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                         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         //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         }
  79
  80         return 0;
  81 }
  82
  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         };
  93
  94         int ibperhx = 8;//, obperhx = 8;
  95         int rflags = 0, uflags = 0; /* search and UI flags */
  96         poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL;
  97         model_t pset = model, *candmods, *mptr;
  98
  99         /* stdin must be binary */
 100         #ifdef _WIN32
 101                 _setmode(STDIN_FILENO, _O_BINARY);
 102         #endif /* _WIN32 */
 103
 104         SETBMP();
 105
 106         int args = 0, psets, pass;
 107         int Cnt = 0;
 108         if (*width == 0) { //reveng -D
 109                 *count = mcount();
 110                 if(!*count)
 111                         return uerr("no preset models available");
 112
 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;
 117                         char *tmp = calloc(size+1, sizeof(char));
 118                         if (tmp==NULL)
 119                                 return uerr("out of memory?");
 120
 121                         memcpy(tmp, model.name, size);
 122                         Models[mode] = tmp;
 123                 }
 124                 mfree(&model);
 125         } else { //reveng -s
 126
 127                 if(~model.flags & P_MULXN)
 128                         return uerr("cannot search for non-Williams compliant models");
 129
 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);
 137
 138                 /* special case if qpoly is zero, search to end of range */
 139                 if(!ptst(qpoly))
 140                         rflags &= ~R_HAVEQ;
 141
 142
 143                 /* not going to be sending additional args at this time (maybe future?)
 144
 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");
 149
 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                 */
 159
 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);
 198                                         }
 199                                         pfree(&apoly);
 200                                         if(qptr == pptr) {
 201
 202                                                 /* the selected model solved all arguments */
 203
 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;
 217                                         }
 218                                 }
 219                                 mfree(&pset);
 220
 221                                 /* toggle refIn/refOut and reflect arguments */
 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);
 228                 }
 229                 //got everything now free the memory...
 230
 231                 if(uflags & C_RESULT) {
 232                         for(qptr = apolys; qptr < pptr; ++qptr)
 233                                 pfree(qptr);
 234                 }
 235                 if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT))
 236                         return uerr("cannot search for crossed-endian models");
 237
 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);
 259         }
 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;
 268         width = param_get8(Cmd, 0);
 269         //PrintAndLog("width: %d",width);
 270         if (width > 89)
 271                 return uerr("Width cannot exceed 89");
 272
 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 }
 283
 284 //-c || -v
 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){
 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
 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
 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;
 426         char endian = 0;
 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;
 431         bool reverse = (param_get8(Cmd, cmdp++)) ? true : false;
 432         endian = param_getchar(Cmd, cmdp++);
 433
 434         //PrintAndLog("mod: %s, hex: %s, rev %d", inModel, inHexStr, reverse);
 435         int ans = RunModel(inModel, inHexStr, reverse, endian, result);
 436         if (!ans) return 0;
 437
 438         PrintAndLog("Result: %s",result);
 439         return 1;
 440 }