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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 "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 | } |