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CHG: `lf em` - some minor psk detection changes.
[proxmark3-svn] / client / cmdlfem4x.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 EM4x commands
9 //-----------------------------------------------------------------------------
10
11 #include "cmdlfem4x.h"
12
13 uint64_t g_em410xid = 0;
14
15 static int CmdHelp(const char *Cmd);
16
17 int CmdEMdemodASK(const char *Cmd)
18 {
19 char cmdp = param_getchar(Cmd, 0);
20 uint8_t findone = (cmdp == '1') ? 1 : 0;
21 UsbCommand c = {CMD_EM410X_DEMOD, {findone, 0, 0}};
22 SendCommand(&c);
23 return 0;
24 }
25
26 /* Read the ID of an EM410x tag.
27 * Format:
28 * 1111 1111 1 <-- standard non-repeatable header
29 * XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID
30 * ....
31 * CCCC <-- each bit here is parity for the 10 bits above in corresponding column
32 * 0 <-- stop bit, end of tag
33 */
34 int CmdEM410xRead(const char *Cmd)
35 {
36 uint32_t hi=0;
37 uint64_t lo=0;
38
39 if(!AskEm410xDemod("", &hi, &lo, false)) return 0;
40 PrintAndLog("EM410x pattern found: ");
41 printEM410x(hi, lo);
42 if (hi){
43 PrintAndLog ("EM410x XL pattern found");
44 return 0;
45 }
46 g_em410xid = lo;
47 return 1;
48 }
49
50
51 int usage_lf_em410x_sim(void) {
52 PrintAndLog("Simulating EM410x tag");
53 PrintAndLog("");
54 PrintAndLog("Usage: lf em4x em410xsim [h] <uid> <clock>");
55 PrintAndLog("Options:");
56 PrintAndLog(" h - this help");
57 PrintAndLog(" uid - uid (10 HEX symbols)");
58 PrintAndLog(" clock - clock (32|64) (optional)");
59 PrintAndLog("samples:");
60 PrintAndLog(" lf em4x em410xsim 0F0368568B");
61 PrintAndLog(" lf em4x em410xsim 0F0368568B 32");
62 return 0;
63 }
64
65 // emulate an EM410X tag
66 int CmdEM410xSim(const char *Cmd)
67 {
68 int i, n, j, binary[4], parity[4];
69 uint8_t uid[5] = {0x00};
70
71 char cmdp = param_getchar(Cmd, 0);
72 if (cmdp == 'h' || cmdp == 'H') return usage_lf_em410x_sim();
73
74 /* clock is 64 in EM410x tags */
75 uint8_t clock = 64;
76
77 if (param_gethex(Cmd, 0, uid, 10)) {
78 PrintAndLog("UID must include 10 HEX symbols");
79 return 0;
80 }
81
82 param_getdec(Cmd, 1, &clock);
83
84 PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X clock: %d", uid[0],uid[1],uid[2],uid[3],uid[4],clock);
85 PrintAndLog("Press pm3-button to about simulation");
86
87 /* clear our graph */
88 ClearGraph(0);
89
90 /* write 9 start bits */
91 for (i = 0; i < 9; i++)
92 AppendGraph(0, clock, 1);
93
94 /* for each hex char */
95 parity[0] = parity[1] = parity[2] = parity[3] = 0;
96 for (i = 0; i < 10; i++)
97 {
98 /* read each hex char */
99 sscanf(&Cmd[i], "%1x", &n);
100 for (j = 3; j >= 0; j--, n/= 2)
101 binary[j] = n % 2;
102
103 /* append each bit */
104 AppendGraph(0, clock, binary[0]);
105 AppendGraph(0, clock, binary[1]);
106 AppendGraph(0, clock, binary[2]);
107 AppendGraph(0, clock, binary[3]);
108
109 /* append parity bit */
110 AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
111
112 /* keep track of column parity */
113 parity[0] ^= binary[0];
114 parity[1] ^= binary[1];
115 parity[2] ^= binary[2];
116 parity[3] ^= binary[3];
117 }
118
119 /* parity columns */
120 AppendGraph(0, clock, parity[0]);
121 AppendGraph(0, clock, parity[1]);
122 AppendGraph(0, clock, parity[2]);
123 AppendGraph(0, clock, parity[3]);
124
125 /* stop bit */
126 AppendGraph(1, clock, 0);
127
128 CmdLFSim("0"); //240 start_gap.
129 return 0;
130 }
131
132 /* Function is equivalent of lf read + data samples + em410xread
133 * looped until an EM410x tag is detected
134 *
135 * Why is CmdSamples("16000")?
136 * TBD: Auto-grow sample size based on detected sample rate. IE: If the
137 * rate gets lower, then grow the number of samples
138 * Changed by martin, 4000 x 4 = 16000,
139 * see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235
140 */
141 int CmdEM410xWatch(const char *Cmd)
142 {
143 do {
144 if (ukbhit()) {
145 printf("\naborted via keyboard!\n");
146 break;
147 }
148
149 CmdLFRead("s");
150 getSamples("8201",true); //capture enough to get 2 complete preambles (4096*2+9)
151 } while (!CmdEM410xRead(""));
152
153 return 0;
154 }
155
156 //currently only supports manchester modulations
157 // todo: helptext
158 int CmdEM410xWatchnSpoof(const char *Cmd)
159 {
160 // loops if the captured ID was in XL-format.
161 CmdEM410xWatch(Cmd);
162 PrintAndLog("# Replaying captured ID: %llu", g_em410xid);
163 CmdLFaskSim("");
164 return 0;
165 }
166
167 int CmdEM410xWrite(const char *Cmd)
168 {
169 uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
170 int card = 0xFF; // invalid card value
171 uint32_t clock = 0; // invalid clock value
172
173 sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock);
174
175 // Check ID
176 if (id == 0xFFFFFFFFFFFFFFFF) {
177 PrintAndLog("Error! ID is required.\n");
178 return 0;
179 }
180 if (id >= 0x10000000000) {
181 PrintAndLog("Error! Given EM410x ID is longer than 40 bits.\n");
182 return 0;
183 }
184
185 // Check Card
186 if (card == 0xFF) {
187 PrintAndLog("Error! Card type required.\n");
188 return 0;
189 }
190 if (card < 0) {
191 PrintAndLog("Error! Bad card type selected.\n");
192 return 0;
193 }
194
195 // Check Clock
196 // Default: 64
197 if (clock == 0)
198 clock = 64;
199
200 // Allowed clock rates: 16, 32, 40 and 64
201 if ((clock != 16) && (clock != 32) && (clock != 64) && (clock != 40)) {
202 PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32, 40 and 64.\n", clock);
203 return 0;
204 }
205
206 if (card == 1) {
207 PrintAndLog("Writing %s tag with UID 0x%010" PRIx64 " (clock rate: %d)", "T55x7", id, clock);
208 // NOTE: We really should pass the clock in as a separate argument, but to
209 // provide for backwards-compatibility for older firmware, and to avoid
210 // having to add another argument to CMD_EM410X_WRITE_TAG, we just store
211 // the clock rate in bits 8-15 of the card value
212 card = (card & 0xFF) | ((clock << 8) & 0xFF00);
213 } else if (card == 0) {
214 PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock);
215 card = (card & 0xFF) | ((clock << 8) & 0xFF00);
216 } else {
217 PrintAndLog("Error! Bad card type selected.\n");
218 return 0;
219 }
220
221 UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
222 SendCommand(&c);
223 return 0;
224 }
225
226 bool EM_EndParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType)
227 {
228 if (rows*cols>size) return false;
229 uint8_t colP=0;
230 //assume last col is a parity and do not test
231 for (uint8_t colNum = 0; colNum < cols-1; colNum++) {
232 for (uint8_t rowNum = 0; rowNum < rows; rowNum++) {
233 colP ^= BitStream[(rowNum*cols)+colNum];
234 }
235 if (colP != pType) return false;
236 }
237 return true;
238 }
239
240 bool EM_ByteParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType)
241 {
242 if (rows*cols>size) return false;
243 uint8_t rowP=0;
244 //assume last row is a parity row and do not test
245 for (uint8_t rowNum = 0; rowNum < rows-1; rowNum++) {
246 for (uint8_t colNum = 0; colNum < cols; colNum++) {
247 rowP ^= BitStream[(rowNum*cols)+colNum];
248 }
249 if (rowP != pType) return false;
250 }
251 return true;
252 }
253
254 uint32_t OutputEM4x50_Block(uint8_t *BitStream, size_t size, bool verbose, bool pTest)
255 {
256 if (size<45) return 0;
257
258 uint32_t code = bytebits_to_byte(BitStream,8);
259 code = code<<8 | bytebits_to_byte(BitStream+9,8);
260 code = code<<8 | bytebits_to_byte(BitStream+18,8);
261 code = code<<8 | bytebits_to_byte(BitStream+27,8);
262
263 if (verbose || g_debugMode){
264 for (uint8_t i = 0; i<5; i++){
265 if (i == 4) PrintAndLog(""); //parity byte spacer
266 PrintAndLog("%d%d%d%d%d%d%d%d %d -> 0x%02x",
267 BitStream[i*9],
268 BitStream[i*9+1],
269 BitStream[i*9+2],
270 BitStream[i*9+3],
271 BitStream[i*9+4],
272 BitStream[i*9+5],
273 BitStream[i*9+6],
274 BitStream[i*9+7],
275 BitStream[i*9+8],
276 bytebits_to_byte(BitStream+i*9,8)
277 );
278 }
279 if (pTest)
280 PrintAndLog("Parity Passed");
281 else
282 PrintAndLog("Parity Failed");
283 }
284 return code;
285 }
286 /* Read the transmitted data of an EM4x50 tag from the graphbuffer
287 * Format:
288 *
289 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
290 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
291 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
292 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
293 * CCCCCCCC <- column parity bits
294 * 0 <- stop bit
295 * LW <- Listen Window
296 *
297 * This pattern repeats for every block of data being transmitted.
298 * Transmission starts with two Listen Windows (LW - a modulated
299 * pattern of 320 cycles each (32/32/128/64/64)).
300 *
301 * Note that this data may or may not be the UID. It is whatever data
302 * is stored in the blocks defined in the control word First and Last
303 * Word Read values. UID is stored in block 32.
304 */
305 //completed by Marshmellow
306 int EM4x50Read(const char *Cmd, bool verbose)
307 {
308 uint8_t fndClk[] = {8,16,32,40,50,64,128};
309 int clk = 0;
310 int invert = 0;
311 int tol = 0;
312 int i, j, startblock, skip, block, start, end, low, high, minClk;
313 bool complete = false;
314 int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
315 uint32_t Code[6];
316 char tmp[6];
317 char tmp2[20];
318 int phaseoff;
319 high = low = 0;
320 memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
321
322 // get user entry if any
323 sscanf(Cmd, "%i %i", &clk, &invert);
324
325 // save GraphBuffer - to restore it later
326 save_restoreGB(1);
327
328 // first get high and low values
329 for (i = 0; i < GraphTraceLen; i++) {
330 if (GraphBuffer[i] > high)
331 high = GraphBuffer[i];
332 else if (GraphBuffer[i] < low)
333 low = GraphBuffer[i];
334 }
335
336 i = 0;
337 j = 0;
338 minClk = 255;
339 // get to first full low to prime loop and skip incomplete first pulse
340 while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
341 ++i;
342 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
343 ++i;
344 skip = i;
345
346 // populate tmpbuff buffer with pulse lengths
347 while (i < GraphTraceLen) {
348 // measure from low to low
349 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
350 ++i;
351 start= i;
352 while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
353 ++i;
354 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
355 ++i;
356 if (j>=(MAX_GRAPH_TRACE_LEN/64)) {
357 break;
358 }
359 tmpbuff[j++]= i - start;
360 if (i-start < minClk && i < GraphTraceLen) {
361 minClk = i - start;
362 }
363 }
364 // set clock
365 if (!clk) {
366 for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
367 tol = fndClk[clkCnt]/8;
368 if (minClk >= fndClk[clkCnt]-tol && minClk <= fndClk[clkCnt]+1) {
369 clk=fndClk[clkCnt];
370 break;
371 }
372 }
373 if (!clk) {
374 PrintAndLog("ERROR: EM4x50 - didn't find a clock");
375 return 0;
376 }
377 } else tol = clk/8;
378
379 // look for data start - should be 2 pairs of LW (pulses of clk*3,clk*2)
380 start = -1;
381 for (i= 0; i < j - 4 ; ++i) {
382 skip += tmpbuff[i];
383 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
384 if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
385 if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
386 if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
387 {
388 start= i + 4;
389 break;
390 }
391 }
392 startblock = i + 4;
393
394 // skip over the remainder of LW
395 skip += tmpbuff[i+1] + tmpbuff[i+2] + clk;
396 if (tmpbuff[i+3]>clk)
397 phaseoff = tmpbuff[i+3]-clk;
398 else
399 phaseoff = 0;
400 // now do it again to find the end
401 end = skip;
402 for (i += 3; i < j - 4 ; ++i) {
403 end += tmpbuff[i];
404 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
405 if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
406 if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
407 if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
408 {
409 complete= true;
410 break;
411 }
412 }
413 end = i;
414 // report back
415 if (verbose || g_debugMode) {
416 if (start >= 0) {
417 PrintAndLog("\nNote: one block = 50 bits (32 data, 12 parity, 6 marker)");
418 } else {
419 PrintAndLog("No data found!, clock tried:%d",clk);
420 PrintAndLog("Try again with more samples.");
421 PrintAndLog(" or after a 'data askedge' command to clean up the read");
422 return 0;
423 }
424 } else if (start < 0) return 0;
425 start = skip;
426 snprintf(tmp2, sizeof(tmp2),"%d %d 1000 %d", clk, invert, clk*47);
427 // get rid of leading crap
428 snprintf(tmp, sizeof(tmp), "%i", skip);
429 CmdLtrim(tmp);
430 bool pTest;
431 bool AllPTest = true;
432 // now work through remaining buffer printing out data blocks
433 block = 0;
434 i = startblock;
435 while (block < 6) {
436 if (verbose || g_debugMode) PrintAndLog("\nBlock %i:", block);
437 skip = phaseoff;
438
439 // look for LW before start of next block
440 for ( ; i < j - 4 ; ++i) {
441 skip += tmpbuff[i];
442 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol)
443 if (tmpbuff[i+1] >= clk-tol)
444 break;
445 }
446 if (i >= j-4) break; //next LW not found
447 skip += clk;
448 if (tmpbuff[i+1]>clk)
449 phaseoff = tmpbuff[i+1]-clk;
450 else
451 phaseoff = 0;
452 i += 2;
453 if (ASKDemod(tmp2, false, false, 1) < 1) {
454 save_restoreGB(0);
455 return 0;
456 }
457 //set DemodBufferLen to just one block
458 DemodBufferLen = skip/clk;
459 //test parities
460 pTest = EM_ByteParityTest(DemodBuffer,DemodBufferLen,5,9,0);
461 pTest &= EM_EndParityTest(DemodBuffer,DemodBufferLen,5,9,0);
462 AllPTest &= pTest;
463 //get output
464 Code[block] = OutputEM4x50_Block(DemodBuffer,DemodBufferLen,verbose, pTest);
465 if (g_debugMode) PrintAndLog("\nskipping %d samples, bits:%d", skip, skip/clk);
466 //skip to start of next block
467 snprintf(tmp,sizeof(tmp),"%i",skip);
468 CmdLtrim(tmp);
469 block++;
470 if (i >= end) break; //in case chip doesn't output 6 blocks
471 }
472 //print full code:
473 if (verbose || g_debugMode || AllPTest){
474 if (!complete) {
475 PrintAndLog("*** Warning!");
476 PrintAndLog("Partial data - no end found!");
477 PrintAndLog("Try again with more samples.");
478 }
479 PrintAndLog("Found data at sample: %i - using clock: %i", start, clk);
480 end = block;
481 for (block=0; block < end; block++){
482 PrintAndLog("Block %d: %08x",block,Code[block]);
483 }
484 if (AllPTest) {
485 PrintAndLog("Parities Passed");
486 } else {
487 PrintAndLog("Parities Failed");
488 PrintAndLog("Try cleaning the read samples with 'data askedge'");
489 }
490 }
491
492 //restore GraphBuffer
493 save_restoreGB(0);
494 return (int)AllPTest;
495 }
496
497 int CmdEM4x50Read(const char *Cmd) {
498 return EM4x50Read(Cmd, true);
499 }
500
501 int usage_lf_em_read(void) {
502 PrintAndLog("Read EM 4x05/4x50/EM4x69. Tag must be on antenna. ");
503 PrintAndLog("");
504 PrintAndLog("Usage: lf em readword [h] <address> <pwd>");
505 PrintAndLog("Options:");
506 PrintAndLog(" h - this help");
507 PrintAndLog(" address - memory address to read. (0-15)");
508 PrintAndLog(" pwd - password (hex) (optional)");
509 PrintAndLog("samples:");
510 PrintAndLog(" lf em readword 1");
511 PrintAndLog(" lf em readword 1 11223344");
512 return 0;
513 }
514
515 int usage_lf_em_write(void) {
516 PrintAndLog("Write EM 4x05/4x50/4x69. Tag must be on antenna. ");
517 PrintAndLog("");
518 PrintAndLog("Usage: lf em writeword [h] <address> <data> <pwd>");
519 PrintAndLog("Options:");
520 PrintAndLog(" h - this help");
521 PrintAndLog(" address - memory address to write to. (0-15)");
522 PrintAndLog(" data - data to write (hex)");
523 PrintAndLog(" pwd - password (hex) (optional)");
524 PrintAndLog("samples:");
525 PrintAndLog(" lf em writeword 1");
526 PrintAndLog(" lf em writeword 1 deadc0de 11223344");
527 return 0;
528 }
529
530 #define EM_PREAMBLE_LEN 6
531 // download samples from device
532 // and copy them to Graphbuffer
533 bool downloadSamplesEM(){
534
535 // 8 bit preamble + 32 bit word response (max clock (128) * 40bits = 5120 samples)
536 uint8_t got[6000];
537 GetFromBigBuf(got, sizeof(got), 0);
538 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) {
539 PrintAndLog("command execution time out");
540 return FALSE;
541 }
542 setGraphBuf(got, sizeof(got));
543 return TRUE;
544 }
545 //search for given preamble in given BitStream and return success=1 or fail=0 and startIndex
546 bool doPreambleSearch(size_t *startIdx){
547
548 // sanity check
549 if ( DemodBufferLen < EM_PREAMBLE_LEN) {
550 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 demodbuffer too small");
551 return FALSE;
552 }
553
554 // skip first two 0 bits as they might have been missed in the demod
555 uint8_t preamble[EM_PREAMBLE_LEN] = {0,0,1,0,1,0};
556
557 // set size to 10 to only test first 4 positions for the preamble
558 size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
559 *startIdx = 0;
560 uint8_t found = 0;
561
562 // em only sends preamble once, so look for it once in the first x bits
563 for (int idx = 0; idx < size - EM_PREAMBLE_LEN; idx++){
564 if (memcmp(DemodBuffer+idx, preamble, EM_PREAMBLE_LEN) == 0){
565 //first index found
566 *startIdx = idx;
567 found = 1;
568 break;
569 }
570 }
571
572 if ( !found) {
573 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", *startIdx);
574 return FALSE;
575 }
576 return TRUE;
577 }
578
579 bool detectFSK(){
580 // detect fsk clock
581 if (!GetFskClock("", FALSE, FALSE)) {
582 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: FSK clock failed");
583 return FALSE;
584 }
585 // demod
586 int ans = FSKrawDemod("0 0", FALSE);
587 if (!ans) {
588 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: FSK Demod failed");
589 return FALSE;
590 }
591 return TRUE;
592 }
593 // PSK clocks should be easy to detect ( but difficult to demod a non-repeating pattern... )
594 bool detectPSK(){
595 int ans = GetPskClock("", FALSE, FALSE);
596 if (ans <= 0) {
597 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: PSK clock failed");
598 return FALSE;
599 }
600 PrintAndLog("PSK response possibly found, run `data rawd p1` to attempt to demod");
601 return TRUE;
602 }
603 // try manchester - NOTE: ST only applies to T55x7 tags.
604 bool detectASK_MAN(){
605 bool stcheck = FALSE;
606 int ans = ASKDemod_ext("0 0 0", FALSE, FALSE, 1, &stcheck);
607 if (!ans) {
608 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed");
609 return FALSE;
610 }
611 return TRUE;
612 }
613 bool detectASK_BI(){
614 int ans = ASKbiphaseDemod("0 0 1", FALSE);
615 if (!ans) {
616 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase normal demod failed");
617
618 ans = ASKbiphaseDemod("0 1 1", FALSE);
619 if (!ans) {
620 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase inverted demod failed");
621 return FALSE;
622 }
623 }
624 return TRUE;
625 }
626
627 // param: idx - start index in demoded data.
628 int setDemodBufferEM(uint8_t bitsNeeded, size_t idx){
629 if ( bitsNeeded < DemodBufferLen) {
630 setDemodBuf(DemodBuffer + idx + EM_PREAMBLE_LEN, bitsNeeded, 0);
631 CmdPrintDemodBuff("x");
632 return 1;
633 }
634 return -1;
635 }
636
637 // FSK, PSK, ASK/MANCHESTER, ASK/BIPHASE, ASK/DIPHASE
638 // should cover 90% of known used configs
639 // the rest will need to be manually demoded for now...
640 int demodEM4x05resp(uint8_t bitsNeeded) {
641
642 size_t startIdx = 0;
643
644 if (detectASK_MAN() && doPreambleSearch( &startIdx ))
645 return setDemodBufferEM(bitsNeeded, startIdx);
646
647 if (detectASK_BI() && doPreambleSearch( &startIdx ))
648 return setDemodBufferEM(bitsNeeded, startIdx);
649
650 if (detectFSK() && doPreambleSearch( &startIdx ))
651 return setDemodBufferEM(bitsNeeded, startIdx);
652
653 if (detectPSK() && doPreambleSearch( &startIdx ))
654 return setDemodBufferEM(bitsNeeded, startIdx);
655
656 return -1;
657 }
658
659 int CmdReadWord(const char *Cmd) {
660 int addr, pwd;
661 bool usePwd = false;
662 uint8_t ctmp = param_getchar(Cmd, 0);
663 if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_read();
664
665 addr = param_get8ex(Cmd, 0, -1, 10);
666 pwd = param_get32ex(Cmd, 1, -1, 16);
667
668 if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) {
669 PrintAndLog("Address must be between 0 and 15");
670 return 1;
671 }
672 if ( pwd == -1 )
673 PrintAndLog("Reading address %d", addr);
674 else {
675 usePwd = true;
676 PrintAndLog("Reading address %d | password %08X", addr, pwd);
677 }
678
679 UsbCommand c = {CMD_EM4X_READ_WORD, {addr, pwd, usePwd}};
680 clearCommandBuffer();
681 SendCommand(&c);
682 UsbCommand resp;
683 if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)){
684 PrintAndLog("Command timed out");
685 return -1;
686 }
687
688 if (!downloadSamplesEM())
689 return -1;
690
691 int testLen = (GraphTraceLen < 1000) ? GraphTraceLen : 1000;
692 if (graphJustNoise(GraphBuffer, testLen)) {
693 PrintAndLog("Tag not found");
694 return -1;
695 }
696
697 //attempt demod:
698 //need 32 bits from a read word
699 return demodEM4x05resp(44);
700 }
701
702 int CmdWriteWord(const char *Cmd) {
703 uint8_t ctmp = param_getchar(Cmd, 0);
704 if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_write();
705
706 bool usePwd = false;
707 int addr = 16; // default to invalid address
708 int data = 0xFFFFFFFF; // default to blank data
709 int pwd = 0xFFFFFFFF; // default to blank password
710
711 addr = param_get8ex(Cmd, 0, -1, 10);
712 data = param_get32ex(Cmd, 1, -1, 16);
713 pwd = param_get32ex(Cmd, 2, -1, 16);
714
715 if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) {
716 PrintAndLog("Address must be between 0 and 15");
717 return 1;
718 }
719 if ( pwd == -1 )
720 PrintAndLog("Writing address %d data %08X", addr, data);
721 else {
722 usePwd = true;
723 PrintAndLog("Writing address %d data %08X using password %08X", addr, data, pwd);
724 }
725
726 uint16_t flag = (addr << 8 ) | usePwd;
727
728 UsbCommand c = {CMD_EM4X_WRITE_WORD, {flag, data, pwd}};
729 clearCommandBuffer();
730 SendCommand(&c);
731 UsbCommand resp;
732 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
733 PrintAndLog("Error occurred, device did not respond during write operation.");
734 return -1;
735 }
736
737 if (!downloadSamplesEM())
738 return -1;
739
740 //todo: check response for 00001010 then write data for write confirmation!
741
742 //attempt demod:
743 //need 0 bits demoded (after preamble) to verify write cmd
744 int result = demodEM4x05resp(0);
745 if (result == 1)
746 PrintAndLog("Write Verified");
747
748 return result;
749 }
750
751 static command_t CommandTable[] = {
752 {"help", CmdHelp, 1, "This help"},
753 {"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"},
754 {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag in GraphBuffer"},
755 {"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
756 {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
757 {"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" },
758 {"em410xwrite", CmdEM410xWrite, 0, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
759 {"em4x50read", CmdEM4x50Read, 1, "demod data from EM4x50 tag from the graphbuffer"},
760 {"readword", CmdReadWord, 1, "read EM4x05/4x69 data"},
761 {"writeword", CmdWriteWord, 1, "write EM405/4x69 data"},
762 {NULL, NULL, 0, NULL}
763 };
764
765 int CmdLFEM4X(const char *Cmd) {
766 clearCommandBuffer();
767 CmdsParse(CommandTable, Cmd);
768 return 0;
769 }
770
771 int CmdHelp(const char *Cmd) {
772 CmdsHelp(CommandTable);
773 return 0;
774 }
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