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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
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
20 #include <stdio.h>
21 #include <string.h>
22 //#include <stdlib.h>
23 //#include <ctype.h>
24 #include "cmdmain.h"
25 #include "cmdcrc.h"
26 #include "reveng/reveng.h"
27 #include "ui.h"
28 #include "util.h"
29
30 #define MAX_ARGS 20
31
32 int uerr(char *msg){
33 PrintAndLog("%s",msg);
34 return 0;
35 }
36
37 int split(char *str, char *arr[MAX_ARGS]){
38 int beginIndex = 0;
39 int endIndex;
40 int maxWords = MAX_ARGS;
41 int wordCnt = 0;
42
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;
63 }
64
65 int CmdCrc(const char *Cmd)
66 {
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
74 if (argc == 3 && memcmp(argv[1],"-g",2)==0) {
75 CmdrevengSearch(argv[2]);
76 } else {
77 reveng_main(argc, argv);
78 }
79 //PrintAndLog("DEBUG argc: %d, %s %s Cmd: %s",argc, argv[0], Cmd2, Cmd);
80 for(int i = 0; i < argc; ++i){
81 free(argv[i]);
82 }
83
84 return 0;
85 }
86
87 //returns array of model names and the count of models returning
88 // as well as a width array for the width of each model
89 int GetModels(char *Models[], int *count, uint8_t *width){
90 /* default values */
91 static model_t model = {
92 PZERO, /* no CRC polynomial, user must specify */
93 PZERO, /* Init = 0 */
94 P_BE, /* RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h */
95 PZERO, /* XorOut = 0 */
96 PZERO, /* check value unused */
97 NULL /* no model name */
98 };
99
100 int ibperhx = 8;//, obperhx = 8;
101 int rflags = 0, uflags = 0; /* search and UI flags */
102 poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL;
103 model_t pset = model, *candmods, *mptr;
104
105 /* stdin must be binary */
106 #ifdef _WIN32
107 _setmode(STDIN_FILENO, _O_BINARY);
108 #endif /* _WIN32 */
109
110 SETBMP();
111
112 int args = 0, psets, pass;
113 int Cnt = 0;
114 if (width[0] == 0) { //reveng -D
115 *count = mcount();
116 if(!*count)
117 return uerr("no preset models available");
118
119 for(int mode = 0; mode < *count; ++mode) {
120 mbynum(&model, mode);
121 mcanon(&model);
122 size_t size = (model.name && *model.name) ? strlen(model.name) : 6;
123 char *tmp = calloc(size+1, sizeof(char));
124 if (tmp==NULL)
125 return uerr("out of memory?");
126
127 memcpy(tmp, model.name, size);
128 Models[mode] = tmp;
129 width[mode] = plen(model.spoly);
130 }
131 mfree(&model);
132 } else { //reveng -s
133
134 if(~model.flags & P_MULXN)
135 return uerr("cannot search for non-Williams compliant models");
136
137 praloc(&model.spoly, (unsigned long)width[0]);
138 praloc(&model.init, (unsigned long)width[0]);
139 praloc(&model.xorout, (unsigned long)width[0]);
140 if(!plen(model.spoly))
141 palloc(&model.spoly, (unsigned long)width[0]);
142 else
143 width[0] = (uint8_t)plen(model.spoly);
144
145 /* special case if qpoly is zero, search to end of range */
146 if(!ptst(qpoly))
147 rflags &= ~R_HAVEQ;
148
149 /* if endianness not specified, try
150 * little-endian then big-endian.
151 * NB: crossed-endian algorithms will not be
152 * searched.
153 */
154 /* scan against preset models */
155 if(~uflags & C_FORCE) {
156 pass = 0;
157 Cnt = 0;
158 do {
159 psets = mcount();
160
161 while(psets) {
162 mbynum(&pset, --psets);
163
164 /* skip if different width, or refin or refout don't match */
165 if(plen(pset.spoly) != width[0] || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT))
166 continue;
167 /* skip if the preset doesn't match specified parameters */
168 if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly))
169 continue;
170 if(rflags & R_HAVEI && psncmp(&model.init, &pset.init))
171 continue;
172 if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout))
173 continue;
174
175 //for additional args (not used yet, maybe future?)
176 apoly = pclone(pset.xorout);
177 if(pset.flags & P_REFOUT)
178 prev(&apoly);
179
180 for(qptr = apolys; qptr < pptr; ++qptr) {
181 crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0);
182 if(ptst(crc)) {
183 pfree(&crc);
184 break;
185 } else
186 pfree(&crc);
187 }
188 pfree(&apoly);
189 if(qptr == pptr) {
190
191 /* the selected model solved all arguments */
192
193 mcanon(&pset);
194
195 size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 6;
196 //PrintAndLog("Size: %d, %s, count: %d",size,pset.name, Cnt);
197 char *tmp = calloc(size+1, sizeof(char));
198 if (tmp == NULL){
199 PrintAndLog("out of memory?");
200 return 0;
201 }
202 width[Cnt] = width[0];
203 memcpy(tmp, pset.name, size);
204 Models[Cnt++] = tmp;
205 *count = Cnt;
206 uflags |= C_RESULT;
207 }
208 }
209 mfree(&pset);
210
211 /* toggle refIn/refOut and reflect arguments */
212 if(~rflags & R_HAVERI) {
213 model.flags ^= P_REFIN | P_REFOUT;
214 for(qptr = apolys; qptr < pptr; ++qptr)
215 prevch(qptr, ibperhx);
216 }
217 } while(~rflags & R_HAVERI && ++pass < 2);
218 }
219 //got everything now free the memory...
220
221 if(uflags & C_RESULT) {
222 for(qptr = apolys; qptr < pptr; ++qptr)
223 pfree(qptr);
224 }
225 if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT))
226 return uerr("cannot search for crossed-endian models");
227
228 pass = 0;
229 do {
230 mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
231 if(mptr && plen(mptr->spoly))
232 uflags |= C_RESULT;
233 while(mptr && plen(mptr->spoly)) {
234 mfree(mptr++);
235 }
236 free(candmods);
237 if(~rflags & R_HAVERI) {
238 model.flags ^= P_REFIN | P_REFOUT;
239 for(qptr = apolys; qptr < pptr; ++qptr)
240 prevch(qptr, ibperhx);
241 }
242 } while(~rflags & R_HAVERI && ++pass < 2);
243 for(qptr = apolys; qptr < pptr; ++qptr)
244 pfree(qptr);
245 free(apolys);
246 if(~uflags & C_RESULT)
247 return uerr("no models found");
248 mfree(&model);
249
250 }
251 return 1;
252 }
253
254 //-c || -v
255 //inModel = valid model name string - CRC-8
256 //inHexStr = input hex string to calculate crc on
257 //reverse = reverse calc option if true
258 //endian = {0 = calc default endian input and output, b = big endian input and output, B = big endian output, r = right justified
259 // l = little endian input and output, L = little endian output only, t = left justified}
260 //result = calculated crc hex string
261 int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *result){
262 /* default values */
263 static model_t model = {
264 PZERO, // no CRC polynomial, user must specify
265 PZERO, // Init = 0
266 P_BE, // RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h
267 PZERO, // XorOut = 0
268 PZERO, // check value unused
269 NULL // no model name
270 };
271 int ibperhx = 8, obperhx = 8;
272 int rflags = 0; // search flags
273 int c;
274 poly_t apoly, crc;
275
276 char *string;
277
278 // stdin must be binary
279 #ifdef _WIN32
280 _setmode(STDIN_FILENO, _O_BINARY);
281 #endif /* _WIN32 */
282
283 SETBMP();
284 //set model
285 if(!(c = mbynam(&model, inModel))) {
286 PrintAndLog("error: preset model '%s' not found. Use reveng -D to list presets.", inModel);
287 return 0;
288 }
289 if(c < 0)
290 return uerr("no preset models available");
291
292 rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX;
293
294 //set flags
295 switch (endian) {
296 case 'b': /* b big-endian (RefIn = false, RefOut = false ) */
297 model.flags &= ~P_REFIN;
298 rflags |= R_HAVERI;
299 /* fall through: */
300 case 'B': /* B big-endian output (RefOut = false) */
301 model.flags &= ~P_REFOUT;
302 rflags |= R_HAVERO;
303 mnovel(&model);
304 /* fall through: */
305 case 'r': /* r right-justified */
306 model.flags |= P_RTJUST;
307 break;
308 case 'l': /* l little-endian input and output */
309 model.flags |= P_REFIN;
310 rflags |= R_HAVERI;
311 /* fall through: */
312 case 'L': /* L little-endian output */
313 model.flags |= P_REFOUT;
314 rflags |= R_HAVERO;
315 mnovel(&model);
316 /* fall through: */
317 case 't': /* t left-justified */
318 model.flags &= ~P_RTJUST;
319 break;
320 }
321
322 mcanon(&model);
323
324 if (reverse) {
325 // v calculate reversed CRC
326 /* Distinct from the -V switch as this causes
327 * the arguments and output to be reversed as well.
328 */
329 // reciprocate Poly
330 prcp(&model.spoly);
331
332 /* mrev() does:
333 * if(refout) prev(init); else prev(xorout);
334 * but here the entire argument polynomial is
335 * reflected, not just the characters, so RefIn
336 * and RefOut are not inverted as with -V.
337 * Consequently Init is the mirror image of the
338 * one resulting from -V, and so we have:
339 */
340 if(~model.flags & P_REFOUT) {
341 prev(&model.init);
342 prev(&model.xorout);
343 }
344
345 // swap init and xorout
346 apoly = model.init;
347 model.init = model.xorout;
348 model.xorout = apoly;
349 }
350 // c calculate CRC
351
352 /* in the Williams model, xorout is applied after the refout stage.
353 * as refout is part of ptostr(), we reverse xorout here.
354 */
355 if(model.flags & P_REFOUT)
356 prev(&model.xorout);
357
358 apoly = strtop(inHexStr, model.flags, ibperhx);
359
360 if(reverse)
361 prev(&apoly);
362
363 crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags);
364
365 if(reverse)
366 prev(&crc);
367
368 string = ptostr(crc, model.flags, obperhx);
369 for (int i = 0; i < 50; i++){
370 result[i] = string[i];
371 if (result[i]==0) break;
372 }
373 free(string);
374 pfree(&crc);
375 pfree(&apoly);
376 return 1;
377 }
378 //returns a calloced string (needs to be freed)
379 char *SwapEndianStr(const char *inStr, const size_t len, const uint8_t blockSize){
380 char *tmp = calloc(len+1, sizeof(char));
381 for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
382 for (size_t i = 0; i < blockSize; i+=2){
383 tmp[i+(blockSize*block)] = inStr[(blockSize-1-i-1)+(blockSize*block)];
384 tmp[i+(blockSize*block)+1] = inStr[(blockSize-1-i)+(blockSize*block)];
385 }
386 }
387 return tmp;
388 }
389
390 // takes hex string in and searches for a matching result (hex string must include checksum)
391 int CmdrevengSearch(const char *Cmd){
392 char inHexStr[50] = {0x00};
393 int dataLen = param_getstr(Cmd, 0, inHexStr);
394 if (dataLen < 4) return 0;
395
396 char *Models[80];
397 int count = 0;
398 uint8_t width[80];
399 width[0] = 0;
400 uint8_t crcChars = 0;
401 char result[30];
402 char revResult[30];
403 int ans = GetModels(Models, &count, width);
404 bool found = false;
405 if (!ans) return 0;
406
407 // try each model and get result
408 for (int i = 0; i < count; i++){
409 /*if (found) {
410 free(Models[i]);
411 continue;
412 }*/
413 // round up to # of characters in this model's crc
414 crcChars = ((width[i]+7)/8)*2;
415 // can't test a model that has more crc digits than our data
416 if (crcChars >= dataLen)
417 continue;
418 memset(result, 0, 30);
419 char *inCRC = calloc(crcChars+1, sizeof(char));
420 memcpy(inCRC, inHexStr+(dataLen-crcChars), crcChars);
421
422 char *outHex = calloc(dataLen-crcChars+1, sizeof(char));
423 memcpy(outHex, inHexStr, dataLen-crcChars);
424
425 //PrintAndLog("DEBUG: dataLen: %d, crcChars: %d, Model: %s, CRC: %s, width: %d, outHex: %s",dataLen, crcChars, Models[i], inCRC, width[i], outHex);
426 ans = RunModel(Models[i], outHex, false, 0, result);
427 if (ans) {
428 //test for match
429 if (memcmp(result, inCRC, crcChars)==0){
430 PrintAndLog("\nFound a possible match!\nModel: %s\nValue: %s\n",Models[i], result);
431 //optional - stop searching if found...
432 found = true;
433 } else {
434 if (crcChars > 2){
435 char *swapEndian = SwapEndianStr(result, crcChars, crcChars);
436 if (memcmp(swapEndian, inCRC, crcChars)==0){
437 PrintAndLog("\nFound a possible match!\nModel: %s\nValue EndianSwapped: %s\n",Models[i], swapEndian);
438 //optional - stop searching if found...
439 found = true;
440 }
441 free(swapEndian);
442 }
443 }
444 }
445
446 //if (!found){
447 ans = RunModel(Models[i], outHex, true, 0, revResult);
448 if (ans) {
449 //test for match
450 if (memcmp(revResult, inCRC, crcChars)==0){
451 PrintAndLog("\nFound a possible match!\nModel Reversed: %s\nValue: %s\n",Models[i], revResult);
452 //optional - stop searching if found...
453 found = true;
454 } else {
455 if (crcChars > 2){
456 char *swapEndian = SwapEndianStr(revResult, crcChars, crcChars);
457 if (memcmp(swapEndian, inCRC, crcChars)==0){
458 PrintAndLog("\nFound a possible match!\nModel Reversed: %s\nValue EndianSwapped: %s\n",Models[i], swapEndian);
459 //optional - stop searching if found...
460 found = true;
461 }
462 free(swapEndian);
463 }
464 }
465 }
466 //}
467 free(inCRC);
468 free(outHex);
469 free(Models[i]);
470 }
471 if (!found) PrintAndLog("\nNo matches found\n");
472 return 1;
473 }
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