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

   1 // Merlok, 2011, 2012
   2 // people from mifare@nethemba.com, 2010
   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 // mifare commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <pthread.h>
  15 #include "mifarehost.h"
  16 #include "proxmark3.h"
  17
  18 // MIFARE
  19 int compar_int(const void * a, const void * b) {
  20         // didn't work: (the result is truncated to 32 bits)
  21         //return (*(uint64_t*)b - *(uint64_t*)a);
  22
  23         // better:
  24         if (*(uint64_t*)b == *(uint64_t*)a) return 0;
  25         else if (*(uint64_t*)b > *(uint64_t*)a) return 1;
  26         else return -1;
  27 }
  28
  29 // Compare 16 Bits out of cryptostate
  30 int Compare16Bits(const void * a, const void * b) {
  31         if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;
  32         else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;
  33         else return -1;
  34 }
  35
  36 typedef
  37         struct {
  38                 union {
  39                         struct Crypto1State *slhead;
  40                         uint64_t *keyhead;
  41                 } head;
  42                 union {
  43                         struct Crypto1State *sltail;
  44                         uint64_t *keytail;
  45                 } tail;
  46                 uint32_t len;
  47                 uint32_t uid;
  48                 uint32_t blockNo;
  49                 uint32_t keyType;
  50                 uint32_t nt;
  51                 uint32_t ks1;
  52         } StateList_t;
  53
  54
  55 // wrapper function for multi-threaded lfsr_recovery32
  56 void* nested_worker_thread(void *arg)
  57 {
  58         struct Crypto1State *p1;
  59         StateList_t *statelist = arg;
  60
  61         statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);
  62         for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);
  63         statelist->len = p1 - statelist->head.slhead;
  64         statelist->tail.sltail = --p1;
  65         qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);
  66
  67         return statelist->head.slhead;
  68 }
  69
  70 int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate)
  71 {
  72         uint16_t i, len;
  73         uint32_t uid;
  74         UsbCommand resp;
  75         StateList_t statelists[2];
  76         struct Crypto1State *p1, *p2, *p3, *p4;
  77
  78         // flush queue
  79         WaitForResponseTimeout(CMD_ACK,NULL,100);
  80
  81         UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};
  82         memcpy(c.d.asBytes, key, 6);
  83         SendCommand(&c);
  84
  85         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
  86                 len = resp.arg[1];
  87                 if (len == 2) {
  88                         memcpy(&uid, resp.d.asBytes, 4);
  89                         PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);
  90
  91                         for (i = 0; i < 2; i++) {
  92                                 statelists[i].blockNo = resp.arg[2] & 0xff;
  93                                 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;
  94                                 statelists[i].uid = uid;
  95
  96                                 memcpy(&statelists[i].nt,  (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);
  97                                 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);
  98                         }
  99                 }
 100                 else {
 101                         PrintAndLog("Got 0 keys from proxmark.");
 102                         return 1;
 103                 }
 104         }
 105
 106         // calc keys
 107
 108         pthread_t thread_id[2];
 109
 110         // create and run worker threads
 111         for (i = 0; i < 2; i++) {
 112                 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);
 113         }
 114
 115         // wait for threads to terminate:
 116         for (i = 0; i < 2; i++) {
 117                 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);
 118         }
 119
 120
 121         // the first 16 Bits of the cryptostate already contain part of our key.
 122         // Create the intersection of the two lists based on these 16 Bits and
 123         // roll back the cryptostate
 124         p1 = p3 = statelists[0].head.slhead;
 125         p2 = p4 = statelists[1].head.slhead;
 126         while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {
 127                 if (Compare16Bits(p1, p2) == 0) {
 128                         struct Crypto1State savestate, *savep = &savestate;
 129                         savestate = *p1;
 130                         while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {
 131                                 *p3 = *p1;
 132                                 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);
 133                                 p3++;
 134                                 p1++;
 135                         }
 136                         savestate = *p2;
 137                         while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {
 138                                 *p4 = *p2;
 139                                 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);
 140                                 p4++;
 141                                 p2++;
 142                         }
 143                 }
 144                 else {
 145                         while (Compare16Bits(p1, p2) == -1) p1++;
 146                         while (Compare16Bits(p1, p2) == 1) p2++;
 147                 }
 148         }
 149         p3->even = 0; p3->odd = 0;
 150         p4->even = 0; p4->odd = 0;
 151         statelists[0].len = p3 - statelists[0].head.slhead;
 152         statelists[1].len = p4 - statelists[1].head.slhead;
 153         statelists[0].tail.sltail=--p3;
 154         statelists[1].tail.sltail=--p4;
 155
 156         // the statelists now contain possible keys. The key we are searching for must be in the
 157         // intersection of both lists. Create the intersection:
 158         qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);
 159         qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);
 160
 161         uint64_t *p5, *p6, *p7;
 162         p5 = p7 = statelists[0].head.keyhead;
 163         p6 = statelists[1].head.keyhead;
 164         while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {
 165                 if (compar_int(p5, p6) == 0) {
 166                         *p7++ = *p5++;
 167                         p6++;
 168                 }
 169                 else {
 170                         while (compar_int(p5, p6) == -1) p5++;
 171                         while (compar_int(p5, p6) == 1) p6++;
 172                 }
 173         }
 174         statelists[0].len = p7 - statelists[0].head.keyhead;
 175         statelists[0].tail.keytail=--p7;
 176
 177         memset(resultKey, 0, 6);
 178         // The list may still contain several key candidates. Test each of them with mfCheckKeys
 179         for (i = 0; i < statelists[0].len; i++) {
 180                 uint8_t keyBlock[6];
 181                 uint64_t key64;
 182                 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);
 183                 num_to_bytes(key64, 6, keyBlock);
 184                 key64 = 0;
 185                 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, 1, keyBlock, &key64)) {
 186                         num_to_bytes(key64, 6, resultKey);
 187                         break;
 188                 }
 189         }
 190
 191         free(statelists[0].head.slhead);
 192         free(statelists[1].head.slhead);
 193
 194         return 0;
 195 }
 196
 197 int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){
 198
 199         *key = 0;
 200
 201         UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};
 202         memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
 203         SendCommand(&c);
 204
 205         UsbCommand resp;
 206         if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;
 207         if ((resp.arg[0] & 0xff) != 0x01) return 2;
 208         *key = bytes_to_num(resp.d.asBytes, 6);
 209         return 0;
 210 }
 211
 212 // EMULATOR
 213
 214 int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {
 215         UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};
 216         SendCommand(&c);
 217
 218         UsbCommand resp;
 219         if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;
 220         memcpy(data, resp.d.asBytes, blocksCount * 16);
 221         return 0;
 222 }
 223
 224 int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {
 225         UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};
 226         memcpy(c.d.asBytes, data, blocksCount * 16);
 227         SendCommand(&c);
 228         return 0;
 229 }
 230
 231 // "MAGIC" CARD
 232
 233 int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool wantWipe) {
 234         uint8_t oldblock0[16] = {0x00};
 235         uint8_t block0[16] = {0x00};
 236
 237         int old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);
 238         if (old == 0) {
 239                 memcpy(block0, oldblock0, 16);
 240                 PrintAndLog("old block 0:  %s", sprint_hex(block0,16));
 241         } else {
 242                 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");
 243         }
 244
 245         // fill in the new values
 246         // UID
 247         memcpy(block0, uid, 4);
 248         // Mifare UID BCC
 249         block0[4] = block0[0]^block0[1]^block0[2]^block0[3];
 250         // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)
 251         if (sak!=NULL)
 252                 block0[5]=sak[0];
 253         if (atqa!=NULL) {
 254                 block0[6]=atqa[1];
 255                 block0[7]=atqa[0];
 256         }
 257         PrintAndLog("new block 0:  %s", sprint_hex(block0,16));
 258         return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);
 259 }
 260
 261 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {
 262
 263         uint8_t isOK = 0;
 264         UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};
 265         memcpy(c.d.asBytes, data, 16);
 266         SendCommand(&c);
 267
 268         UsbCommand resp;
 269         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 270                 isOK  = resp.arg[0] & 0xff;
 271                 if (uid != NULL)
 272                         memcpy(uid, resp.d.asBytes, 4);
 273                 if (!isOK)
 274                         return 2;
 275         } else {
 276                 PrintAndLog("Command execute timeout");
 277                 return 1;
 278         }
 279         return 0;
 280 }
 281
 282 int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
 283         uint8_t isOK = 0;
 284
 285         UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};
 286         SendCommand(&c);
 287
 288   UsbCommand resp;
 289         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 290                 isOK  = resp.arg[0] & 0xff;
 291                 memcpy(data, resp.d.asBytes, 16);
 292                 if (!isOK) return 2;
 293         } else {
 294                 PrintAndLog("Command execute timeout");
 295                 return 1;
 296         }
 297         return 0;
 298 }
 299
 300 // SNIFFER
 301
 302 // constants
 303 static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};
 304
 305 // variables
 306 char logHexFileName[FILE_PATH_SIZE] = {0x00};
 307 static uint8_t traceCard[4096] = {0x00};
 308 static char traceFileName[FILE_PATH_SIZE] = {0x00};
 309 static int traceState = TRACE_IDLE;
 310 static uint8_t traceCurBlock = 0;
 311 static uint8_t traceCurKey = 0;
 312
 313 struct Crypto1State *traceCrypto1 = NULL;
 314
 315 struct Crypto1State *revstate;
 316 uint64_t lfsr;
 317 uint32_t ks2;
 318 uint32_t ks3;
 319
 320 uint32_t uid;     // serial number
 321 uint32_t nt;      // tag challenge
 322 uint32_t nr_enc;  // encrypted reader challenge
 323 uint32_t ar_enc;  // encrypted reader response
 324 uint32_t at_enc;  // encrypted tag response
 325
 326 int isTraceCardEmpty(void) {
 327         return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));
 328 }
 329
 330 int isBlockEmpty(int blockN) {
 331         for (int i = 0; i < 16; i++)
 332                 if (traceCard[blockN * 16 + i] != 0) return 0;
 333
 334         return 1;
 335 }
 336
 337 int isBlockTrailer(int blockN) {
 338  return ((blockN & 0x03) == 0x03);
 339 }
 340
 341 int loadTraceCard(uint8_t *tuid) {
 342         FILE * f;
 343         char buf[64] = {0x00};
 344         uint8_t buf8[64] = {0x00};
 345         int i, blockNum;
 346
 347         if (!isTraceCardEmpty())
 348                 saveTraceCard();
 349
 350         memset(traceCard, 0x00, 4096);
 351         memcpy(traceCard, tuid + 3, 4);
 352
 353         FillFileNameByUID(traceFileName, tuid, ".eml", 7);
 354
 355         f = fopen(traceFileName, "r");
 356         if (!f) {
 357                 fclose(f);
 358                 return 1;
 359         }
 360
 361         blockNum = 0;
 362
 363         while(!feof(f)){
 364
 365                 memset(buf, 0, sizeof(buf));
 366                 if (fgets(buf, sizeof(buf), f) == NULL) {
 367       PrintAndLog("File reading error.");
 368                         fclose(f);
 369                         return 2;
 370     }
 371
 372                 if (strlen(buf) < 32){
 373                         if (feof(f)) break;
 374                         PrintAndLog("File content error. Block data must include 32 HEX symbols");
 375                         fclose(f);
 376                         return 2;
 377                 }
 378                 for (i = 0; i < 32; i += 2)
 379                         sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);
 380
 381                 memcpy(traceCard + blockNum * 16, buf8, 16);
 382
 383                 blockNum++;
 384         }
 385         fclose(f);
 386
 387         return 0;
 388 }
 389
 390 int saveTraceCard(void) {
 391         FILE * f;
 392
 393         if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;
 394
 395         f = fopen(traceFileName, "w+");
 396         if ( !f ) {
 397                 fclose(f);
 398                 return 1;
 399         }
 400
 401         for (int i = 0; i < 64; i++) {  // blocks
 402                 for (int j = 0; j < 16; j++)  // bytes
 403                         fprintf(f, "%02x", *(traceCard + i * 16 + j));
 404                 fprintf(f,"\n");
 405         }
 406         fclose(f);
 407         return 0;
 408 }
 409
 410 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {
 411
 412         if (traceCrypto1)
 413                 crypto1_destroy(traceCrypto1);
 414
 415         traceCrypto1 = NULL;
 416
 417         if (wantSaveToEmlFile)
 418                 loadTraceCard(tuid);
 419
 420         traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];
 421         traceCard[5] = sak;
 422         memcpy(&traceCard[6], atqa, 2);
 423         traceCurBlock = 0;
 424         uid = bytes_to_num(tuid + 3, 4);
 425
 426         traceState = TRACE_IDLE;
 427
 428         return 0;
 429 }
 430
 431 void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){
 432         uint8_t bt = 0;
 433         int i;
 434
 435         if (len != 1) {
 436                 for (i = 0; i < len; i++)
 437                         data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];
 438         } else {
 439                 bt = 0;
 440                 for (i = 0; i < 4; i++)
 441                         bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;
 442
 443                 data[0] = bt;
 444         }
 445         return;
 446 }
 447
 448
 449 int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
 450         uint8_t data[64];
 451
 452         if (traceState == TRACE_ERROR) return 1;
 453         if (len > 64) {
 454                 traceState = TRACE_ERROR;
 455                 return 1;
 456         }
 457
 458         memcpy(data, data_src, len);
 459         if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {
 460                 mf_crypto1_decrypt(traceCrypto1, data, len, 0);
 461                 PrintAndLog("dec> %s", sprint_hex(data, len));
 462                 AddLogHex(logHexFileName, "dec> ", data, len);
 463         }
 464
 465         switch (traceState) {
 466         case TRACE_IDLE:
 467                 // check packet crc16!
 468                 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {
 469                         PrintAndLog("dec> CRC ERROR!!!");
 470                         AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");
 471                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 472                         return 1;
 473                 }
 474
 475                 // AUTHENTICATION
 476                 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {
 477                         traceState = TRACE_AUTH1;
 478                         traceCurBlock = data[1];
 479                         traceCurKey = data[0] == 60 ? 1:0;
 480                         return 0;
 481                 }
 482
 483                 // READ
 484                 if ((len ==4) && ((data[0] == 0x30))) {
 485                         traceState = TRACE_READ_DATA;
 486                         traceCurBlock = data[1];
 487                         return 0;
 488                 }
 489
 490                 // WRITE
 491                 if ((len ==4) && ((data[0] == 0xA0))) {
 492                         traceState = TRACE_WRITE_OK;
 493                         traceCurBlock = data[1];
 494                         return 0;
 495                 }
 496
 497                 // HALT
 498                 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {
 499                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 500                         return 0;
 501                 }
 502
 503                 return 0;
 504         break;
 505
 506         case TRACE_READ_DATA:
 507                 if (len == 18) {
 508                         traceState = TRACE_IDLE;
 509
 510                         if (isBlockTrailer(traceCurBlock)) {
 511                                 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);
 512                         } else {
 513                                 memcpy(traceCard + traceCurBlock * 16, data, 16);
 514                         }
 515                         if (wantSaveToEmlFile) saveTraceCard();
 516                         return 0;
 517                 } else {
 518                         traceState = TRACE_ERROR;
 519                         return 1;
 520                 }
 521         break;
 522
 523         case TRACE_WRITE_OK:
 524                 if ((len == 1) && (data[0] == 0x0a)) {
 525                         traceState = TRACE_WRITE_DATA;
 526
 527                         return 0;
 528                 } else {
 529                         traceState = TRACE_ERROR;
 530                         return 1;
 531                 }
 532         break;
 533
 534         case TRACE_WRITE_DATA:
 535                 if (len == 18) {
 536                         traceState = TRACE_IDLE;
 537
 538                         memcpy(traceCard + traceCurBlock * 16, data, 16);
 539                         if (wantSaveToEmlFile) saveTraceCard();
 540                         return 0;
 541                 } else {
 542                         traceState = TRACE_ERROR;
 543                         return 1;
 544                 }
 545         break;
 546
 547         case TRACE_AUTH1:
 548                 if (len == 4) {
 549                         traceState = TRACE_AUTH2;
 550                         nt = bytes_to_num(data, 4);
 551                         return 0;
 552                 } else {
 553                         traceState = TRACE_ERROR;
 554                         return 1;
 555                 }
 556         break;
 557
 558         case TRACE_AUTH2:
 559                 if (len == 8) {
 560                         traceState = TRACE_AUTH_OK;
 561
 562                         nr_enc = bytes_to_num(data, 4);
 563                         ar_enc = bytes_to_num(data + 4, 4);
 564                         return 0;
 565                 } else {
 566                         traceState = TRACE_ERROR;
 567                         return 1;
 568                 }
 569         break;
 570
 571         case TRACE_AUTH_OK:
 572                 if (len ==4) {
 573                         traceState = TRACE_IDLE;
 574
 575                         at_enc = bytes_to_num(data, 4);
 576
 577                         //  decode key here)
 578                         ks2 = ar_enc ^ prng_successor(nt, 64);
 579                         ks3 = at_enc ^ prng_successor(nt, 96);
 580                         revstate = lfsr_recovery64(ks2, ks3);
 581                         lfsr_rollback_word(revstate, 0, 0);
 582                         lfsr_rollback_word(revstate, 0, 0);
 583                         lfsr_rollback_word(revstate, nr_enc, 1);
 584                         lfsr_rollback_word(revstate, uid ^ nt, 0);
 585
 586                         crypto1_get_lfsr(revstate, &lfsr);
 587                         printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));
 588                         AddLogUint64(logHexFileName, "key> ", lfsr);
 589
 590                         int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
 591                         if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
 592
 593                         if (traceCurKey) {
 594                                 num_to_bytes(lfsr, 6, traceCard + blockShift + 10);
 595                         } else {
 596                                 num_to_bytes(lfsr, 6, traceCard + blockShift);
 597                         }
 598                         if (wantSaveToEmlFile) saveTraceCard();
 599
 600                         if (traceCrypto1) {
 601                                 crypto1_destroy(traceCrypto1);
 602                         }
 603
 604                         // set cryptosystem state
 605                         traceCrypto1 = lfsr_recovery64(ks2, ks3);
 606
 607 //      nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;
 608
 609         /*      traceCrypto1 = crypto1_create(lfsr); // key in lfsr
 610                 crypto1_word(traceCrypto1, nt ^ uid, 0);
 611                 crypto1_word(traceCrypto1, ar, 1);
 612                 crypto1_word(traceCrypto1, 0, 0);
 613                 crypto1_word(traceCrypto1, 0, 0);*/
 614
 615                         return 0;
 616                 } else {
 617                         traceState = TRACE_ERROR;
 618                         return 1;
 619                 }
 620         break;
 621
 622         default:
 623                 traceState = TRACE_ERROR;
 624                 return 1;
 625         }
 626
 627         return 0;
 628 }