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ADD: started to add tracelog in legic
[proxmark3-svn] / client / cmdhflegic.c
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 // High frequency Legic commands
9 //-----------------------------------------------------------------------------
10 #include "cmdhflegic.h"
11
12 static int CmdHelp(const char *Cmd);
13
14 #define SESSION_IV 0x55
15 #define MAX_LENGTH 1024
16
17 int usage_legic_calccrc8(void){
18 PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
19 PrintAndLog("There must be an even number of hexsymbols as input.");
20 PrintAndLog("Usage: hf legic crc8 [h] b <hexbytes> u <uidcrc> c <crc type>");
21 PrintAndLog("Options:");
22 PrintAndLog(" h : this help");
23 PrintAndLog(" b <hexbytes> : hex bytes");
24 PrintAndLog(" u <uidcrc> : MCC hexbyte");
25 PrintAndLog(" c <crc type> : 8|16 bit crc size");
26 PrintAndLog("");
27 PrintAndLog("Samples:");
28 PrintAndLog(" hf legic crc8 b deadbeef1122");
29 PrintAndLog(" hf legic crc8 b deadbeef1122 u 9A c 16");
30 return 0;
31 }
32 int usage_legic_load(void){
33 PrintAndLog("It loads datasamples from the file `filename` to device memory");
34 PrintAndLog("Usage: hf legic load [h] <file name>");
35 PrintAndLog("Options:");
36 PrintAndLog(" h : this help");
37 PrintAndLog(" <filename> : Name of file to load");
38 PrintAndLog("");
39 PrintAndLog("Samples:");
40 PrintAndLog(" hf legic load filename");
41 return 0;
42 }
43 int usage_legic_read(void){
44 PrintAndLog("Read data from a legic tag.");
45 PrintAndLog("Usage: hf legic read [h] <offset> <length> <IV>");
46 PrintAndLog("Options:");
47 PrintAndLog(" h : this help");
48 PrintAndLog(" <offset> : offset in data array to start download from");
49 PrintAndLog(" <length> : number of bytes to download");
50 PrintAndLog(" <IV> : (optional) Initialization vector to use");
51 PrintAndLog("");
52 PrintAndLog("Samples:");
53 PrintAndLog(" hf legic read");
54 PrintAndLog(" hf legic read 10 4");
55 return 0;
56 }
57 int usage_legic_sim(void){
58 PrintAndLog("Missing help text.");
59 return 0;
60 }
61 int usage_legic_write(void){
62 PrintAndLog(" Write sample buffer to a legic tag. (use after load or read)");
63 PrintAndLog("Usage: hf legic write [h] <offset> <length> <IV>");
64 PrintAndLog("Options:");
65 PrintAndLog(" h : this help");
66 PrintAndLog(" <offset> : offset in data array to start writing from");
67 PrintAndLog(" <length> : number of bytes to write");
68 PrintAndLog(" <IV> : (optional) Initialization vector to use");
69 PrintAndLog("");
70 PrintAndLog("Samples:");
71 PrintAndLog(" hf legic write");
72 PrintAndLog(" hf legic write 10 4");
73 return 0;
74 }
75 int usage_legic_rawwrite(void){
76 PrintAndLog("Write raw data direct to a specific address on legic tag.");
77 PrintAndLog("Usage: hf legic writeraw [h] <address> <value> <IV>");
78 PrintAndLog("Options:");
79 PrintAndLog(" h : this help");
80 PrintAndLog(" <address> : address to write to");
81 PrintAndLog(" <value> : value to write");
82 PrintAndLog(" <IV> : (optional) Initialization vector to use");
83 PrintAndLog("");
84 PrintAndLog("Samples:");
85 PrintAndLog(" hf legic writeraw");
86 PrintAndLog(" hf legic writeraw 10 4");
87 return 0;
88 }
89 int usage_legic_fill(void){
90 PrintAndLog("Missing help text.");
91 return 0;
92 }
93
94 /*
95 * Output BigBuf and deobfuscate LEGIC RF tag data.
96 * This is based on information given in the talk held
97 * by Henryk Ploetz and Karsten Nohl at 26c3
98 */
99 int CmdLegicDecode(const char *Cmd) {
100
101 int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
102 int crc = 0, wrp = 0, wrc = 0;
103 uint8_t stamp_len = 0;
104 uint8_t data_buf[1052]; // receiver buffer
105 char token_type[5] = {0,0,0,0,0};
106 int dcf = 0;
107 int bIsSegmented = 0;
108
109 // download EML memory, where the "legic read" command puts the data.
110 // copy data from proxmark into buffer
111 GetFromBigBuf(data_buf,sizeof(data_buf),0);
112 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
113 PrintAndLog("Command execute timeout");
114 return 1;
115 }
116
117 // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
118 crc = data_buf[4];
119 uint32_t calc_crc = CRC8Legic(data_buf, 4);
120
121 PrintAndLog("\nCDF: System Area");
122 PrintAndLog("------------------------------------------------------");
123 PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
124 data_buf[0],
125 data_buf[1],
126 data_buf[2],
127 data_buf[3],
128 data_buf[4],
129 (calc_crc == crc) ? "OK":"Fail"
130 );
131
132
133 token_type[0] = 0;
134 dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];
135
136 // New unwritten media?
137 if(dcf == 0xFFFF) {
138
139 PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
140 dcf,
141 data_buf[5],
142 data_buf[6]
143 );
144
145 } else if(dcf > 60000) { // Master token?
146
147 int fl = 0;
148
149 if(data_buf[6] == 0xec) {
150 strncpy(token_type, "XAM", sizeof(token_type));
151 fl = 1;
152 stamp_len = 0x0c - (data_buf[5] >> 4);
153 } else {
154 switch (data_buf[5] & 0x7f) {
155 case 0x00 ... 0x2f:
156 strncpy(token_type, "IAM", sizeof(token_type));
157 fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
158 break;
159 case 0x30 ... 0x6f:
160 strncpy(token_type, "SAM", sizeof(token_type));
161 fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
162 break;
163 case 0x70 ... 0x7f:
164 strncpy(token_type, "GAM", sizeof(token_type));
165 fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
166 break;
167 }
168
169 stamp_len = 0xfc - data_buf[6];
170 }
171
172 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
173 dcf,
174 data_buf[5],
175 data_buf[6],
176 token_type,
177 (data_buf[5] & 0x80 )>> 7,
178 stamp_len,
179 fl
180 );
181
182 } else { // Is IM(-S) type of card...
183
184 if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
185 bIsSegmented = 1;
186 strncpy(token_type, "IM-S", sizeof(token_type));
187 } else {
188 strncpy(token_type, "IM", sizeof(token_type));
189 }
190
191 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
192 dcf,
193 data_buf[5],
194 data_buf[6],
195 token_type,
196 (data_buf[5]&0x80) >> 7
197 );
198 }
199
200 // Makes no sence to show this on blank media...
201 if(dcf != 0xFFFF) {
202
203 if(bIsSegmented) {
204 PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
205 data_buf[7] & 0x0f,
206 (data_buf[7] & 0x70) >> 4,
207 (data_buf[7] & 0x80) >> 7,
208 data_buf[8]
209 );
210 }
211
212 // Header area is only available on IM-S cards, on master tokens this data is the master token data itself
213 if(bIsSegmented || dcf > 60000) {
214 if(dcf > 60000) {
215 PrintAndLog("Master token data");
216 PrintAndLog("%s", sprint_hex(data_buf+8, 14));
217 } else {
218 PrintAndLog("Remaining Header Area");
219 PrintAndLog("%s", sprint_hex(data_buf+9, 13));
220 }
221 }
222 }
223
224 uint8_t segCrcBytes[8] = {0,0,0,0,0,0,0,0};
225 uint32_t segCalcCRC = 0;
226 uint32_t segCRC = 0;
227
228 // Data card?
229 if(dcf <= 60000) {
230
231 PrintAndLog("\nADF: User Area");
232 PrintAndLog("------------------------------------------------------");
233
234 if(bIsSegmented) {
235
236 // Data start point on segmented cards
237 i = 22;
238
239 // decode segments
240 for (segmentNum=1; segmentNum < 128; segmentNum++ )
241 {
242 segment_len = ((data_buf[i+1] ^ crc) & 0x0f) * 256 + (data_buf[i] ^ crc);
243 segment_flag = ((data_buf[i+1] ^ crc) & 0xf0) >> 4;
244 wrp = (data_buf[i+2] ^ crc);
245 wrc = ((data_buf[i+3] ^ crc) & 0x70) >> 4;
246
247 bool hasWRC = (wrc > 0);
248 bool hasWRP = (wrp > wrc);
249 int wrp_len = (wrp - wrc);
250 int remain_seg_payload_len = (segment_len - wrp - 5);
251
252 // validate segment-crc
253 segCrcBytes[0]=data_buf[0]; //uid0
254 segCrcBytes[1]=data_buf[1]; //uid1
255 segCrcBytes[2]=data_buf[2]; //uid2
256 segCrcBytes[3]=data_buf[3]; //uid3
257 segCrcBytes[4]=(data_buf[i] ^ crc); //hdr0
258 segCrcBytes[5]=(data_buf[i+1] ^ crc); //hdr1
259 segCrcBytes[6]=(data_buf[i+2] ^ crc); //hdr2
260 segCrcBytes[7]=(data_buf[i+3] ^ crc); //hdr3
261
262 segCalcCRC = CRC8Legic(segCrcBytes, 8);
263 segCRC = data_buf[i+4] ^ crc;
264
265 PrintAndLog("Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u, Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
266 segmentNum,
267 data_buf[i] ^ crc,
268 data_buf[i+1] ^ crc,
269 data_buf[i+2] ^ crc,
270 data_buf[i+3] ^ crc,
271 segment_len,
272 segment_flag,
273 (segment_flag & 0x4) >> 2,
274 (segment_flag & 0x8) >> 3,
275 wrp,
276 wrc,
277 ((data_buf[i+3]^crc) & 0x80) >> 7,
278 segCRC,
279 ( segCRC == segCalcCRC ) ? "OK" : "fail"
280 );
281
282 i += 5;
283
284 if ( hasWRC ) {
285 PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
286 PrintAndLog("\nrow | data");
287 PrintAndLog("-----+------------------------------------------------");
288
289 for ( k=i; k < (i + wrc); ++k)
290 data_buf[k] ^= crc;
291
292 print_hex_break( data_buf+i, wrc, 16);
293
294 i += wrc;
295 }
296
297 if ( hasWRP ) {
298 PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
299 PrintAndLog("\nrow | data");
300 PrintAndLog("-----+------------------------------------------------");
301
302 for (k=i; k < (i+wrp_len); ++k)
303 data_buf[k] ^= crc;
304
305 print_hex_break( data_buf+i, wrp_len, 16);
306
307 i += wrp_len;
308
309 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
310 if( wrp_len == 8 )
311 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
312 }
313
314 PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
315 PrintAndLog("\nrow | data");
316 PrintAndLog("-----+------------------------------------------------");
317
318 for ( k=i; k < (i+remain_seg_payload_len); ++k)
319 data_buf[k] ^= crc;
320
321 print_hex_break( data_buf+i, remain_seg_payload_len, 16);
322
323 i += remain_seg_payload_len;
324
325 PrintAndLog("-----+------------------------------------------------\n");
326
327 // end with last segment
328 if (segment_flag & 0x8) return 0;
329
330 } // end for loop
331
332 } else {
333
334 // Data start point on unsegmented cards
335 i = 8;
336
337 wrp = data_buf[7] & 0x0F;
338 wrc = (data_buf[7] & 0x70) >> 4;
339
340 bool hasWRC = (wrc > 0);
341 bool hasWRP = (wrp > wrc);
342 int wrp_len = (wrp - wrc);
343 int remain_seg_payload_len = (1024 - 22 - wrp); // Any chance to get physical card size here!?
344
345 PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
346 wrp,
347 wrc,
348 (data_buf[7] & 0x80) >> 7
349 );
350
351 if ( hasWRC ) {
352 PrintAndLog("WRC protected area: (I %d | WRC %d)", i, wrc);
353 PrintAndLog("\nrow | data");
354 PrintAndLog("-----+------------------------------------------------");
355 print_hex_break( data_buf+i, wrc, 16);
356 i += wrc;
357 }
358
359 if ( hasWRP ) {
360 PrintAndLog("Remaining write protected area: (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
361 PrintAndLog("\nrow | data");
362 PrintAndLog("-----+------------------------------------------------");
363 print_hex_break( data_buf + i, wrp_len, 16);
364 i += wrp_len;
365
366 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
367 if( wrp_len == 8 )
368 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4], data_buf[i-3], data_buf[i-2]);
369 }
370
371 PrintAndLog("Remaining segment payload: (I %d | Remain LEN %d)", i, remain_seg_payload_len);
372 PrintAndLog("\nrow | data");
373 PrintAndLog("-----+------------------------------------------------");
374 print_hex_break( data_buf + i, remain_seg_payload_len, 16);
375 i += remain_seg_payload_len;
376
377 PrintAndLog("-----+------------------------------------------------\n");
378 }
379 }
380 return 0;
381 }
382
383 int CmdLegicRFRead(const char *Cmd) {
384
385 // params:
386 // offset in data
387 // number of bytes.
388 char cmdp = param_getchar(Cmd, 0);
389 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
390
391 uint32_t offset = 0, len = 0, IV = 0;
392 sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
393
394 // OUT-OF-BOUNDS check
395 if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
396
397 IV &= 0x7F;
398 PrintAndLog("Current IV: 0x%02x", IV);
399
400 UsbCommand c= {CMD_READER_LEGIC_RF, {offset, len, IV}};
401 clearCommandBuffer();
402 SendCommand(&c);
403 return 0;
404 }
405
406 int CmdLegicLoad(const char *Cmd) {
407
408 // iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :)
409 char cmdp = param_getchar(Cmd, 0);
410 if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
411
412 char filename[FILE_PATH_SIZE] = {0x00};
413 int len = strlen(Cmd);
414
415 if (len > FILE_PATH_SIZE) {
416 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
417 return 0;
418 }
419 memcpy(filename, Cmd, len);
420
421 FILE *f = fopen(filename, "r");
422 if(!f) {
423 PrintAndLog("couldn't open '%s'", Cmd);
424 return -1;
425 }
426
427 char line[80];
428 int offset = 0;
429 uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
430 int index = 0;
431 int totalbytes = 0;
432 while ( fgets(line, sizeof(line), f) ) {
433 int res = sscanf(line, "%x %x %x %x %x %x %x %x",
434 (unsigned int *)&data[index],
435 (unsigned int *)&data[index + 1],
436 (unsigned int *)&data[index + 2],
437 (unsigned int *)&data[index + 3],
438 (unsigned int *)&data[index + 4],
439 (unsigned int *)&data[index + 5],
440 (unsigned int *)&data[index + 6],
441 (unsigned int *)&data[index + 7]);
442
443 if(res != 8) {
444 PrintAndLog("Error: could not read samples");
445 fclose(f);
446 return -1;
447 }
448 index += res;
449
450 if ( index == USB_CMD_DATA_SIZE ){
451 // PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
452 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
453 memcpy(c.d.asBytes, data, sizeof(data));
454 clearCommandBuffer();
455 SendCommand(&c);
456 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
457 PrintAndLog("Command execute timeout");
458 fclose(f);
459 return 1;
460 }
461 offset += index;
462 totalbytes += index;
463 index = 0;
464 }
465 }
466 fclose(f);
467
468 // left over bytes?
469 if ( index != 0 ) {
470 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
471 memcpy(c.d.asBytes, data, 8);
472 clearCommandBuffer();
473 SendCommand(&c);
474 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
475 PrintAndLog("Command execute timeout");
476 return 1;
477 }
478 totalbytes += index;
479 }
480
481 PrintAndLog("loaded %u samples", totalbytes);
482 return 0;
483 }
484
485 int CmdLegicSave(const char *Cmd) {
486 int requested = 1024;
487 int offset = 0;
488 int delivered = 0;
489 char filename[FILE_PATH_SIZE] = {0x00};
490 uint8_t got[1024] = {0x00};
491
492 memset(filename, 0, FILE_PATH_SIZE);
493
494 sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
495
496 /* If no length given save entire legic read buffer */
497 /* round up to nearest 8 bytes so the saved data can be used with legicload */
498 if (requested == 0)
499 requested = 1024;
500
501 if (requested % 8 != 0) {
502 int remainder = requested % 8;
503 requested = requested + 8 - remainder;
504 }
505
506 if (offset + requested > sizeof(got)) {
507 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
508 return 0;
509 }
510
511 GetFromBigBuf(got, requested, offset);
512 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
513 PrintAndLog("Command execute timeout");
514 return 1;
515 }
516
517 FILE *f = fopen(filename, "w");
518 if(!f) {
519 PrintAndLog("couldn't open '%s'", Cmd+1);
520 return -1;
521 }
522
523 for (int j = 0; j < requested; j += 8) {
524 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
525 got[j+0], got[j+1], got[j+2], got[j+3],
526 got[j+4], got[j+5], got[j+6], got[j+7]
527 );
528 delivered += 8;
529 if (delivered >= requested) break;
530 }
531
532 fclose(f);
533 PrintAndLog("saved %u samples", delivered);
534 return 0;
535 }
536
537 //TODO: write a help text (iceman)
538 int CmdLegicRfSim(const char *Cmd) {
539 UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
540 sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
541 clearCommandBuffer();
542 SendCommand(&c);
543 return 0;
544 }
545
546 int CmdLegicRfWrite(const char *Cmd) {
547
548 // params:
549 // offset - in tag memory
550 // length - num of bytes to be written
551 // IV - initialisation vector
552
553 char cmdp = param_getchar(Cmd, 0);
554 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_write();
555
556 uint32_t offset = 0, len = 0, IV = SESSION_IV;
557
558 UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}};
559 int res = sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
560 if(res < 2) {
561 PrintAndLog("Please specify the offset and length as two hex strings and, optionally, the IV also as an hex string");
562 return -1;
563 }
564
565 // OUT-OF-BOUNDS check
566 if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
567
568
569 IV &= 0x7F;
570 PrintAndLog("Current IV: 0x%02x", IV);
571
572 c.arg[0] = offset;
573 c.arg[1] = len;
574 c.arg[2] = IV;
575
576 clearCommandBuffer();
577 SendCommand(&c);
578 return 0;
579 }
580
581 int CmdLegicRfRawWrite(const char *Cmd) {
582
583 char cmdp = param_getchar(Cmd, 0);
584 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_rawwrite();
585
586 uint32_t address = 0, data = 0, IV = SESSION_IV;
587 char answer;
588
589 UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
590 int res = sscanf(Cmd, "%x %x %x", &address, &data, &IV);
591 if(res < 2)
592 return usage_legic_rawwrite();
593
594 // OUT-OF-BOUNDS check
595 if(address > MAX_LENGTH)
596 return usage_legic_rawwrite();
597
598 IV &= 0x7F;
599 PrintAndLog("Current IV: 0x%02x", IV);
600
601 c.arg[0] = address;
602 c.arg[1] = data;
603 c.arg[2] = IV;
604
605 if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
606 PrintAndLog("############# DANGER !! #############");
607 PrintAndLog("# changing the DCF is irreversible #");
608 PrintAndLog("#####################################");
609 PrintAndLog("do youe really want to continue? y(es) n(o)");
610 if (scanf(" %c", &answer) > 0 && (answer == 'y' || answer == 'Y')) {
611 SendCommand(&c);
612 return 0;
613 }
614 return -1;
615 }
616
617 clearCommandBuffer();
618 SendCommand(&c);
619 return 0;
620 }
621
622 //TODO: write a help text (iceman)
623 int CmdLegicRfFill(const char *Cmd) {
624 UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
625 int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
626 if(res != 3) {
627 PrintAndLog("Please specify the offset, length and value as two hex strings");
628 return -1;
629 }
630
631 int i;
632 UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
633 memset(c.d.asBytes, cmd.arg[2], 48);
634
635 for(i = 0; i < 22; i++) {
636 c.arg[0] = i*48;
637
638 clearCommandBuffer();
639 SendCommand(&c);
640 WaitForResponse(CMD_ACK, NULL);
641 }
642 clearCommandBuffer();
643 SendCommand(&cmd);
644 return 0;
645 }
646
647 int CmdLegicCalcCrc8(const char *Cmd){
648
649 uint8_t *data = NULL;
650 uint8_t cmdp = 0, uidcrc = 0, type=0;
651 bool errors = false;
652 int len = 0;
653 int bg, en;
654
655 while(param_getchar(Cmd, cmdp) != 0x00) {
656 switch(param_getchar(Cmd, cmdp)) {
657 case 'b':
658 case 'B':
659 // peek at length of the input string so we can
660 // figure out how many elements to malloc in "data"
661 bg=en=0;
662 if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
663 errors = true;
664 break;
665 }
666 len = (en - bg + 1);
667
668 // check that user entered even number of characters
669 // for hex data string
670 if (len & 1) {
671 errors = true;
672 break;
673 }
674
675 // it's possible for user to accidentally enter "b" parameter
676 // more than once - we have to clean previous malloc
677 if (data) free(data);
678 data = malloc(len >> 1);
679 if ( data == NULL ) {
680 PrintAndLog("Can't allocate memory. exiting");
681 errors = true;
682 break;
683 }
684
685 if (param_gethex(Cmd, cmdp+1, data, len)) {
686 errors = true;
687 break;
688 }
689
690 len >>= 1;
691 cmdp += 2;
692 break;
693 case 'u':
694 case 'U':
695 uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
696 cmdp += 2;
697 break;
698 case 'c':
699 case 'C':
700 type = param_get8ex(Cmd, cmdp+1, 0, 10);
701 cmdp += 2;
702 break;
703 case 'h':
704 case 'H':
705 errors = true;
706 break;
707 default:
708 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
709 errors = true;
710 break;
711 }
712 if (errors) break;
713 }
714 //Validations
715 if (errors){
716 if (data) free(data);
717 return usage_legic_calccrc8();
718 }
719
720 switch (type){
721 case 16:
722 PrintAndLog("LEGIC CRC16: %X", CRC16Legic(data, len, uidcrc));
723 break;
724 default:
725 PrintAndLog("LEGIC CRC8: %X", CRC8Legic(data, len) );
726 break;
727 }
728
729 if (data) free(data);
730 return 0;
731 }
732
733 static command_t CommandTable[] = {
734 {"help", CmdHelp, 1, "This help"},
735 {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
736 {"read", CmdLegicRFRead, 0, "[offset][length] <iv> -- read bytes from a LEGIC card"},
737 {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
738 {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
739 {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
740 {"write", CmdLegicRfWrite,0, "<offset> <length> <iv> -- Write sample buffer (user after load or read)"},
741 {"writeraw",CmdLegicRfRawWrite, 0, "<address> <value> <iv> -- Write direct to address"},
742 {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
743 {"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
744 {NULL, NULL, 0, NULL}
745 };
746
747 int CmdHFLegic(const char *Cmd) {
748 clearCommandBuffer();
749 CmdsParse(CommandTable, Cmd);
750 return 0;
751 }
752
753 int CmdHelp(const char *Cmd) {
754 CmdsHelp(CommandTable);
755 return 0;
756 }
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