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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 // High frequency Legic commands
9 //-----------------------------------------------------------------------------
10 #include "cmdhflegic.h"
11
12 static int CmdHelp(const char *Cmd);
13
14 #define MAX_LENGTH 1024
15
16 int usage_legic_calccrc8(void){
17 PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
18 PrintAndLog("There must be an even number of hexsymbols as input.");
19 PrintAndLog("Usage: hf legic crc8 [h] b <hexbytes> u <uidcrc> c <crc type>");
20 PrintAndLog("Options:");
21 PrintAndLog(" h : this help");
22 PrintAndLog(" b <hexbytes> : hex bytes");
23 PrintAndLog(" u <uidcrc> : MCC hexbyte");
24 PrintAndLog(" c <crc type> : 8|16 bit crc size");
25 PrintAndLog("");
26 PrintAndLog("Samples:");
27 PrintAndLog(" hf legic crc8 b deadbeef1122");
28 PrintAndLog(" hf legic crc8 b deadbeef1122 u 9A c 16");
29 return 0;
30 }
31 int usage_legic_load(void){
32 PrintAndLog("It loads datasamples from the file `filename` to device memory");
33 PrintAndLog("Usage: hf legic load [h] <file name>");
34 PrintAndLog("Options:");
35 PrintAndLog(" h : this help");
36 PrintAndLog(" <filename> : Name of file to load");
37 PrintAndLog("");
38 PrintAndLog("Samples:");
39 PrintAndLog(" hf legic load filename");
40 return 0;
41 }
42 int usage_legic_read(void){
43 PrintAndLog("Read data from a legic tag.");
44 PrintAndLog("Usage: hf legic read [h] <offset> <length> <IV>");
45 PrintAndLog("Options:");
46 PrintAndLog(" h : this help");
47 PrintAndLog(" <offset> : offset in data array to start download from");
48 PrintAndLog(" <length> : number of bytes to download");
49 PrintAndLog(" <IV> : (optional) Initialization vector to use (ODD and 7bits)");
50 PrintAndLog("");
51 PrintAndLog("Samples:");
52 PrintAndLog(" hf legic read");
53 PrintAndLog(" hf legic read 10 4");
54 return 0;
55 }
56 int usage_legic_sim(void){
57 PrintAndLog("Missing help text.");
58 return 0;
59 }
60 int usage_legic_write(void){
61 PrintAndLog(" Write sample buffer to a legic tag. (use after load or read)");
62 PrintAndLog("Usage: hf legic write [h] <offset> <length> <IV>");
63 PrintAndLog("Options:");
64 PrintAndLog(" h : this help");
65 PrintAndLog(" <offset> : offset in data array to start writing from");
66 PrintAndLog(" <length> : number of bytes to write");
67 PrintAndLog(" <IV> : (optional) Initialization vector to use (ODD and 7bits)");
68 PrintAndLog("");
69 PrintAndLog("Samples:");
70 PrintAndLog(" hf legic write");
71 PrintAndLog(" hf legic write 10 4");
72 return 0;
73 }
74 int usage_legic_rawwrite(void){
75 PrintAndLog("Write raw data direct to a specific address on legic tag.");
76 PrintAndLog("Usage: hf legic writeraw [h] <address> <value> <IV>");
77 PrintAndLog("Options:");
78 PrintAndLog(" h : this help");
79 PrintAndLog(" <address> : address to write to");
80 PrintAndLog(" <value> : value to write");
81 PrintAndLog(" <IV> : (optional) Initialization vector to use (ODD and 7bits)");
82 PrintAndLog("");
83 PrintAndLog("Samples:");
84 PrintAndLog(" hf legic writeraw");
85 PrintAndLog(" hf legic writeraw 10 4");
86 return 0;
87 }
88 int usage_legic_fill(void){
89 PrintAndLog("Missing help text.");
90 return 0;
91 }
92 int usage_legic_info(void){
93 PrintAndLog("Read info from a legic tag.");
94 PrintAndLog("Usage: hf legic info [h]");
95 PrintAndLog("Options:");
96 PrintAndLog(" h : this help");
97 PrintAndLog("");
98 PrintAndLog("Samples:");
99 PrintAndLog(" hf legic info");
100 return 0;
101 }
102 /*
103 * Output BigBuf and deobfuscate LEGIC RF tag data.
104 * This is based on information given in the talk held
105 * by Henryk Ploetz and Karsten Nohl at 26c3
106 */
107 int CmdLegicDecode(const char *Cmd) {
108
109 int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
110 int crc = 0, wrp = 0, wrc = 0;
111 uint8_t stamp_len = 0;
112 uint8_t data_buf[1024]; // receiver buffer
113 char token_type[5] = {0,0,0,0,0};
114 int dcf = 0;
115 int bIsSegmented = 0;
116
117 // copy data from proxmark into buffer
118 GetFromBigBuf(data_buf,sizeof(data_buf),0);
119 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
120 PrintAndLog("Command execute timeout");
121 return 1;
122 }
123
124 // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
125 crc = data_buf[4];
126 uint32_t calc_crc = CRC8Legic(data_buf, 4);
127
128 PrintAndLog("\nCDF: System Area");
129 PrintAndLog("------------------------------------------------------");
130 PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
131 data_buf[0],
132 data_buf[1],
133 data_buf[2],
134 data_buf[3],
135 data_buf[4],
136 (calc_crc == crc) ? "OK":"Fail"
137 );
138
139
140 token_type[0] = 0;
141 dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];
142
143 // New unwritten media?
144 if(dcf == 0xFFFF) {
145
146 PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
147 dcf,
148 data_buf[5],
149 data_buf[6]
150 );
151
152 } else if(dcf > 60000) { // Master token?
153
154 int fl = 0;
155
156 if(data_buf[6] == 0xec) {
157 strncpy(token_type, "XAM", sizeof(token_type));
158 fl = 1;
159 stamp_len = 0x0c - (data_buf[5] >> 4);
160 } else {
161 switch (data_buf[5] & 0x7f) {
162 case 0x00 ... 0x2f:
163 strncpy(token_type, "IAM", sizeof(token_type));
164 fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
165 break;
166 case 0x30 ... 0x6f:
167 strncpy(token_type, "SAM", sizeof(token_type));
168 fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
169 break;
170 case 0x70 ... 0x7f:
171 strncpy(token_type, "GAM", sizeof(token_type));
172 fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
173 break;
174 }
175
176 stamp_len = 0xfc - data_buf[6];
177 }
178
179 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
180 dcf,
181 data_buf[5],
182 data_buf[6],
183 token_type,
184 (data_buf[5] & 0x80 )>> 7,
185 stamp_len,
186 fl
187 );
188
189 } else { // Is IM(-S) type of card...
190
191 if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
192 bIsSegmented = 1;
193 strncpy(token_type, "IM-S", sizeof(token_type));
194 } else {
195 strncpy(token_type, "IM", sizeof(token_type));
196 }
197
198 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
199 dcf,
200 data_buf[5],
201 data_buf[6],
202 token_type,
203 (data_buf[5]&0x80) >> 7
204 );
205 }
206
207 // Makes no sence to show this on blank media...
208 if(dcf != 0xFFFF) {
209
210 if(bIsSegmented) {
211 PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
212 data_buf[7] & 0x0f,
213 (data_buf[7] & 0x70) >> 4,
214 (data_buf[7] & 0x80) >> 7,
215 data_buf[8]
216 );
217 }
218
219 // Header area is only available on IM-S cards, on master tokens this data is the master token data itself
220 if(bIsSegmented || dcf > 60000) {
221 if(dcf > 60000) {
222 PrintAndLog("Master token data");
223 PrintAndLog("%s", sprint_hex(data_buf+8, 14));
224 } else {
225 PrintAndLog("Remaining Header Area");
226 PrintAndLog("%s", sprint_hex(data_buf+9, 13));
227 }
228 }
229 }
230
231 uint8_t segCrcBytes[8] = {0,0,0,0,0,0,0,0};
232 uint32_t segCalcCRC = 0;
233 uint32_t segCRC = 0;
234
235 // Data card?
236 if(dcf <= 60000) {
237
238 PrintAndLog("\nADF: User Area");
239 PrintAndLog("------------------------------------------------------");
240
241 if(bIsSegmented) {
242
243 // Data start point on segmented cards
244 i = 22;
245
246 // decode segments
247 for (segmentNum=1; segmentNum < 128; segmentNum++ )
248 {
249 segment_len = ((data_buf[i+1] ^ crc) & 0x0f) * 256 + (data_buf[i] ^ crc);
250 segment_flag = ((data_buf[i+1] ^ crc) & 0xf0) >> 4;
251 wrp = (data_buf[i+2] ^ crc);
252 wrc = ((data_buf[i+3] ^ crc) & 0x70) >> 4;
253
254 bool hasWRC = (wrc > 0);
255 bool hasWRP = (wrp > wrc);
256 int wrp_len = (wrp - wrc);
257 int remain_seg_payload_len = (segment_len - wrp - 5);
258
259 // validate segment-crc
260 segCrcBytes[0]=data_buf[0]; //uid0
261 segCrcBytes[1]=data_buf[1]; //uid1
262 segCrcBytes[2]=data_buf[2]; //uid2
263 segCrcBytes[3]=data_buf[3]; //uid3
264 segCrcBytes[4]=(data_buf[i] ^ crc); //hdr0
265 segCrcBytes[5]=(data_buf[i+1] ^ crc); //hdr1
266 segCrcBytes[6]=(data_buf[i+2] ^ crc); //hdr2
267 segCrcBytes[7]=(data_buf[i+3] ^ crc); //hdr3
268
269 segCalcCRC = CRC8Legic(segCrcBytes, 8);
270 segCRC = data_buf[i+4] ^ crc;
271
272 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)",
273 segmentNum,
274 data_buf[i] ^ crc,
275 data_buf[i+1] ^ crc,
276 data_buf[i+2] ^ crc,
277 data_buf[i+3] ^ crc,
278 segment_len,
279 segment_flag,
280 (segment_flag & 0x4) >> 2,
281 (segment_flag & 0x8) >> 3,
282 wrp,
283 wrc,
284 ((data_buf[i+3]^crc) & 0x80) >> 7,
285 segCRC,
286 ( segCRC == segCalcCRC ) ? "OK" : "fail"
287 );
288
289 i += 5;
290
291 if ( hasWRC ) {
292 PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
293 PrintAndLog("\nrow | data");
294 PrintAndLog("-----+------------------------------------------------");
295
296 for ( k=i; k < (i + wrc); ++k)
297 data_buf[k] ^= crc;
298
299 print_hex_break( data_buf+i, wrc, 16);
300
301 i += wrc;
302 }
303
304 if ( hasWRP ) {
305 PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
306 PrintAndLog("\nrow | data");
307 PrintAndLog("-----+------------------------------------------------");
308
309 for (k=i; k < (i+wrp_len); ++k)
310 data_buf[k] ^= crc;
311
312 print_hex_break( data_buf+i, wrp_len, 16);
313
314 i += wrp_len;
315
316 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
317 if( wrp_len == 8 )
318 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
319 }
320
321 PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
322 PrintAndLog("\nrow | data");
323 PrintAndLog("-----+------------------------------------------------");
324
325 for ( k=i; k < (i+remain_seg_payload_len); ++k)
326 data_buf[k] ^= crc;
327
328 print_hex_break( data_buf+i, remain_seg_payload_len, 16);
329
330 i += remain_seg_payload_len;
331
332 PrintAndLog("-----+------------------------------------------------\n");
333
334 // end with last segment
335 if (segment_flag & 0x8) return 0;
336
337 } // end for loop
338
339 } else {
340
341 // Data start point on unsegmented cards
342 i = 8;
343
344 wrp = data_buf[7] & 0x0F;
345 wrc = (data_buf[7] & 0x70) >> 4;
346
347 bool hasWRC = (wrc > 0);
348 bool hasWRP = (wrp > wrc);
349 int wrp_len = (wrp - wrc);
350 int remain_seg_payload_len = (1024 - 22 - wrp); // Any chance to get physical card size here!?
351
352 PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
353 wrp,
354 wrc,
355 (data_buf[7] & 0x80) >> 7
356 );
357
358 if ( hasWRC ) {
359 PrintAndLog("WRC protected area: (I %d | WRC %d)", i, wrc);
360 PrintAndLog("\nrow | data");
361 PrintAndLog("-----+------------------------------------------------");
362 print_hex_break( data_buf+i, wrc, 16);
363 i += wrc;
364 }
365
366 if ( hasWRP ) {
367 PrintAndLog("Remaining write protected area: (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
368 PrintAndLog("\nrow | data");
369 PrintAndLog("-----+------------------------------------------------");
370 print_hex_break( data_buf + i, wrp_len, 16);
371 i += wrp_len;
372
373 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
374 if( wrp_len == 8 )
375 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4], data_buf[i-3], data_buf[i-2]);
376 }
377
378 PrintAndLog("Remaining segment payload: (I %d | Remain LEN %d)", i, remain_seg_payload_len);
379 PrintAndLog("\nrow | data");
380 PrintAndLog("-----+------------------------------------------------");
381 print_hex_break( data_buf + i, remain_seg_payload_len, 16);
382 i += remain_seg_payload_len;
383
384 PrintAndLog("-----+------------------------------------------------\n");
385 }
386 }
387 return 0;
388 }
389
390 int CmdLegicRFRead(const char *Cmd) {
391
392 // params:
393 // offset in data memory
394 // number of bytes to read
395 char cmdp = param_getchar(Cmd, 0);
396 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
397
398 uint32_t offset = 0, len = 0, IV = 1;
399 sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
400
401 // OUT-OF-BOUNDS check
402 if ( len + offset > MAX_LENGTH ) {
403 len = MAX_LENGTH - offset;
404 PrintAndLog("Out-of-bound, shorten len to %d", len);
405 }
406
407 if ( (IV & 0x7F) != IV ){
408 IV &= 0x7F;
409 PrintAndLog("Truncating IV to 7bits");
410 }
411
412 if ( (IV & 1) == 0 ){
413 IV |= 0x01;
414 PrintAndLog("LSB of IV must be SET");
415 }
416
417 //PrintAndLog("Using IV: 0x%02x | Offset: 0x%02x | Len: 0x%02x ", IV, offset, len);
418
419 UsbCommand c = {CMD_READER_LEGIC_RF, {offset, len, IV}};
420 clearCommandBuffer();
421 SendCommand(&c);
422 UsbCommand resp;
423 if (WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
424 uint8_t isOK = resp.arg[0] & 0xFF;
425 uint16_t len = resp.arg[1] & 0x3FF;
426 if ( isOK ) {
427 PrintAndLog("use 'hf legic decode'");
428
429 uint8_t *data = resp.d.asBytes;
430 PrintAndLog("\nData |");
431 PrintAndLog("-----------------------------");
432 PrintAndLog(" %s|\n", sprint_hex(data, len));
433 } else {
434 PrintAndLog("failed reading tag");
435 }
436 } else {
437 PrintAndLog("command execution time out");
438 return 1;
439 }
440 return 0;
441 }
442
443 int CmdLegicLoad(const char *Cmd) {
444
445 // iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :)
446 char cmdp = param_getchar(Cmd, 0);
447 if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
448
449 char filename[FILE_PATH_SIZE] = {0x00};
450 int len = strlen(Cmd);
451
452 if (len > FILE_PATH_SIZE) {
453 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
454 return 0;
455 }
456 memcpy(filename, Cmd, len);
457
458 FILE *f = fopen(filename, "r");
459 if(!f) {
460 PrintAndLog("couldn't open '%s'", Cmd);
461 return -1;
462 }
463
464 char line[80];
465 int offset = 0;
466 uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
467 int index = 0;
468 int totalbytes = 0;
469 while ( fgets(line, sizeof(line), f) ) {
470 int res = sscanf(line, "%x %x %x %x %x %x %x %x",
471 (unsigned int *)&data[index],
472 (unsigned int *)&data[index + 1],
473 (unsigned int *)&data[index + 2],
474 (unsigned int *)&data[index + 3],
475 (unsigned int *)&data[index + 4],
476 (unsigned int *)&data[index + 5],
477 (unsigned int *)&data[index + 6],
478 (unsigned int *)&data[index + 7]);
479
480 if(res != 8) {
481 PrintAndLog("Error: could not read samples");
482 fclose(f);
483 return -1;
484 }
485 index += res;
486
487 if ( index == USB_CMD_DATA_SIZE ){
488 // PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
489 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
490 memcpy(c.d.asBytes, data, sizeof(data));
491 clearCommandBuffer();
492 SendCommand(&c);
493 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
494 PrintAndLog("Command execute timeout");
495 fclose(f);
496 return 1;
497 }
498 offset += index;
499 totalbytes += index;
500 index = 0;
501 }
502 }
503 fclose(f);
504
505 // left over bytes?
506 if ( index != 0 ) {
507 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
508 memcpy(c.d.asBytes, data, 8);
509 clearCommandBuffer();
510 SendCommand(&c);
511 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
512 PrintAndLog("Command execute timeout");
513 return 1;
514 }
515 totalbytes += index;
516 }
517
518 PrintAndLog("loaded %u samples", totalbytes);
519 return 0;
520 }
521
522 int CmdLegicSave(const char *Cmd) {
523 int requested = 1024;
524 int offset = 0;
525 int delivered = 0;
526 char filename[FILE_PATH_SIZE] = {0x00};
527 uint8_t got[1024] = {0x00};
528
529 memset(filename, 0, FILE_PATH_SIZE);
530
531 sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
532
533 /* If no length given save entire legic read buffer */
534 /* round up to nearest 8 bytes so the saved data can be used with legicload */
535 if (requested == 0)
536 requested = 1024;
537
538 if (requested % 8 != 0) {
539 int remainder = requested % 8;
540 requested = requested + 8 - remainder;
541 }
542
543 if (offset + requested > sizeof(got)) {
544 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
545 return 0;
546 }
547
548 GetFromBigBuf(got, requested, offset);
549 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
550 PrintAndLog("Command execute timeout");
551 return 1;
552 }
553
554 FILE *f = fopen(filename, "w");
555 if(!f) {
556 PrintAndLog("couldn't open '%s'", Cmd+1);
557 return -1;
558 }
559
560 for (int j = 0; j < requested; j += 8) {
561 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
562 got[j+0], got[j+1], got[j+2], got[j+3],
563 got[j+4], got[j+5], got[j+6], got[j+7]
564 );
565 delivered += 8;
566 if (delivered >= requested) break;
567 }
568
569 fclose(f);
570 PrintAndLog("saved %u samples", delivered);
571 return 0;
572 }
573
574 //TODO: write a help text (iceman)
575 int CmdLegicRfSim(const char *Cmd) {
576 UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
577 sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
578 clearCommandBuffer();
579 SendCommand(&c);
580 return 0;
581 }
582
583 int CmdLegicRfWrite(const char *Cmd) {
584
585 // params:
586 // offset - in tag memory
587 // length - num of bytes to be written
588 // IV - initialisation vector
589
590 char cmdp = param_getchar(Cmd, 0);
591 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_write();
592
593 uint32_t offset = 0, len = 0, IV = 0;
594
595 UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}};
596 int res = sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
597 if(res < 2) {
598 PrintAndLog("Please specify the offset and length as two hex strings and, optionally, the IV also as an hex string");
599 return -1;
600 }
601
602 // OUT-OF-BOUNDS check
603 if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
604
605 if ( (IV & 0x7F) != IV ){
606 IV &= 0x7F;
607 PrintAndLog("Truncating IV to 7bits");
608 }
609 if ( (IV & 1) == 0 ){
610 IV |= 0x01; // IV must be odd
611 PrintAndLog("LSB of IV must be SET");
612 }
613
614 PrintAndLog("Current IV: 0x%02x", IV);
615
616 c.arg[0] = offset;
617 c.arg[1] = len;
618 c.arg[2] = IV;
619
620 clearCommandBuffer();
621 SendCommand(&c);
622 return 0;
623 }
624
625 int CmdLegicRfRawWrite(const char *Cmd) {
626
627 char cmdp = param_getchar(Cmd, 0);
628 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_rawwrite();
629
630 uint32_t address = 0, data = 0, IV = 0;
631 char answer;
632
633 UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
634 int res = sscanf(Cmd, "%x %x %x", &address, &data, &IV);
635 if(res < 2)
636 return usage_legic_rawwrite();
637
638 // OUT-OF-BOUNDS check
639 if(address > MAX_LENGTH)
640 return usage_legic_rawwrite();
641
642 if ( (IV & 0x7F) != IV ){
643 IV &= 0x7F;
644 PrintAndLog("Truncating IV to 7bits");
645 }
646 if ( (IV & 1) == 0 ){
647 IV |= 0x01; // IV must be odd
648 PrintAndLog("LSB of IV must be SET");
649 }
650 PrintAndLog("Current IV: 0x%02x", IV);
651
652 c.arg[0] = address;
653 c.arg[1] = data;
654 c.arg[2] = IV;
655
656 if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
657 PrintAndLog("############# DANGER !! #############");
658 PrintAndLog("# changing the DCF is irreversible #");
659 PrintAndLog("#####################################");
660 PrintAndLog("do youe really want to continue? y(es) n(o)");
661 if (scanf(" %c", &answer) > 0 && (answer == 'y' || answer == 'Y')) {
662 SendCommand(&c);
663 return 0;
664 }
665 return -1;
666 }
667
668 clearCommandBuffer();
669 SendCommand(&c);
670 return 0;
671 }
672
673 //TODO: write a help text (iceman)
674 int CmdLegicRfFill(const char *Cmd) {
675 UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
676 int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
677 if(res != 3) {
678 PrintAndLog("Please specify the offset, length and value as two hex strings");
679 return -1;
680 }
681
682 int i;
683 UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
684 memset(c.d.asBytes, cmd.arg[2], 48);
685
686 for(i = 0; i < 22; i++) {
687 c.arg[0] = i*48;
688
689 clearCommandBuffer();
690 SendCommand(&c);
691 WaitForResponse(CMD_ACK, NULL);
692 }
693 clearCommandBuffer();
694 SendCommand(&cmd);
695 return 0;
696 }
697
698 void static calc4(uint8_t *cmd, uint8_t len){
699 crc_t crc;
700 //crc_init_ref(&crc, 4, 0x19 >> 1, 0x5, 0, TRUE, TRUE);
701 crc_init(&crc, 4, 0x19 >> 1, 0x5, 0);
702
703 crc_clear(&crc);
704 crc_update(&crc, 1, 1); /* CMD_READ */
705 crc_update(&crc, cmd[0], 8);
706 crc_update(&crc, cmd[1], 8);
707 printf("crc4 %X\n", reflect(crc_finish(&crc), 4) ) ;
708
709 crc_clear(&crc);
710 crc_update(&crc, 1, 1); /* CMD_READ */
711 crc_update(&crc, cmd[0], 8);
712 crc_update(&crc, cmd[1], 8);
713 printf("crc4 %X\n", crc_finish(&crc) ) ;
714
715 printf("---- old ---\n");
716 crc_update2(&crc, 1, 1); /* CMD_READ */
717 crc_update2(&crc, cmd[0], 8);
718 crc_update2(&crc, cmd[1], 8);
719 printf("crc4 %X \n", reflect(crc_finish(&crc), 4) ) ;
720
721
722 crc_clear(&crc);
723 crc_update2(&crc, 1, 1); /* CMD_READ */
724 crc_update2(&crc, cmd[0], 8);
725 crc_update2(&crc, cmd[1], 8);
726 printf("crc4 %X\n", crc_finish(&crc) ) ;
727 }
728
729 int CmdLegicCalcCrc8(const char *Cmd){
730
731 uint8_t *data = NULL;
732 uint8_t cmdp = 0, uidcrc = 0, type=0;
733 bool errors = false;
734 int len = 0;
735 int bg, en;
736
737 while(param_getchar(Cmd, cmdp) != 0x00) {
738 switch(param_getchar(Cmd, cmdp)) {
739 case 'b':
740 case 'B':
741 // peek at length of the input string so we can
742 // figure out how many elements to malloc in "data"
743 bg=en=0;
744 if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
745 errors = true;
746 break;
747 }
748 len = (en - bg + 1);
749
750 // check that user entered even number of characters
751 // for hex data string
752 if (len & 1) {
753 errors = true;
754 break;
755 }
756
757 // it's possible for user to accidentally enter "b" parameter
758 // more than once - we have to clean previous malloc
759 if (data) free(data);
760 data = malloc(len >> 1);
761 if ( data == NULL ) {
762 PrintAndLog("Can't allocate memory. exiting");
763 errors = true;
764 break;
765 }
766
767 if (param_gethex(Cmd, cmdp+1, data, len)) {
768 errors = true;
769 break;
770 }
771
772 len >>= 1;
773 cmdp += 2;
774 break;
775 case 'u':
776 case 'U':
777 uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
778 cmdp += 2;
779 break;
780 case 'c':
781 case 'C':
782 type = param_get8ex(Cmd, cmdp+1, 0, 10);
783 cmdp += 2;
784 break;
785 case 'h':
786 case 'H':
787 errors = true;
788 break;
789 default:
790 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
791 errors = true;
792 break;
793 }
794 if (errors) break;
795 }
796 //Validations
797 if (errors){
798 if (data) free(data);
799 return usage_legic_calccrc8();
800 }
801
802 switch (type){
803 case 16:
804 PrintAndLog("Legic crc16: %X", CRC16Legic(data, len, uidcrc));
805 break;
806 case 4:
807 calc4(data, 0);
808 break;
809 default:
810 PrintAndLog("Legic crc8: %X", CRC8Legic(data, len) );
811 break;
812 }
813
814 if (data) free(data);
815 return 0;
816 }
817
818 int HFLegicInfo(const char *Cmd, bool verbose) {
819
820 char cmdp = param_getchar(Cmd, 0);
821 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_info();
822
823 UsbCommand c = {CMD_LEGIC_INFO, {0,0,0}};
824 clearCommandBuffer();
825 SendCommand(&c);
826 UsbCommand resp;
827 if (!WaitForResponseTimeout(CMD_ACK, &resp, 500)) {
828 if ( verbose ) PrintAndLog("command execution time out");
829 return 1;
830 }
831
832 uint8_t isOK = resp.arg[0] & 0xFF;
833 if ( !isOK ) {
834 if ( verbose ) PrintAndLog("legic card select failed");
835 return 1;
836 }
837
838 legic_card_select_t card;
839 memcpy(&card, (legic_card_select_t *)resp.d.asBytes, sizeof(legic_card_select_t));
840
841 PrintAndLog(" UID : %s", sprint_hex(card.uid, sizeof(card.uid)));
842 switch(card.cardsize) {
843 case 22:
844 case 256:
845 case 1024:
846 PrintAndLog(" TYPE : MIM%d card (%d bytes)", card.cardsize, card.cardsize); break;
847 default: {
848 PrintAndLog("Unknown card format: %d", card.cardsize);
849 return 1;
850 }
851 }
852 return 0;
853 }
854 int CmdLegicInfo(const char *Cmd){
855 return HFLegicInfo(Cmd, TRUE);
856 }
857
858 static command_t CommandTable[] = {
859 {"help", CmdHelp, 1, "This help"},
860 {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
861 {"read", CmdLegicRFRead, 0, "[offset][length] <iv> -- read bytes from a LEGIC card"},
862 {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
863 {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
864 {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
865 {"write", CmdLegicRfWrite,0, "<offset> <length> <iv> -- Write sample buffer (user after load or read)"},
866 {"writeraw",CmdLegicRfRawWrite, 0, "<address> <value> <iv> -- Write direct to address"},
867 {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
868 {"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
869 {"info", CmdLegicInfo, 1, "Information"},
870 {NULL, NULL, 0, NULL}
871 };
872
873 int CmdHFLegic(const char *Cmd) {
874 clearCommandBuffer();
875 CmdsParse(CommandTable, Cmd);
876 return 0;
877 }
878
879 int CmdHelp(const char *Cmd) {
880 CmdsHelp(CommandTable);
881 return 0;
882 }
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