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a553f267 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
7fe9b0b7 11#include "cmdlfem4x.h"
0ad1a1d4 12
3c6354e9 13uint64_t g_em410xid = 0;
7fe9b0b7 14
15static int CmdHelp(const char *Cmd);
16
66707a3b 17int CmdEMdemodASK(const char *Cmd)
18{
3fe4ff4f 19 char cmdp = param_getchar(Cmd, 0);
cb1ba30a 20 uint8_t findone = (cmdp == '1') ? 1 : 0;
21 UsbCommand c = {CMD_EM410X_DEMOD, {findone, 0, 0}};
23f0a7d8 22 SendCommand(&c);
23 return 0;
66707a3b 24}
25
7fe9b0b7 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 */
34int CmdEM410xRead(const char *Cmd)
35{
23f0a7d8 36 uint32_t hi=0;
37 uint64_t lo=0;
38
fef74fdc 39 if(!AskEm410xDemod("", &hi, &lo, false)) return 0;
23f0a7d8 40 PrintAndLog("EM410x pattern found: ");
41 printEM410x(hi, lo);
42 if (hi){
43 PrintAndLog ("EM410x XL pattern found");
44 return 0;
45 }
3c6354e9 46 g_em410xid = lo;
23f0a7d8 47 return 1;
7fe9b0b7 48}
49
cb1ba30a 50
51int 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
13d77ef9 65// emulate an EM410X tag
7fe9b0b7 66int CmdEM410xSim(const char *Cmd)
67{
3fe4ff4f 68 int i, n, j, binary[4], parity[4];
3fe4ff4f 69 uint8_t uid[5] = {0x00};
70
015e3b81 71 char cmdp = param_getchar(Cmd, 0);
cb1ba30a 72 if (cmdp == 'h' || cmdp == 'H') return usage_lf_em410x_sim();
73
bca71079 74 /* clock is 64 in EM410x tags */
75 uint8_t clock = 64;
3fe4ff4f 76
77 if (param_gethex(Cmd, 0, uid, 10)) {
78 PrintAndLog("UID must include 10 HEX symbols");
79 return 0;
80 }
cb1ba30a 81
bca71079 82 param_getdec(Cmd, 1, &clock);
3fe4ff4f 83
bca71079 84 PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X clock: %d", uid[0],uid[1],uid[2],uid[3],uid[4],clock);
3fe4ff4f 85 PrintAndLog("Press pm3-button to about simulation");
7fe9b0b7 86
23f0a7d8 87 /* clear our graph */
88 ClearGraph(0);
89
015e3b81 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 }
23f0a7d8 118
015e3b81 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]);
23f0a7d8 124
015e3b81 125 /* stop bit */
23f0a7d8 126 AppendGraph(1, clock, 0);
3fe4ff4f 127
23f0a7d8 128 CmdLFSim("0"); //240 start_gap.
129 return 0;
7fe9b0b7 130}
131
3fe4ff4f 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
3fe4ff4f 140*/
7fe9b0b7 141int CmdEM410xWatch(const char *Cmd)
142{
3fe4ff4f 143 do {
144 if (ukbhit()) {
145 printf("\naborted via keyboard!\n");
146 break;
147 }
148
1fbf8956 149 CmdLFRead("s");
2767fc02 150 getSamples("8201",true); //capture enough to get 2 complete preambles (4096*2+9)
13d77ef9 151 } while (!CmdEM410xRead(""));
152
3fe4ff4f 153 return 0;
7fe9b0b7 154}
155
23f0a7d8 156//currently only supports manchester modulations
3c6354e9 157// todo: helptext
c3bfb9c7 158int CmdEM410xWatchnSpoof(const char *Cmd)
159{
3c6354e9 160 // loops if the captured ID was in XL-format.
36d87eef 161 CmdEM410xWatch(Cmd);
162 PrintAndLog("# Replaying captured ID: %llu", g_em410xid);
163 CmdLFaskSim("");
1fbf8956 164 return 0;
c3bfb9c7 165}
166
2d4eae76 167int CmdEM410xWrite(const char *Cmd)
168{
6e984446 169 uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
170 int card = 0xFF; // invalid card value
8ce3e4b4 171 uint32_t clock = 0; // invalid clock value
e67b06b7 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
e67b06b7 196 // Default: 64
8ce3e4b4 197 if (clock == 0)
198 clock = 64;
e67b06b7 199
bca71079 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);
e67b06b7 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
bca71079 212 card = (card & 0xFF) | ((clock << 8) & 0xFF00);
213 } else if (card == 0) {
e67b06b7 214 PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock);
bca71079 215 card = (card & 0xFF) | ((clock << 8) & 0xFF00);
216 } else {
e67b06b7 217 PrintAndLog("Error! Bad card type selected.\n");
218 return 0;
219 }
2d4eae76 220
6e984446 221 UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
222 SendCommand(&c);
6e984446 223 return 0;
224}
2d4eae76 225
23f0a7d8 226bool 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;
cc15a118 230 //assume last col is a parity and do not test
23f0a7d8 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
240bool 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
254uint32_t OutputEM4x50_Block(uint8_t *BitStream, size_t size, bool verbose, bool pTest)
255{
256 if (size<45) return 0;
cb1ba30a 257
23f0a7d8 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);
cb1ba30a 262
23f0a7d8 263 if (verbose || g_debugMode){
264 for (uint8_t i = 0; i<5; i++){
cc15a118 265 if (i == 4) PrintAndLog(""); //parity byte spacer
23f0a7d8 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 }
23f0a7d8 284 return code;
285}
ff9c043d 286/* Read the transmitted data of an EM4x50 tag from the graphbuffer
7fe9b0b7 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 */
cc15a118 305 //completed by Marshmellow
23f0a7d8 306int EM4x50Read(const char *Cmd, bool verbose)
307{
ff9c043d 308
cc15a118 309 uint8_t fndClk[] = {8,16,32,40,50,64,128};
23f0a7d8 310 int clk = 0;
311 int invert = 0;
23f0a7d8 312 int tol = 0;
313 int i, j, startblock, skip, block, start, end, low, high, minClk;
cc15a118 314 bool complete = false;
23f0a7d8 315 int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
23f0a7d8 316 uint32_t Code[6];
317 char tmp[6];
23f0a7d8 318 char tmp2[20];
49bbc60a 319 int phaseoff;
cc15a118 320 high = low = 0;
23f0a7d8 321 memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
cc15a118 322
323 // get user entry if any
324 sscanf(Cmd, "%i %i", &clk, &invert);
325
326 // save GraphBuffer - to restore it later
327 save_restoreGB(1);
328
23f0a7d8 329 // first get high and low values
cc15a118 330 for (i = 0; i < GraphTraceLen; i++) {
23f0a7d8 331 if (GraphBuffer[i] > high)
332 high = GraphBuffer[i];
333 else if (GraphBuffer[i] < low)
334 low = GraphBuffer[i];
335 }
336
cc15a118 337 i = 0;
338 j = 0;
339 minClk = 255;
340 // get to first full low to prime loop and skip incomplete first pulse
341 while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
342 ++i;
343 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
344 ++i;
345 skip = i;
346
347 // populate tmpbuff buffer with pulse lengths
348 while (i < GraphTraceLen) {
23f0a7d8 349 // measure from low to low
cc15a118 350 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
23f0a7d8 351 ++i;
352 start= i;
cc15a118 353 while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
23f0a7d8 354 ++i;
cc15a118 355 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
23f0a7d8 356 ++i;
357 if (j>=(MAX_GRAPH_TRACE_LEN/64)) {
358 break;
359 }
360 tmpbuff[j++]= i - start;
cc15a118 361 if (i-start < minClk && i < GraphTraceLen) {
362 minClk = i - start;
363 }
23f0a7d8 364 }
365 // set clock
cc15a118 366 if (!clk) {
23f0a7d8 367 for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
368 tol = fndClk[clkCnt]/8;
cc15a118 369 if (minClk >= fndClk[clkCnt]-tol && minClk <= fndClk[clkCnt]+1) {
23f0a7d8 370 clk=fndClk[clkCnt];
371 break;
372 }
373 }
cb1ba30a 374 if (!clk) {
375 PrintAndLog("ERROR: EM4x50 - didn't find a clock");
376 return 0;
377 }
6e984446 378 } else tol = clk/8;
23f0a7d8 379
380 // look for data start - should be 2 pairs of LW (pulses of clk*3,clk*2)
cc15a118 381 start = -1;
382 for (i= 0; i < j - 4 ; ++i) {
23f0a7d8 383 skip += tmpbuff[i];
cc15a118 384 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
385 if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
386 if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
387 if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
23f0a7d8 388 {
389 start= i + 4;
390 break;
391 }
392 }
cc15a118 393 startblock = i + 4;
23f0a7d8 394
395 // skip over the remainder of LW
49bbc60a 396 skip += tmpbuff[i+1] + tmpbuff[i+2] + clk;
397 if (tmpbuff[i+3]>clk)
398 phaseoff = tmpbuff[i+3]-clk;
399 else
400 phaseoff = 0;
23f0a7d8 401 // now do it again to find the end
402 end = skip;
cc15a118 403 for (i += 3; i < j - 4 ; ++i) {
23f0a7d8 404 end += tmpbuff[i];
cc15a118 405 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
406 if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
407 if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
408 if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
23f0a7d8 409 {
410 complete= true;
411 break;
412 }
413 }
414 end = i;
415 // report back
416 if (verbose || g_debugMode) {
417 if (start >= 0) {
cc15a118 418 PrintAndLog("\nNote: one block = 50 bits (32 data, 12 parity, 6 marker)");
23f0a7d8 419 } else {
cc15a118 420 PrintAndLog("No data found!, clock tried:%d",clk);
23f0a7d8 421 PrintAndLog("Try again with more samples.");
cc15a118 422 PrintAndLog(" or after a 'data askedge' command to clean up the read");
23f0a7d8 423 return 0;
424 }
23f0a7d8 425 } else if (start < 0) return 0;
cc15a118 426 start = skip;
23f0a7d8 427 snprintf(tmp2, sizeof(tmp2),"%d %d 1000 %d", clk, invert, clk*47);
428 // get rid of leading crap
cc15a118 429 snprintf(tmp, sizeof(tmp), "%i", skip);
23f0a7d8 430 CmdLtrim(tmp);
431 bool pTest;
cc15a118 432 bool AllPTest = true;
23f0a7d8 433 // now work through remaining buffer printing out data blocks
434 block = 0;
435 i = startblock;
cc15a118 436 while (block < 6) {
23f0a7d8 437 if (verbose || g_debugMode) PrintAndLog("\nBlock %i:", block);
438 skip = phaseoff;
439
440 // look for LW before start of next block
cc15a118 441 for ( ; i < j - 4 ; ++i) {
23f0a7d8 442 skip += tmpbuff[i];
443 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol)
444 if (tmpbuff[i+1] >= clk-tol)
445 break;
446 }
49bbc60a 447 if (i >= j-4) break; //next LW not found
23f0a7d8 448 skip += clk;
49bbc60a 449 if (tmpbuff[i+1]>clk)
450 phaseoff = tmpbuff[i+1]-clk;
451 else
452 phaseoff = 0;
23f0a7d8 453 i += 2;
fef74fdc 454 if (ASKDemod(tmp2, false, false, 1) < 1) {
cc15a118 455 save_restoreGB(0);
456 return 0;
457 }
23f0a7d8 458 //set DemodBufferLen to just one block
459 DemodBufferLen = skip/clk;
460 //test parities
461 pTest = EM_ByteParityTest(DemodBuffer,DemodBufferLen,5,9,0);
462 pTest &= EM_EndParityTest(DemodBuffer,DemodBufferLen,5,9,0);
463 AllPTest &= pTest;
464 //get output
cc15a118 465 Code[block] = OutputEM4x50_Block(DemodBuffer,DemodBufferLen,verbose, pTest);
466 if (g_debugMode) PrintAndLog("\nskipping %d samples, bits:%d", skip, skip/clk);
23f0a7d8 467 //skip to start of next block
468 snprintf(tmp,sizeof(tmp),"%i",skip);
469 CmdLtrim(tmp);
470 block++;
cc15a118 471 if (i >= end) break; //in case chip doesn't output 6 blocks
23f0a7d8 472 }
473 //print full code:
474 if (verbose || g_debugMode || AllPTest){
49bbc60a 475 if (!complete) {
476 PrintAndLog("*** Warning!");
477 PrintAndLog("Partial data - no end found!");
478 PrintAndLog("Try again with more samples.");
479 }
cc15a118 480 PrintAndLog("Found data at sample: %i - using clock: %i", start, clk);
481 end = block;
482 for (block=0; block < end; block++){
23f0a7d8 483 PrintAndLog("Block %d: %08x",block,Code[block]);
484 }
49bbc60a 485 if (AllPTest) {
23f0a7d8 486 PrintAndLog("Parities Passed");
49bbc60a 487 } else {
23f0a7d8 488 PrintAndLog("Parities Failed");
cc15a118 489 PrintAndLog("Try cleaning the read samples with 'data askedge'");
49bbc60a 490 }
23f0a7d8 491 }
492
493 //restore GraphBuffer
494 save_restoreGB(0);
495 return (int)AllPTest;
496}
497
cb1ba30a 498int CmdEM4x50Read(const char *Cmd) {
23f0a7d8 499 return EM4x50Read(Cmd, true);
2d4eae76 500}
501
cb1ba30a 502int usage_lf_em_read(void) {
f9f5f450 503 PrintAndLog("Read EM4x05/EM4x69. Tag must be on antenna. ");
cb1ba30a 504 PrintAndLog("");
505 PrintAndLog("Usage: lf em readword [h] <address> <pwd>");
506 PrintAndLog("Options:");
507 PrintAndLog(" h - this help");
508 PrintAndLog(" address - memory address to read. (0-15)");
509 PrintAndLog(" pwd - password (hex) (optional)");
510 PrintAndLog("samples:");
511 PrintAndLog(" lf em readword 1");
512 PrintAndLog(" lf em readword 1 11223344");
23f0a7d8 513 return 0;
54a942b0 514}
f9f5f450 515
516//search for given preamble in given BitStream and return success=1 or fail=0 and startIndex
517uint8_t EMpreambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t size, size_t *startIdx)
518{
519 // Sanity check. If preamble length is bigger than bitstream length.
520 if ( size <= pLen ) return 0;
521 // em only sends preamble once, so look for it once in the first x bits
522 uint8_t foundCnt = 0;
523 for (int idx = 0; idx < size - pLen; idx++){
524 if (memcmp(BitStream+idx, preamble, pLen) == 0){
525 //first index found
526 foundCnt++;
527 if (foundCnt == 1) {
528 *startIdx = idx;
529 return 1;
530 }
531 }
532 }
533 return 0;
534}
535
536int demodEM4x05resp(uint8_t bitsNeeded) {
537 int ans = 0;
538 bool demodFound = false;
539 DemodBufferLen = 0x00;
540 // skip first two 0 bits as they might have been missed in the demod
541 uint8_t preamble[6] = {0,0,1,0,1,0};
542
543 // test for FSK wave (easiest to 99% ID)
544 if (GetFskClock("", FALSE, FALSE)) {
545 //valid fsk clocks found
546 ans = FSKrawDemod("0 0", false);
547 if (!ans) {
548 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: FSK Demod failed");
549 //return -1;
550 } else {
551 // set size to 10 to only test first 4 positions for the preamble
552 size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
553 size_t startIdx = 0;
554
555 if (g_debugMode) PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size);
556
557 uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
558 if ( errChk == 0) {
559 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
560 //return -1;
561 } else {
562 //can't test size because the preamble doesn't repeat :(
563 //meaning chances of false positives are high.
564 demodFound = true;
565 }
566 }
567 }
568
569 ans = GetPskClock("", FALSE, FALSE);
570 if (ans>0) {
571 PrintAndLog("PSK response possibly found, run `data rawd p1` to attempt to demod");
572 }
573
574 if (!demodFound) {
575 DemodBufferLen = 0x00;
576 //try biphase
577 ans = ASKbiphaseDemod("0 0 1", FALSE);
578 if (!ans) {
579 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase Demod failed");
580 //return -1;
581 } else {
582 // set size to 10 to only test first 4 positions for the preamble
583 size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
584 size_t startIdx = 0;
585
586 if (g_debugMode) PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size);
587
588 uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
589 if ( errChk == 0) {
590 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
591 //return -1;
592 } else {
593 //can't test size because the preamble doesn't repeat :(
594 //meaning chances of false positives are high.
595 demodFound = true;
596 }
597 }
598 }
599
600 if (!demodFound) {
601 DemodBufferLen = 0x00;
602 // try manchester - NOTE: ST only applies to T55x7 tags.
603 ans = ASKDemod_ext("0,0,1", false, false, 1, false);
604 if (!ans) {
605 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed");
606 //return -1;
607 } else {
608 // set size to 10 to only test first 4 positions for the preamble
609 size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
610 size_t startIdx = 0;
611
612 if (g_debugMode) PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size);
613
614 uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
615 if ( errChk == 0) {
616 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
617 //return -1;
618 } else {
619 //can't test size because the preamble doesn't repeat :(
620 //meaning chances of false positives are high.
621 demodFound = true;
622 }
623 }
624 }
625
626 if (demodFound && bitsNeeded < DemodBufferLen) {
627 setDemodBuf(DemodBuffer + ans + sizeof(preamble), bitsNeeded, 0);
628 CmdPrintDemodBuff("x");
629 return 1;
630 }
631 return -1;
632}
633
cb1ba30a 634int CmdReadWord(const char *Cmd) {
635 int addr, pwd;
636 bool usePwd = false;
637 uint8_t ctmp = param_getchar(Cmd, 0);
638 if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_read();
639
640 addr = param_get8ex(Cmd, 0, -1, 10);
641 pwd = param_get32ex(Cmd, 1, -1, 16);
23f0a7d8 642
cb1ba30a 643 if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) {
644 PrintAndLog("Address must be between 0 and 15");
23f0a7d8 645 return 1;
646 }
cb1ba30a 647 if ( pwd == -1 )
648 PrintAndLog("Reading address %d", addr);
649 else {
650 usePwd = true;
651 PrintAndLog("Reading address %d | password %08X", addr, pwd);
652 }
23f0a7d8 653
cb1ba30a 654 UsbCommand c = {CMD_EM4X_READ_WORD, {addr, pwd, usePwd}};
655 clearCommandBuffer();
23f0a7d8 656 SendCommand(&c);
cb1ba30a 657 UsbCommand resp;
658 if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)){
659 PrintAndLog("Command timed out");
660 return -1;
23f0a7d8 661 }
662
ff9c043d 663 uint8_t got[6000];
cb1ba30a 664 GetFromBigBuf(got, sizeof(got), 0);
ff9c043d 665 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) {
cb1ba30a 666 PrintAndLog("command execution time out");
ff9c043d 667 return -1;
cb1ba30a 668 }
669 setGraphBuf(got, sizeof(got));
f9f5f450 670 int testLen = (GraphTraceLen < 1000) ? GraphTraceLen : 1000;
671 if (graphJustNoise(GraphBuffer, testLen)) {
672 PrintAndLog("no tag not found");
ff9c043d 673 return -1;
674 }
675
f9f5f450 676 //need 32 bits for read word
677 demodEM4x05resp(32);
ff9c043d 678
cb1ba30a 679 return 1;
54a942b0 680}
681
cb1ba30a 682int usage_lf_em_write(void) {
f9f5f450 683 PrintAndLog("Write EM4x05/EM4x69. Tag must be on antenna. ");
cb1ba30a 684 PrintAndLog("");
685 PrintAndLog("Usage: lf em writeword [h] <address> <data> <pwd>");
686 PrintAndLog("Options:");
687 PrintAndLog(" h - this help");
688 PrintAndLog(" address - memory address to write to. (0-15)");
689 PrintAndLog(" data - data to write (hex)");
690 PrintAndLog(" pwd - password (hex) (optional)");
691 PrintAndLog("samples:");
692 PrintAndLog(" lf em writeword 1");
693 PrintAndLog(" lf em writeword 1 deadc0de 11223344");
694 return 0;
695}
696int CmdWriteWord(const char *Cmd) {
697 uint8_t ctmp = param_getchar(Cmd, 0);
698 if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_write();
699
700 bool usePwd = false;
701
702 int addr = 16; // default to invalid address
703 int data = 0xFFFFFFFF; // default to blank data
704 int pwd = 0xFFFFFFFF; // default to blank password
705
706 addr = param_get8ex(Cmd, 0, -1, 10);
707 data = param_get32ex(Cmd, 1, -1, 16);
708 pwd = param_get32ex(Cmd, 2, -1, 16);
23f0a7d8 709
23f0a7d8 710
cb1ba30a 711 if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) {
712 PrintAndLog("Address must be between 0 and 15");
23f0a7d8 713 return 1;
714 }
cb1ba30a 715 if ( pwd == -1 )
716 PrintAndLog("Writing address %d data %08X", addr, data);
717 else {
718 usePwd = true;
719 PrintAndLog("Writing address %d data %08X using password %08X", addr, data, pwd);
720 }
23f0a7d8 721
cb1ba30a 722 uint16_t flag = (addr << 8 ) | usePwd;
23f0a7d8 723
cb1ba30a 724 UsbCommand c = {CMD_EM4X_WRITE_WORD, {flag, data, pwd}};
725 clearCommandBuffer();
23f0a7d8 726 SendCommand(&c);
cb1ba30a 727 UsbCommand resp;
728 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
729 PrintAndLog("Error occurred, device did not respond during write operation.");
730 return -1;
731 }
ff9c043d 732
733 //get response if there is one
734 uint8_t got[6000]; // 8 bit preamble + 32 bit word response (max clock (128) * 40bits = 5120 samples)
735 GetFromBigBuf(got, sizeof(got), 0);
736 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 8000) ) {
737 PrintAndLog("command execution time out");
738 return -2;
739 }
740 setGraphBuf(got, sizeof(got));
741
742 int ans = 0;
743 //bool ST = true;
744 DemodBufferLen = 0x00;
745
746 //ans = ASKDemod_ext("0 0 1", FALSE, FALSE, 1, &ST);
747 ans = ASKbiphaseDemod("0 0 1", FALSE);
748 if (!ans) {
749 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed");
750 return -3;
751 }
ff9c043d 752
753 //todo: check response for 00001010 then write data for write confirmation!
754 size_t startIdx = 0, size = DemodBufferLen;
755
756 uint8_t preamble[8] = {0,0,0,0,1,0,1,0};
757 if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)){
758 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
759 return -4;
760 }
761 PrintAndLog("Write OK");
23f0a7d8 762 return 0;
54a942b0 763}
764
cb1ba30a 765static command_t CommandTable[] = {
766 {"help", CmdHelp, 1, "This help"},
767 {"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"},
768 {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag in GraphBuffer"},
769 {"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
770 {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
771 {"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" },
772 {"em410xwrite", CmdEM410xWrite, 0, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
ff9c043d 773 {"em4x50read", CmdEM4x50Read, 1, "demod data from EM4x50 tag from the graphbuffer"},
774 {"readword", CmdReadWord, 1, "read EM4x05/4x69 data"},
775 {"writeword", CmdWriteWord, 1, "write EM405/4x69 data"},
23f0a7d8 776 {NULL, NULL, 0, NULL}
7fe9b0b7 777};
778
4c36581b 779int CmdLFEM4X(const char *Cmd) {
780 clearCommandBuffer();
23f0a7d8 781 CmdsParse(CommandTable, Cmd);
782 return 0;
7fe9b0b7 783}
784
4c36581b 785int CmdHelp(const char *Cmd) {
23f0a7d8 786 CmdsHelp(CommandTable);
787 return 0;
7fe9b0b7 788}
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