]> git.zerfleddert.de Git - proxmark3-svn/blame - client/cmdlfem4x.c
syntax sugar
[proxmark3-svn] / client / cmdlfem4x.c
CommitLineData
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
4ac9f078 254
255//////////////// 4050 / 4450 commands
256int usage_lf_em4x50_dump(void) {
257 PrintAndLog("Dump EM4x50/EM4x69. Tag must be on antenna. ");
258 PrintAndLog("");
259 PrintAndLog("Usage: lf em 4x50dump [h] <pwd>");
260 PrintAndLog("Options:");
261 PrintAndLog(" h - this help");
262 PrintAndLog(" pwd - password (hex) (optional)");
263 PrintAndLog("samples:");
264 PrintAndLog(" lf em 4x50dump");
265 PrintAndLog(" lf em 4x50dump 11223344");
266 return 0;
267}
268int usage_lf_em4x50_read(void) {
269 PrintAndLog("Read EM 4x50/EM4x69. Tag must be on antenna. ");
270 PrintAndLog("");
271 PrintAndLog("Usage: lf em 4x50read [h] <address> <pwd>");
272 PrintAndLog("Options:");
273 PrintAndLog(" h - this help");
274 PrintAndLog(" address - memory address to read. (0-15)");
275 PrintAndLog(" pwd - password (hex) (optional)");
276 PrintAndLog("samples:");
277 PrintAndLog(" lf em 4x50read 1");
278 PrintAndLog(" lf em 4x50read 1 11223344");
279 return 0;
280}
281int usage_lf_em4x50_write(void) {
282 PrintAndLog("Write EM 4x50/4x69. Tag must be on antenna. ");
283 PrintAndLog("");
284 PrintAndLog("Usage: lf em 4x50write [h] <address> <data> <pwd>");
285 PrintAndLog("Options:");
286 PrintAndLog(" h - this help");
287 PrintAndLog(" address - memory address to write to. (0-15)");
288 PrintAndLog(" data - data to write (hex)");
289 PrintAndLog(" pwd - password (hex) (optional)");
290 PrintAndLog("samples:");
291 PrintAndLog(" lf em 4x50write 1 deadc0de");
292 PrintAndLog(" lf em 4x50write 1 deadc0de 11223344");
293 return 0;
294}
295
23f0a7d8 296uint32_t OutputEM4x50_Block(uint8_t *BitStream, size_t size, bool verbose, bool pTest)
297{
298 if (size<45) return 0;
cb1ba30a 299
23f0a7d8 300 uint32_t code = bytebits_to_byte(BitStream,8);
301 code = code<<8 | bytebits_to_byte(BitStream+9,8);
302 code = code<<8 | bytebits_to_byte(BitStream+18,8);
303 code = code<<8 | bytebits_to_byte(BitStream+27,8);
cb1ba30a 304
23f0a7d8 305 if (verbose || g_debugMode){
306 for (uint8_t i = 0; i<5; i++){
cc15a118 307 if (i == 4) PrintAndLog(""); //parity byte spacer
23f0a7d8 308 PrintAndLog("%d%d%d%d%d%d%d%d %d -> 0x%02x",
309 BitStream[i*9],
310 BitStream[i*9+1],
311 BitStream[i*9+2],
312 BitStream[i*9+3],
313 BitStream[i*9+4],
314 BitStream[i*9+5],
315 BitStream[i*9+6],
316 BitStream[i*9+7],
317 BitStream[i*9+8],
318 bytebits_to_byte(BitStream+i*9,8)
319 );
320 }
321 if (pTest)
322 PrintAndLog("Parity Passed");
323 else
324 PrintAndLog("Parity Failed");
325 }
23f0a7d8 326 return code;
327}
4ac9f078 328
329
ff9c043d 330/* Read the transmitted data of an EM4x50 tag from the graphbuffer
7fe9b0b7 331 * Format:
332 *
333 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
334 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
335 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
336 * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
337 * CCCCCCCC <- column parity bits
338 * 0 <- stop bit
339 * LW <- Listen Window
340 *
341 * This pattern repeats for every block of data being transmitted.
342 * Transmission starts with two Listen Windows (LW - a modulated
343 * pattern of 320 cycles each (32/32/128/64/64)).
344 *
345 * Note that this data may or may not be the UID. It is whatever data
346 * is stored in the blocks defined in the control word First and Last
347 * Word Read values. UID is stored in block 32.
348 */
cc15a118 349 //completed by Marshmellow
4ac9f078 350int EM4x50Read(const char *Cmd, bool verbose) {
cc15a118 351 uint8_t fndClk[] = {8,16,32,40,50,64,128};
23f0a7d8 352 int clk = 0;
353 int invert = 0;
23f0a7d8 354 int tol = 0;
355 int i, j, startblock, skip, block, start, end, low, high, minClk;
cc15a118 356 bool complete = false;
23f0a7d8 357 int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
23f0a7d8 358 uint32_t Code[6];
359 char tmp[6];
23f0a7d8 360 char tmp2[20];
49bbc60a 361 int phaseoff;
cc15a118 362 high = low = 0;
23f0a7d8 363 memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
cc15a118 364
365 // get user entry if any
366 sscanf(Cmd, "%i %i", &clk, &invert);
367
368 // save GraphBuffer - to restore it later
369 save_restoreGB(1);
370
23f0a7d8 371 // first get high and low values
cc15a118 372 for (i = 0; i < GraphTraceLen; i++) {
23f0a7d8 373 if (GraphBuffer[i] > high)
374 high = GraphBuffer[i];
375 else if (GraphBuffer[i] < low)
376 low = GraphBuffer[i];
377 }
378
cc15a118 379 i = 0;
380 j = 0;
381 minClk = 255;
382 // get to first full low to prime loop and skip incomplete first pulse
383 while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
384 ++i;
385 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
386 ++i;
387 skip = i;
388
389 // populate tmpbuff buffer with pulse lengths
390 while (i < GraphTraceLen) {
23f0a7d8 391 // measure from low to low
cc15a118 392 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
23f0a7d8 393 ++i;
394 start= i;
cc15a118 395 while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
23f0a7d8 396 ++i;
cc15a118 397 while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
23f0a7d8 398 ++i;
399 if (j>=(MAX_GRAPH_TRACE_LEN/64)) {
400 break;
401 }
402 tmpbuff[j++]= i - start;
cc15a118 403 if (i-start < minClk && i < GraphTraceLen) {
404 minClk = i - start;
405 }
23f0a7d8 406 }
407 // set clock
cc15a118 408 if (!clk) {
23f0a7d8 409 for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
410 tol = fndClk[clkCnt]/8;
cc15a118 411 if (minClk >= fndClk[clkCnt]-tol && minClk <= fndClk[clkCnt]+1) {
23f0a7d8 412 clk=fndClk[clkCnt];
413 break;
414 }
415 }
cb1ba30a 416 if (!clk) {
417 PrintAndLog("ERROR: EM4x50 - didn't find a clock");
418 return 0;
419 }
6e984446 420 } else tol = clk/8;
23f0a7d8 421
422 // look for data start - should be 2 pairs of LW (pulses of clk*3,clk*2)
cc15a118 423 start = -1;
424 for (i= 0; i < j - 4 ; ++i) {
23f0a7d8 425 skip += tmpbuff[i];
cc15a118 426 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
427 if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
428 if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
429 if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
23f0a7d8 430 {
431 start= i + 4;
432 break;
433 }
434 }
cc15a118 435 startblock = i + 4;
23f0a7d8 436
437 // skip over the remainder of LW
49bbc60a 438 skip += tmpbuff[i+1] + tmpbuff[i+2] + clk;
439 if (tmpbuff[i+3]>clk)
440 phaseoff = tmpbuff[i+3]-clk;
441 else
442 phaseoff = 0;
23f0a7d8 443 // now do it again to find the end
444 end = skip;
cc15a118 445 for (i += 3; i < j - 4 ; ++i) {
23f0a7d8 446 end += tmpbuff[i];
cc15a118 447 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
448 if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
449 if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
450 if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
23f0a7d8 451 {
452 complete= true;
453 break;
454 }
455 }
456 end = i;
457 // report back
458 if (verbose || g_debugMode) {
459 if (start >= 0) {
cc15a118 460 PrintAndLog("\nNote: one block = 50 bits (32 data, 12 parity, 6 marker)");
23f0a7d8 461 } else {
cc15a118 462 PrintAndLog("No data found!, clock tried:%d",clk);
23f0a7d8 463 PrintAndLog("Try again with more samples.");
cc15a118 464 PrintAndLog(" or after a 'data askedge' command to clean up the read");
23f0a7d8 465 return 0;
466 }
23f0a7d8 467 } else if (start < 0) return 0;
cc15a118 468 start = skip;
23f0a7d8 469 snprintf(tmp2, sizeof(tmp2),"%d %d 1000 %d", clk, invert, clk*47);
470 // get rid of leading crap
cc15a118 471 snprintf(tmp, sizeof(tmp), "%i", skip);
23f0a7d8 472 CmdLtrim(tmp);
473 bool pTest;
cc15a118 474 bool AllPTest = true;
23f0a7d8 475 // now work through remaining buffer printing out data blocks
476 block = 0;
477 i = startblock;
cc15a118 478 while (block < 6) {
23f0a7d8 479 if (verbose || g_debugMode) PrintAndLog("\nBlock %i:", block);
480 skip = phaseoff;
481
482 // look for LW before start of next block
cc15a118 483 for ( ; i < j - 4 ; ++i) {
23f0a7d8 484 skip += tmpbuff[i];
485 if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol)
486 if (tmpbuff[i+1] >= clk-tol)
487 break;
488 }
49bbc60a 489 if (i >= j-4) break; //next LW not found
23f0a7d8 490 skip += clk;
49bbc60a 491 if (tmpbuff[i+1]>clk)
492 phaseoff = tmpbuff[i+1]-clk;
493 else
494 phaseoff = 0;
23f0a7d8 495 i += 2;
fef74fdc 496 if (ASKDemod(tmp2, false, false, 1) < 1) {
cc15a118 497 save_restoreGB(0);
498 return 0;
499 }
23f0a7d8 500 //set DemodBufferLen to just one block
501 DemodBufferLen = skip/clk;
502 //test parities
503 pTest = EM_ByteParityTest(DemodBuffer,DemodBufferLen,5,9,0);
504 pTest &= EM_EndParityTest(DemodBuffer,DemodBufferLen,5,9,0);
505 AllPTest &= pTest;
506 //get output
cc15a118 507 Code[block] = OutputEM4x50_Block(DemodBuffer,DemodBufferLen,verbose, pTest);
508 if (g_debugMode) PrintAndLog("\nskipping %d samples, bits:%d", skip, skip/clk);
23f0a7d8 509 //skip to start of next block
510 snprintf(tmp,sizeof(tmp),"%i",skip);
511 CmdLtrim(tmp);
512 block++;
cc15a118 513 if (i >= end) break; //in case chip doesn't output 6 blocks
23f0a7d8 514 }
515 //print full code:
516 if (verbose || g_debugMode || AllPTest){
49bbc60a 517 if (!complete) {
518 PrintAndLog("*** Warning!");
519 PrintAndLog("Partial data - no end found!");
520 PrintAndLog("Try again with more samples.");
521 }
cc15a118 522 PrintAndLog("Found data at sample: %i - using clock: %i", start, clk);
523 end = block;
524 for (block=0; block < end; block++){
23f0a7d8 525 PrintAndLog("Block %d: %08x",block,Code[block]);
526 }
49bbc60a 527 if (AllPTest) {
23f0a7d8 528 PrintAndLog("Parities Passed");
49bbc60a 529 } else {
23f0a7d8 530 PrintAndLog("Parities Failed");
cc15a118 531 PrintAndLog("Try cleaning the read samples with 'data askedge'");
49bbc60a 532 }
23f0a7d8 533 }
534
535 //restore GraphBuffer
536 save_restoreGB(0);
537 return (int)AllPTest;
538}
539
cb1ba30a 540int CmdEM4x50Read(const char *Cmd) {
4ac9f078 541 uint8_t ctmp = param_getchar(Cmd, 0);
542 if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x50_read();
23f0a7d8 543 return EM4x50Read(Cmd, true);
2d4eae76 544}
545
4ac9f078 546int CmdEM4x50Write(const char *Cmd){
547 uint8_t ctmp = param_getchar(Cmd, 0);
548 if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x50_write();
549 PrintAndLog("no implemented yet");
23f0a7d8 550 return 0;
54a942b0 551}
4ac9f078 552int CmdEM4x50Dump(const char *Cmd){
553 uint8_t ctmp = param_getchar(Cmd, 0);
554 if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x50_dump();
555 PrintAndLog("no implemented yet");
516dbac2 556 return 0;
557}
558
559#define EM_PREAMBLE_LEN 6
560// download samples from device
561// and copy them to Graphbuffer
562bool downloadSamplesEM(){
563
564 // 8 bit preamble + 32 bit word response (max clock (128) * 40bits = 5120 samples)
565 uint8_t got[6000];
566 GetFromBigBuf(got, sizeof(got), 0);
567 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) {
568 PrintAndLog("command execution time out");
569 return FALSE;
570 }
571 setGraphBuf(got, sizeof(got));
572 return TRUE;
573}
f9f5f450 574//search for given preamble in given BitStream and return success=1 or fail=0 and startIndex
516dbac2 575bool doPreambleSearch(size_t *startIdx){
576
577 // sanity check
6f931855 578 if ( DemodBufferLen < EM_PREAMBLE_LEN) {
579 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 demodbuffer too small");
516dbac2 580 return FALSE;
6f931855 581 }
516dbac2 582
583 // skip first two 0 bits as they might have been missed in the demod
584 uint8_t preamble[EM_PREAMBLE_LEN] = {0,0,1,0,1,0};
585
4ac9f078 586 // set size to 15 to only test first 4 positions for the preamble
587 size_t size = (15 > DemodBufferLen) ? DemodBufferLen : 15;
516dbac2 588 *startIdx = 0;
589 uint8_t found = 0;
bd09006a 590
f9f5f450 591 // em only sends preamble once, so look for it once in the first x bits
516dbac2 592 for (int idx = 0; idx < size - EM_PREAMBLE_LEN; idx++){
593 if (memcmp(DemodBuffer+idx, preamble, EM_PREAMBLE_LEN) == 0){
f9f5f450 594 //first index found
516dbac2 595 *startIdx = idx;
596 found = 1;
597 break;
f9f5f450 598 }
599 }
516dbac2 600
601 if ( !found) {
602 if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", *startIdx);
603 return FALSE;
604 }
516dbac2 605 return TRUE;
f9f5f450 606}
607
bd09006a 608bool detectFSK(){
609 // detect fsk clock
610 if (!GetFskClock("", FALSE, FALSE)) {
4ac9f078 611 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: FSK clock failed");
bd09006a 612 return FALSE;
f9f5f450 613 }
bd09006a 614 // demod
615 int ans = FSKrawDemod("0 0", FALSE);
616 if (!ans) {
4ac9f078 617 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: FSK Demod failed");
bd09006a 618 return FALSE;
62dc7d4a 619 }
bd09006a 620 return TRUE;
621}
622// PSK clocks should be easy to detect ( but difficult to demod a non-repeating pattern... )
623bool detectPSK(){
624 int ans = GetPskClock("", FALSE, FALSE);
6f931855 625 if (ans <= 0) {
4ac9f078 626 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: PSK clock failed");
bd09006a 627 return FALSE;
628 }
4ac9f078 629 //demod
630 //try psk1 -- 0 0 6 (six errors?!?)
631 ans = PSKDemod("0 0 6", FALSE);
632 if (!ans) {
633 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: PSK1 Demod failed");
634
635 //try psk1 inverted
636 ans = PSKDemod("0 1 6", FALSE);
637 if (!ans) {
638 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: PSK1 inverted Demod failed");
639 return FALSE;
640 }
641 }
642 // either PSK1 or PSK1 inverted is ok from here.
643 // lets check PSK2 later.
bd09006a 644 return TRUE;
645}
646// try manchester - NOTE: ST only applies to T55x7 tags.
647bool detectASK_MAN(){
648 bool stcheck = FALSE;
6f931855 649 int ans = ASKDemod_ext("0 0 0", FALSE, FALSE, 1, &stcheck);
bd09006a 650 if (!ans) {
4ac9f078 651 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: ASK/Manchester Demod failed");
bd09006a 652 return FALSE;
653 }
654 return TRUE;
655}
656bool detectASK_BI(){
657 int ans = ASKbiphaseDemod("0 0 1", FALSE);
658 if (!ans) {
4ac9f078 659 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: ASK/biphase normal demod failed");
bd09006a 660
661 ans = ASKbiphaseDemod("0 1 1", FALSE);
62dc7d4a 662 if (!ans) {
4ac9f078 663 if (g_debugMode) PrintAndLog("DEBUG: Error - EM: ASK/biphase inverted demod failed");
bd09006a 664 return FALSE;
62dc7d4a 665 }
666 }
bd09006a 667 return TRUE;
668}
f9f5f450 669
516dbac2 670// param: idx - start index in demoded data.
4ac9f078 671bool setDemodBufferEM(uint32_t *word, size_t idx){
672
673 //test for even parity bits.
674 size_t size = removeParity(DemodBuffer, idx + EM_PREAMBLE_LEN, 9, 0, 44);
675 if (!size) {
676 if (g_debugMode) PrintAndLog("DEBUG: Error -EM Parity not detected");
677 return FALSE;
516dbac2 678 }
4ac9f078 679
680 //todo test last 8 bits for even parity || (xor)
681 setDemodBuf(DemodBuffer, 40, 0);
682
683 *word = bytebits_to_byteLSBF(DemodBuffer, 32);
684
685 uint8_t lo = (uint8_t) bytebits_to_byteLSBF(DemodBuffer , 8);
686 uint8_t lo2 = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 8, 8);
687 uint8_t hi = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 16, 8);
688 uint8_t hi2 = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 24, 8);
689 uint8_t cs = (uint8_t) bytebits_to_byteLSBF(DemodBuffer + 32, 8);
690 uint8_t cs2 = lo ^ lo2 ^ hi ^ hi2;
691 if (g_debugMode) PrintAndLog("EM4x05/4x69 : %08X CS: %02X %s"
692 , *word
693 , cs
694 , (cs2==cs) ? "Passed" : "Failed"
695 );
696
697 return (cs2==cs);
bd09006a 698}
f9f5f450 699
bd09006a 700// FSK, PSK, ASK/MANCHESTER, ASK/BIPHASE, ASK/DIPHASE
701// should cover 90% of known used configs
702// the rest will need to be manually demoded for now...
4ac9f078 703bool demodEM4x05resp(uint32_t *word) {
704 size_t idx = 0;
705
706 if (detectASK_MAN() && doPreambleSearch( &idx ))
707 return setDemodBufferEM(word, idx);
bd09006a 708
4ac9f078 709 if (detectASK_BI() && doPreambleSearch( &idx ))
710 return setDemodBufferEM(word, idx);
bd09006a 711
4ac9f078 712 if (detectFSK() && doPreambleSearch( &idx ))
713 return setDemodBufferEM(word, idx);
bd09006a 714
4ac9f078 715 if (detectPSK()) {
716 if (doPreambleSearch( &idx ))
717 return setDemodBufferEM(word, idx);
718
719 psk1TOpsk2(DemodBuffer, DemodBufferLen);
720 if (doPreambleSearch( &idx ))
721 return setDemodBufferEM(word, idx);
722 }
723 return FALSE;
724}
725
726//////////////// 4205 / 4305 commands
727int usage_lf_em4x05_dump(void) {
728 PrintAndLog("Dump EM4x05/EM4x69. Tag must be on antenna. ");
729 PrintAndLog("");
730 PrintAndLog("Usage: lf em 4x05dump [h] <pwd>");
731 PrintAndLog("Options:");
732 PrintAndLog(" h - this help");
733 PrintAndLog(" pwd - password (hex) (optional)");
734 PrintAndLog("samples:");
735 PrintAndLog(" lf em 4x05dump");
736 PrintAndLog(" lf em 4x05dump 11223344");
737 return 0;
738}
739int usage_lf_em4x05_read(void) {
740 PrintAndLog("Read EM4x05/EM4x69. Tag must be on antenna. ");
741 PrintAndLog("");
742 PrintAndLog("Usage: lf em 4x05read [h] <address> <pwd>");
743 PrintAndLog("Options:");
744 PrintAndLog(" h - this help");
745 PrintAndLog(" address - memory address to read. (0-15)");
746 PrintAndLog(" pwd - password (hex) (optional)");
747 PrintAndLog("samples:");
748 PrintAndLog(" lf em 4x05read 1");
749 PrintAndLog(" lf em 4x05read 1 11223344");
750 return 0;
751}
752int usage_lf_em4x05_write(void) {
753 PrintAndLog("Write EM4x05/4x69. Tag must be on antenna. ");
754 PrintAndLog("");
755 PrintAndLog("Usage: lf em 4x05write [h] <address> <data> <pwd>");
756 PrintAndLog("Options:");
757 PrintAndLog(" h - this help");
758 PrintAndLog(" address - memory address to write to. (0-15)");
759 PrintAndLog(" data - data to write (hex)");
760 PrintAndLog(" pwd - password (hex) (optional)");
761 PrintAndLog("samples:");
762 PrintAndLog(" lf em 4x05write 1 deadc0de");
763 PrintAndLog(" lf em 4x05write 1 deadc0de 11223344");
764 return 0;
765}
766
767int CmdEM4x05Dump(const char *Cmd) {
768 uint8_t addr = 0;
769 uint32_t pwd;
770 bool usePwd = false;
771 uint8_t ctmp = param_getchar(Cmd, 0);
772 if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x05_dump();
773
774 // for now use default input of 1 as invalid (unlikely 1 will be a valid password...)
775 pwd = param_get32ex(Cmd, 0, 1, 16);
bd09006a 776
5e9d59fe 777 if ( pwd != 1 )
4ac9f078 778 usePwd = true;
5e9d59fe 779
4ac9f078 780 int success = 1;
781 for (; addr < 16; addr++) {
782 if (addr == 2) {
783 if (usePwd) {
5e9d59fe 784 PrintAndLog("PWD Address %02u | %08X", addr, pwd);
4ac9f078 785 } else {
786 PrintAndLog("PWD Address 02 | cannot read");
787 }
788 } else {
789 //success &= EM4x05Read(addr, pwd, usePwd);
790 }
791 }
080e1114 792
4ac9f078 793 return success;
f9f5f450 794}
5e9d59fe 795//ICEMAN; mentalnote to self: -1 is not doable for uint32_t..
4ac9f078 796int CmdEM4x05Read(const char *Cmd) {
cb1ba30a 797 int addr, pwd;
798 bool usePwd = false;
799 uint8_t ctmp = param_getchar(Cmd, 0);
4ac9f078 800 if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x05_read();
cb1ba30a 801
802 addr = param_get8ex(Cmd, 0, -1, 10);
803 pwd = param_get32ex(Cmd, 1, -1, 16);
23f0a7d8 804
cb1ba30a 805 if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) {
806 PrintAndLog("Address must be between 0 and 15");
23f0a7d8 807 return 1;
808 }
cb1ba30a 809 if ( pwd == -1 )
810 PrintAndLog("Reading address %d", addr);
811 else {
812 usePwd = true;
813 PrintAndLog("Reading address %d | password %08X", addr, pwd);
814 }
23f0a7d8 815
cb1ba30a 816 UsbCommand c = {CMD_EM4X_READ_WORD, {addr, pwd, usePwd}};
817 clearCommandBuffer();
23f0a7d8 818 SendCommand(&c);
cb1ba30a 819 UsbCommand resp;
820 if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)){
821 PrintAndLog("Command timed out");
822 return -1;
23f0a7d8 823 }
516dbac2 824
825 if (!downloadSamplesEM())
ff9c043d 826 return -1;
516dbac2 827
f9f5f450 828 int testLen = (GraphTraceLen < 1000) ? GraphTraceLen : 1000;
829 if (graphJustNoise(GraphBuffer, testLen)) {
516dbac2 830 PrintAndLog("Tag not found");
ff9c043d 831 return -1;
832 }
833
4ac9f078 834 //attempt demod
835 uint32_t word = 0;
836 int isOk = demodEM4x05resp(&word);
837 if (isOk)
838 PrintAndLog("Got Address %02d | %08X",addr, word);
839 else
080e1114 840 PrintAndLog("Read failed");
841
4ac9f078 842 return isOk;
54a942b0 843}
844
4ac9f078 845int CmdEM4x05Write(const char *Cmd) {
cb1ba30a 846 uint8_t ctmp = param_getchar(Cmd, 0);
4ac9f078 847 if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x05_write();
cb1ba30a 848
516dbac2 849 bool usePwd = false;
cb1ba30a 850 int addr = 16; // default to invalid address
851 int data = 0xFFFFFFFF; // default to blank data
852 int pwd = 0xFFFFFFFF; // default to blank password
853
854 addr = param_get8ex(Cmd, 0, -1, 10);
855 data = param_get32ex(Cmd, 1, -1, 16);
856 pwd = param_get32ex(Cmd, 2, -1, 16);
23f0a7d8 857
cb1ba30a 858 if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) {
859 PrintAndLog("Address must be between 0 and 15");
23f0a7d8 860 return 1;
861 }
cb1ba30a 862 if ( pwd == -1 )
863 PrintAndLog("Writing address %d data %08X", addr, data);
864 else {
865 usePwd = true;
866 PrintAndLog("Writing address %d data %08X using password %08X", addr, data, pwd);
867 }
23f0a7d8 868
cb1ba30a 869 uint16_t flag = (addr << 8 ) | usePwd;
23f0a7d8 870
cb1ba30a 871 UsbCommand c = {CMD_EM4X_WRITE_WORD, {flag, data, pwd}};
872 clearCommandBuffer();
23f0a7d8 873 SendCommand(&c);
cb1ba30a 874 UsbCommand resp;
4ac9f078 875 if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)){
cb1ba30a 876 PrintAndLog("Error occurred, device did not respond during write operation.");
877 return -1;
878 }
ff9c043d 879
516dbac2 880 if (!downloadSamplesEM())
881 return -1;
882
62dc7d4a 883 //todo: check response for 00001010 then write data for write confirmation!
ff9c043d 884
62dc7d4a 885 //attempt demod:
886 //need 0 bits demoded (after preamble) to verify write cmd
4ac9f078 887 uint32_t dummy = 0;
888 int isOk = demodEM4x05resp(&dummy);
889 if (isOk)
62dc7d4a 890 PrintAndLog("Write Verified");
516dbac2 891
4ac9f078 892 return isOk;
54a942b0 893}
894
cb1ba30a 895static command_t CommandTable[] = {
896 {"help", CmdHelp, 1, "This help"},
4ac9f078 897 {"410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"},
898 {"410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag in GraphBuffer"},
899 {"410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
900 {"410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
901 {"410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" },
902 {"410xwrite", CmdEM410xWrite, 0, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
903 {"4x05read", CmdEM4x05Read, 0, "read word data from EM4205/4305"},
904 {"4x05write", CmdEM4x05Write, 0, "write word data to EM4205/4305"},
905 {"4x05dump", CmdEM4x05Dump, 0, "dump EM4205/4305 tag"},
906 {"4x50read", CmdEM4x50Read, 0, "read word data from EM4x50"},
907 {"4x50write", CmdEM4x50Write, 0, "write word data to EM4x50"},
908 {"4x50dump", CmdEM4x50Dump, 0, "dump EM4x50 tag"},
23f0a7d8 909 {NULL, NULL, 0, NULL}
7fe9b0b7 910};
911
4c36581b 912int CmdLFEM4X(const char *Cmd) {
913 clearCommandBuffer();
23f0a7d8 914 CmdsParse(CommandTable, Cmd);
915 return 0;
7fe9b0b7 916}
917
4c36581b 918int CmdHelp(const char *Cmd) {
23f0a7d8 919 CmdsHelp(CommandTable);
920 return 0;
7fe9b0b7 921}
Impressum, Datenschutz