git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdcrc.c

   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                 }
  50                 endIndex = beginIndex;
  51                 while (str[endIndex] && !isspace(str[endIndex])){
  52                         ++endIndex;
  53                 }
  54                 int len = endIndex - beginIndex;
  55                 char *tmp = calloc(len + 1, sizeof(char));
  56                 memcpy(tmp, &str[beginIndex], len);
  57                 arr[wordCnt++] = tmp;
  58                 //PrintAndLog("DEBUG cnt: %d, %s",wordCnt-1, arr[wordCnt-1]);
  59                 beginIndex = endIndex;
  60                 if (wordCnt == maxWords)
  61                         break;
  62         }
  63         return wordCnt;
  64 }
  65
  66 int CmdCrc(const char *Cmd)
  67 {
  68         char name[] = {"reveng "};
  69         char Cmd2[50 + 7];
  70         memcpy(Cmd2, name, 7);
  71         memcpy(Cmd2 + 7, Cmd, 50);
  72         char *argv[MAX_ARGS];
  73         int argc = split(Cmd2, argv);
  74
  75         if (argc == 3 && memcmp(argv[1],"-g",2)==0) {
  76                 CmdrevengSearch(argv[2]);
  77         } else {
  78                 reveng_main(argc, argv);
  79         }
  80         //PrintAndLog("DEBUG argc: %d, %s %s Cmd: %s",argc, argv[0], Cmd2, Cmd);
  81         for(int i = 0; i < argc; ++i){
  82                 free(argv[i]);
  83         }
  84
  85         return 0;
  86 }
  87
  88 //returns array of model names and the count of models returning
  89 //  as well as a width array for the width of each model
  90 int GetModels(char *Models[], int *count, uint8_t *width){
  91         /* default values */
  92         static model_t model = {
  93                 PZERO,          /* no CRC polynomial, user must specify */
  94                 PZERO,          /* Init = 0 */
  95                 P_BE,           /* RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h */
  96                 PZERO,          /* XorOut = 0 */
  97                 PZERO,          /* check value unused */
  98                 NULL            /* no model name */
  99         };
 100
 101         int ibperhx = 8;//, obperhx = 8;
 102         int rflags = 0, uflags = 0; /* search and UI flags */
 103         poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL;
 104         model_t pset = model, *candmods, *mptr;
 105
 106         /* stdin must be binary */
 107         #ifdef _WIN32
 108                 _setmode(STDIN_FILENO, _O_BINARY);
 109         #endif /* _WIN32 */
 110
 111         SETBMP();
 112
 113         int args = 0, psets, pass;
 114         int Cnt = 0;
 115         if (width[0] == 0) { //reveng -D
 116                 *count = mcount();
 117                 if(!*count)
 118                         return uerr("no preset models available");
 119
 120                 for(int mode = 0; mode < *count; ++mode) {
 121                         mbynum(&model, mode);
 122                         mcanon(&model);
 123                         size_t size = (model.name && *model.name) ? strlen(model.name) : 6;
 124                         char *tmp = calloc(size+1, sizeof(char));
 125                         if (tmp==NULL)
 126                                 return uerr("out of memory?");
 127
 128                         memcpy(tmp, model.name, size);
 129                         Models[mode] = tmp;
 130                         width[mode] = plen(model.spoly);
 131                 }
 132                 mfree(&model);
 133         } else { //reveng -s
 134
 135                 if(~model.flags & P_MULXN)
 136                         return uerr("cannot search for non-Williams compliant models");
 137
 138                 praloc(&model.spoly, (unsigned long)width[0]);
 139                 praloc(&model.init, (unsigned long)width[0]);
 140                 praloc(&model.xorout, (unsigned long)width[0]);
 141                 if(!plen(model.spoly))
 142                         palloc(&model.spoly, (unsigned long)width[0]);
 143                 else
 144                         width[0] = (uint8_t)plen(model.spoly);
 145
 146                 /* special case if qpoly is zero, search to end of range */
 147                 if(!ptst(qpoly))
 148                         rflags &= ~R_HAVEQ;
 149
 150
 151                 /* not going to be sending additional args at this time (maybe future?)
 152
 153                 // allocate argument array
 154                 args = argc - optind;
 155                 if(!(apolys = malloc(args * sizeof(poly_t))))
 156                         return uerr("cannot allocate memory for argument list");
 157
 158                 for(pptr = apolys; optind < argc; ++optind) {
 159                         if(uflags & C_INFILE)
 160                                 *pptr++ = rdpoly(argv[optind], model.flags, ibperhx);
 161                         else
 162                                 *pptr++ = strtop(argv[optind], model.flags, ibperhx);
 163                 }
 164                 // exit value of pptr is used hereafter!
 165
 166                 */
 167
 168                 /* if endianness not specified, try
 169                  * little-endian then big-endian.
 170                  * NB: crossed-endian algorithms will not be
 171                  * searched.
 172                  */
 173                 /* scan against preset models */
 174                 if(~uflags & C_FORCE) {
 175                         pass = 0;
 176                         Cnt = 0;
 177                         do {
 178                                 psets = mcount();
 179                                 //PrintAndLog("psets: %d",psets);
 180                                 while(psets) {
 181                                         mbynum(&pset, --psets);
 182
 183                                         /* skip if different width, or refin or refout don't match */
 184                                         if(plen(pset.spoly) != width[0] || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT))
 185                                                 continue;
 186                                         /* skip if the preset doesn't match specified parameters */
 187                                         if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly))
 188                                                 continue;
 189                                         if(rflags & R_HAVEI && psncmp(&model.init, &pset.init))
 190                                                 continue;
 191                                         if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout))
 192                                                 continue;
 193
 194                                         //for additional args (not used yet, maybe future?)
 195                                         apoly = pclone(pset.xorout);
 196                                         if(pset.flags & P_REFOUT)
 197                                                 prev(&apoly);
 198
 199                                         for(qptr = apolys; qptr < pptr; ++qptr) {
 200                                                 crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0);
 201                                                 if(ptst(crc)) {
 202                                                         pfree(&crc);
 203                                                         break;
 204                                                 } else
 205                                                         pfree(&crc);
 206                                         }
 207                                         pfree(&apoly);
 208                                         if(qptr == pptr) {
 209
 210                                                 /* the selected model solved all arguments */
 211
 212                                                 mcanon(&pset);
 213
 214                                                 size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 6;
 215                                                 //PrintAndLog("Size: %d, %s, count: %d",size,pset.name, Cnt);
 216                                                 char *tmp = calloc(size+1, sizeof(char));
 217                                                 if (tmp==NULL){
 218                                                         PrintAndLog("out of memory?");
 219                                                         return 0;
 220                                                 }
 221                                                 width[Cnt] = width[0];
 222                                                 memcpy(tmp, pset.name, size);
 223                                                 Models[Cnt++] = tmp;
 224                                                 *count = Cnt;
 225                                                 uflags |= C_RESULT;
 226                                         }
 227                                 }
 228                                 mfree(&pset);
 229
 230                                 /* toggle refIn/refOut and reflect arguments */
 231                                 if(~rflags & R_HAVERI) {
 232                                         model.flags ^= P_REFIN | P_REFOUT;
 233                                         for(qptr = apolys; qptr < pptr; ++qptr)
 234                                                 prevch(qptr, ibperhx);
 235                                 }
 236                         } while(~rflags & R_HAVERI && ++pass < 2);
 237                 }
 238                 //got everything now free the memory...
 239
 240                 if(uflags & C_RESULT) {
 241                         for(qptr = apolys; qptr < pptr; ++qptr)
 242                                 pfree(qptr);
 243                 }
 244                 if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT))
 245                         return uerr("cannot search for crossed-endian models");
 246
 247                 pass = 0;
 248                 do {
 249                         mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
 250                         if(mptr && plen(mptr->spoly))
 251                                 uflags |= C_RESULT;
 252                         while(mptr && plen(mptr->spoly)) {
 253                                 mfree(mptr++);
 254                         }
 255                         free(candmods);
 256                         if(~rflags & R_HAVERI) {
 257                                 model.flags ^= P_REFIN | P_REFOUT;
 258                                 for(qptr = apolys; qptr < pptr; ++qptr)
 259                                         prevch(qptr, ibperhx);
 260                         }
 261                 } while(~rflags & R_HAVERI && ++pass < 2);
 262                 for(qptr = apolys; qptr < pptr; ++qptr)
 263                         pfree(qptr);
 264                 free(apolys);
 265                 if(~uflags & C_RESULT)
 266                         return uerr("no models found");
 267                 mfree(&model);
 268         }
 269         return 1;
 270 }
 271
 272 //test call to GetModels
 273 int CmdrevengTest(const char *Cmd){
 274         char *Models[80];
 275         int count = 0;
 276         uint8_t widtharr[80] = {0};
 277         uint8_t width = 0;
 278         width = param_get8(Cmd, 0);
 279         //PrintAndLog("width: %d",width);
 280         if (width > 89)
 281                 return uerr("Width cannot exceed 89");
 282
 283         widtharr[0] = width;
 284         int ans = GetModels(Models, &count, widtharr);
 285         if (!ans) return 0;
 286
 287         PrintAndLog("Count: %d",count);
 288         for (int i = 0; i < count; i++){
 289                 PrintAndLog("Model %d: %s, width: %d",i,Models[i], widtharr[i]);
 290                 free(Models[i]);
 291         }
 292         return 1;
 293 }
 294
 295 //-c || -v
 296 //inModel = valid model name string - CRC-8
 297 //inHexStr = input hex string to calculate crc on
 298 //reverse = reverse calc option if true
 299 //endian = {0 = calc default endian input and output, b = big endian input and output, B = big endian output, r = right justified
 300 //          l = little endian input and output, L = little endian output only, t = left justified}
 301 //result = calculated crc hex string
 302 int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *result){
 303         /* default values */
 304         static model_t model = {
 305                 PZERO,          // no CRC polynomial, user must specify
 306                 PZERO,          // Init = 0
 307                 P_BE,             // RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h
 308                 PZERO,          // XorOut = 0
 309                 PZERO,          // check value unused
 310                 NULL              // no model name
 311         };
 312         int ibperhx = 8, obperhx = 8;
 313         int rflags = 0; // search flags
 314         int c;
 315         //unsigned long width;
 316         poly_t apoly, crc;
 317
 318         char *string;
 319
 320         // stdin must be binary
 321         #ifdef _WIN32
 322                 _setmode(STDIN_FILENO, _O_BINARY);
 323         #endif /* _WIN32 */
 324
 325         SETBMP();
 326         //set model
 327         if(!(c = mbynam(&model, inModel))) {
 328                 fprintf(stderr,"error: preset model '%s' not found.  Use reveng -D to list presets.\n", inModel);
 329                 return 0;
 330         }
 331         if(c < 0)
 332                 return uerr("no preset models available");
 333
 334         // must set width so that parameter to -ipx is not zeroed
 335         //width = plen(model.spoly);
 336         rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX;
 337
 338         //set flags
 339         switch (endian) {
 340                 case 'b': /* b  big-endian (RefIn = false, RefOut = false ) */
 341                         model.flags &= ~P_REFIN;
 342                         rflags |= R_HAVERI;
 343                         /* fall through: */
 344                 case 'B': /* B  big-endian output (RefOut = false) */
 345                         model.flags &= ~P_REFOUT;
 346                         rflags |= R_HAVERO;
 347                         mnovel(&model);
 348                         /* fall through: */
 349                 case 'r': /* r  right-justified */
 350                         model.flags |= P_RTJUST;
 351                         break;
 352                 case 'l': /* l  little-endian input and output */
 353                         model.flags |= P_REFIN;
 354                         rflags |= R_HAVERI;
 355                         /* fall through: */
 356                 case 'L': /* L  little-endian output */
 357                         model.flags |= P_REFOUT;
 358                         rflags |= R_HAVERO;
 359                         mnovel(&model);
 360                         /* fall through: */
 361                 case 't': /* t  left-justified */
 362                         model.flags &= ~P_RTJUST;
 363                         break;
 364         }
 365
 366         mcanon(&model);
 367
 368         if (reverse) {
 369                 // v  calculate reversed CRC
 370                 /* Distinct from the -V switch as this causes
 371                  * the arguments and output to be reversed as well.
 372                  */
 373                 // reciprocate Poly
 374                 prcp(&model.spoly);
 375
 376                 /* mrev() does:
 377                  *   if(refout) prev(init); else prev(xorout);
 378                  * but here the entire argument polynomial is
 379                  * reflected, not just the characters, so RefIn
 380                  * and RefOut are not inverted as with -V.
 381                  * Consequently Init is the mirror image of the
 382                  * one resulting from -V, and so we have:
 383                  */
 384                 if(~model.flags & P_REFOUT) {
 385                         prev(&model.init);
 386                         prev(&model.xorout);
 387                 }
 388
 389                 // swap init and xorout
 390                 apoly = model.init;
 391                 model.init = model.xorout;
 392                 model.xorout = apoly;
 393         }
 394         // c  calculate CRC
 395
 396         // validate inputs
 397         /* if(plen(model.spoly) == 0) {
 398          *      fprintf(stderr,"%s: no polynomial specified for -%c (add -w WIDTH -p POLY)\n", myname, mode);
 399          *      exit(EXIT_FAILURE);
 400          * }
 401          */
 402
 403         /* in the Williams model, xorout is applied after the refout stage.
 404          * as refout is part of ptostr(), we reverse xorout here.
 405          */
 406         if(model.flags & P_REFOUT)
 407                 prev(&model.xorout);
 408
 409         apoly = strtop(inHexStr, model.flags, ibperhx);
 410
 411         if(reverse)
 412                 prev(&apoly);
 413
 414         crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags);
 415
 416         if(reverse)
 417                 prev(&crc);
 418
 419         string = ptostr(crc, model.flags, obperhx);
 420         for (int i = 0; i < 50; i++){
 421                 result[i] = string[i];
 422                 if (result[i]==0) break;
 423         }
 424         free(string);
 425         pfree(&crc);
 426         pfree(&apoly);
 427         return 1;
 428 }
 429
 430 //test call to RunModel
 431 int CmdrevengTestC(const char *Cmd){
 432         int cmdp = 0;
 433         char inModel[30] = {0x00};
 434         char inHexStr[30] = {0x00};
 435         char result[30];
 436         int dataLen;
 437         char endian = 0;
 438         dataLen = param_getstr(Cmd, cmdp++, inModel);
 439         if (dataLen < 4) return 0;
 440         dataLen = param_getstr(Cmd, cmdp++, inHexStr);
 441         if (dataLen < 4) return 0;
 442         bool reverse = (param_get8(Cmd, cmdp++)) ? true : false;
 443         endian = param_getchar(Cmd, cmdp++);
 444
 445         //PrintAndLog("mod: %s, hex: %s, rev %d", inModel, inHexStr, reverse);
 446         int ans = RunModel(inModel, inHexStr, reverse, endian, result);
 447         if (!ans) return 0;
 448
 449         PrintAndLog("Result: %s",result);
 450         return 1;
 451 }
 452
 453 //returns a calloced string (needs to be freed)
 454 char *SwapEndianStr(const char *inStr, const size_t len, const uint8_t blockSize){
 455         char *tmp = calloc(len+1, sizeof(char));
 456         for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
 457                 for (size_t i = 0; i < blockSize; i+=2){
 458                         tmp[i+(blockSize*block)] = inStr[(blockSize-1-i-1)+(blockSize*block)];
 459                         tmp[i+(blockSize*block)+1] = inStr[(blockSize-1-i)+(blockSize*block)];
 460                 }
 461         }
 462         return tmp;
 463 }
 464
 465 // takes hex string in and searches for a matching result (hex string must include checksum)
 466 int CmdrevengSearch(const char *Cmd){
 467         char inHexStr[50] = {0x00};
 468         int dataLen = param_getstr(Cmd, 0, inHexStr);
 469         if (dataLen < 4) return 0;
 470
 471         char *Models[80];
 472         int count = 0;
 473         uint8_t width[80];
 474         width[0] = 0;
 475         uint8_t crcChars = 0;
 476         char result[30];
 477         char revResult[30];
 478         int ans = GetModels(Models, &count, width);
 479         bool found = false;
 480         if (!ans) return 0;
 481
 482         // try each model and get result
 483         for (int i = 0; i < count; i++){
 484                 /*if (found) {
 485                         free(Models[i]);
 486                         continue;
 487                 }*/
 488                 // round up to # of characters in this model's crc
 489                 crcChars = ((width[i]+7)/8)*2;
 490                 // can't test a model that has more crc digits than our data
 491                 if (crcChars >= dataLen)
 492                         continue;
 493                 memset(result, 0, 30);
 494                 char *inCRC = calloc(crcChars+1, sizeof(char));
 495                 memcpy(inCRC, inHexStr+(dataLen-crcChars), crcChars);
 496
 497                 char *outHex = calloc(dataLen-crcChars+1, sizeof(char));
 498                 memcpy(outHex, inHexStr, dataLen-crcChars);
 499
 500                 //PrintAndLog("DEBUG: dataLen: %d, crcChars: %d, Model: %s, CRC: %s, width: %d, outHex: %s",dataLen, crcChars, Models[i], inCRC, width[i], outHex);
 501                 ans = RunModel(Models[i], outHex, false, 0, result);
 502                 if (ans) {
 503                         //test for match
 504                         if (memcmp(result, inCRC, crcChars)==0){
 505                                 PrintAndLog("\nFound a possible match!\nModel: %s\nValue: %s\n",Models[i], result);
 506                                 //optional - stop searching if found...
 507                                 found = true;
 508                         } else {
 509                                 if (crcChars > 2){
 510                                         char *swapEndian = SwapEndianStr(result, crcChars, crcChars);
 511                                         if (memcmp(swapEndian, inCRC, crcChars)==0){
 512                                                 PrintAndLog("\nFound a possible match!\nModel: %s\nValue EndianSwapped: %s\n",Models[i], swapEndian);
 513                                                 //optional - stop searching if found...
 514                                                 found = true;
 515                                         }
 516                                         free(swapEndian);
 517                                 }
 518                         }
 519                 }
 520
 521                 //if (!found){
 522                         ans = RunModel(Models[i], outHex, true, 0, revResult);
 523                         if (ans) {
 524                                 //test for match
 525                                 if (memcmp(revResult, inCRC, crcChars)==0){
 526                                         PrintAndLog("\nFound a possible match!\nModel Reversed: %s\nValue: %s\n",Models[i], revResult);
 527                                         //optional - stop searching if found...
 528                                         found = true;
 529                                 } else {
 530                                         if (crcChars > 2){
 531                                                 char *swapEndian = SwapEndianStr(revResult, crcChars, crcChars);
 532                                                 if (memcmp(swapEndian, inCRC, crcChars)==0){
 533                                                         PrintAndLog("\nFound a possible match!\nModel Reversed: %s\nValue EndianSwapped: %s\n",Models[i], swapEndian);
 534                                                         //optional - stop searching if found...
 535                                                         found = true;
 536                                                 }
 537                                                 free(swapEndian);
 538                                         }
 539                                 }
 540                         }
 541                 //}
 542                 free(inCRC);
 543                 free(outHex);
 544                 free(Models[i]);
 545         }
 546         if (!found) PrintAndLog("\nNo matches found\n");
 547         return 1;
 548 }