cvs.zerfleddert.de Git - proxmark3-svn/blob - client/cmdhflegic.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   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 // High frequency Legic commands
   9 //-----------------------------------------------------------------------------
  10 #include "cmdhflegic.h"
  11
  12 static int CmdHelp(const char *Cmd);
  13
  14 int usage_legic_calccrc8(void){
  15         PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
  16         PrintAndLog("There must be an even number of hexsymbols as input.");
  17         PrintAndLog("Usage:  hf legic crc8 [h] b <hexbytes> u <uidcrc>");
  18         PrintAndLog("Options :");
  19         PrintAndLog("      b <hexbytes>  : hex bytes");
  20         PrintAndLog("      u <uidcrc>    : MCC hexbyte");
  21         PrintAndLog("");
  22         PrintAndLog("Samples :");
  23         PrintAndLog("      hf legic crc8 b deadbeef1122");
  24         PrintAndLog("      hf legic crc8 b deadbeef1122 u 9A");
  25         return 0;
  26 }
  27
  28 int usage_legic_load(void){
  29         PrintAndLog("It loads datasamples from the file `filename` to device memory");
  30         PrintAndLog("Usage:  hf legic load <file name>");
  31         PrintAndLog(" sample: hf legic load filename");
  32         return 0;
  33 }
  34
  35 int usage_legic_read(void){
  36         PrintAndLog("Read data from a legic tag.");
  37         PrintAndLog("Usage:  hf legic read <offset> <num of bytes>");
  38         PrintAndLog("Options :");
  39         PrintAndLog("  <offset>        : offset in data array to start download from");
  40         PrintAndLog("  <num of bytes>  : number of bytes to download");
  41         PrintAndLog("");
  42         PrintAndLog(" sample: hf legic read");
  43         return 0;
  44 }
  45
  46 /*
  47  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  48  *  This is based on information given in the talk held
  49  *  by Henryk Ploetz and Karsten Nohl at 26c3
  50  */
  51 int CmdLegicDecode(const char *Cmd) {
  52         // Index for the bytearray.
  53         int i = 0;
  54         int k = 0, segmentNum;
  55         int segment_len = 0;
  56         int segment_flag = 0;
  57         uint8_t stamp_len = 0;
  58         int crc = 0;
  59         int wrp = 0;
  60         int wrc = 0;
  61         uint8_t data_buf[1052]; // receiver buffer,  should be 1024..
  62         char token_type[5];
  63         int dcf;
  64         int bIsSegmented = 0;
  65
  66         // download EML memory, where the "legic read" command puts the data.
  67         GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
  68         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
  69                 PrintAndLog("Command execute timeout");
  70                 return 1;
  71         }
  72
  73         // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  74         crc = data_buf[4];
  75         uint32_t calc_crc =  CRC8Legic(data_buf, 4);
  76
  77         PrintAndLog("\nCDF: System Area");
  78         PrintAndLog("------------------------------------------------------");
  79         PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
  80                 data_buf[0],
  81                 data_buf[1],
  82                 data_buf[2],
  83                 data_buf[3],
  84                 data_buf[4],
  85                 (calc_crc == crc) ? "OK":"Fail"
  86         );
  87
  88
  89         token_type[0] = 0;
  90         dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];
  91
  92         // New unwritten media?
  93         if(dcf == 0xFFFF) {
  94
  95                 PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
  96                         dcf,
  97                         data_buf[5],
  98                         data_buf[6]
  99                 );
 100
 101         } else if(dcf > 60000) {                // Master token?
 102
 103                 int fl = 0;
 104
 105                 if(data_buf[6] == 0xec) {
 106                         strncpy(token_type, "XAM", sizeof(token_type));
 107                         fl = 1;
 108                         stamp_len = 0x0c - (data_buf[5] >> 4);
 109                 } else {
 110         switch (data_buf[5] & 0x7f) {
 111                 case 0x00 ... 0x2f:
 112                         strncpy(token_type, "IAM",sizeof(token_type));
 113                                         fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
 114                         break;
 115                 case 0x30 ... 0x6f:
 116                         strncpy(token_type, "SAM",sizeof(token_type));
 117                                         fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
 118                         break;
 119                 case 0x70 ... 0x7f:
 120                         strncpy(token_type, "GAM",sizeof(token_type));
 121                                         fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
 122                         break;
 123         }
 124
 125         stamp_len = 0xfc - data_buf[6];
 126                 }
 127
 128                 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
 129                         dcf,
 130                 data_buf[5],
 131                 data_buf[6],
 132                 token_type,
 133                 (data_buf[5]&0x80)>>7,
 134                         stamp_len,
 135                         fl
 136         );
 137
 138         } else {                                                // Is IM(-S) type of card...
 139
 140                 if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
 141                         bIsSegmented = 1;
 142                         strncpy(token_type, "IM-S", sizeof(token_type));
 143                 } else {
 144                         strncpy(token_type, "IM", sizeof(token_type));
 145                 }
 146
 147                 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
 148                         dcf,
 149                         data_buf[5],
 150                         data_buf[6],
 151                         token_type,
 152                         (data_buf[5]&0x80)>>7
 153                 );
 154         }
 155
 156         // Makes no sence to show this on blank media...
 157         if(dcf != 0xFFFF) {
 158
 159                 if(bIsSegmented) {
 160                         PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
 161                 data_buf[7]&0x0f,
 162                 (data_buf[7]&0x70)>>4,
 163                 (data_buf[7]&0x80)>>7,
 164                 data_buf[8]
 165         );
 166                 }
 167
 168                 // Header area is only available on IM-S cards, on master tokens this data is the master token data itself
 169                 if(bIsSegmented || dcf > 60000) {
 170                         if(dcf > 60000) {
 171                                 PrintAndLog("Master token data");
 172                                 PrintAndLog("%s", sprint_hex(data_buf+8, 14));
 173                         } else {
 174         PrintAndLog("Remaining Header Area");
 175         PrintAndLog("%s", sprint_hex(data_buf+9, 13));
 176                         }
 177                 }
 178         }
 179
 180
 181         uint8_t segCrcBytes[8] = {0x00};
 182         uint32_t segCalcCRC = 0;
 183         uint32_t segCRC = 0;
 184
 185
 186         // Data card?
 187         if(dcf <= 60000) {
 188
 189         PrintAndLog("\nADF: User Area");
 190         PrintAndLog("------------------------------------------------------");
 191
 192                 if(bIsSegmented) {
 193
 194                         // Data start point on segmented cards
 195         i = 22;
 196
 197                         // decode segments
 198                         for (segmentNum=1; segmentNum < 128; segmentNum++ )
 199                         {
 200                 segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 201                 segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 202                 wrp = (data_buf[i+2]^crc);
 203                 wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 204
 205                 bool hasWRC = (wrc > 0);
 206                 bool hasWRP = (wrp > wrc);
 207                 int wrp_len = (wrp - wrc);
 208                 int remain_seg_payload_len = (segment_len - wrp - 5);
 209
 210                 // validate segment-crc
 211                 segCrcBytes[0]=data_buf[0];                     //uid0
 212                 segCrcBytes[1]=data_buf[1];                     //uid1
 213                 segCrcBytes[2]=data_buf[2];                     //uid2
 214                 segCrcBytes[3]=data_buf[3];                     //uid3
 215                 segCrcBytes[4]=(data_buf[i]^crc);       //hdr0
 216                 segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
 217                 segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
 218                 segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
 219
 220                 segCalcCRC = CRC8Legic(segCrcBytes, 8);
 221                 segCRC = data_buf[i+4]^crc;
 222
 223                 PrintAndLog("Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u,  Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
 224                         segmentNum,
 225                         data_buf[i]^crc,
 226                         data_buf[i+1]^crc,
 227                         data_buf[i+2]^crc,
 228                         data_buf[i+3]^crc,
 229                         segment_len,
 230                         segment_flag,
 231                         (segment_flag & 0x4) >> 2,
 232                         (segment_flag & 0x8) >> 3,
 233                         wrp,
 234                         wrc,
 235                         ((data_buf[i+3]^crc) & 0x80) >> 7,
 236                         segCRC,
 237                         ( segCRC == segCalcCRC ) ? "OK" : "fail"
 238                 );
 239
 240                 i += 5;
 241
 242                 if ( hasWRC ) {
 243                         PrintAndLog("WRC protected area:   (I %d | K %d| WRC %d)", i, k, wrc);
 244                         PrintAndLog("\nrow  | data");
 245                         PrintAndLog("-----+------------------------------------------------");
 246
 247                                         for ( k=i; k < (i+wrc); ++k)
 248                                         data_buf[k] ^= crc;
 249
 250                         print_hex_break( data_buf+i, wrc, 16);
 251
 252                         i += wrc;
 253                 }
 254
 255                 if ( hasWRP ) {
 256                         PrintAndLog("Remaining write protected area:  (I %d | K %d | WRC %d | WRP %d  WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
 257                         PrintAndLog("\nrow  | data");
 258                         PrintAndLog("-----+------------------------------------------------");
 259
 260                                         for (k=i; k < (i+wrp_len); ++k)
 261                                         data_buf[k] ^= crc;
 262
 263                         print_hex_break( data_buf+i, wrp_len, 16);
 264
 265                         i += wrp_len;
 266
 267                                         // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
 268                         if( wrp_len == 8 )
 269                                 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
 270                 }
 271
 272                 PrintAndLog("Remaining segment payload:  (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
 273                 PrintAndLog("\nrow  | data");
 274                 PrintAndLog("-----+------------------------------------------------");
 275
 276                                 for ( k=i; k < (i+remain_seg_payload_len); ++k)
 277                                 data_buf[k] ^= crc;
 278
 279                 print_hex_break( data_buf+i, remain_seg_payload_len, 16);
 280
 281                 i += remain_seg_payload_len;
 282
 283                 PrintAndLog("-----+------------------------------------------------\n");
 284
 285                 // end with last segment
 286                 if (segment_flag & 0x8) return 0;
 287
 288         } // end for loop
 289
 290                 } else {
 291
 292                         // Data start point on unsegmented cards
 293                         i = 8;
 294
 295                         wrp          = data_buf[7] & 0x0F;
 296                         wrc          = (data_buf[7] & 0x07) >> 4;
 297
 298                         bool hasWRC = (wrc > 0);
 299                         bool hasWRP = (wrp > wrc);
 300                         int wrp_len = (wrp - wrc);
 301                         int remain_seg_payload_len = (1024 - 22 - wrp); // Any chance to get physical card size here!?
 302
 303                         PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
 304                                 wrp,
 305                                 wrc,
 306                                 (data_buf[7] & 0x80) >> 7
 307                         );
 308
 309                         if ( hasWRC ) {
 310                                 PrintAndLog("WRC protected area:   (I %d | WRC %d)", i, wrc);
 311                                 PrintAndLog("\nrow  | data");
 312                                 PrintAndLog("-----+------------------------------------------------");
 313                                 print_hex_break( data_buf+i, wrc, 16);
 314                                 i += wrc;
 315                         }
 316
 317                         if ( hasWRP ) {
 318                                 PrintAndLog("Remaining write protected area:  (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
 319                                 PrintAndLog("\nrow  | data");
 320                                 PrintAndLog("-----+------------------------------------------------");
 321                                 print_hex_break( data_buf+i, wrp_len, 16);
 322                                 i += wrp_len;
 323
 324                                 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
 325                                 if( wrp_len == 8 )
 326                                         PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4], data_buf[i-3], data_buf[i-2]);
 327                         }
 328
 329                         PrintAndLog("Remaining segment payload:  (I %d | Remain LEN %d)", i, remain_seg_payload_len);
 330                         PrintAndLog("\nrow  | data");
 331                         PrintAndLog("-----+------------------------------------------------");
 332                         print_hex_break( data_buf+i, remain_seg_payload_len, 16);
 333                         i += remain_seg_payload_len;
 334
 335                         PrintAndLog("-----+------------------------------------------------\n");
 336                 }
 337         }
 338
 339         return 0;
 340 }
 341
 342 int CmdLegicRFRead(const char *Cmd) {
 343
 344         // params:
 345         // offset in data
 346         // number of bytes.
 347         char cmdp = param_getchar(Cmd, 0);
 348         if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
 349
 350         int byte_count=0, offset=0;
 351         sscanf(Cmd, "%i %i", &offset, &byte_count);
 352         if(byte_count == 0) byte_count = -1;
 353         if(byte_count + offset > 1024) byte_count = 1024 - offset;
 354
 355         UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 356         clearCommandBuffer();
 357         SendCommand(&c);
 358         return 0;
 359 }
 360
 361 int CmdLegicLoad(const char *Cmd) {
 362
 363         char cmdp = param_getchar(Cmd, 0);
 364         if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
 365
 366         char filename[FILE_PATH_SIZE] = {0x00};
 367         int len = strlen(Cmd);
 368
 369         if (len > FILE_PATH_SIZE) {
 370                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 371                 return 0;
 372         }
 373         memcpy(filename, Cmd, len);
 374
 375     FILE *f = fopen(filename, "r");
 376     if(!f) {
 377         PrintAndLog("couldn't open '%s'", Cmd);
 378         return -1;
 379     }
 380
 381     char line[80];
 382         int offset = 0;
 383         uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
 384         int index = 0;
 385         int totalbytes = 0;
 386     while ( fgets(line, sizeof(line), f) ) {
 387         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 388             (unsigned int *)&data[index],
 389                         (unsigned int *)&data[index + 1],
 390                         (unsigned int *)&data[index + 2],
 391                         (unsigned int *)&data[index + 3],
 392             (unsigned int *)&data[index + 4],
 393                         (unsigned int *)&data[index + 5],
 394                         (unsigned int *)&data[index + 6],
 395                         (unsigned int *)&data[index + 7]);
 396
 397         if(res != 8) {
 398           PrintAndLog("Error: could not read samples");
 399           fclose(f);
 400           return -1;
 401         }
 402                 index += res;
 403
 404                 if ( index == USB_CMD_DATA_SIZE ){
 405 //                      PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
 406                         UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 407                         memcpy(c.d.asBytes, data, sizeof(data));
 408                         clearCommandBuffer();
 409                         SendCommand(&c);
 410                         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
 411                                 PrintAndLog("Command execute timeout");
 412                                 fclose(f);
 413                                 return 1;
 414                         }
 415                         offset += index;
 416                         totalbytes += index;
 417                         index = 0;
 418                 }
 419     }
 420     fclose(f);
 421
 422         // left over bytes?
 423         if ( index != 0 ) {
 424                 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 425                 memcpy(c.d.asBytes, data, 8);
 426                 clearCommandBuffer();
 427                 SendCommand(&c);
 428                 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
 429                                 PrintAndLog("Command execute timeout");
 430                                 return 1;
 431                 }
 432                 totalbytes += index;
 433         }
 434
 435     PrintAndLog("loaded %u samples", totalbytes);
 436     return 0;
 437 }
 438
 439 int CmdLegicSave(const char *Cmd) {
 440         int requested = 1024;
 441         int offset = 0;
 442         int delivered = 0;
 443         char filename[FILE_PATH_SIZE];
 444         uint8_t got[1024] = {0x00};
 445
 446         sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 447
 448         /* If no length given save entire legic read buffer */
 449         /* round up to nearest 8 bytes so the saved data can be used with legicload */
 450         if (requested == 0)
 451                 requested = 1024;
 452
 453         if (requested % 8 != 0) {
 454                 int remainder = requested % 8;
 455                 requested = requested + 8 - remainder;
 456         }
 457
 458         if (offset + requested > sizeof(got)) {
 459                 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 460                 return 0;
 461         }
 462
 463         GetFromBigBuf(got, requested, offset);
 464         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
 465                 PrintAndLog("Command execute timeout");
 466                 return 1;
 467         }
 468
 469         FILE *f = fopen(filename, "w");
 470         if(!f) {
 471                 PrintAndLog("couldn't open '%s'", Cmd+1);
 472                 return -1;
 473         }
 474
 475         for (int j = 0; j < requested; j += 8) {
 476                 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 477                         got[j+0], got[j+1], got[j+2], got[j+3],
 478                         got[j+4], got[j+5],     got[j+6], got[j+7]
 479                 );
 480                 delivered += 8;
 481                 if (delivered >= requested) break;
 482         }
 483
 484         fclose(f);
 485         PrintAndLog("saved %u samples", delivered);
 486         return 0;
 487 }
 488
 489 //TODO: write a help text (iceman)
 490 int CmdLegicRfSim(const char *Cmd) {
 491         UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
 492         sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 493         clearCommandBuffer();
 494         SendCommand(&c);
 495         return 0;
 496 }
 497
 498 //TODO: write a help text (iceman)
 499 int CmdLegicRfWrite(const char *Cmd) {
 500     UsbCommand c = {CMD_WRITER_LEGIC_RF};
 501     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 502         if(res != 2) {
 503                 PrintAndLog("Please specify the offset and length as two hex strings");
 504         return -1;
 505     }
 506         clearCommandBuffer();
 507     SendCommand(&c);
 508     return 0;
 509 }
 510
 511 //TODO: write a help text (iceman)
 512 int CmdLegicRfRawWrite(const char *Cmd) {
 513         char answer;
 514     UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
 515     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 516         if(res != 2) {
 517                 PrintAndLog("Please specify the offset and value as two hex strings");
 518         return -1;
 519     }
 520
 521         if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
 522                 PrintAndLog("############# DANGER !! #############");
 523                 PrintAndLog("# changing the DCF is irreversible  #");
 524                 PrintAndLog("#####################################");
 525                 PrintAndLog("do youe really want to continue? y(es) n(o)");
 526                 scanf(" %c", &answer);
 527                 if (answer == 'y' || answer == 'Y') {
 528                         SendCommand(&c);
 529                         return 0;
 530                 }
 531                 return -1;
 532         }
 533
 534         clearCommandBuffer();
 535     SendCommand(&c);
 536         return 0;
 537 }
 538
 539 //TODO: write a help text (iceman)
 540 int CmdLegicRfFill(const char *Cmd) {
 541     UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
 542     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 543     if(res != 3) {
 544         PrintAndLog("Please specify the offset, length and value as two hex strings");
 545         return -1;
 546     }
 547
 548     int i;
 549     UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 550         memcpy(c.d.asBytes, cmd.arg[2], 48);
 551
 552         for(i = 0; i < 22; i++) {
 553                 c.arg[0] = i*48;
 554
 555                 clearCommandBuffer();
 556                 SendCommand(&c);
 557                 WaitForResponse(CMD_ACK, NULL);
 558         }
 559         clearCommandBuffer();
 560     SendCommand(&cmd);
 561     return 0;
 562  }
 563
 564 int CmdLegicCalcCrc8(const char *Cmd){
 565
 566         uint8_t *data;
 567         uint8_t cmdp = 0, uidcrc = 0, type=0;
 568         bool errors = false;
 569         int len = 0;
 570
 571         while(param_getchar(Cmd, cmdp) != 0x00) {
 572                 switch(param_getchar(Cmd, cmdp)) {
 573                 case 'b':
 574                 case 'B':
 575                         data = malloc(len);
 576                         if ( data == NULL ) {
 577                                 PrintAndLog("Can't allocate memory. exiting");
 578                                 errors = true;
 579                                 break;
 580                         }
 581                         param_gethex_ex(Cmd, cmdp+1, data, &len);
 582                         // if odd symbols, (hexbyte must be two symbols)
 583                         if ( len & 1 ) errors = true;
 584
 585                         len >>= 1;
 586                         cmdp += 2;
 587                         break;
 588                 case 'u':
 589                 case 'U':
 590                         uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
 591                         cmdp += 2;
 592                         break;
 593                 case 'c':
 594                 case 'C':
 595                         type = param_get8ex(Cmd, cmdp+1, 0, 10);
 596                         cmdp += 2;
 597                         break;
 598                 case 'h':
 599                 case 'H':
 600                         errors = true;
 601                         break;
 602                 default:
 603                         PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
 604                         errors = true;
 605                         break;
 606                 }
 607                 if (errors) break;
 608         }
 609         //Validations
 610         if (errors){
 611                 if (data != NULL) free(data);
 612                 return usage_legic_calccrc8();
 613         }
 614
 615         switch (type){
 616                 case 16:
 617                         PrintAndLog("LEGIC CRC16: %X", CRC16Legic(data, len, uidcrc));
 618                         break;
 619                 default:
 620                         PrintAndLog("LEGIC CRC8: %X",  CRC8Legic(data, len) );
 621                         break;
 622         }
 623
 624         free(data);
 625         return 0;
 626 }
 627
 628 static command_t CommandTable[] =  {
 629         {"help",        CmdHelp,        1, "This help"},
 630         {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
 631         {"read",        CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
 632         {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
 633         {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
 634         {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
 635         {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
 636         {"writeRaw",CmdLegicRfRawWrite, 0, "<address> <value> -- Write direct to address"},
 637         {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
 638         {"crc8",        CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
 639         {NULL, NULL, 0, NULL}
 640 };
 641
 642 int CmdHFLegic(const char *Cmd) {
 643         clearCommandBuffer();
 644         CmdsParse(CommandTable, Cmd);
 645         return 0;
 646 }
 647
 648 int CmdHelp(const char *Cmd) {
 649         CmdsHelp(CommandTable);
 650         return 0;
 651 }