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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 "proxmark3.h"
16 #include "data.h"
17 #include "graph.h"
18 #include "ui.h"
19 #include "cmdparser.h"
20 #include "cmdmain.h"
21 #include "cmddata.h"
22 #include "util.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 #include "cmdlfio.h"
31 #include "lfdemod.h"
32
33 static int CmdHelp(const char *Cmd);
34
35 /* send a command before reading */
36 int CmdLFCommandRead(const char *Cmd)
37 {
38 static char dummy[3];
39
40 dummy[0]= ' ';
41
42 UsbCommand c = {CMD_MOD_THEN_ACQUIRE_RAW_ADC_SAMPLES_125K};
43 sscanf(Cmd, "%"lli" %"lli" %"lli" %s %s", &c.arg[0], &c.arg[1], &c.arg[2],(char*)(&c.d.asBytes),(char*)(&dummy+1));
44 // in case they specified 'h'
45 strcpy((char *)&c.d.asBytes + strlen((char *)c.d.asBytes), dummy);
46 SendCommand(&c);
47 return 0;
48 }
49
50 int CmdFlexdemod(const char *Cmd)
51 {
52 int i;
53 for (i = 0; i < GraphTraceLen; ++i) {
54 if (GraphBuffer[i] < 0) {
55 GraphBuffer[i] = -1;
56 } else {
57 GraphBuffer[i] = 1;
58 }
59 }
60
61 #define LONG_WAIT 100
62 int start;
63 for (start = 0; start < GraphTraceLen - LONG_WAIT; start++) {
64 int first = GraphBuffer[start];
65 for (i = start; i < start + LONG_WAIT; i++) {
66 if (GraphBuffer[i] != first) {
67 break;
68 }
69 }
70 if (i == (start + LONG_WAIT)) {
71 break;
72 }
73 }
74 if (start == GraphTraceLen - LONG_WAIT) {
75 PrintAndLog("nothing to wait for");
76 return 0;
77 }
78
79 GraphBuffer[start] = 2;
80 GraphBuffer[start+1] = -2;
81 uint8_t bits[64] = {0x00};
82
83 int bit, sum;
84 i = start;
85 for (bit = 0; bit < 64; bit++) {
86 sum = 0;
87 for (int j = 0; j < 16; j++) {
88 sum += GraphBuffer[i++];
89 }
90
91 bits[bit] = (sum > 0) ? 1 : 0;
92
93 PrintAndLog("bit %d sum %d", bit, sum);
94 }
95
96 for (bit = 0; bit < 64; bit++) {
97 int j;
98 int sum = 0;
99 for (j = 0; j < 16; j++) {
100 sum += GraphBuffer[i++];
101 }
102 if (sum > 0 && bits[bit] != 1) {
103 PrintAndLog("oops1 at %d", bit);
104 }
105 if (sum < 0 && bits[bit] != 0) {
106 PrintAndLog("oops2 at %d", bit);
107 }
108 }
109
110 // HACK writing back to graphbuffer.
111 GraphTraceLen = 32*64;
112 i = 0;
113 int phase = 0;
114 for (bit = 0; bit < 64; bit++) {
115
116 phase = (bits[bit] == 0) ? 0 : 1;
117
118 int j;
119 for (j = 0; j < 32; j++) {
120 GraphBuffer[i++] = phase;
121 phase = !phase;
122 }
123 }
124
125 RepaintGraphWindow();
126 return 0;
127 }
128
129 int CmdIndalaDemod(const char *Cmd)
130 {
131 // Usage: recover 64bit UID by default, specify "224" as arg to recover a 224bit UID
132
133 int state = -1;
134 int count = 0;
135 int i, j;
136
137 // worst case with GraphTraceLen=64000 is < 4096
138 // under normal conditions it's < 2048
139
140 uint8_t rawbits[4096];
141 int rawbit = 0;
142 int worst = 0, worstPos = 0;
143 // PrintAndLog("Expecting a bit less than %d raw bits", GraphTraceLen / 32);
144 for (i = 0; i < GraphTraceLen-1; i += 2) {
145 count += 1;
146 if ((GraphBuffer[i] > GraphBuffer[i + 1]) && (state != 1)) {
147 if (state == 0) {
148 for (j = 0; j < count - 8; j += 16) {
149 rawbits[rawbit++] = 0;
150 }
151 if ((abs(count - j)) > worst) {
152 worst = abs(count - j);
153 worstPos = i;
154 }
155 }
156 state = 1;
157 count = 0;
158 } else if ((GraphBuffer[i] < GraphBuffer[i + 1]) && (state != 0)) {
159 if (state == 1) {
160 for (j = 0; j < count - 8; j += 16) {
161 rawbits[rawbit++] = 1;
162 }
163 if ((abs(count - j)) > worst) {
164 worst = abs(count - j);
165 worstPos = i;
166 }
167 }
168 state = 0;
169 count = 0;
170 }
171 }
172
173 if (rawbit>0){
174 PrintAndLog("Recovered %d raw bits, expected: %d", rawbit, GraphTraceLen/32);
175 PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
176 } else {
177 return 0;
178 }
179
180 // Finding the start of a UID
181 int uidlen, long_wait;
182 if (strcmp(Cmd, "224") == 0) {
183 uidlen = 224;
184 long_wait = 30;
185 } else {
186 uidlen = 64;
187 long_wait = 29;
188 }
189
190 int start;
191 int first = 0;
192 for (start = 0; start <= rawbit - uidlen; start++) {
193 first = rawbits[start];
194 for (i = start; i < start + long_wait; i++) {
195 if (rawbits[i] != first) {
196 break;
197 }
198 }
199 if (i == (start + long_wait)) {
200 break;
201 }
202 }
203
204 if (start == rawbit - uidlen + 1) {
205 PrintAndLog("nothing to wait for");
206 return 0;
207 }
208
209 // Inverting signal if needed
210 if (first == 1) {
211 for (i = start; i < rawbit; i++) {
212 rawbits[i] = !rawbits[i];
213 }
214 }
215
216 // Dumping UID
217 uint8_t bits[224] = {0x00};
218 char showbits[225] = {0x00};
219 int bit;
220 i = start;
221 int times = 0;
222
223 if (uidlen > rawbit) {
224 PrintAndLog("Warning: not enough raw bits to get a full UID");
225 for (bit = 0; bit < rawbit; bit++) {
226 bits[bit] = rawbits[i++];
227 // As we cannot know the parity, let's use "." and "/"
228 showbits[bit] = '.' + bits[bit];
229 }
230 showbits[bit+1]='\0';
231 PrintAndLog("Partial UID=%s", showbits);
232 return 0;
233 } else {
234 for (bit = 0; bit < uidlen; bit++) {
235 bits[bit] = rawbits[i++];
236 showbits[bit] = '0' + bits[bit];
237 }
238 times = 1;
239 }
240
241 //convert UID to HEX
242 uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
243 int idx;
244 uid1 = uid2 = 0;
245
246 if (uidlen==64){
247 for( idx=0; idx<64; idx++) {
248 if (showbits[idx] == '0') {
249 uid1=(uid1<<1)|(uid2>>31);
250 uid2=(uid2<<1)|0;
251 } else {
252 uid1=(uid1<<1)|(uid2>>31);
253 uid2=(uid2<<1)|1;
254 }
255 }
256 PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
257 }
258 else {
259 uid3 = uid4 = uid5 = uid6 = uid7 = 0;
260
261 for( idx=0; idx<224; idx++) {
262 uid1=(uid1<<1)|(uid2>>31);
263 uid2=(uid2<<1)|(uid3>>31);
264 uid3=(uid3<<1)|(uid4>>31);
265 uid4=(uid4<<1)|(uid5>>31);
266 uid5=(uid5<<1)|(uid6>>31);
267 uid6=(uid6<<1)|(uid7>>31);
268
269 if (showbits[idx] == '0')
270 uid7 = (uid7<<1) | 0;
271 else
272 uid7 = (uid7<<1) | 1;
273 }
274 PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
275 }
276
277 // Checking UID against next occurrences
278 int failed = 0;
279 for (; i + uidlen <= rawbit;) {
280 failed = 0;
281 for (bit = 0; bit < uidlen; bit++) {
282 if (bits[bit] != rawbits[i++]) {
283 failed = 1;
284 break;
285 }
286 }
287 if (failed == 1) {
288 break;
289 }
290 times += 1;
291 }
292
293 PrintAndLog("Occurrences: %d (expected %d)", times, (rawbit - start) / uidlen);
294
295 // Remodulating for tag cloning
296 // HACK: 2015-01-04 this will have an impact on our new way of seening lf commands (demod)
297 // since this changes graphbuffer data.
298 GraphTraceLen = 32*uidlen;
299 i = 0;
300 int phase = 0;
301 for (bit = 0; bit < uidlen; bit++) {
302 if (bits[bit] == 0) {
303 phase = 0;
304 } else {
305 phase = 1;
306 }
307 int j;
308 for (j = 0; j < 32; j++) {
309 GraphBuffer[i++] = phase;
310 phase = !phase;
311 }
312 }
313
314 RepaintGraphWindow();
315 return 1;
316 }
317
318 int CmdIndalaClone(const char *Cmd)
319 {
320 UsbCommand c;
321 unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;
322
323 uid1 = uid2 = uid3 = uid4 = uid5 = uid6 = uid7 = 0;
324 int n = 0, i = 0;
325
326 if (strchr(Cmd,'l') != 0) {
327 while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
328 uid1 = (uid1 << 4) | (uid2 >> 28);
329 uid2 = (uid2 << 4) | (uid3 >> 28);
330 uid3 = (uid3 << 4) | (uid4 >> 28);
331 uid4 = (uid4 << 4) | (uid5 >> 28);
332 uid5 = (uid5 << 4) | (uid6 >> 28);
333 uid6 = (uid6 << 4) | (uid7 >> 28);
334 uid7 = (uid7 << 4) | (n & 0xf);
335 }
336 PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
337 c.cmd = CMD_INDALA_CLONE_TAG_L;
338 c.d.asDwords[0] = uid1;
339 c.d.asDwords[1] = uid2;
340 c.d.asDwords[2] = uid3;
341 c.d.asDwords[3] = uid4;
342 c.d.asDwords[4] = uid5;
343 c.d.asDwords[5] = uid6;
344 c.d.asDwords[6] = uid7;
345 } else {
346 while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
347 uid1 = (uid1 << 4) | (uid2 >> 28);
348 uid2 = (uid2 << 4) | (n & 0xf);
349 }
350 PrintAndLog("Cloning 64bit tag with UID %x%08x", uid1, uid2);
351 c.cmd = CMD_INDALA_CLONE_TAG;
352 c.arg[0] = uid1;
353 c.arg[1] = uid2;
354 }
355
356 SendCommand(&c);
357 return 0;
358 }
359
360 int usage_lf_read()
361 {
362 PrintAndLog("Usage: lf read");
363 PrintAndLog("Options: ");
364 PrintAndLog(" h This help");
365 PrintAndLog(" s silent run no printout");
366 PrintAndLog("This function takes no arguments. ");
367 PrintAndLog("Use 'lf config' to set parameters.");
368 return 0;
369 }
370 int usage_lf_snoop()
371 {
372 PrintAndLog("Usage: lf snoop");
373 PrintAndLog("Options: ");
374 PrintAndLog(" h This help");
375 PrintAndLog("This function takes no arguments. ");
376 PrintAndLog("Use 'lf config' to set parameters.");
377 return 0;
378 }
379
380 int usage_lf_config()
381 {
382 PrintAndLog("Usage: lf config [H|<divisor>] [b <bps>] [d <decim>] [a 0|1]");
383 PrintAndLog("Options: ");
384 PrintAndLog(" h This help");
385 PrintAndLog(" L Low frequency (125 KHz)");
386 PrintAndLog(" H High frequency (134 KHz)");
387 PrintAndLog(" q <divisor> Manually set divisor. 88-> 134KHz, 95-> 125 Hz");
388 PrintAndLog(" b <bps> Sets resolution of bits per sample. Default (max): 8");
389 PrintAndLog(" d <decim> Sets decimation. A value of N saves only 1 in N samples. Default: 1");
390 PrintAndLog(" a [0|1] Averaging - if set, will average the stored sample value when decimating. Default: 1");
391 PrintAndLog(" t <threshold> Sets trigger threshold. 0 means no threshold");
392 PrintAndLog("Examples:");
393 PrintAndLog(" lf config b 8 L");
394 PrintAndLog(" Samples at 125KHz, 8bps.");
395 PrintAndLog(" lf config H b 4 d 3");
396 PrintAndLog(" Samples at 134KHz, averages three samples into one, stored with ");
397 PrintAndLog(" a resolution of 4 bits per sample.");
398 PrintAndLog(" lf read");
399 PrintAndLog(" Performs a read (active field)");
400 PrintAndLog(" lf snoop");
401 PrintAndLog(" Performs a snoop (no active field)");
402 return 0;
403 }
404
405 int CmdLFSetConfig(const char *Cmd)
406 {
407
408 uint8_t divisor = 0;//Frequency divisor
409 uint8_t bps = 0; // Bits per sample
410 uint8_t decimation = 0; //How many to keep
411 bool averaging = 1; // Defaults to true
412 bool errors = FALSE;
413 int trigger_threshold =-1;//Means no change
414 uint8_t unsigned_trigg = 0;
415
416 uint8_t cmdp =0;
417 while(param_getchar(Cmd, cmdp) != 0x00)
418 {
419 switch(param_getchar(Cmd, cmdp))
420 {
421 case 'h':
422 return usage_lf_config();
423 case 'H':
424 divisor = 88;
425 cmdp++;
426 break;
427 case 'L':
428 divisor = 95;
429 cmdp++;
430 break;
431 case 'q':
432 errors |= param_getdec(Cmd,cmdp+1,&divisor);
433 cmdp+=2;
434 break;
435 case 't':
436 errors |= param_getdec(Cmd,cmdp+1,&unsigned_trigg);
437 cmdp+=2;
438 if(!errors) trigger_threshold = unsigned_trigg;
439 break;
440 case 'b':
441 errors |= param_getdec(Cmd,cmdp+1,&bps);
442 cmdp+=2;
443 break;
444 case 'd':
445 errors |= param_getdec(Cmd,cmdp+1,&decimation);
446 cmdp+=2;
447 break;
448 case 'a':
449 averaging = param_getchar(Cmd,cmdp+1) == '1';
450 cmdp+=2;
451 break;
452 default:
453 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
454 errors = 1;
455 break;
456 }
457 if(errors) break;
458 }
459 if(cmdp == 0)
460 {
461 errors = 1;// No args
462 }
463
464 //Validations
465 if(errors)
466 {
467 return usage_lf_config();
468 }
469 //Bps is limited to 8, so fits in lower half of arg1
470 if(bps >> 8) bps = 8;
471
472 sample_config config = {
473 decimation,bps,averaging,divisor,trigger_threshold
474 };
475 //Averaging is a flag on high-bit of arg[1]
476 UsbCommand c = {CMD_SET_LF_SAMPLING_CONFIG};
477 memcpy(c.d.asBytes,&config,sizeof(sample_config));
478 SendCommand(&c);
479 return 0;
480 }
481
482 int CmdLFRead(const char *Cmd)
483 {
484
485 uint8_t cmdp = 0;
486 bool arg1 = false;
487 if (param_getchar(Cmd, cmdp) == 'h')
488 {
489 return usage_lf_read();
490 }
491 if (param_getchar(Cmd, cmdp) == 's') arg1 = true; //suppress print
492 //And ship it to device
493 UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_125K, {arg1,0,0}};
494 SendCommand(&c);
495 WaitForResponse(CMD_ACK,NULL);
496 return 0;
497 }
498
499 int CmdLFSnoop(const char *Cmd)
500 {
501 uint8_t cmdp =0;
502 if(param_getchar(Cmd, cmdp) == 'h')
503 {
504 return usage_lf_snoop();
505 }
506
507 UsbCommand c = {CMD_LF_SNOOP_RAW_ADC_SAMPLES};
508 SendCommand(&c);
509 WaitForResponse(CMD_ACK,NULL);
510 return 0;
511 }
512
513 static void ChkBitstream(const char *str)
514 {
515 int i;
516
517 /* convert to bitstream if necessary */
518 for (i = 0; i < (int)(GraphTraceLen / 2); i++){
519 if (GraphBuffer[i] > 1 || GraphBuffer[i] < 0) {
520 CmdGetBitStream("");
521 break;
522 }
523 }
524 }
525 //Attempt to simulate any wave in buffer (one bit per output sample)
526 // converts GraphBuffer to bitstream (based on zero crossings) if needed.
527 int CmdLFSim(const char *Cmd)
528 {
529 int i,j;
530 static int gap;
531
532 sscanf(Cmd, "%i", &gap);
533
534 // convert to bitstream if necessary
535
536 ChkBitstream(Cmd);
537
538 //can send only 512 bits at a time (1 byte sent per bit...)
539 printf("Sending [%d bytes]", GraphTraceLen);
540 for (i = 0; i < GraphTraceLen; i += USB_CMD_DATA_SIZE) {
541 UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {i, 0, 0}};
542
543 for (j = 0; j < USB_CMD_DATA_SIZE; j++) {
544 c.d.asBytes[j] = GraphBuffer[i+j];
545 }
546 SendCommand(&c);
547 WaitForResponse(CMD_ACK,NULL);
548 printf(".");
549 }
550
551 printf("\n");
552 PrintAndLog("Starting to simulate");
553 UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
554 SendCommand(&c);
555 return 0;
556 }
557
558 int usage_lf_simfsk(void)
559 {
560 //print help
561 PrintAndLog("Usage: lf simfsk [c <clock>] [i] [H <fcHigh>] [L <fcLow>] [d <hexdata>]");
562 PrintAndLog("Options: ");
563 PrintAndLog(" h This help");
564 PrintAndLog(" c <clock> Manually set clock - can autodetect if using DemodBuffer");
565 PrintAndLog(" i invert data");
566 PrintAndLog(" H <fcHigh> Manually set the larger Field Clock");
567 PrintAndLog(" L <fcLow> Manually set the smaller Field Clock");
568 //PrintAndLog(" s TBD- -to enable a gap between playback repetitions - default: no gap");
569 PrintAndLog(" d <hexdata> Data to sim as hex - omit to sim from DemodBuffer");
570 PrintAndLog("\n NOTE: if you set one clock manually set them all manually");
571 return 0;
572 }
573
574 int usage_lf_simask(void)
575 {
576 //print help
577 PrintAndLog("Usage: lf simask [c <clock>] [i] [b|m|r] [s] [d <raw hex to sim>]");
578 PrintAndLog("Options: ");
579 PrintAndLog(" h This help");
580 PrintAndLog(" c <clock> Manually set clock - can autodetect if using DemodBuffer");
581 PrintAndLog(" i invert data");
582 PrintAndLog(" b sim ask/biphase");
583 PrintAndLog(" m sim ask/manchester - Default");
584 PrintAndLog(" r sim ask/raw");
585 PrintAndLog(" s TBD- -to enable a gap between playback repetitions - default: no gap");
586 PrintAndLog(" d <hexdata> Data to sim as hex - omit to sim from DemodBuffer");
587 return 0;
588 }
589
590 int usage_lf_simpsk(void)
591 {
592 //print help
593 PrintAndLog("Usage: lf simpsk [1|2|3] [c <clock>] [i] [r <carrier>] [d <raw hex to sim>]");
594 PrintAndLog("Options: ");
595 PrintAndLog(" h This help");
596 PrintAndLog(" c <clock> Manually set clock - can autodetect if using DemodBuffer");
597 PrintAndLog(" i invert data");
598 PrintAndLog(" 1 set PSK1 (default)");
599 PrintAndLog(" 2 set PSK2");
600 PrintAndLog(" 3 set PSK3");
601 PrintAndLog(" r <carrier> 2|4|8 are valid carriers: default = 2");
602 PrintAndLog(" d <hexdata> Data to sim as hex - omit to sim from DemodBuffer");
603 return 0;
604 }
605
606 // by marshmellow - sim ask data given clock, fcHigh, fcLow, invert
607 // - allow pull data from DemodBuffer
608 int CmdLFfskSim(const char *Cmd)
609 {
610 //might be able to autodetect FCs and clock from Graphbuffer if using demod buffer
611 // otherwise will need FChigh, FClow, Clock, and bitstream
612 uint8_t fcHigh=0, fcLow=0, clk=0;
613 uint8_t invert=0;
614 bool errors = FALSE;
615 char hexData[32] = {0x00}; // store entered hex data
616 uint8_t data[255] = {0x00};
617 int dataLen = 0;
618 uint8_t cmdp = 0;
619 while(param_getchar(Cmd, cmdp) != 0x00)
620 {
621 switch(param_getchar(Cmd, cmdp))
622 {
623 case 'h':
624 return usage_lf_simfsk();
625 case 'i':
626 invert = 1;
627 cmdp++;
628 break;
629 case 'c':
630 errors |= param_getdec(Cmd,cmdp+1,&clk);
631 cmdp+=2;
632 break;
633 case 'H':
634 errors |= param_getdec(Cmd,cmdp+1,&fcHigh);
635 cmdp+=2;
636 break;
637 case 'L':
638 errors |= param_getdec(Cmd,cmdp+1,&fcLow);
639 cmdp+=2;
640 break;
641 //case 's':
642 // separator=1;
643 // cmdp++;
644 // break;
645 case 'd':
646 dataLen = param_getstr(Cmd, cmdp+1, hexData);
647 if (dataLen==0) {
648 errors=TRUE;
649 } else {
650 dataLen = hextobinarray((char *)data, hexData);
651 }
652 if (dataLen==0) errors=TRUE;
653 if (errors) PrintAndLog ("Error getting hex data");
654 cmdp+=2;
655 break;
656 default:
657 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
658 errors = TRUE;
659 break;
660 }
661 if(errors) break;
662 }
663 if(cmdp == 0 && DemodBufferLen == 0)
664 {
665 errors = TRUE;// No args
666 }
667
668 //Validations
669 if(errors)
670 {
671 return usage_lf_simfsk();
672 }
673
674 if (dataLen == 0){ //using DemodBuffer
675 if (clk==0 || fcHigh==0 || fcLow==0){ //manual settings must set them all
676 uint8_t ans = fskClocks(&fcHigh, &fcLow, &clk, 0);
677 if (ans==0){
678 if (!fcHigh) fcHigh=10;
679 if (!fcLow) fcLow=8;
680 if (!clk) clk=50;
681 }
682 }
683 } else {
684 setDemodBuf(data, dataLen, 0);
685 }
686
687 //default if not found
688 if (clk == 0) clk = 50;
689 if (fcHigh == 0) fcHigh = 10;
690 if (fcLow == 0) fcLow = 8;
691
692 uint16_t arg1, arg2;
693 arg1 = fcHigh << 8 | fcLow;
694 arg2 = invert << 8 | clk;
695 size_t size = DemodBufferLen;
696 if (size > USB_CMD_DATA_SIZE) {
697 PrintAndLog("DemodBuffer too long for current implementation - length: %d - max: %d", size, USB_CMD_DATA_SIZE);
698 size = USB_CMD_DATA_SIZE;
699 }
700 UsbCommand c = {CMD_FSK_SIM_TAG, {arg1, arg2, size}};
701
702 memcpy(c.d.asBytes, DemodBuffer, size);
703 SendCommand(&c);
704 return 0;
705 }
706
707 // by marshmellow - sim ask data given clock, invert, manchester or raw, separator
708 // - allow pull data from DemodBuffer
709 int CmdLFaskSim(const char *Cmd)
710 {
711 //autodetect clock from Graphbuffer if using demod buffer
712 // needs clock, invert, manchester/raw as m or r, separator as s, and bitstream
713 uint8_t encoding = 1, separator = 0;
714 uint8_t clk=0, invert=0;
715 bool errors = FALSE;
716 char hexData[32] = {0x00};
717 uint8_t data[255]= {0x00}; // store entered hex data
718 int dataLen = 0;
719 uint8_t cmdp = 0;
720 while(param_getchar(Cmd, cmdp) != 0x00)
721 {
722 switch(param_getchar(Cmd, cmdp))
723 {
724 case 'h':
725 return usage_lf_simask();
726 case 'i':
727 invert = 1;
728 cmdp++;
729 break;
730 case 'c':
731 errors |= param_getdec(Cmd,cmdp+1,&clk);
732 cmdp+=2;
733 break;
734 case 'b':
735 encoding=2; //biphase
736 cmdp++;
737 break;
738 case 'm':
739 encoding=1;
740 cmdp++;
741 break;
742 case 'r':
743 encoding=0;
744 cmdp++;
745 break;
746 case 's':
747 separator=1;
748 cmdp++;
749 break;
750 case 'd':
751 dataLen = param_getstr(Cmd, cmdp+1, hexData);
752 if (dataLen==0) {
753 errors=TRUE;
754 } else {
755 dataLen = hextobinarray((char *)data, hexData);
756 }
757 if (dataLen==0) errors=TRUE;
758 if (errors) PrintAndLog ("Error getting hex data, datalen: %d",dataLen);
759 cmdp+=2;
760 break;
761 default:
762 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
763 errors = TRUE;
764 break;
765 }
766 if(errors) break;
767 }
768 if(cmdp == 0 && DemodBufferLen == 0)
769 {
770 errors = TRUE;// No args
771 }
772
773 //Validations
774 if(errors)
775 {
776 return usage_lf_simask();
777 }
778 if (dataLen == 0){ //using DemodBuffer
779 if (clk == 0) clk = GetAskClock("0", false, false);
780 } else {
781 setDemodBuf(data, dataLen, 0);
782 }
783 if (clk == 0) clk = 64;
784 if (encoding == 0) clk = clk/2; //askraw needs to double the clock speed
785 uint16_t arg1, arg2;
786 size_t size=DemodBufferLen;
787 arg1 = clk << 8 | encoding;
788 arg2 = invert << 8 | separator;
789 if (size > USB_CMD_DATA_SIZE) {
790 PrintAndLog("DemodBuffer too long for current implementation - length: %d - max: %d", size, USB_CMD_DATA_SIZE);
791 size = USB_CMD_DATA_SIZE;
792 }
793 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
794 PrintAndLog("preparing to sim ask data: %d bits", size);
795 memcpy(c.d.asBytes, DemodBuffer, size);
796 SendCommand(&c);
797 return 0;
798 }
799
800 // by marshmellow - sim psk data given carrier, clock, invert
801 // - allow pull data from DemodBuffer or parameters
802 int CmdLFpskSim(const char *Cmd)
803 {
804 //might be able to autodetect FC and clock from Graphbuffer if using demod buffer
805 //will need carrier, Clock, and bitstream
806 uint8_t carrier=0, clk=0;
807 uint8_t invert=0;
808 bool errors = FALSE;
809 char hexData[32] = {0x00}; // store entered hex data
810 uint8_t data[255] = {0x00};
811 int dataLen = 0;
812 uint8_t cmdp = 0;
813 uint8_t pskType = 1;
814 while(param_getchar(Cmd, cmdp) != 0x00)
815 {
816 switch(param_getchar(Cmd, cmdp))
817 {
818 case 'h':
819 return usage_lf_simpsk();
820 case 'i':
821 invert = 1;
822 cmdp++;
823 break;
824 case 'c':
825 errors |= param_getdec(Cmd,cmdp+1,&clk);
826 cmdp+=2;
827 break;
828 case 'r':
829 errors |= param_getdec(Cmd,cmdp+1,&carrier);
830 cmdp+=2;
831 break;
832 case '1':
833 pskType=1;
834 cmdp++;
835 break;
836 case '2':
837 pskType=2;
838 cmdp++;
839 break;
840 case '3':
841 pskType=3;
842 cmdp++;
843 break;
844 case 'd':
845 dataLen = param_getstr(Cmd, cmdp+1, hexData);
846 if (dataLen==0) {
847 errors=TRUE;
848 } else {
849 dataLen = hextobinarray((char *)data, hexData);
850 }
851 if (dataLen==0) errors=TRUE;
852 if (errors) PrintAndLog ("Error getting hex data");
853 cmdp+=2;
854 break;
855 default:
856 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
857 errors = TRUE;
858 break;
859 }
860 if (errors) break;
861 }
862 if (cmdp == 0 && DemodBufferLen == 0)
863 {
864 errors = TRUE;// No args
865 }
866
867 //Validations
868 if (errors)
869 {
870 return usage_lf_simpsk();
871 }
872 if (dataLen == 0){ //using DemodBuffer
873 PrintAndLog("Getting Clocks");
874 if (clk==0) clk = GetPskClock("", FALSE, FALSE);
875 PrintAndLog("clk: %d",clk);
876 if (!carrier) carrier = GetPskCarrier("", FALSE, FALSE);
877 PrintAndLog("carrier: %d", carrier);
878 } else {
879 setDemodBuf(data, dataLen, 0);
880 }
881
882 if (clk <= 0) clk = 32;
883 if (carrier == 0) carrier = 2;
884 if (pskType != 1){
885 if (pskType == 2){
886 //need to convert psk2 to psk1 data before sim
887 psk2TOpsk1(DemodBuffer, DemodBufferLen);
888 } else {
889 PrintAndLog("Sorry, PSK3 not yet available");
890 }
891 }
892 uint16_t arg1, arg2;
893 arg1 = clk << 8 | carrier;
894 arg2 = invert;
895 size_t size=DemodBufferLen;
896 if (size > USB_CMD_DATA_SIZE) {
897 PrintAndLog("DemodBuffer too long for current implementation - length: %d - max: %d", size, USB_CMD_DATA_SIZE);
898 size=USB_CMD_DATA_SIZE;
899 }
900 UsbCommand c = {CMD_PSK_SIM_TAG, {arg1, arg2, size}};
901 PrintAndLog("DEBUG: Sending DemodBuffer Length: %d", size);
902 memcpy(c.d.asBytes, DemodBuffer, size);
903 SendCommand(&c);
904
905 return 0;
906 }
907
908 int CmdLFSimBidir(const char *Cmd)
909 {
910 // Set ADC to twice the carrier for a slight supersampling
911 // HACK: not implemented in ARMSRC.
912 PrintAndLog("Not implemented yet.");
913 UsbCommand c = {CMD_LF_SIMULATE_BIDIR, {47, 384, 0}};
914 SendCommand(&c);
915 return 0;
916 }
917
918 int CmdVchDemod(const char *Cmd)
919 {
920 // Is this the entire sync pattern, or does this also include some
921 // data bits that happen to be the same everywhere? That would be
922 // lovely to know.
923 static const int SyncPattern[] = {
924 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
925 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
926 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
927 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
928 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
929 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
930 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
931 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
932 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
933 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
934 };
935
936 // So first, we correlate for the sync pattern, and mark that.
937 int bestCorrel = 0, bestPos = 0;
938 int i;
939 // It does us no good to find the sync pattern, with fewer than
940 // 2048 samples after it...
941 for (i = 0; i < (GraphTraceLen-2048); i++) {
942 int sum = 0;
943 int j;
944 for (j = 0; j < arraylen(SyncPattern); j++) {
945 sum += GraphBuffer[i+j]*SyncPattern[j];
946 }
947 if (sum > bestCorrel) {
948 bestCorrel = sum;
949 bestPos = i;
950 }
951 }
952 PrintAndLog("best sync at %d [metric %d]", bestPos, bestCorrel);
953
954 char bits[257];
955 bits[256] = '\0';
956
957 int worst = INT_MAX;
958 int worstPos = 0;
959
960 for (i = 0; i < 2048; i += 8) {
961 int sum = 0;
962 int j;
963 for (j = 0; j < 8; j++) {
964 sum += GraphBuffer[bestPos+i+j];
965 }
966 if (sum < 0) {
967 bits[i/8] = '.';
968 } else {
969 bits[i/8] = '1';
970 }
971 if(abs(sum) < worst) {
972 worst = abs(sum);
973 worstPos = i;
974 }
975 }
976 PrintAndLog("bits:");
977 PrintAndLog("%s", bits);
978 PrintAndLog("worst metric: %d at pos %d", worst, worstPos);
979
980 if (strcmp(Cmd, "clone")==0) {
981 GraphTraceLen = 0;
982 char *s;
983 for(s = bits; *s; s++) {
984 int j;
985 for(j = 0; j < 16; j++) {
986 GraphBuffer[GraphTraceLen++] = (*s == '1') ? 1 : 0;
987 }
988 }
989 RepaintGraphWindow();
990 }
991 return 0;
992 }
993
994 //by marshmellow
995 int CmdLFfind(const char *Cmd)
996 {
997 int ans=0;
998 char cmdp = param_getchar(Cmd, 0);
999 char testRaw = param_getchar(Cmd, 1);
1000 if (strlen(Cmd) > 3 || cmdp == 'h' || cmdp == 'H') {
1001 PrintAndLog("Usage: lf search <0|1> [u]");
1002 PrintAndLog(" <use data from Graphbuffer> , if not set, try reading data from tag.");
1003 PrintAndLog(" [Search for Unknown tags] , if not set, reads only known tags.");
1004 PrintAndLog("");
1005 PrintAndLog(" sample: lf search = try reading data from tag & search for known tags");
1006 PrintAndLog(" : lf search 1 = use data from GraphBuffer & search for known tags");
1007 PrintAndLog(" : lf search u = try reading data from tag & search for known and unknown tags");
1008 PrintAndLog(" : lf search 1 u = use data from GraphBuffer & search for known and unknown tags");
1009
1010 return 0;
1011 }
1012
1013 if (!offline && (cmdp != '1')){
1014 CmdLFRead("s");
1015 getSamples("30000",false);
1016 } else if (GraphTraceLen < 1000) {
1017 PrintAndLog("Data in Graphbuffer was too small.");
1018 return 0;
1019 }
1020 if (cmdp == 'u' || cmdp == 'U') testRaw = 'u';
1021
1022 PrintAndLog("NOTE: some demods output possible binary\n if it finds something that looks like a tag");
1023 PrintAndLog("False Positives ARE possible\n");
1024 PrintAndLog("\nChecking for known tags:\n");
1025
1026 ans=CmdFSKdemodIO("");
1027 if (ans>0) {
1028 PrintAndLog("\nValid IO Prox ID Found!");
1029 return 1;
1030 }
1031
1032 ans=CmdFSKdemodPyramid("");
1033 if (ans>0) {
1034 PrintAndLog("\nValid Pyramid ID Found!");
1035 return 1;
1036 }
1037
1038 ans=CmdFSKdemodParadox("");
1039 if (ans>0) {
1040 PrintAndLog("\nValid Paradox ID Found!");
1041 return 1;
1042 }
1043
1044 ans=CmdFSKdemodAWID("");
1045 if (ans>0) {
1046 PrintAndLog("\nValid AWID ID Found!");
1047 return 1;
1048 }
1049
1050 ans=CmdFSKdemodHID("");
1051 if (ans>0) {
1052 PrintAndLog("\nValid HID Prox ID Found!");
1053 return 1;
1054 }
1055
1056 //add psk and indala
1057 ans=CmdIndalaDecode("");
1058 if (ans>0) {
1059 PrintAndLog("\nValid Indala ID Found!");
1060 return 1;
1061 }
1062
1063 ans=CmdAskEM410xDemod("");
1064 if (ans>0) {
1065 PrintAndLog("\nValid EM410x ID Found!");
1066 return 1;
1067 }
1068
1069 ans=CmdG_Prox_II_Demod("");
1070 if (ans>0) {
1071 PrintAndLog("\nValid G Prox II ID Found!");
1072 return 1;
1073 }
1074
1075 ans=EM4x50Read("", false);
1076 if (ans>0) {
1077 PrintAndLog("\nValid EM4x50 ID Found!");
1078 return 1;
1079 }
1080 PrintAndLog("\nNo Known Tags Found!\n");
1081 if (testRaw=='u' || testRaw=='U'){
1082 //test unknown tag formats (raw mode)
1083 PrintAndLog("\nChecking for Unknown tags:\n");
1084 ans=AutoCorrelate(4000, FALSE, FALSE);
1085 if (ans > 0) PrintAndLog("Possible Auto Correlation of %d repeating samples",ans);
1086 ans=GetFskClock("",FALSE,FALSE);
1087 if (ans != 0){ //fsk
1088 ans=FSKrawDemod("",TRUE);
1089 if (ans>0) {
1090 PrintAndLog("\nUnknown FSK Modulated Tag Found!");
1091 return 1;
1092 }
1093 }
1094 ans=ASKmanDemod("0 0 0",TRUE,FALSE);
1095 if (ans>0) {
1096 PrintAndLog("\nUnknown ASK Modulated and Manchester encoded Tag Found!");
1097 PrintAndLog("\nif it does not look right it could instead be ASK/Biphase - try 'data rawdemod ab'");
1098 return 1;
1099 }
1100 ans=CmdPSK1rawDemod("");
1101 if (ans>0) {
1102 PrintAndLog("Possible unknown PSK1 Modulated Tag Found above!\n\nCould also be PSK2 - try 'data rawdemod p2'");
1103 PrintAndLog("\nCould also be PSK3 - [currently not supported]");
1104 PrintAndLog("\nCould also be NRZ - try 'data nrzrawdemod");
1105 return 1;
1106 }
1107 PrintAndLog("\nNo Data Found!\n");
1108 }
1109 return 0;
1110 }
1111
1112 static command_t CommandTable[] =
1113 {
1114 {"help", CmdHelp, 1, "This help"},
1115 {"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)"},
1116 {"em4x", CmdLFEM4X, 1, "{ EM4X RFIDs... }"},
1117 {"config", CmdLFSetConfig, 0, "Set config for LF sampling, bit/sample, decimation, frequency"},
1118 {"flexdemod", CmdFlexdemod, 1, "Demodulate samples for FlexPass"},
1119 {"hid", CmdLFHID, 1, "{ HID RFIDs... }"},
1120 {"io", CmdLFIO, 1, "{ ioProx tags... }"},
1121 {"indalademod", CmdIndalaDemod, 1, "['224'] -- Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
1122 {"indalaclone", CmdIndalaClone, 0, "<UID> ['l']-- Clone Indala to T55x7 (tag must be in antenna)(UID in HEX)(option 'l' for 224 UID"},
1123 {"read", CmdLFRead, 0, "['s' silent] Read 125/134 kHz LF ID-only tag. Do 'lf read h' for help"},
1124 {"search", CmdLFfind, 1, "[offline] ['u'] Read and Search for valid known tag (in offline mode it you can load first then search) - 'u' to search for unknown tags"},
1125 {"sim", CmdLFSim, 0, "[GAP] -- Simulate LF tag from buffer with optional GAP (in microseconds)"},
1126 {"simask", CmdLFaskSim, 0, "[clock] [invert <1|0>] [manchester/raw <'m'|'r'>] [msg separator 's'] [d <hexdata>] -- Simulate LF ASK tag from demodbuffer or input"},
1127 {"simfsk", CmdLFfskSim, 0, "[c <clock>] [i] [H <fcHigh>] [L <fcLow>] [d <hexdata>] -- Simulate LF FSK tag from demodbuffer or input"},
1128 {"simpsk", CmdLFpskSim, 0, "[1|2|3] [c <clock>] [i] [r <carrier>] [d <raw hex to sim>] -- Simulate LF PSK tag from demodbuffer or input"},
1129 {"simbidir", CmdLFSimBidir, 0, "Simulate LF tag (with bidirectional data transmission between reader and tag)"},
1130 {"snoop", CmdLFSnoop, 0, "['l'|'h'|<divisor>] [trigger threshold]-- Snoop LF (l:125khz, h:134khz)"},
1131 {"ti", CmdLFTI, 1, "{ TI RFIDs... }"},
1132 {"hitag", CmdLFHitag, 1, "{ Hitag tags and transponders... }"},
1133 {"vchdemod", CmdVchDemod, 1, "['clone'] -- Demodulate samples for VeriChip"},
1134 {"t55xx", CmdLFT55XX, 1, "{ T55xx RFIDs... }"},
1135 {"pcf7931", CmdLFPCF7931, 1, "{PCF7931 RFIDs...}"},
1136 {NULL, NULL, 0, NULL}
1137 };
1138
1139 int CmdLF(const char *Cmd)
1140 {
1141 CmdsParse(CommandTable, Cmd);
1142 return 0;
1143 }
1144
1145 int CmdHelp(const char *Cmd)
1146 {
1147 CmdsHelp(CommandTable);
1148 return 0;
1149 }
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