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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 EM4x commands | |
9 | //----------------------------------------------------------------------------- | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <string.h> | |
13 | #include <inttypes.h> | |
14 | #include "proxmark3.h" | |
15 | #include "ui.h" | |
16 | #include "util.h" | |
17 | #include "graph.h" | |
18 | #include "cmdparser.h" | |
19 | #include "cmddata.h" | |
20 | #include "cmdlf.h" | |
21 | #include "cmdmain.h" | |
22 | #include "cmdlfem4x.h" | |
23 | #include "lfdemod.h" | |
24 | ||
25 | char *global_em410xId; | |
26 | ||
27 | static int CmdHelp(const char *Cmd); | |
28 | ||
29 | int CmdEMdemodASK(const char *Cmd) | |
30 | { | |
31 | char cmdp = param_getchar(Cmd, 0); | |
32 | int findone = (cmdp == '1') ? 1 : 0; | |
33 | UsbCommand c={CMD_EM410X_DEMOD}; | |
34 | c.arg[0]=findone; | |
35 | SendCommand(&c); | |
36 | return 0; | |
37 | } | |
38 | ||
39 | /* Read the ID of an EM410x tag. | |
40 | * Format: | |
41 | * 1111 1111 1 <-- standard non-repeatable header | |
42 | * XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID | |
43 | * .... | |
44 | * CCCC <-- each bit here is parity for the 10 bits above in corresponding column | |
45 | * 0 <-- stop bit, end of tag | |
46 | */ | |
47 | int CmdEM410xRead(const char *Cmd) | |
48 | { | |
49 | uint32_t hi=0; | |
50 | uint64_t lo=0; | |
51 | ||
52 | if(!AskEm410xDemod("", &hi, &lo, false)) return 0; | |
53 | PrintAndLog("EM410x pattern found: "); | |
54 | printEM410x(hi, lo); | |
55 | if (hi){ | |
56 | PrintAndLog ("EM410x XL pattern found"); | |
57 | return 0; | |
58 | } | |
59 | char id[12] = {0x00}; | |
60 | sprintf(id, "%010"PRIx64,lo); | |
61 | ||
62 | global_em410xId = id; | |
63 | return 1; | |
64 | } | |
65 | ||
66 | // emulate an EM410X tag | |
67 | int CmdEM410xSim(const char *Cmd) | |
68 | { | |
69 | int i, n, j, binary[4], parity[4]; | |
70 | ||
71 | char cmdp = param_getchar(Cmd, 0); | |
72 | uint8_t uid[5] = {0x00}; | |
73 | ||
74 | if (cmdp == 'h' || cmdp == 'H') { | |
75 | PrintAndLog("Usage: lf em4x em410xsim <UID> <clock>"); | |
76 | PrintAndLog(""); | |
77 | PrintAndLog(" sample: lf em4x em410xsim 0F0368568B"); | |
78 | return 0; | |
79 | } | |
80 | /* clock is 64 in EM410x tags */ | |
81 | uint8_t clock = 64; | |
82 | ||
83 | if (param_gethex(Cmd, 0, uid, 10)) { | |
84 | PrintAndLog("UID must include 10 HEX symbols"); | |
85 | return 0; | |
86 | } | |
87 | param_getdec(Cmd,1, &clock); | |
88 | ||
89 | PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X clock: %d", uid[0],uid[1],uid[2],uid[3],uid[4],clock); | |
90 | PrintAndLog("Press pm3-button to about simulation"); | |
91 | ||
92 | ||
93 | /* clear our graph */ | |
94 | ClearGraph(0); | |
95 | ||
96 | /* write 9 start bits */ | |
97 | for (i = 0; i < 9; i++) | |
98 | AppendGraph(0, clock, 1); | |
99 | ||
100 | /* for each hex char */ | |
101 | parity[0] = parity[1] = parity[2] = parity[3] = 0; | |
102 | for (i = 0; i < 10; i++) | |
103 | { | |
104 | /* read each hex char */ | |
105 | sscanf(&Cmd[i], "%1x", &n); | |
106 | for (j = 3; j >= 0; j--, n/= 2) | |
107 | binary[j] = n % 2; | |
108 | ||
109 | /* append each bit */ | |
110 | AppendGraph(0, clock, binary[0]); | |
111 | AppendGraph(0, clock, binary[1]); | |
112 | AppendGraph(0, clock, binary[2]); | |
113 | AppendGraph(0, clock, binary[3]); | |
114 | ||
115 | /* append parity bit */ | |
116 | AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]); | |
117 | ||
118 | /* keep track of column parity */ | |
119 | parity[0] ^= binary[0]; | |
120 | parity[1] ^= binary[1]; | |
121 | parity[2] ^= binary[2]; | |
122 | parity[3] ^= binary[3]; | |
123 | } | |
124 | ||
125 | /* parity columns */ | |
126 | AppendGraph(0, clock, parity[0]); | |
127 | AppendGraph(0, clock, parity[1]); | |
128 | AppendGraph(0, clock, parity[2]); | |
129 | AppendGraph(0, clock, parity[3]); | |
130 | ||
131 | /* stop bit */ | |
132 | AppendGraph(1, clock, 0); | |
133 | ||
134 | CmdLFSim("0"); //240 start_gap. | |
135 | return 0; | |
136 | } | |
137 | ||
138 | /* Function is equivalent of lf read + data samples + em410xread | |
139 | * looped until an EM410x tag is detected | |
140 | * | |
141 | * Why is CmdSamples("16000")? | |
142 | * TBD: Auto-grow sample size based on detected sample rate. IE: If the | |
143 | * rate gets lower, then grow the number of samples | |
144 | * Changed by martin, 4000 x 4 = 16000, | |
145 | * see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235 | |
146 | */ | |
147 | int CmdEM410xWatch(const char *Cmd) | |
148 | { | |
149 | do { | |
150 | if (ukbhit()) { | |
151 | printf("\naborted via keyboard!\n"); | |
152 | break; | |
153 | } | |
154 | ||
155 | CmdLFRead("s"); | |
156 | getSamples("8201",true); //capture enough to get 2 complete preambles (4096*2+9) | |
157 | } while (!CmdEM410xRead("")); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | //currently only supports manchester modulations | |
163 | int CmdEM410xWatchnSpoof(const char *Cmd) | |
164 | { | |
165 | CmdEM410xWatch(Cmd); | |
166 | PrintAndLog("# Replaying captured ID: %s",global_em410xId); | |
167 | CmdLFaskSim(""); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | int CmdEM410xWrite(const char *Cmd) | |
172 | { | |
173 | uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value | |
174 | int card = 0xFF; // invalid card value | |
175 | unsigned int clock = 0; // invalid clock value | |
176 | ||
177 | sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock); | |
178 | ||
179 | // Check ID | |
180 | if (id == 0xFFFFFFFFFFFFFFFF) { | |
181 | PrintAndLog("Error! ID is required.\n"); | |
182 | return 0; | |
183 | } | |
184 | if (id >= 0x10000000000) { | |
185 | PrintAndLog("Error! Given EM410x ID is longer than 40 bits.\n"); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | // Check Card | |
190 | if (card == 0xFF) { | |
191 | PrintAndLog("Error! Card type required.\n"); | |
192 | return 0; | |
193 | } | |
194 | if (card < 0) { | |
195 | PrintAndLog("Error! Bad card type selected.\n"); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | // Check Clock | |
200 | // Default: 64 | |
201 | if (clock == 0) | |
202 | clock = 64; | |
203 | ||
204 | // Allowed clock rates: 16, 32, 40 and 64 | |
205 | if ((clock != 16) && (clock != 32) && (clock != 64) && (clock != 40)) { | |
206 | PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32, 40 and 64.\n", clock); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | if (card == 1) { | |
211 | PrintAndLog("Writing %s tag with UID 0x%010" PRIx64 " (clock rate: %d)", "T55x7", id, clock); | |
212 | // NOTE: We really should pass the clock in as a separate argument, but to | |
213 | // provide for backwards-compatibility for older firmware, and to avoid | |
214 | // having to add another argument to CMD_EM410X_WRITE_TAG, we just store | |
215 | // the clock rate in bits 8-15 of the card value | |
216 | card = (card & 0xFF) | ((clock << 8) & 0xFF00); | |
217 | } else if (card == 0) { | |
218 | PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock); | |
219 | card = (card & 0xFF) | ((clock << 8) & 0xFF00); | |
220 | } else { | |
221 | PrintAndLog("Error! Bad card type selected.\n"); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}}; | |
226 | SendCommand(&c); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | bool EM_EndParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType) | |
232 | { | |
233 | if (rows*cols>size) return false; | |
234 | uint8_t colP=0; | |
235 | //assume last col is a parity and do not test | |
236 | for (uint8_t colNum = 0; colNum < cols-1; colNum++) { | |
237 | for (uint8_t rowNum = 0; rowNum < rows; rowNum++) { | |
238 | colP ^= BitStream[(rowNum*cols)+colNum]; | |
239 | } | |
240 | if (colP != pType) return false; | |
241 | } | |
242 | return true; | |
243 | } | |
244 | ||
245 | bool EM_ByteParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType) | |
246 | { | |
247 | if (rows*cols>size) return false; | |
248 | uint8_t rowP=0; | |
249 | //assume last row is a parity row and do not test | |
250 | for (uint8_t rowNum = 0; rowNum < rows-1; rowNum++) { | |
251 | for (uint8_t colNum = 0; colNum < cols; colNum++) { | |
252 | rowP ^= BitStream[(rowNum*cols)+colNum]; | |
253 | } | |
254 | if (rowP != pType) return false; | |
255 | } | |
256 | return true; | |
257 | } | |
258 | ||
259 | uint32_t OutputEM4x50_Block(uint8_t *BitStream, size_t size, bool verbose, bool pTest) | |
260 | { | |
261 | if (size<45) return 0; | |
262 | uint32_t code = bytebits_to_byte(BitStream,8); | |
263 | code = code<<8 | bytebits_to_byte(BitStream+9,8); | |
264 | code = code<<8 | bytebits_to_byte(BitStream+18,8); | |
265 | code = code<<8 | bytebits_to_byte(BitStream+27,8); | |
266 | if (verbose || g_debugMode){ | |
267 | for (uint8_t i = 0; i<5; i++){ | |
268 | if (i == 4) PrintAndLog(""); //parity byte spacer | |
269 | PrintAndLog("%d%d%d%d%d%d%d%d %d -> 0x%02x", | |
270 | BitStream[i*9], | |
271 | BitStream[i*9+1], | |
272 | BitStream[i*9+2], | |
273 | BitStream[i*9+3], | |
274 | BitStream[i*9+4], | |
275 | BitStream[i*9+5], | |
276 | BitStream[i*9+6], | |
277 | BitStream[i*9+7], | |
278 | BitStream[i*9+8], | |
279 | bytebits_to_byte(BitStream+i*9,8) | |
280 | ); | |
281 | } | |
282 | if (pTest) | |
283 | PrintAndLog("Parity Passed"); | |
284 | else | |
285 | PrintAndLog("Parity Failed"); | |
286 | } | |
287 | return code; | |
288 | } | |
289 | /* Read the transmitted data of an EM4x50 tag from the graphbuffer | |
290 | * Format: | |
291 | * | |
292 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
293 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
294 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
295 | * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity | |
296 | * CCCCCCCC <- column parity bits | |
297 | * 0 <- stop bit | |
298 | * LW <- Listen Window | |
299 | * | |
300 | * This pattern repeats for every block of data being transmitted. | |
301 | * Transmission starts with two Listen Windows (LW - a modulated | |
302 | * pattern of 320 cycles each (32/32/128/64/64)). | |
303 | * | |
304 | * Note that this data may or may not be the UID. It is whatever data | |
305 | * is stored in the blocks defined in the control word First and Last | |
306 | * Word Read values. UID is stored in block 32. | |
307 | */ | |
308 | //completed by Marshmellow | |
309 | int EM4x50Read(const char *Cmd, bool verbose) | |
310 | { | |
311 | uint8_t fndClk[] = {8,16,32,40,50,64,128}; | |
312 | int clk = 0; | |
313 | int invert = 0; | |
314 | int tol = 0; | |
315 | int i, j, startblock, skip, block, start, end, low, high, minClk; | |
316 | bool complete = false; | |
317 | int tmpbuff[MAX_GRAPH_TRACE_LEN / 64]; | |
318 | uint32_t Code[6]; | |
319 | char tmp[6]; | |
320 | char tmp2[20]; | |
321 | int phaseoff; | |
322 | high = low = 0; | |
323 | memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64); | |
324 | ||
325 | // get user entry if any | |
326 | sscanf(Cmd, "%i %i", &clk, &invert); | |
327 | ||
328 | // save GraphBuffer - to restore it later | |
329 | save_restoreGB(1); | |
330 | ||
331 | // first get high and low values | |
332 | for (i = 0; i < GraphTraceLen; i++) { | |
333 | if (GraphBuffer[i] > high) | |
334 | high = GraphBuffer[i]; | |
335 | else if (GraphBuffer[i] < low) | |
336 | low = GraphBuffer[i]; | |
337 | } | |
338 | ||
339 | i = 0; | |
340 | j = 0; | |
341 | minClk = 255; | |
342 | // get to first full low to prime loop and skip incomplete first pulse | |
343 | while ((GraphBuffer[i] < high) && (i < GraphTraceLen)) | |
344 | ++i; | |
345 | while ((GraphBuffer[i] > low) && (i < GraphTraceLen)) | |
346 | ++i; | |
347 | skip = i; | |
348 | ||
349 | // populate tmpbuff buffer with pulse lengths | |
350 | while (i < GraphTraceLen) { | |
351 | // measure from low to low | |
352 | while ((GraphBuffer[i] > low) && (i < GraphTraceLen)) | |
353 | ++i; | |
354 | start= i; | |
355 | while ((GraphBuffer[i] < high) && (i < GraphTraceLen)) | |
356 | ++i; | |
357 | while ((GraphBuffer[i] > low) && (i < GraphTraceLen)) | |
358 | ++i; | |
359 | if (j>=(MAX_GRAPH_TRACE_LEN/64)) { | |
360 | break; | |
361 | } | |
362 | tmpbuff[j++]= i - start; | |
363 | if (i-start < minClk && i < GraphTraceLen) { | |
364 | minClk = i - start; | |
365 | } | |
366 | } | |
367 | // set clock | |
368 | if (!clk) { | |
369 | for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) { | |
370 | tol = fndClk[clkCnt]/8; | |
371 | if (minClk >= fndClk[clkCnt]-tol && minClk <= fndClk[clkCnt]+1) { | |
372 | clk=fndClk[clkCnt]; | |
373 | break; | |
374 | } | |
375 | } | |
376 | if (!clk) return 0; | |
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 | { | |
499 | return EM4x50Read(Cmd, true); | |
500 | } | |
501 | ||
502 | int usage_lf_em_read(void) { | |
503 | PrintAndLog("Read EM4x05/EM4x69. Tag must be on antenna. "); | |
504 | PrintAndLog(""); | |
505 | PrintAndLog("Usage: lf em 4x05readword [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 4x05readword 1"); | |
512 | PrintAndLog(" lf em 4x05readword 1 11223344"); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | //search for given preamble in given BitStream and return success=1 or fail=0 and startIndex | |
517 | bool EMpreambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t size, size_t *startIdx) { | |
518 | // Sanity check. If preamble length is bigger than bitstream length. | |
519 | if ( size <= pLen ) return false; | |
520 | // em only sends preamble once, so look for it once in the first x bits | |
521 | uint8_t foundCnt = 0; | |
522 | for (size_t idx = 0; idx < size - pLen; idx++){ | |
523 | if (memcmp(BitStream+idx, preamble, pLen) == 0){ | |
524 | //first index found | |
525 | foundCnt++; | |
526 | if (foundCnt == 1) { | |
527 | if (g_debugMode) PrintAndLog("DEBUG: preamble found at %u", idx); | |
528 | *startIdx = idx; | |
529 | ||
530 | return true; | |
531 | } | |
532 | } | |
533 | } | |
534 | return false; | |
535 | } | |
536 | ||
537 | bool EM4x05testDemodReadData(uint32_t *word, bool readCmd) { | |
538 | // skip first two 0 bits as they might have been missed in the demod | |
539 | uint8_t preamble[6] = {0,0,1,0,1,0}; | |
540 | size_t startIdx = 0; | |
541 | // set size to 10 to only test first 4 positions for the preamble | |
542 | size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10; | |
543 | startIdx = 0; | |
544 | ||
545 | //test preamble | |
546 | bool errChk = EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx); | |
547 | if ( !errChk ) { | |
548 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx); | |
549 | return false; | |
550 | } | |
551 | if (readCmd) { | |
552 | //test for even parity bits. | |
553 | size = removeParity(DemodBuffer, startIdx + sizeof(preamble),9,0,44); | |
554 | if (size == 0) { | |
555 | if (g_debugMode) PrintAndLog("DEBUG: Error - Parity not detected"); | |
556 | return false; | |
557 | } | |
558 | ||
559 | //todo test last 8 bits for even parity || (xor) | |
560 | ||
561 | setDemodBuf(DemodBuffer, 40, 0); | |
562 | ||
563 | *word = bytebits_to_byteLSBF(DemodBuffer , 32); | |
564 | ||
565 | uint8_t lo = (uint8_t) bytebits_to_byteLSBF(DemodBuffer , 8); | |
566 | uint8_t lo2 = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 8, 8); | |
567 | uint8_t hi = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 16, 8); | |
568 | uint8_t hi2 = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 24, 8); | |
569 | uint8_t cs = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 32, 8); | |
570 | uint8_t cs2 = lo ^ lo2 ^ hi ^ hi2; | |
571 | if (g_debugMode) PrintAndLog("EM4x05/4x69 : %08X CS: %02X %s",*word,cs, (cs2==cs) ? "Passed" : "Failed"); | |
572 | ||
573 | return (cs2==cs) ? true : false; | |
574 | } | |
575 | return true; | |
576 | } | |
577 | ||
578 | // FSK, PSK, ASK/MANCHESTER, ASK/BIPHASE, ASK/DIPHASE | |
579 | // should cover 90% of known used configs | |
580 | // the rest will need to be manually demoded for now... | |
581 | int demodEM4x05resp(uint32_t *word, bool readCmd) { | |
582 | int ans = 0; | |
583 | bool demodFound = false; | |
584 | DemodBufferLen = 0x00; | |
585 | ||
586 | // test for FSK wave (easiest to 99% ID) | |
587 | if (GetFskClock("", FALSE, FALSE)) { | |
588 | //valid fsk clocks found | |
589 | ans = FSKrawDemod("0 0", false); | |
590 | if (!ans) { | |
591 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: FSK Demod failed"); | |
592 | } else { | |
593 | if (EM4x05testDemodReadData(word, readCmd)) { | |
594 | return 1; | |
595 | } | |
596 | } | |
597 | } | |
598 | // PSK clocks should be easy to detect ( but difficult to demod a non-repeating pattern... ) | |
599 | if (!demodFound) { | |
600 | ans = GetPskClock("", FALSE, FALSE); | |
601 | if (ans>0) { | |
602 | PrintAndLog("PSK response possibly found, run `data rawd p1` to attempt to demod"); | |
603 | } | |
604 | } | |
605 | ||
606 | // more common than biphase | |
607 | if (!demodFound) { | |
608 | DemodBufferLen = 0x00; | |
609 | bool stcheck = false; | |
610 | // try manchester - NOTE: ST only applies to T55x7 tags. | |
611 | ans = ASKDemod_ext("0,0,1", false, false, 1, &stcheck); | |
612 | if (!ans) { | |
613 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed"); | |
614 | } else { | |
615 | if (EM4x05testDemodReadData(word, readCmd)) { | |
616 | return 1; | |
617 | } | |
618 | } | |
619 | } | |
620 | ||
621 | if (!demodFound) { | |
622 | DemodBufferLen = 0x00; | |
623 | //try biphase | |
624 | ans = ASKbiphaseDemod("0 0 1", FALSE); | |
625 | if (!ans) { | |
626 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase Demod failed"); | |
627 | } else { | |
628 | if (EM4x05testDemodReadData(word, readCmd)) { | |
629 | return 1; | |
630 | } | |
631 | } | |
632 | } | |
633 | ||
634 | if (!demodFound) { | |
635 | DemodBufferLen = 0x00; | |
636 | //try diphase (differential biphase or inverted) | |
637 | ans = ASKbiphaseDemod("0 1 1", FALSE); | |
638 | if (!ans) { | |
639 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase Demod failed"); | |
640 | } else { | |
641 | if (EM4x05testDemodReadData(word, readCmd)) { | |
642 | return 1; | |
643 | } | |
644 | } | |
645 | } | |
646 | ||
647 | /*if (demodFound && bitsNeeded < DemodBufferLen) { | |
648 | if (bitsNeeded > 0) { | |
649 | setDemodBuf(DemodBuffer + startIdx + sizeof(preamble), bitsNeeded, 0); | |
650 | CmdPrintDemodBuff("x"); | |
651 | } | |
652 | return 1; | |
653 | }*/ | |
654 | return -1; | |
655 | } | |
656 | ||
657 | int EM4x05ReadWord(uint8_t addr, uint32_t pwd, bool usePwd) { | |
658 | UsbCommand c = {CMD_EM4X_READ_WORD, {addr, pwd, usePwd}}; | |
659 | clearCommandBuffer(); | |
660 | SendCommand(&c); | |
661 | UsbCommand resp; | |
662 | if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)){ | |
663 | PrintAndLog("Command timed out"); | |
664 | return -1; | |
665 | } | |
666 | ||
667 | uint8_t got[6000]; | |
668 | GetFromBigBuf(got, sizeof(got), 0); | |
669 | if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) { | |
670 | PrintAndLog("command execution time out"); | |
671 | return -1; | |
672 | } | |
673 | setGraphBuf(got, sizeof(got)); | |
674 | int testLen = (GraphTraceLen < 1000) ? GraphTraceLen : 1000; | |
675 | if (graphJustNoise(GraphBuffer, testLen)) { | |
676 | PrintAndLog("no tag not found"); | |
677 | return -1; | |
678 | } | |
679 | //attempt demod: | |
680 | uint32_t wordData = 0; | |
681 | int success = demodEM4x05resp(&wordData, true); | |
682 | if (success == 1) PrintAndLog("Got Address %02d | %08X",addr,wordData); | |
683 | return success; | |
684 | } | |
685 | ||
686 | int CmdEM4x05ReadWord(const char *Cmd) { | |
687 | uint8_t addr; | |
688 | uint32_t pwd; | |
689 | bool usePwd = false; | |
690 | uint8_t ctmp = param_getchar(Cmd, 0); | |
691 | if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_read(); | |
692 | ||
693 | addr = param_get8ex(Cmd, 0, 50, 10); | |
694 | // for now use default input of 1 as invalid (unlikely 1 will be a valid password...) | |
695 | pwd = param_get32ex(Cmd, 1, 1, 16); | |
696 | ||
697 | if ( (addr > 15) ) { | |
698 | PrintAndLog("Address must be between 0 and 15"); | |
699 | return 1; | |
700 | } | |
701 | if ( pwd == 1 ) | |
702 | PrintAndLog("Reading address %02u", addr); | |
703 | else { | |
704 | usePwd = true; | |
705 | PrintAndLog("Reading address %02u | password %08X", addr, pwd); | |
706 | } | |
707 | return EM4x05ReadWord(addr, pwd, usePwd); | |
708 | } | |
709 | ||
710 | int usage_lf_em_dump(void) { | |
711 | PrintAndLog("Dump EM4x05/EM4x69. Tag must be on antenna. "); | |
712 | PrintAndLog(""); | |
713 | PrintAndLog("Usage: lf em 4x05dump [h] <pwd>"); | |
714 | PrintAndLog("Options:"); | |
715 | PrintAndLog(" h - this help"); | |
716 | PrintAndLog(" pwd - password (hex) (optional)"); | |
717 | PrintAndLog("samples:"); | |
718 | PrintAndLog(" lf em 4x05dump"); | |
719 | PrintAndLog(" lf em 4x05dump 11223344"); | |
720 | return 0; | |
721 | } | |
722 | ||
723 | int CmdEM4x05dump(const char *Cmd) { | |
724 | uint8_t addr = 0; | |
725 | uint32_t pwd; | |
726 | bool usePwd = false; | |
727 | uint8_t ctmp = param_getchar(Cmd, 0); | |
728 | if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_dump(); | |
729 | ||
730 | // for now use default input of 1 as invalid (unlikely 1 will be a valid password...) | |
731 | pwd = param_get32ex(Cmd, 0, 1, 16); | |
732 | ||
733 | if ( pwd != 1 ) { | |
734 | usePwd = true; | |
735 | } | |
736 | int success = 1; | |
737 | for (; addr < 16; addr++) { | |
738 | if (addr == 2) { | |
739 | if (usePwd) { | |
740 | PrintAndLog("PWD Address %02u | %08X",addr,pwd); | |
741 | } else { | |
742 | PrintAndLog("PWD Address 02 | cannot read"); | |
743 | } | |
744 | } else { | |
745 | success &= EM4x05ReadWord(addr, pwd, usePwd); | |
746 | } | |
747 | } | |
748 | ||
749 | return success; | |
750 | } | |
751 | ||
752 | ||
753 | int usage_lf_em_write(void) { | |
754 | PrintAndLog("Write EM4x05/EM4x69. Tag must be on antenna. "); | |
755 | PrintAndLog(""); | |
756 | PrintAndLog("Usage: lf em 4x05writeword [h] <address> <data> <pwd>"); | |
757 | PrintAndLog("Options:"); | |
758 | PrintAndLog(" h - this help"); | |
759 | PrintAndLog(" address - memory address to write to. (0-15)"); | |
760 | PrintAndLog(" data - data to write (hex)"); | |
761 | PrintAndLog(" pwd - password (hex) (optional)"); | |
762 | PrintAndLog("samples:"); | |
763 | PrintAndLog(" lf em 4x05writeword 1"); | |
764 | PrintAndLog(" lf em 4x05writeword 1 deadc0de 11223344"); | |
765 | return 0; | |
766 | } | |
767 | ||
768 | int CmdEM4x05WriteWord(const char *Cmd) { | |
769 | uint8_t ctmp = param_getchar(Cmd, 0); | |
770 | if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_write(); | |
771 | ||
772 | bool usePwd = false; | |
773 | ||
774 | uint8_t addr = 16; // default to invalid address | |
775 | uint32_t data = 0xFFFFFFFF; // default to blank data | |
776 | uint32_t pwd = 0xFFFFFFFF; // default to blank password | |
777 | ||
778 | addr = param_get8ex(Cmd, 0, 16, 10); | |
779 | data = param_get32ex(Cmd, 1, 0, 16); | |
780 | pwd = param_get32ex(Cmd, 2, 1, 16); | |
781 | ||
782 | ||
783 | if ( (addr > 15) ) { | |
784 | PrintAndLog("Address must be between 0 and 15"); | |
785 | return 1; | |
786 | } | |
787 | if ( pwd == 1 ) | |
788 | PrintAndLog("Writing address %d data %08X", addr, data); | |
789 | else { | |
790 | usePwd = true; | |
791 | PrintAndLog("Writing address %d data %08X using password %08X", addr, data, pwd); | |
792 | } | |
793 | ||
794 | uint16_t flag = (addr << 8 ) | usePwd; | |
795 | ||
796 | UsbCommand c = {CMD_EM4X_WRITE_WORD, {flag, data, pwd}}; | |
797 | clearCommandBuffer(); | |
798 | SendCommand(&c); | |
799 | UsbCommand resp; | |
800 | if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)){ | |
801 | PrintAndLog("Error occurred, device did not respond during write operation."); | |
802 | return -1; | |
803 | } | |
804 | //get response if there is one | |
805 | uint8_t got[6000]; // 8 bit preamble + 32 bit word response (max clock (128) * 40bits = 5120 samples) | |
806 | GetFromBigBuf(got, sizeof(got), 0); | |
807 | if ( !WaitForResponseTimeout(CMD_ACK, NULL, 4000) ) { | |
808 | PrintAndLog("command execution time out"); | |
809 | return 0; | |
810 | } | |
811 | setGraphBuf(got, sizeof(got)); | |
812 | //check response for 00001010 for write confirmation! | |
813 | //attempt demod: | |
814 | uint32_t dummy = 0; | |
815 | int result = demodEM4x05resp(&dummy,false); | |
816 | if (result == 1) { | |
817 | PrintAndLog("Write Verified"); | |
818 | } | |
819 | return result; | |
820 | } | |
821 | ||
822 | static command_t CommandTable[] = | |
823 | { | |
824 | {"help", CmdHelp, 1, "This help"}, | |
825 | {"410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"}, | |
826 | {"410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag in GraphBuffer"}, | |
827 | {"410xsim", CmdEM410xSim, 0, "<UID> [clock rate] -- Simulate EM410x tag"}, | |
828 | {"410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"}, | |
829 | {"410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" }, | |
830 | {"410xwrite", CmdEM410xWrite, 0, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"}, | |
831 | {"4x05dump", CmdEM4x05dump, 1, "(pwd) -- Read EM4x05/EM4x69 all word data"}, | |
832 | {"4x05readword", CmdEM4x05ReadWord, 1, "<Word> (pwd) -- Read EM4x05/EM4x69 word data"}, | |
833 | {"4x05writeword", CmdEM4x05WriteWord, 1, "<Word> <data> (pwd) -- Write EM4x05/EM4x69 word data"}, | |
834 | {"4x50read", CmdEM4x50Read, 1, "demod data from EM4x50 tag from the graph buffer"}, | |
835 | {NULL, NULL, 0, NULL} | |
836 | }; | |
837 | ||
838 | int CmdLFEM4X(const char *Cmd) | |
839 | { | |
840 | CmdsParse(CommandTable, Cmd); | |
841 | return 0; | |
842 | } | |
843 | ||
844 | int CmdHelp(const char *Cmd) | |
845 | { | |
846 | CmdsHelp(CommandTable); | |
847 | return 0; | |
848 | } |