoly))
			palloc(&model.spoly, *width);
		else
			*width = plen(model.spoly);

		/* special case if qpoly is zero, search to end of range */
		if(!ptst(qpoly))
			rflags &= ~R_HAVEQ;


		/* not going to be sending additional args at this time (maybe future?)

		// allocate argument array 
		args = argc - optind;
		if(!(apolys = malloc(args * sizeof(poly_t))))
			return uerr("cannot allocate memory for argument list");

		for(pptr = apolys; optind < argc; ++optind) {
			if(uflags & C_INFILE)
				*pptr++ = rdpoly(argv[optind], model.flags, ibperhx);
			else
				*pptr++ = strtop(argv[optind], model.flags, ibperhx);
		}
		// exit value of pptr is used hereafter! 
	
		*/

		/* if endianness not specified, try
		 * little-endian then big-endian.
		 * NB: crossed-endian algorithms will not be
		 * searched.
		 */
		/* scan against preset models */
		if(~uflags & C_FORCE) {
			pass = 0;
			Cnt = 0;
			do {
				psets = mcount();
				//PrintAndLog("psets: %d",psets);
				while(psets) {
					mbynum(&pset, --psets);
					
					/* skip if different width, or refin or refout don't match */
					if(plen(pset.spoly) != *width || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT))
						continue;
					/* skip if the preset doesn't match specified parameters */
					if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly))
						continue;
					if(rflags & R_HAVEI && psncmp(&model.init, &pset.init))
						continue;
					if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout))
						continue;
			
					//for additional args (not used yet, maybe future?)
					apoly = pclone(pset.xorout);
					if(pset.flags & P_REFOUT)
						prev(&apoly);
					
					for(qptr = apolys; qptr < pptr; ++qptr) {
						crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0);
						if(ptst(crc)) {
							pfree(&crc);
							break;
						} else
							pfree(&crc);
					}
					pfree(&apoly);
					if(qptr == pptr) {

						/* the selected model solved all arguments */

						mcanon(&pset);
						
						size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 6;
						//PrintAndLog("Size: %d, %s, count: %d",size,pset.name, Cnt);
						char *tmp = calloc(size+1, sizeof(char));
						if (tmp==NULL){
							PrintAndLog("out of memory?");
							return 0;
						}
						memcpy(tmp, pset.name, size);
						Models[Cnt++] = tmp;
						*count = Cnt;
						uflags |= C_RESULT;
					}
				}
				mfree(&pset);

				/* toggle refIn/refOut and reflect arguments */
				if(~rflags & R_HAVERI) {
					model.flags ^= P_REFIN | P_REFOUT;
					for(qptr = apolys; qptr < pptr; ++qptr)
						prevch(qptr, ibperhx);
				}
			} while(~rflags & R_HAVERI && ++pass < 2);
		}
		//got everything now free the memory...

		if(uflags & C_RESULT) {
			for(qptr = apolys; qptr < pptr; ++qptr)
				pfree(qptr);
		}
		if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT))
			return uerr("cannot search for crossed-endian models");

		pass = 0;
		do {
			mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
			if(mptr && plen(mptr->spoly))
				uflags |= C_RESULT;
			while(mptr && plen(mptr->spoly)) {
				mfree(mptr++);
			}
			free(candmods);
			if(~rflags & R_HAVERI) {
				model.flags ^= P_REFIN | P_REFOUT;
				for(qptr = apolys; qptr < pptr; ++qptr)
					prevch(qptr, ibperhx);
			}
		} while(~rflags & R_HAVERI && ++pass < 2);
		for(qptr = apolys; qptr < pptr; ++qptr)
			pfree(qptr);
		free(apolys);
		if(~uflags & C_RESULT)
			return uerr("no models found");
		mfree(&model);
	}
	return 1;
}

//test call to GetModels
int CmdrevengTest(const char *Cmd){
	char *Models[80];
	int count = 0;
	uint32_t width = 0;
	width = param_get8(Cmd, 0);
	//PrintAndLog("width: %d",width);
	if (width > 89)
		return uerr("Width cannot exceed 89");

	int ans = GetModels(Models, &count, &width);
	if (!ans) return 0;
	
	PrintAndLog("Count: %d",count);
	for (int i = 0; i < count; i++){
		PrintAndLog("Model %d: %s",i,Models[i]);
		free(Models[i]);
	}
	return 1;
}

//-c || -v
//inModel = valid model name string - CRC-8
//inHexStr = input hex string to calculate crc on
//reverse = reverse calc option if true
//endian = {0 = calc default endian input and output, b = big endian input and output, B = big endian output, r = right justified
//          l = little endian input and output, L = little endian output only, t = left justified}
//result = calculated crc hex string
int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *result){
	/* default values */
	static model_t model = {
		PZERO,		// no CRC polynomial, user must specify
		PZERO,		// Init = 0
		P_BE,		  // RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h
		PZERO,		// XorOut = 0
		PZERO,		// check value unused 
		NULL		  // no model name 
	};
	int ibperhx = 8, obperhx = 8;
	int rflags = 0; // search flags 
	int c;
	unsigned long width = 0UL;
	poly_t apoly, crc;

	char *string;

	// stdin must be binary
	#ifdef _WIN32
		_setmode(STDIN_FILENO, _O_BINARY);
	#endif /* _WIN32 */

	SETBMP();
	//set model
	if(!(c = mbynam(&model, inModel))) {
		fprintf(stderr,"error: preset model '%s' not found.  Use reveng -D to list presets.\n", inModel);
		return 0;
	}
	if(c < 0)
		return uerr("no preset models available");

	// must set width so that parameter to -ipx is not zeroed 
	width = plen(model.spoly);
	rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX;
	
	//set flags
	switch (endian) {
		case 'b': /* b  big-endian (RefIn = false, RefOut = false ) */
			model.flags &= ~P_REFIN;
			rflags |= R_HAVERI;
			/* fall through: */
		case 'B': /* B  big-endian output (RefOut = false) */
			model.flags &= ~P_REFOUT;
			rflags |= R_HAVERO;
			mnovel(&model);
			/* fall through: */
		case 'r': /* r  right-justified */
			model.flags |= P_RTJUST;
			break;
		case 'l': /* l  little-endian input and output */
			model.flags |= P_REFIN;
			rflags |= R_HAVERI;
			/* fall through: */
		case 'L': /* L  little-endian output */
			model.flags |= P_REFOUT;
			rflags |= R_HAVERO;
			mnovel(&model);
			/* fall through: */
		case 't': /* t  left-justified */
			model.flags &= ~P_RTJUST;
			break;
	}

	mcanon(&model);

	if (reverse) {
		// v  calculate reversed CRC
		/* Distinct from the -V switch as this causes
		 * the arguments and output to be reversed as well.
		 */
		// reciprocate Poly
		prcp(&model.spoly);

		/* mrev() does:
		 *   if(refout) prev(init); else prev(xorout);
		 * but here the entire argument polynomial is
		 * reflected, not just the characters, so RefIn
		 * and RefOut are not inverted as with -V.
		 * Consequently Init is the mirror image of the
		 * one resulting from -V, and so we have:
		 */
		if(~model.flags & P_REFOUT) {
			prev(&model.init);
			prev(&model.xorout);
		}

		// swap init and xorout
		apoly = model.init;
		model.init = model.xorout;
		model.xorout = apoly;
	}
	// c  calculate CRC

	// validate inputs
	/* if(plen(model.spoly) == 0) {
	 *	fprintf(stderr,"%s: no polynomial specified for -%c (add -w WIDTH -p POLY)\n", myname, mode);
	 *	exit(EXIT_FAILURE);
	 * }
	 */

	/* in the Williams model, xorout is applied after the refout stage.
	 * as refout is part of ptostr(), we reverse xorout here.
	 */
	if(model.flags & P_REFOUT)
		prev(&model.xorout);

	apoly = strtop(inHexStr, model.flags, ibperhx);

	if(reverse)
		prev(&apoly);

	crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags);

	if(reverse)
		prev(&crc);

	string = ptostr(crc, model.flags, obperhx);
	for (int i = 0; i < 50; i++){
		result[i] = string[i];
		if (result[i]==0) break;
	}
	free(string);
	pfree(&crc);
	pfree(&apoly);
	return 1;
}

//test call to RunModel
int CmdrevengTestC(const char *Cmd){
	int cmdp = 0;
	char inModel[30] = {0x00};
	char inHexStr[30] = {0x00};
	char result[30];
	int dataLen;
	char endian = 0;
	dataLen = param_getstr(Cmd, cmdp++, inModel);
	if (dataLen < 4) return 0;
	dataLen = param_getstr(Cmd, cmdp++, inHexStr);
	if (dataLen < 4) return 0;
	bool reverse = (param_get8(Cmd, cmdp++)) ? true : false;
	endian = param_getchar(Cmd, cmdp++); 

	//PrintAndLog("mod: %s, hex: %s, rev %d", inModel, inHexStr, reverse);
	int ans = RunModel(inModel, inHexStr, reverse, endian, result);
	if (!ans) return 0;
	
	PrintAndLog("Result: %s",result);
	return 1;
}
Commit	Line	Data
fe81b478	1	//-----------------------------------------------------------------------------
	2	// Copyright (C) 2015 iceman <iceman at iuse.se>
	3	//
	4	// This code is licensed to you under the terms of the GNU GPL, version 2 or,
	5	// at your option, any later version. See the LICENSE.txt file for the text of
	6	// the license.
	7	//-----------------------------------------------------------------------------
	8	// CRC Calculations from the software reveng commands
	9	//-----------------------------------------------------------------------------
	10
7e599947	11	#include <stdlib.h>
	12	#ifdef _WIN32
	13	# include <io.h>
	14	# include <fcntl.h>
	15	# ifndef STDIN_FILENO
	16	# define STDIN_FILENO 0
	17	# endif /* STDIN_FILENO */
	18	#endif /* _WIN32 */
	19
fe81b478	20	#include <stdio.h>
fe81b478	21	#include <string.h>
f46c3663	22	//#include <stdlib.h>
f46c3663	23	//#include <ctype.h>
fe81b478	24	#include "cmdmain.h"
fe81b478	25	#include "cmdcrc.h"
fe81b478	26	#include "reveng/reveng.h"
f46c3663	27	#include "ui.h"
f46c3663	28	#include "util.h"
fe81b478	29
f46c3663	30	#define MAX_ARGS 20
fe81b478	31
2d3c535e	32	int uerr(char *msg){
	33	PrintAndLog("%s",msg);
	34	return 0;
	35	}
	36
f46c3663	37	int split(char str, char arr[MAX_ARGS]){
7e599947	38	int beginIndex = 0;
	39	int endIndex;
	40	int maxWords = MAX_ARGS;
	41	int wordCnt = 0;
fe81b478	42
7e599947	43	while(1){
	44	while(isspace(str[beginIndex])){
	45	++beginIndex;
	46	}
	47	if(str[beginIndex] == '\0')
	48	break;
	49	endIndex = beginIndex;
	50	while (str[endIndex] && !isspace(str[endIndex])){
	51	++endIndex;
	52	}
	53	int len = endIndex - beginIndex;
	54	char *tmp = calloc(len + 1, sizeof(char));
	55	memcpy(tmp, &str[beginIndex], len);
	56	arr[wordCnt++] = tmp;
	57	//PrintAndLog("cnt: %d, %s",wordCnt-1, arr[wordCnt-1]);
	58	beginIndex = endIndex;
	59	if (wordCnt == maxWords)
	60	break;
	61	}
	62	return wordCnt;
fe81b478	63	}
fe81b478	64
fe81b478	65	int CmdCrc(const char *Cmd)
fe81b478	66	{
f46c3663	67	char name[] = {"reveng "};
	68	char Cmd2[50 + 7];
	69	memcpy(Cmd2, name, 7);
	70	memcpy(Cmd2 + 7, Cmd, 50);
	71	char *argv[MAX_ARGS];
	72	int argc = split(Cmd2, argv);
	73	//PrintAndLog("argc: %d, %s %s Cmd: %s",argc, argv[0], Cmd2, Cmd);
	74	reveng_main(argc, argv);
	75	for(int i = 0; i < argc; ++i){
	76	//puts(arr[i]);
	77	free(argv[i]);
	78	}
fe81b478	79
f46c3663	80	return 0;
fe81b478	81	}
f46c3663	82
7e599947	83	int GetModels(char Models[], int count, uint32_t *width){
	84	/* default values */
	85	static model_t model = {
	86	PZERO, /* no CRC polynomial, user must specify */
	87	PZERO, /* Init = 0 */
	88	P_BE, /* RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h */
	89	PZERO, /* XorOut = 0 */
	90	PZERO, /* check value unused */
	91	NULL /* no model name */
	92	};
2e163546	93
2d3c535e	94	int ibperhx = 8;//, obperhx = 8;
2d3c535e	95	int rflags = 0, uflags = 0; /* search and UI flags */
2d3c535e	96	poly_t apoly, crc, qpoly = PZERO, apolys = NULL, pptr = NULL, *qptr = NULL;
2d3c535e	97	model_t pset = model, candmods, mptr;
7e599947	98
	99	/* stdin must be binary */
	100	#ifdef _WIN32
	101	_setmode(STDIN_FILENO, _O_BINARY);
	102	#endif /* _WIN32 */
	103
	104	SETBMP();
	105
2d3c535e	106	int args = 0, psets, pass;
2d3c535e	107	int Cnt = 0;
7e599947	108	if (*width == 0) { //reveng -D
7e599947	109	*count = mcount();
2d3c535e	110	if(!*count)
	111	return uerr("no preset models available");
	112
7e599947	113	for(int mode = 0; mode < *count; ++mode) {
	114	mbynum(&model, mode);
	115	mcanon(&model);
	116	size_t size = (model.name && *model.name) ? strlen(model.name) : 6;
7e599947	117	char *tmp = calloc(size+1, sizeof(char));
2d3c535e	118	if (tmp==NULL)
	119	return uerr("out of memory?");
	120
7e599947	121	memcpy(tmp, model.name, size);
7e599947	122	Models[mode] = tmp;
7e599947	123	}
2e163546	124	mfree(&model);
7e599947	125	} else { //reveng -s
7e599947	126
2e163546	127	if(~model.flags & P_MULXN)
2e163546	128	return uerr("cannot search for non-Williams compliant models");
2d3c535e	129
2e163546	130	praloc(&model.spoly, *width);
	131	praloc(&model.init, *width);
	132	praloc(&model.xorout, *width);
	133	if(!plen(model.spoly))
	134	palloc(&model.spoly, *width);
	135	else
	136	*width = plen(model.spoly);
2d3c535e	137
2e163546	138	/* special case if qpoly is zero, search to end of range */
	139	if(!ptst(qpoly))
	140	rflags &= ~R_HAVEQ;
2d3c535e	141
2d3c535e	142
2e163546	143	/* not going to be sending additional args at this time (maybe future?)
2d3c535e	144
2e163546	145	// allocate argument array
	146	args = argc - optind;
	147	if(!(apolys = malloc(args * sizeof(poly_t))))
	148	return uerr("cannot allocate memory for argument list");
2d3c535e	149
2e163546	150	for(pptr = apolys; optind < argc; ++optind) {
	151	if(uflags & C_INFILE)
	152	*pptr++ = rdpoly(argv[optind], model.flags, ibperhx);
	153	else
	154	*pptr++ = strtop(argv[optind], model.flags, ibperhx);
	155	}
	156	// exit value of pptr is used hereafter!
	157
	158	*/
2d3c535e	159
2e163546	160	/* if endianness not specified, try
	161	* little-endian then big-endian.
	162	* NB: crossed-endian algorithms will not be
	163	* searched.
	164	*/
	165	/* scan against preset models */
	166	if(~uflags & C_FORCE) {
	167	pass = 0;
	168	Cnt = 0;
	169	do {
	170	psets = mcount();
	171	//PrintAndLog("psets: %d",psets);
	172	while(psets) {
	173	mbynum(&pset, --psets);
	174
	175	/* skip if different width, or refin or refout don't match */
	176	if(plen(pset.spoly) != *width \|\| (model.flags ^ pset.flags) & (P_REFIN \| P_REFOUT))
	177	continue;
	178	/* skip if the preset doesn't match specified parameters */
	179	if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly))
	180	continue;
	181	if(rflags & R_HAVEI && psncmp(&model.init, &pset.init))
	182	continue;
	183	if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout))
	184	continue;
	185
	186	//for additional args (not used yet, maybe future?)
	187	apoly = pclone(pset.xorout);
	188	if(pset.flags & P_REFOUT)
	189	prev(&apoly);
	190
	191	for(qptr = apolys; qptr < pptr; ++qptr) {
	192	crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0);
	193	if(ptst(crc)) {
	194	pfree(&crc);
	195	break;
	196	} else
	197	pfree(&crc);
2d3c535e	198	}
2e163546	199	pfree(&apoly);
	200	if(qptr == pptr) {
	201
	202	/* the selected model solved all arguments */
2d3c535e	203
2e163546	204	mcanon(&pset);
	205
	206	size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 6;
	207	//PrintAndLog("Size: %d, %s, count: %d",size,pset.name, Cnt);
	208	char *tmp = calloc(size+1, sizeof(char));
	209	if (tmp==NULL){
	210	PrintAndLog("out of memory?");
	211	return 0;
	212	}
	213	memcpy(tmp, pset.name, size);
	214	Models[Cnt++] = tmp;
	215	*count = Cnt;
	216	uflags \|= C_RESULT;
2d3c535e	217	}
2d3c535e	218	}
2e163546	219	mfree(&pset);
	220
	221	/* toggle refIn/refOut and reflect arguments */
2d3c535e	222	if(~rflags & R_HAVERI) {
	223	model.flags ^= P_REFIN \| P_REFOUT;
	224	for(qptr = apolys; qptr < pptr; ++qptr)
	225	prevch(qptr, ibperhx);
	226	}
	227	} while(~rflags & R_HAVERI && ++pass < 2);
2e163546	228	}
	229	//got everything now free the memory...
	230
	231	if(uflags & C_RESULT) {
2d3c535e	232	for(qptr = apolys; qptr < pptr; ++qptr)
2d3c535e	233	pfree(qptr);
2e163546	234	}
	235	if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT))
	236	return uerr("cannot search for crossed-endian models");
2d3c535e	237
2e163546	238	pass = 0;
	239	do {
	240	mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
	241	if(mptr && plen(mptr->spoly))
	242	uflags \|= C_RESULT;
	243	while(mptr && plen(mptr->spoly)) {
	244	mfree(mptr++);
	245	}
	246	free(candmods);
	247	if(~rflags & R_HAVERI) {
	248	model.flags ^= P_REFIN \| P_REFOUT;
	249	for(qptr = apolys; qptr < pptr; ++qptr)
	250	prevch(qptr, ibperhx);
	251	}
	252	} while(~rflags & R_HAVERI && ++pass < 2);
	253	for(qptr = apolys; qptr < pptr; ++qptr)
	254	pfree(qptr);
	255	free(apolys);
	256	if(~uflags & C_RESULT)
	257	return uerr("no models found");
	258	mfree(&model);
7e599947	259	}
7e599947	260	return 1;
	261	}
	262
	263	//test call to GetModels
	264	int CmdrevengTest(const char *Cmd){
	265	char *Models[80];
	266	int count = 0;
	267	uint32_t width = 0;
2d3c535e	268	width = param_get8(Cmd, 0);
	269	//PrintAndLog("width: %d",width);
	270	if (width > 89)
	271	return uerr("Width cannot exceed 89");
	272
7e599947	273	int ans = GetModels(Models, &count, &width);
	274	if (!ans) return 0;
	275
	276	PrintAndLog("Count: %d",count);
	277	for (int i = 0; i < count; i++){
	278	PrintAndLog("Model %d: %s",i,Models[i]);
	279	free(Models[i]);
	280	}
	281	return 1;
	282	}
37f4270a	283
37f4270a	284	//-c \|\| -v
7a23fca1	285	//inModel = valid model name string - CRC-8
	286	//inHexStr = input hex string to calculate crc on
	287	//reverse = reverse calc option if true
	288	//endian = {0 = calc default endian input and output, b = big endian input and output, B = big endian output, r = right justified
	289	// l = little endian input and output, L = little endian output only, t = left justified}
	290	//result = calculated crc hex string
	291	int RunModel(char inModel, char inHexStr, bool reverse, char endian, char *result){
37f4270a	292	/* default values */
	293	static model_t model = {
	294	PZERO, // no CRC polynomial, user must specify
	295	PZERO, // Init = 0
	296	P_BE, // RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h
	297	PZERO, // XorOut = 0
	298	PZERO, // check value unused
	299	NULL // no model name
	300	};
	301	int ibperhx = 8, obperhx = 8;
	302	int rflags = 0; // search flags
	303	int c;
	304	unsigned long width = 0UL;
	305	poly_t apoly, crc;
	306
	307	char *string;
	308
	309	// stdin must be binary
	310	#ifdef _WIN32
	311	_setmode(STDIN_FILENO, _O_BINARY);
	312	#endif /* _WIN32 */
	313
	314	SETBMP();
	315	//set model
	316	if(!(c = mbynam(&model, inModel))) {
	317	fprintf(stderr,"error: preset model '%s' not found. Use reveng -D to list presets.\n", inModel);
	318	return 0;
	319	}
	320	if(c < 0)
	321	return uerr("no preset models available");
	322
	323	// must set width so that parameter to -ipx is not zeroed
	324	width = plen(model.spoly);
	325	rflags \|= R_HAVEP \| R_HAVEI \| R_HAVERI \| R_HAVERO \| R_HAVEX;
	326
7a23fca1	327	//set flags
	328	switch (endian) {
	329	case 'b': /* b big-endian (RefIn = false, RefOut = false ) */
	330	model.flags &= ~P_REFIN;
	331	rflags \|= R_HAVERI;
	332	/* fall through: */
	333	case 'B': /* B big-endian output (RefOut = false) */
	334	model.flags &= ~P_REFOUT;
	335	rflags \|= R_HAVERO;
	336	mnovel(&model);
	337	/* fall through: */
	338	case 'r': /* r right-justified */
	339	model.flags \|= P_RTJUST;
	340	break;
	341	case 'l': /* l little-endian input and output */
	342	model.flags \|= P_REFIN;
	343	rflags \|= R_HAVERI;
	344	/* fall through: */
	345	case 'L': /* L little-endian output */
	346	model.flags \|= P_REFOUT;
	347	rflags \|= R_HAVERO;
	348	mnovel(&model);
	349	/* fall through: */
	350	case 't': /* t left-justified */
	351	model.flags &= ~P_RTJUST;
	352	break;
	353	}
	354
37f4270a	355	mcanon(&model);
	356
	357	if (reverse) {
	358	// v calculate reversed CRC
	359	/* Distinct from the -V switch as this causes
	360	* the arguments and output to be reversed as well.
	361	*/
	362	// reciprocate Poly
	363	prcp(&model.spoly);
	364
	365	/* mrev() does:
	366	* if(refout) prev(init); else prev(xorout);
	367	* but here the entire argument polynomial is
	368	* reflected, not just the characters, so RefIn
	369	* and RefOut are not inverted as with -V.
	370	* Consequently Init is the mirror image of the
	371	* one resulting from -V, and so we have:
	372	*/
	373	if(~model.flags & P_REFOUT) {
	374	prev(&model.init);
	375	prev(&model.xorout);
	376	}
	377
	378	// swap init and xorout
	379	apoly = model.init;
	380	model.init = model.xorout;
	381	model.xorout = apoly;
	382	}
	383	// c calculate CRC
	384
	385	// validate inputs
	386	/* if(plen(model.spoly) == 0) {
	387	* fprintf(stderr,"%s: no polynomial specified for -%c (add -w WIDTH -p POLY)\n", myname, mode);
	388	* exit(EXIT_FAILURE);
	389	* }
	390	*/
	391
	392	/* in the Williams model, xorout is applied after the refout stage.
	393	* as refout is part of ptostr(), we reverse xorout here.
	394	*/
	395	if(model.flags & P_REFOUT)
	396	prev(&model.xorout);
	397
	398	apoly = strtop(inHexStr, model.flags, ibperhx);
	399
	400	if(reverse)
	401	prev(&apoly);
	402
	403	crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags);
	404
	405	if(reverse)
	406	prev(&crc);
	407
	408	string = ptostr(crc, model.flags, obperhx);
	409	for (int i = 0; i < 50; i++){
	410	result[i] = string[i];
	411	if (result[i]==0) break;
	412	}
	413	free(string);
	414	pfree(&crc);
	415	pfree(&apoly);
	416	return 1;
	417	}
	418
419	//test call to RunModel
420	int CmdrevengTestC(const char *Cmd){
421	int cmdp = 0;
422	char inModel[30] = {0x00};
423	char inHexStr[30] = {0x00};
424	char result[30];
425	int dataLen;
7a23fca1	426	char endian = 0;
37f4270a	427	dataLen = param_getstr(Cmd, cmdp++, inModel);
	428	if (dataLen < 4) return 0;
	429	dataLen = param_getstr(Cmd, cmdp++, inHexStr);
	430	if (dataLen < 4) return 0;
7a23fca1	431	bool reverse = (param_get8(Cmd, cmdp++)) ? true : false;
7a23fca1	432	endian = param_getchar(Cmd, cmdp++);
37f4270a	433
37f4270a	434	//PrintAndLog("mod: %s, hex: %s, rev %d", inModel, inHexStr, reverse);
7a23fca1	435	int ans = RunModel(inModel, inHexStr, reverse, endian, result);
37f4270a	436	if (!ans) return 0;
	437
	438	PrintAndLog("Result: %s",result);
	439	return 1;
	440	}