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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 | 13 | uint64_t g_em410xid = 0; |
7fe9b0b7 | 14 | |
15 | static int CmdHelp(const char *Cmd); | |
16 | ||
66707a3b | 17 | int 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 | */ | |
34 | int 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 | |
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 | ||
13d77ef9 | 65 | // emulate an EM410X tag |
7fe9b0b7 | 66 | int 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 | 141 | int 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 | 158 | int 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 | 167 | int 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 | 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; | |
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 | ||
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; | |
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 | 306 | int 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 | 498 | int CmdEM4x50Read(const char *Cmd) { |
23f0a7d8 | 499 | return EM4x50Read(Cmd, true); |
2d4eae76 | 500 | } |
501 | ||
cb1ba30a | 502 | int 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 | |
bd09006a | 517 | uint8_t EMpreambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t size, size_t *startIdx) { |
f9f5f450 | 518 | // Sanity check. If preamble length is bigger than bitstream length. |
519 | if ( size <= pLen ) return 0; | |
bd09006a | 520 | |
f9f5f450 | 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 | ||
bd09006a | 536 | #define EM_PREAMBLE_LEN 6 |
537 | bool detectFSK(){ | |
538 | // detect fsk clock | |
539 | if (!GetFskClock("", FALSE, FALSE)) { | |
540 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: FSK clock failed"); | |
541 | return FALSE; | |
f9f5f450 | 542 | } |
bd09006a | 543 | // demod |
544 | int ans = FSKrawDemod("0 0", FALSE); | |
545 | if (!ans) { | |
546 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: FSK Demod failed"); | |
547 | return FALSE; | |
62dc7d4a | 548 | } |
bd09006a | 549 | return TRUE; |
550 | } | |
551 | // PSK clocks should be easy to detect ( but difficult to demod a non-repeating pattern... ) | |
552 | bool detectPSK(){ | |
553 | int ans = GetPskClock("", FALSE, FALSE); | |
554 | if (!ans) { | |
555 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: PSK clock failed"); | |
556 | return FALSE; | |
557 | } | |
558 | PrintAndLog("PSK response possibly found, run `data rawd p1` to attempt to demod"); | |
559 | return TRUE; | |
560 | } | |
561 | // try manchester - NOTE: ST only applies to T55x7 tags. | |
562 | bool detectASK_MAN(){ | |
563 | bool stcheck = FALSE; | |
564 | int ans = ASKDemod_ext("0 0 0", TRUE, FALSE, 1, &stcheck); | |
565 | if (!ans) { | |
566 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed"); | |
567 | return FALSE; | |
568 | } | |
569 | return TRUE; | |
570 | } | |
571 | bool detectASK_BI(){ | |
572 | int ans = ASKbiphaseDemod("0 0 1", FALSE); | |
573 | if (!ans) { | |
574 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase normal demod failed"); | |
575 | ||
576 | ans = ASKbiphaseDemod("0 1 1", FALSE); | |
62dc7d4a | 577 | if (!ans) { |
bd09006a | 578 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase inverted demod failed"); |
579 | return FALSE; | |
62dc7d4a | 580 | } |
581 | } | |
bd09006a | 582 | return TRUE; |
583 | } | |
584 | bool doPreambleSearch(size_t *startIdx){ | |
f9f5f450 | 585 | |
bd09006a | 586 | // skip first two 0 bits as they might have been missed in the demod |
587 | uint8_t preamble[EM_PREAMBLE_LEN] = {0,0,1,0,1,0}; | |
588 | ||
589 | // set size to 10 to only test first 4 positions for the preamble | |
590 | size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10; | |
591 | *startIdx = 0; | |
592 | ||
593 | if (g_debugMode) PrintAndLog("Before:: startindex: %u | size: %u", *startIdx, size); | |
594 | ||
595 | uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, EM_PREAMBLE_LEN, size, startIdx); | |
596 | if ( errChk == 0) { | |
597 | if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", *startIdx); | |
598 | return FALSE; | |
599 | } | |
600 | if (g_debugMode) PrintAndLog("After:: startindex: %u | size: %u", *startIdx, size); | |
601 | return TRUE; | |
602 | } | |
f9f5f450 | 603 | |
bd09006a | 604 | // FSK, PSK, ASK/MANCHESTER, ASK/BIPHASE, ASK/DIPHASE |
605 | // should cover 90% of known used configs | |
606 | // the rest will need to be manually demoded for now... | |
607 | int demodEM4x05resp(uint8_t bitsNeeded) { | |
f9f5f450 | 608 | |
bd09006a | 609 | size_t startIdx = 0; |
610 | ||
611 | if (detectASK_MAN() && doPreambleSearch( &startIdx )) | |
612 | goto EXIT_SET; | |
613 | ||
614 | if (detectASK_BI() && doPreambleSearch( &startIdx )) | |
615 | goto EXIT_SET; | |
616 | ||
617 | if (detectFSK() && doPreambleSearch( &startIdx )) | |
618 | goto EXIT_SET; | |
619 | ||
620 | ||
621 | if (detectPSK() && doPreambleSearch( &startIdx )) | |
622 | goto EXIT_SET; | |
623 | ||
624 | return -1; | |
625 | ||
626 | EXIT_SET: | |
627 | if ( bitsNeeded < DemodBufferLen) { | |
628 | setDemodBuf(DemodBuffer + startIdx + EM_PREAMBLE_LEN, bitsNeeded, 0); | |
f9f5f450 | 629 | CmdPrintDemodBuff("x"); |
630 | return 1; | |
631 | } | |
632 | return -1; | |
633 | } | |
634 | ||
cb1ba30a | 635 | int CmdReadWord(const char *Cmd) { |
636 | int addr, pwd; | |
637 | bool usePwd = false; | |
638 | uint8_t ctmp = param_getchar(Cmd, 0); | |
639 | if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_read(); | |
640 | ||
641 | addr = param_get8ex(Cmd, 0, -1, 10); | |
642 | pwd = param_get32ex(Cmd, 1, -1, 16); | |
23f0a7d8 | 643 | |
cb1ba30a | 644 | if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) { |
645 | PrintAndLog("Address must be between 0 and 15"); | |
23f0a7d8 | 646 | return 1; |
647 | } | |
cb1ba30a | 648 | if ( pwd == -1 ) |
649 | PrintAndLog("Reading address %d", addr); | |
650 | else { | |
651 | usePwd = true; | |
652 | PrintAndLog("Reading address %d | password %08X", addr, pwd); | |
653 | } | |
23f0a7d8 | 654 | |
cb1ba30a | 655 | UsbCommand c = {CMD_EM4X_READ_WORD, {addr, pwd, usePwd}}; |
656 | clearCommandBuffer(); | |
23f0a7d8 | 657 | SendCommand(&c); |
cb1ba30a | 658 | UsbCommand resp; |
659 | if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)){ | |
660 | PrintAndLog("Command timed out"); | |
661 | return -1; | |
23f0a7d8 | 662 | } |
663 | ||
ff9c043d | 664 | uint8_t got[6000]; |
cb1ba30a | 665 | GetFromBigBuf(got, sizeof(got), 0); |
ff9c043d | 666 | if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) { |
cb1ba30a | 667 | PrintAndLog("command execution time out"); |
ff9c043d | 668 | return -1; |
cb1ba30a | 669 | } |
670 | setGraphBuf(got, sizeof(got)); | |
f9f5f450 | 671 | int testLen = (GraphTraceLen < 1000) ? GraphTraceLen : 1000; |
672 | if (graphJustNoise(GraphBuffer, testLen)) { | |
673 | PrintAndLog("no tag not found"); | |
ff9c043d | 674 | return -1; |
675 | } | |
676 | ||
62dc7d4a | 677 | //attempt demod: |
678 | //need 32 bits from a read word | |
679 | return demodEM4x05resp(32); | |
54a942b0 | 680 | } |
681 | ||
cb1ba30a | 682 | int 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 | } | |
696 | int 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 | |
cb1ba30a | 710 | if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) { |
711 | PrintAndLog("Address must be between 0 and 15"); | |
23f0a7d8 | 712 | return 1; |
713 | } | |
cb1ba30a | 714 | if ( pwd == -1 ) |
715 | PrintAndLog("Writing address %d data %08X", addr, data); | |
716 | else { | |
717 | usePwd = true; | |
718 | PrintAndLog("Writing address %d data %08X using password %08X", addr, data, pwd); | |
719 | } | |
23f0a7d8 | 720 | |
cb1ba30a | 721 | uint16_t flag = (addr << 8 ) | usePwd; |
23f0a7d8 | 722 | |
cb1ba30a | 723 | UsbCommand c = {CMD_EM4X_WRITE_WORD, {flag, data, pwd}}; |
724 | clearCommandBuffer(); | |
23f0a7d8 | 725 | SendCommand(&c); |
cb1ba30a | 726 | UsbCommand resp; |
727 | if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){ | |
728 | PrintAndLog("Error occurred, device did not respond during write operation."); | |
729 | return -1; | |
730 | } | |
ff9c043d | 731 | |
732 | //get response if there is one | |
733 | uint8_t got[6000]; // 8 bit preamble + 32 bit word response (max clock (128) * 40bits = 5120 samples) | |
734 | GetFromBigBuf(got, sizeof(got), 0); | |
bd09006a | 735 | if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) { |
ff9c043d | 736 | PrintAndLog("command execution time out"); |
737 | return -2; | |
738 | } | |
739 | setGraphBuf(got, sizeof(got)); | |
740 | ||
62dc7d4a | 741 | //todo: check response for 00001010 then write data for write confirmation! |
ff9c043d | 742 | |
62dc7d4a | 743 | //attempt demod: |
744 | //need 0 bits demoded (after preamble) to verify write cmd | |
745 | int result = demodEM4x05resp(0); | |
746 | if (result == 1) { | |
747 | PrintAndLog("Write Verified"); | |
ff9c043d | 748 | } |
62dc7d4a | 749 | return result; |
54a942b0 | 750 | } |
751 | ||
cb1ba30a | 752 | static command_t CommandTable[] = { |
753 | {"help", CmdHelp, 1, "This help"}, | |
754 | {"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"}, | |
755 | {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag in GraphBuffer"}, | |
756 | {"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"}, | |
757 | {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"}, | |
758 | {"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" }, | |
759 | {"em410xwrite", CmdEM410xWrite, 0, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"}, | |
ff9c043d | 760 | {"em4x50read", CmdEM4x50Read, 1, "demod data from EM4x50 tag from the graphbuffer"}, |
761 | {"readword", CmdReadWord, 1, "read EM4x05/4x69 data"}, | |
762 | {"writeword", CmdWriteWord, 1, "write EM405/4x69 data"}, | |
23f0a7d8 | 763 | {NULL, NULL, 0, NULL} |
7fe9b0b7 | 764 | }; |
765 | ||
4c36581b | 766 | int CmdLFEM4X(const char *Cmd) { |
767 | clearCommandBuffer(); | |
23f0a7d8 | 768 | CmdsParse(CommandTable, Cmd); |
769 | return 0; | |
7fe9b0b7 | 770 | } |
771 | ||
4c36581b | 772 | int CmdHelp(const char *Cmd) { |
23f0a7d8 | 773 | CmdsHelp(CommandTable); |
774 | return 0; | |
7fe9b0b7 | 775 | } |