cvs.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlf.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 // Low frequency commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <limits.h>
  15 //#include "proxusb.h"
  16 #include "proxmark3.h"
  17 #include "data.h"
  18 #include "graph.h"
  19 #include "ui.h"
  20 #include "cmdparser.h"
  21 #include "cmdmain.h"
  22 #include "cmddata.h"
  23 #include "cmdlf.h"
  24 #include "cmdlfhid.h"
  25 #include "cmdlfti.h"
  26 #include "cmdlfem4x.h"
  27 #include "cmdlfhitag.h"
  28 #include "cmdlft55xx.h"
  29 #include "cmdlfpcf7931.h"
  30
  31 static int CmdHelp(const char *Cmd);
  32
  33 /* send a command before reading */
  34 int CmdLFCommandRead(const char *Cmd)
  35 {
  36   static char dummy[3];
  37
  38   dummy[0]= ' ';
  39
  40   UsbCommand c = {CMD_MOD_THEN_ACQUIRE_RAW_ADC_SAMPLES_125K};
  41   sscanf(Cmd, "%"lli" %"lli" %"lli" %s %s", &c.arg[0], &c.arg[1], &c.arg[2],(char*)(&c.d.asBytes),(char*)(&dummy+1));
  42   // in case they specified 'h'
  43   strcpy((char *)&c.d.asBytes + strlen((char *)c.d.asBytes), dummy);
  44   SendCommand(&c);
  45   return 0;
  46 }
  47
  48 int CmdFlexdemod(const char *Cmd)
  49 {
  50   int i;
  51   for (i = 0; i < GraphTraceLen; ++i) {
  52     if (GraphBuffer[i] < 0) {
  53       GraphBuffer[i] = -1;
  54     } else {
  55       GraphBuffer[i] = 1;
  56     }
  57   }
  58
  59 #define LONG_WAIT 100
  60   int start;
  61   for (start = 0; start < GraphTraceLen - LONG_WAIT; start++) {
  62     int first = GraphBuffer[start];
  63     for (i = start; i < start + LONG_WAIT; i++) {
  64       if (GraphBuffer[i] != first) {
  65         break;
  66       }
  67     }
  68     if (i == (start + LONG_WAIT)) {
  69       break;
  70     }
  71   }
  72   if (start == GraphTraceLen - LONG_WAIT) {
  73     PrintAndLog("nothing to wait for");
  74     return 0;
  75   }
  76
  77   GraphBuffer[start] = 2;
  78   GraphBuffer[start+1] = -2;
  79
  80   uint8_t bits[64];
  81
  82   int bit;
  83   i = start;
  84   for (bit = 0; bit < 64; bit++) {
  85     int j;
  86     int sum = 0;
  87     for (j = 0; j < 16; j++) {
  88       sum += GraphBuffer[i++];
  89     }
  90     if (sum > 0) {
  91       bits[bit] = 1;
  92     } else {
  93       bits[bit] = 0;
  94     }
  95     PrintAndLog("bit %d sum %d", bit, sum);
  96   }
  97
  98   for (bit = 0; bit < 64; bit++) {
  99     int j;
 100     int sum = 0;
 101     for (j = 0; j < 16; j++) {
 102       sum += GraphBuffer[i++];
 103     }
 104     if (sum > 0 && bits[bit] != 1) {
 105       PrintAndLog("oops1 at %d", bit);
 106     }
 107     if (sum < 0 && bits[bit] != 0) {
 108       PrintAndLog("oops2 at %d", bit);
 109     }
 110   }
 111
 112   GraphTraceLen = 32*64;
 113   i = 0;
 114   int phase = 0;
 115   for (bit = 0; bit < 64; bit++) {
 116     if (bits[bit] == 0) {
 117       phase = 0;
 118     } else {
 119       phase = 1;
 120     }
 121     int j;
 122     for (j = 0; j < 32; j++) {
 123       GraphBuffer[i++] = phase;
 124       phase = !phase;
 125     }
 126   }
 127
 128   RepaintGraphWindow();
 129   return 0;
 130 }
 131
 132 int CmdIndalaDemod(const char *Cmd)
 133 {
 134   // Usage: recover 64bit UID by default, specify "224" as arg to recover a 224bit UID
 135
 136   int state = -1;
 137   int count = 0;
 138   int i, j;
 139   // worst case with GraphTraceLen=64000 is < 4096
 140   // under normal conditions it's < 2048
 141   uint8_t rawbits[4096];
 142   int rawbit = 0;
 143   int worst = 0, worstPos = 0;
 144   PrintAndLog("Expecting a bit less than %d raw bits", GraphTraceLen / 32);
 145   for (i = 0; i < GraphTraceLen-1; i += 2) {
 146     count += 1;
 147     if ((GraphBuffer[i] > GraphBuffer[i + 1]) && (state != 1)) {
 148       if (state == 0) {
 149         for (j = 0; j <  count - 8; j += 16) {
 150           rawbits[rawbit++] = 0;
 151         }
 152         if ((abs(count - j)) > worst) {
 153           worst = abs(count - j);
 154           worstPos = i;
 155         }
 156       }
 157       state = 1;
 158       count = 0;
 159     } else if ((GraphBuffer[i] < GraphBuffer[i + 1]) && (state != 0)) {
 160       if (state == 1) {
 161         for (j = 0; j <  count - 8; j += 16) {
 162           rawbits[rawbit++] = 1;
 163         }
 164         if ((abs(count - j)) > worst) {
 165           worst = abs(count - j);
 166           worstPos = i;
 167         }
 168       }
 169       state = 0;
 170       count = 0;
 171     }
 172   }
 173   PrintAndLog("Recovered %d raw bits", rawbit);
 174   PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
 175
 176   // Finding the start of a UID
 177   int uidlen, long_wait;
 178   if (strcmp(Cmd, "224") == 0) {
 179     uidlen = 224;
 180     long_wait = 30;
 181   } else {
 182     uidlen = 64;
 183     long_wait = 29;
 184   }
 185   int start;
 186   int first = 0;
 187   for (start = 0; start <= rawbit - uidlen; start++) {
 188     first = rawbits[start];
 189     for (i = start; i < start + long_wait; i++) {
 190       if (rawbits[i] != first) {
 191         break;
 192       }
 193     }
 194     if (i == (start + long_wait)) {
 195       break;
 196     }
 197   }
 198   if (start == rawbit - uidlen + 1) {
 199     PrintAndLog("nothing to wait for");
 200     return 0;
 201   }
 202
 203   // Inverting signal if needed
 204   if (first == 1) {
 205     for (i = start; i < rawbit; i++) {
 206       rawbits[i] = !rawbits[i];
 207     }
 208   }
 209
 210   // Dumping UID
 211   uint8_t bits[224];
 212   char showbits[225];
 213   showbits[uidlen]='\0';
 214   int bit;
 215   i = start;
 216   int times = 0;
 217   if (uidlen > rawbit) {
 218     PrintAndLog("Warning: not enough raw bits to get a full UID");
 219     for (bit = 0; bit < rawbit; bit++) {
 220       bits[bit] = rawbits[i++];
 221       // As we cannot know the parity, let's use "." and "/"
 222       showbits[bit] = '.' + bits[bit];
 223     }
 224     showbits[bit+1]='\0';
 225     PrintAndLog("Partial UID=%s", showbits);
 226     return 0;
 227   } else {
 228     for (bit = 0; bit < uidlen; bit++) {
 229       bits[bit] = rawbits[i++];
 230       showbits[bit] = '0' + bits[bit];
 231     }
 232     times = 1;
 233   }
 234
 235   //convert UID to HEX
 236   uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 237   int idx;
 238   uid1=0;
 239   uid2=0;
 240   if (uidlen==64){
 241     for( idx=0; idx<64; idx++) {
 242         if (showbits[idx] == '0') {
 243         uid1=(uid1<<1)|(uid2>>31);
 244         uid2=(uid2<<1)|0;
 245         } else {
 246         uid1=(uid1<<1)|(uid2>>31);
 247         uid2=(uid2<<1)|1;
 248         }
 249       }
 250     PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
 251   }
 252   else {
 253     uid3=0;
 254     uid4=0;
 255     uid5=0;
 256     uid6=0;
 257     uid7=0;
 258     for( idx=0; idx<224; idx++) {
 259         uid1=(uid1<<1)|(uid2>>31);
 260         uid2=(uid2<<1)|(uid3>>31);
 261         uid3=(uid3<<1)|(uid4>>31);
 262         uid4=(uid4<<1)|(uid5>>31);
 263         uid5=(uid5<<1)|(uid6>>31);
 264         uid6=(uid6<<1)|(uid7>>31);
 265         if (showbits[idx] == '0') uid7=(uid7<<1)|0;
 266         else uid7=(uid7<<1)|1;
 267       }
 268     PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 269   }
 270
 271   // Checking UID against next occurences
 272   for (; i + uidlen <= rawbit;) {
 273     int failed = 0;
 274     for (bit = 0; bit < uidlen; bit++) {
 275       if (bits[bit] != rawbits[i++]) {
 276         failed = 1;
 277         break;
 278       }
 279     }
 280     if (failed == 1) {
 281       break;
 282     }
 283     times += 1;
 284   }
 285   PrintAndLog("Occurences: %d (expected %d)", times, (rawbit - start) / uidlen);
 286
 287   // Remodulating for tag cloning
 288   GraphTraceLen = 32*uidlen;
 289   i = 0;
 290   int phase = 0;
 291   for (bit = 0; bit < uidlen; bit++) {
 292     if (bits[bit] == 0) {
 293       phase = 0;
 294     } else {
 295       phase = 1;
 296     }
 297     int j;
 298     for (j = 0; j < 32; j++) {
 299       GraphBuffer[i++] = phase;
 300       phase = !phase;
 301     }
 302   }
 303
 304   RepaintGraphWindow();
 305   return 0;
 306 }
 307
 308 int CmdIndalaClone(const char *Cmd)
 309 {
 310   unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 311   UsbCommand c;
 312   uid1=0;
 313   uid2=0;
 314   uid3=0;
 315   uid4=0;
 316   uid5=0;
 317   uid6=0;
 318   uid7=0;
 319   int n = 0, i = 0;
 320
 321   if (strchr(Cmd,'l') != 0) {
 322     while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 323       uid1 = (uid1 << 4) | (uid2 >> 28);
 324       uid2 = (uid2 << 4) | (uid3 >> 28);
 325       uid3 = (uid3 << 4) | (uid4 >> 28);
 326       uid4 = (uid4 << 4) | (uid5 >> 28);
 327       uid5 = (uid5 << 4) | (uid6 >> 28);
 328       uid6 = (uid6 << 4) | (uid7 >> 28);
 329         uid7 = (uid7 << 4) | (n & 0xf);
 330     }
 331     PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 332     c.cmd = CMD_INDALA_CLONE_TAG_L;
 333     c.d.asDwords[0] = uid1;
 334     c.d.asDwords[1] = uid2;
 335     c.d.asDwords[2] = uid3;
 336     c.d.asDwords[3] = uid4;
 337     c.d.asDwords[4] = uid5;
 338     c.d.asDwords[5] = uid6;
 339     c.d.asDwords[6] = uid7;
 340   }
 341   else
 342   {
 343     while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 344       uid1 = (uid1 << 4) | (uid2 >> 28);
 345       uid2 = (uid2 << 4) | (n & 0xf);
 346     }
 347     PrintAndLog("Cloning 64bit tag with UID %x%08x", uid1, uid2);
 348     c.cmd = CMD_INDALA_CLONE_TAG;
 349     c.arg[0] = uid1;
 350     c.arg[1] = uid2;
 351   }
 352
 353   SendCommand(&c);
 354   return 0;
 355 }
 356
 357 int CmdLFRead(const char *Cmd)
 358 {
 359   UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_125K};
 360   // 'h' means higher-low-frequency, 134 kHz
 361   if(*Cmd == 'h') {
 362     c.arg[0] = 1;
 363   } else if (*Cmd == '\0') {
 364     c.arg[0] = 0;
 365   } else if (sscanf(Cmd, "%"lli, &c.arg[0]) != 1) {
 366     PrintAndLog("use 'read' or 'read h', or 'read <divisor>'");
 367     return 0;
 368   }
 369   SendCommand(&c);
 370   WaitForResponse(CMD_ACK,NULL);
 371   return 0;
 372 }
 373
 374 static void ChkBitstream(const char *str)
 375 {
 376   int i;
 377
 378   /* convert to bitstream if necessary */
 379   for (i = 0; i < (int)(GraphTraceLen / 2); i++)
 380   {
 381     if (GraphBuffer[i] > 1 || GraphBuffer[i] < 0)
 382     {
 383       CmdBitstream(str);
 384       break;
 385     }
 386   }
 387 }
 388
 389 int CmdLFSim(const char *Cmd)
 390 {
 391   int i;
 392   static int gap;
 393
 394   sscanf(Cmd, "%i", &gap);
 395
 396   /* convert to bitstream if necessary */
 397   ChkBitstream(Cmd);
 398
 399   PrintAndLog("Sending data, please wait...");
 400   for (i = 0; i < GraphTraceLen; i += 48) {
 401     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {i, 0, 0}};
 402     int j;
 403     for (j = 0; j < 48; j++) {
 404       c.d.asBytes[j] = GraphBuffer[i+j];
 405     }
 406     SendCommand(&c);
 407     WaitForResponse(CMD_ACK,NULL);
 408   }
 409
 410   PrintAndLog("Starting simulator...");
 411   UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
 412   SendCommand(&c);
 413   return 0;
 414 }
 415
 416 int CmdLFSimBidir(const char *Cmd)
 417 {
 418   /* Set ADC to twice the carrier for a slight supersampling */
 419   UsbCommand c = {CMD_LF_SIMULATE_BIDIR, {47, 384, 0}};
 420   SendCommand(&c);
 421   return 0;
 422 }
 423
 424 /* simulate an LF Manchester encoded tag with specified bitstream, clock rate and inter-id gap */
 425 int CmdLFSimManchester(const char *Cmd)
 426 {
 427   static int clock, gap;
 428   static char data[1024], gapstring[8];
 429
 430   /* get settings/bits */
 431   sscanf(Cmd, "%i %s %i", &clock, &data[0], &gap);
 432
 433   /* clear our graph */
 434   ClearGraph(0);
 435
 436   /* fill it with our bitstream */
 437   for (int i = 0; i < strlen(data) ; ++i)
 438     AppendGraph(0, clock, data[i]- '0');
 439
 440   /* modulate */
 441   CmdManchesterMod("");
 442
 443   /* show what we've done */
 444   RepaintGraphWindow();
 445
 446   /* simulate */
 447   sprintf(&gapstring[0], "%i", gap);
 448   CmdLFSim(gapstring);
 449   return 0;
 450 }
 451
 452 int CmdVchDemod(const char *Cmd)
 453 {
 454   // Is this the entire sync pattern, or does this also include some
 455   // data bits that happen to be the same everywhere? That would be
 456   // lovely to know.
 457   static const int SyncPattern[] = {
 458     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 459     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 460     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 461     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 462     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 463     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 464     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 465     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 466     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 467     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 468   };
 469
 470   // So first, we correlate for the sync pattern, and mark that.
 471   int bestCorrel = 0, bestPos = 0;
 472   int i;
 473   // It does us no good to find the sync pattern, with fewer than
 474   // 2048 samples after it...
 475   for (i = 0; i < (GraphTraceLen-2048); i++) {
 476     int sum = 0;
 477     int j;
 478     for (j = 0; j < arraylen(SyncPattern); j++) {
 479       sum += GraphBuffer[i+j]*SyncPattern[j];
 480     }
 481     if (sum > bestCorrel) {
 482       bestCorrel = sum;
 483       bestPos = i;
 484     }
 485   }
 486   PrintAndLog("best sync at %d [metric %d]", bestPos, bestCorrel);
 487
 488   char bits[257];
 489   bits[256] = '\0';
 490
 491   int worst = INT_MAX;
 492   int worstPos = 0;
 493
 494   for (i = 0; i < 2048; i += 8) {
 495     int sum = 0;
 496     int j;
 497     for (j = 0; j < 8; j++) {
 498       sum += GraphBuffer[bestPos+i+j];
 499     }
 500     if (sum < 0) {
 501       bits[i/8] = '.';
 502     } else {
 503       bits[i/8] = '1';
 504     }
 505     if(abs(sum) < worst) {
 506       worst = abs(sum);
 507       worstPos = i;
 508     }
 509   }
 510   PrintAndLog("bits:");
 511   PrintAndLog("%s", bits);
 512   PrintAndLog("worst metric: %d at pos %d", worst, worstPos);
 513
 514   if (strcmp(Cmd, "clone")==0) {
 515     GraphTraceLen = 0;
 516     char *s;
 517     for(s = bits; *s; s++) {
 518       int j;
 519       for(j = 0; j < 16; j++) {
 520         GraphBuffer[GraphTraceLen++] = (*s == '1') ? 1 : 0;
 521       }
 522     }
 523     RepaintGraphWindow();
 524   }
 525   return 0;
 526 }
 527
 528 static command_t CommandTable[] =
 529 {
 530   {"help",        CmdHelp,            1, "This help"},
 531   {"cmdread",     CmdLFCommandRead,   0, "<off period> <'0' period> <'1' period> <command> ['h'] -- Modulate LF reader field to send command before read (all periods in microseconds) (option 'h' for 134)"},
 532   {"em4x",        CmdLFEM4X,          1, "{ EM4X RFIDs... }"},
 533   {"flexdemod",   CmdFlexdemod,       1, "Demodulate samples for FlexPass"},
 534   {"hid",         CmdLFHID,           1, "{ HID RFIDs... }"},
 535   {"indalademod", CmdIndalaDemod,     1, "['224'] -- Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
 536   {"indalaclone", CmdIndalaClone,     1, "<UID> ['l']-- Clone Indala to T55x7 (tag must be in antenna)(UID in HEX)(option 'l' for 224 UID"},
 537   {"read",        CmdLFRead,          0, "['h'|<divisor>] -- Read 125/134 kHz LF ID-only tag (option 'h' for 134, alternatively: f=12MHz/(divisor+1))"},
 538   {"sim",         CmdLFSim,           0, "[GAP] -- Simulate LF tag from buffer with optional GAP (in microseconds)"},
 539   {"simbidir",    CmdLFSimBidir,      0, "Simulate LF tag (with bidirectional data transmission between reader and tag)"},
 540   {"simman",      CmdLFSimManchester, 0, "<Clock> <Bitstream> [GAP] Simulate arbitrary Manchester LF tag"},
 541   {"ti",          CmdLFTI,            1, "{ TI RFIDs... }"},
 542   {"hitag",       CmdLFHitag,         1, "{ Hitag tags and transponders... }"},
 543   {"vchdemod",    CmdVchDemod,        1, "['clone'] -- Demodulate samples for VeriChip"},
 544   {"t55xx",       CmdLFT55XX,         1, "{ T55xx RFIDs... }"},
 545   {"pcf7931",     CmdLFPCF7931,       1, "{PCF7931 RFIDs...}"},
 546   {NULL, NULL, 0, NULL}
 547 };
 548
 549 int CmdLF(const char *Cmd)
 550 {
 551   CmdsParse(CommandTable, Cmd);
 552   return 0;
 553 }
 554
 555 int CmdHelp(const char *Cmd)
 556 {
 557   CmdsHelp(CommandTable);
 558   return 0;
 559 }