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ADD: started to add a legic detection to "HF SEARCH"
[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 (ODD and 7bits)");
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 (ODD and 7bits)");
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 (ODD and 7bits)");
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 int usage_legic_info(void){
94 PrintAndLog("Read info from a legic tag.");
95 PrintAndLog("Usage: hf legic info [h]");
96 PrintAndLog("Options:");
97 PrintAndLog(" h : this help");
98 PrintAndLog("");
99 PrintAndLog("Samples:");
100 PrintAndLog(" hf legic info");
101 return 0;
102 }
103 /*
104 * Output BigBuf and deobfuscate LEGIC RF tag data.
105 * This is based on information given in the talk held
106 * by Henryk Ploetz and Karsten Nohl at 26c3
107 */
108 int CmdLegicDecode(const char *Cmd) {
109
110 int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
111 int crc = 0, wrp = 0, wrc = 0;
112 uint8_t stamp_len = 0;
113 uint8_t data_buf[1024]; // receiver buffer
114 char token_type[5] = {0,0,0,0,0};
115 int dcf = 0;
116 int bIsSegmented = 0;
117
118 // copy data from proxmark into buffer
119 GetFromBigBuf(data_buf,sizeof(data_buf),0);
120 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
121 PrintAndLog("Command execute timeout");
122 return 1;
123 }
124
125 // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
126 crc = data_buf[4];
127 uint32_t calc_crc = CRC8Legic(data_buf, 4);
128
129 PrintAndLog("\nCDF: System Area");
130 PrintAndLog("------------------------------------------------------");
131 PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
132 data_buf[0],
133 data_buf[1],
134 data_buf[2],
135 data_buf[3],
136 data_buf[4],
137 (calc_crc == crc) ? "OK":"Fail"
138 );
139
140
141 token_type[0] = 0;
142 dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];
143
144 // New unwritten media?
145 if(dcf == 0xFFFF) {
146
147 PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
148 dcf,
149 data_buf[5],
150 data_buf[6]
151 );
152
153 } else if(dcf > 60000) { // Master token?
154
155 int fl = 0;
156
157 if(data_buf[6] == 0xec) {
158 strncpy(token_type, "XAM", sizeof(token_type));
159 fl = 1;
160 stamp_len = 0x0c - (data_buf[5] >> 4);
161 } else {
162 switch (data_buf[5] & 0x7f) {
163 case 0x00 ... 0x2f:
164 strncpy(token_type, "IAM", sizeof(token_type));
165 fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
166 break;
167 case 0x30 ... 0x6f:
168 strncpy(token_type, "SAM", sizeof(token_type));
169 fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
170 break;
171 case 0x70 ... 0x7f:
172 strncpy(token_type, "GAM", sizeof(token_type));
173 fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
174 break;
175 }
176
177 stamp_len = 0xfc - data_buf[6];
178 }
179
180 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
181 dcf,
182 data_buf[5],
183 data_buf[6],
184 token_type,
185 (data_buf[5] & 0x80 )>> 7,
186 stamp_len,
187 fl
188 );
189
190 } else { // Is IM(-S) type of card...
191
192 if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
193 bIsSegmented = 1;
194 strncpy(token_type, "IM-S", sizeof(token_type));
195 } else {
196 strncpy(token_type, "IM", sizeof(token_type));
197 }
198
199 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
200 dcf,
201 data_buf[5],
202 data_buf[6],
203 token_type,
204 (data_buf[5]&0x80) >> 7
205 );
206 }
207
208 // Makes no sence to show this on blank media...
209 if(dcf != 0xFFFF) {
210
211 if(bIsSegmented) {
212 PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
213 data_buf[7] & 0x0f,
214 (data_buf[7] & 0x70) >> 4,
215 (data_buf[7] & 0x80) >> 7,
216 data_buf[8]
217 );
218 }
219
220 // Header area is only available on IM-S cards, on master tokens this data is the master token data itself
221 if(bIsSegmented || dcf > 60000) {
222 if(dcf > 60000) {
223 PrintAndLog("Master token data");
224 PrintAndLog("%s", sprint_hex(data_buf+8, 14));
225 } else {
226 PrintAndLog("Remaining Header Area");
227 PrintAndLog("%s", sprint_hex(data_buf+9, 13));
228 }
229 }
230 }
231
232 uint8_t segCrcBytes[8] = {0,0,0,0,0,0,0,0};
233 uint32_t segCalcCRC = 0;
234 uint32_t segCRC = 0;
235
236 // Data card?
237 if(dcf <= 60000) {
238
239 PrintAndLog("\nADF: User Area");
240 PrintAndLog("------------------------------------------------------");
241
242 if(bIsSegmented) {
243
244 // Data start point on segmented cards
245 i = 22;
246
247 // decode segments
248 for (segmentNum=1; segmentNum < 128; segmentNum++ )
249 {
250 segment_len = ((data_buf[i+1] ^ crc) & 0x0f) * 256 + (data_buf[i] ^ crc);
251 segment_flag = ((data_buf[i+1] ^ crc) & 0xf0) >> 4;
252 wrp = (data_buf[i+2] ^ crc);
253 wrc = ((data_buf[i+3] ^ crc) & 0x70) >> 4;
254
255 bool hasWRC = (wrc > 0);
256 bool hasWRP = (wrp > wrc);
257 int wrp_len = (wrp - wrc);
258 int remain_seg_payload_len = (segment_len - wrp - 5);
259
260 // validate segment-crc
261 segCrcBytes[0]=data_buf[0]; //uid0
262 segCrcBytes[1]=data_buf[1]; //uid1
263 segCrcBytes[2]=data_buf[2]; //uid2
264 segCrcBytes[3]=data_buf[3]; //uid3
265 segCrcBytes[4]=(data_buf[i] ^ crc); //hdr0
266 segCrcBytes[5]=(data_buf[i+1] ^ crc); //hdr1
267 segCrcBytes[6]=(data_buf[i+2] ^ crc); //hdr2
268 segCrcBytes[7]=(data_buf[i+3] ^ crc); //hdr3
269
270 segCalcCRC = CRC8Legic(segCrcBytes, 8);
271 segCRC = data_buf[i+4] ^ crc;
272
273 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)",
274 segmentNum,
275 data_buf[i] ^ crc,
276 data_buf[i+1] ^ crc,
277 data_buf[i+2] ^ crc,
278 data_buf[i+3] ^ crc,
279 segment_len,
280 segment_flag,
281 (segment_flag & 0x4) >> 2,
282 (segment_flag & 0x8) >> 3,
283 wrp,
284 wrc,
285 ((data_buf[i+3]^crc) & 0x80) >> 7,
286 segCRC,
287 ( segCRC == segCalcCRC ) ? "OK" : "fail"
288 );
289
290 i += 5;
291
292 if ( hasWRC ) {
293 PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
294 PrintAndLog("\nrow | data");
295 PrintAndLog("-----+------------------------------------------------");
296
297 for ( k=i; k < (i + wrc); ++k)
298 data_buf[k] ^= crc;
299
300 print_hex_break( data_buf+i, wrc, 16);
301
302 i += wrc;
303 }
304
305 if ( hasWRP ) {
306 PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
307 PrintAndLog("\nrow | data");
308 PrintAndLog("-----+------------------------------------------------");
309
310 for (k=i; k < (i+wrp_len); ++k)
311 data_buf[k] ^= crc;
312
313 print_hex_break( data_buf+i, wrp_len, 16);
314
315 i += wrp_len;
316
317 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
318 if( wrp_len == 8 )
319 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
320 }
321
322 PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
323 PrintAndLog("\nrow | data");
324 PrintAndLog("-----+------------------------------------------------");
325
326 for ( k=i; k < (i+remain_seg_payload_len); ++k)
327 data_buf[k] ^= crc;
328
329 print_hex_break( data_buf+i, remain_seg_payload_len, 16);
330
331 i += remain_seg_payload_len;
332
333 PrintAndLog("-----+------------------------------------------------\n");
334
335 // end with last segment
336 if (segment_flag & 0x8) return 0;
337
338 } // end for loop
339
340 } else {
341
342 // Data start point on unsegmented cards
343 i = 8;
344
345 wrp = data_buf[7] & 0x0F;
346 wrc = (data_buf[7] & 0x70) >> 4;
347
348 bool hasWRC = (wrc > 0);
349 bool hasWRP = (wrp > wrc);
350 int wrp_len = (wrp - wrc);
351 int remain_seg_payload_len = (1024 - 22 - wrp); // Any chance to get physical card size here!?
352
353 PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
354 wrp,
355 wrc,
356 (data_buf[7] & 0x80) >> 7
357 );
358
359 if ( hasWRC ) {
360 PrintAndLog("WRC protected area: (I %d | WRC %d)", i, wrc);
361 PrintAndLog("\nrow | data");
362 PrintAndLog("-----+------------------------------------------------");
363 print_hex_break( data_buf+i, wrc, 16);
364 i += wrc;
365 }
366
367 if ( hasWRP ) {
368 PrintAndLog("Remaining write protected area: (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
369 PrintAndLog("\nrow | data");
370 PrintAndLog("-----+------------------------------------------------");
371 print_hex_break( data_buf + i, wrp_len, 16);
372 i += wrp_len;
373
374 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
375 if( wrp_len == 8 )
376 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4], data_buf[i-3], data_buf[i-2]);
377 }
378
379 PrintAndLog("Remaining segment payload: (I %d | Remain LEN %d)", i, remain_seg_payload_len);
380 PrintAndLog("\nrow | data");
381 PrintAndLog("-----+------------------------------------------------");
382 print_hex_break( data_buf + i, remain_seg_payload_len, 16);
383 i += remain_seg_payload_len;
384
385 PrintAndLog("-----+------------------------------------------------\n");
386 }
387 }
388 return 0;
389 }
390
391 int CmdLegicRFRead(const char *Cmd) {
392
393 // params:
394 // offset in data
395 // number of bytes.
396 char cmdp = param_getchar(Cmd, 0);
397 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
398
399 uint32_t offset = 0, len = 0, IV = 1;
400 sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
401
402 // OUT-OF-BOUNDS check
403 if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
404
405 if ( (IV & 0x7F) != IV ){
406 IV &= 0x7F;
407 PrintAndLog("Truncating IV to 7bits");
408 }
409 if ( (IV & 1) == 0 ){
410 IV |= 0x01; // IV must be odd
411 PrintAndLog("LSB of IV must be SET");
412 }
413 PrintAndLog("Current IV: 0x%02x", IV);
414
415 // get some prng bytes from
416 uint8_t temp[32];
417 legic_prng_init(IV);
418 for ( uint8_t j = 0; j < sizeof(temp); ++j) {
419 temp[j] = legic_prng_get_bit(1);
420 legic_prng_forward(1);
421 //PrintAndLog("PRNG: %s", sprint_hex(temp, sizeof(temp)));
422 }
423 PrintAndLog("PRNG: %s", sprint_bin(temp, sizeof(temp)));
424
425 UsbCommand c = {CMD_READER_LEGIC_RF, {offset, len, IV}};
426 clearCommandBuffer();
427 SendCommand(&c);
428 UsbCommand resp;
429 if (WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
430 uint8_t isOK = resp.arg[0] & 0xFF;
431 uint16_t len = resp.arg[1] & 0x3FF;
432 if ( isOK ) {
433 PrintAndLog("use 'hf legic decode'");
434 }
435 uint8_t *data = resp.d.asBytes;
436 PrintAndLog("\nData |");
437 PrintAndLog("-----------------------------");
438 PrintAndLog(" %s|\n", sprint_hex(data, len));
439 // }
440 } else {
441 PrintAndLog("command execution time out");
442 return 1;
443 }
444 return 0;
445 }
446
447 int CmdLegicLoad(const char *Cmd) {
448
449 // iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :)
450 char cmdp = param_getchar(Cmd, 0);
451 if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
452
453 char filename[FILE_PATH_SIZE] = {0x00};
454 int len = strlen(Cmd);
455
456 if (len > FILE_PATH_SIZE) {
457 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
458 return 0;
459 }
460 memcpy(filename, Cmd, len);
461
462 FILE *f = fopen(filename, "r");
463 if(!f) {
464 PrintAndLog("couldn't open '%s'", Cmd);
465 return -1;
466 }
467
468 char line[80];
469 int offset = 0;
470 uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
471 int index = 0;
472 int totalbytes = 0;
473 while ( fgets(line, sizeof(line), f) ) {
474 int res = sscanf(line, "%x %x %x %x %x %x %x %x",
475 (unsigned int *)&data[index],
476 (unsigned int *)&data[index + 1],
477 (unsigned int *)&data[index + 2],
478 (unsigned int *)&data[index + 3],
479 (unsigned int *)&data[index + 4],
480 (unsigned int *)&data[index + 5],
481 (unsigned int *)&data[index + 6],
482 (unsigned int *)&data[index + 7]);
483
484 if(res != 8) {
485 PrintAndLog("Error: could not read samples");
486 fclose(f);
487 return -1;
488 }
489 index += res;
490
491 if ( index == USB_CMD_DATA_SIZE ){
492 // PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
493 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
494 memcpy(c.d.asBytes, data, sizeof(data));
495 clearCommandBuffer();
496 SendCommand(&c);
497 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
498 PrintAndLog("Command execute timeout");
499 fclose(f);
500 return 1;
501 }
502 offset += index;
503 totalbytes += index;
504 index = 0;
505 }
506 }
507 fclose(f);
508
509 // left over bytes?
510 if ( index != 0 ) {
511 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
512 memcpy(c.d.asBytes, data, 8);
513 clearCommandBuffer();
514 SendCommand(&c);
515 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
516 PrintAndLog("Command execute timeout");
517 return 1;
518 }
519 totalbytes += index;
520 }
521
522 PrintAndLog("loaded %u samples", totalbytes);
523 return 0;
524 }
525
526 int CmdLegicSave(const char *Cmd) {
527 int requested = 1024;
528 int offset = 0;
529 int delivered = 0;
530 char filename[FILE_PATH_SIZE] = {0x00};
531 uint8_t got[1024] = {0x00};
532
533 memset(filename, 0, FILE_PATH_SIZE);
534
535 sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
536
537 /* If no length given save entire legic read buffer */
538 /* round up to nearest 8 bytes so the saved data can be used with legicload */
539 if (requested == 0)
540 requested = 1024;
541
542 if (requested % 8 != 0) {
543 int remainder = requested % 8;
544 requested = requested + 8 - remainder;
545 }
546
547 if (offset + requested > sizeof(got)) {
548 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
549 return 0;
550 }
551
552 GetFromBigBuf(got, requested, offset);
553 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
554 PrintAndLog("Command execute timeout");
555 return 1;
556 }
557
558 FILE *f = fopen(filename, "w");
559 if(!f) {
560 PrintAndLog("couldn't open '%s'", Cmd+1);
561 return -1;
562 }
563
564 for (int j = 0; j < requested; j += 8) {
565 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
566 got[j+0], got[j+1], got[j+2], got[j+3],
567 got[j+4], got[j+5], got[j+6], got[j+7]
568 );
569 delivered += 8;
570 if (delivered >= requested) break;
571 }
572
573 fclose(f);
574 PrintAndLog("saved %u samples", delivered);
575 return 0;
576 }
577
578 //TODO: write a help text (iceman)
579 int CmdLegicRfSim(const char *Cmd) {
580 UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
581 sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
582 clearCommandBuffer();
583 SendCommand(&c);
584 return 0;
585 }
586
587 int CmdLegicRfWrite(const char *Cmd) {
588
589 // params:
590 // offset - in tag memory
591 // length - num of bytes to be written
592 // IV - initialisation vector
593
594 char cmdp = param_getchar(Cmd, 0);
595 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_write();
596
597 uint32_t offset = 0, len = 0, IV = 0;
598
599 UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}};
600 int res = sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
601 if(res < 2) {
602 PrintAndLog("Please specify the offset and length as two hex strings and, optionally, the IV also as an hex string");
603 return -1;
604 }
605
606 // OUT-OF-BOUNDS check
607 if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
608
609 if ( (IV & 0x7F) != IV ){
610 IV &= 0x7F;
611 PrintAndLog("Truncating IV to 7bits");
612 }
613 if ( (IV & 1) == 0 ){
614 IV |= 0x01; // IV must be odd
615 PrintAndLog("LSB of IV must be SET");
616 }
617
618 PrintAndLog("Current IV: 0x%02x", IV);
619
620 c.arg[0] = offset;
621 c.arg[1] = len;
622 c.arg[2] = IV;
623
624 clearCommandBuffer();
625 SendCommand(&c);
626 return 0;
627 }
628
629 int CmdLegicRfRawWrite(const char *Cmd) {
630
631 char cmdp = param_getchar(Cmd, 0);
632 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_rawwrite();
633
634 uint32_t address = 0, data = 0, IV = 0;
635 char answer;
636
637 UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
638 int res = sscanf(Cmd, "%x %x %x", &address, &data, &IV);
639 if(res < 2)
640 return usage_legic_rawwrite();
641
642 // OUT-OF-BOUNDS check
643 if(address > MAX_LENGTH)
644 return usage_legic_rawwrite();
645
646 if ( (IV & 0x7F) != IV ){
647 IV &= 0x7F;
648 PrintAndLog("Truncating IV to 7bits");
649 }
650 if ( (IV & 1) == 0 ){
651 IV |= 0x01; // IV must be odd
652 PrintAndLog("LSB of IV must be SET");
653 }
654 PrintAndLog("Current IV: 0x%02x", IV);
655
656 c.arg[0] = address;
657 c.arg[1] = data;
658 c.arg[2] = IV;
659
660 if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
661 PrintAndLog("############# DANGER !! #############");
662 PrintAndLog("# changing the DCF is irreversible #");
663 PrintAndLog("#####################################");
664 PrintAndLog("do youe really want to continue? y(es) n(o)");
665 if (scanf(" %c", &answer) > 0 && (answer == 'y' || answer == 'Y')) {
666 SendCommand(&c);
667 return 0;
668 }
669 return -1;
670 }
671
672 clearCommandBuffer();
673 SendCommand(&c);
674 return 0;
675 }
676
677 //TODO: write a help text (iceman)
678 int CmdLegicRfFill(const char *Cmd) {
679 UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
680 int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
681 if(res != 3) {
682 PrintAndLog("Please specify the offset, length and value as two hex strings");
683 return -1;
684 }
685
686 int i;
687 UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
688 memset(c.d.asBytes, cmd.arg[2], 48);
689
690 for(i = 0; i < 22; i++) {
691 c.arg[0] = i*48;
692
693 clearCommandBuffer();
694 SendCommand(&c);
695 WaitForResponse(CMD_ACK, NULL);
696 }
697 clearCommandBuffer();
698 SendCommand(&cmd);
699 return 0;
700 }
701
702 void static calc4(uint8_t *cmd, uint8_t len){
703 crc_t crc;
704 //crc_init_ref(&crc, 4, 0x19 >> 1, 0x5, 0, TRUE, TRUE);
705 crc_init(&crc, 4, 0x19 >> 1, 0x5, 0);
706
707 crc_clear(&crc);
708 crc_update(&crc, 1, 1); /* CMD_READ */
709 crc_update(&crc, cmd[0], 8);
710 crc_update(&crc, cmd[1], 8);
711 printf("crc4 %X\n", reflect(crc_finish(&crc), 4) ) ;
712
713 crc_clear(&crc);
714 crc_update(&crc, 1, 1); /* CMD_READ */
715 crc_update(&crc, cmd[0], 8);
716 crc_update(&crc, cmd[1], 8);
717 printf("crc4 %X\n", crc_finish(&crc) ) ;
718
719 printf("---- old ---\n");
720 crc_update2(&crc, 1, 1); /* CMD_READ */
721 crc_update2(&crc, cmd[0], 8);
722 crc_update2(&crc, cmd[1], 8);
723 printf("crc4 %X \n", reflect(crc_finish(&crc), 4) ) ;
724
725
726 crc_clear(&crc);
727 crc_update2(&crc, 1, 1); /* CMD_READ */
728 crc_update2(&crc, cmd[0], 8);
729 crc_update2(&crc, cmd[1], 8);
730 printf("crc4 %X\n", crc_finish(&crc) ) ;
731 }
732
733 int CmdLegicCalcCrc8(const char *Cmd){
734
735 uint8_t *data = NULL;
736 uint8_t cmdp = 0, uidcrc = 0, type=0;
737 bool errors = false;
738 int len = 0;
739 int bg, en;
740
741 while(param_getchar(Cmd, cmdp) != 0x00) {
742 switch(param_getchar(Cmd, cmdp)) {
743 case 'b':
744 case 'B':
745 // peek at length of the input string so we can
746 // figure out how many elements to malloc in "data"
747 bg=en=0;
748 if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
749 errors = true;
750 break;
751 }
752 len = (en - bg + 1);
753
754 // check that user entered even number of characters
755 // for hex data string
756 if (len & 1) {
757 errors = true;
758 break;
759 }
760
761 // it's possible for user to accidentally enter "b" parameter
762 // more than once - we have to clean previous malloc
763 if (data) free(data);
764 data = malloc(len >> 1);
765 if ( data == NULL ) {
766 PrintAndLog("Can't allocate memory. exiting");
767 errors = true;
768 break;
769 }
770
771 if (param_gethex(Cmd, cmdp+1, data, len)) {
772 errors = true;
773 break;
774 }
775
776 len >>= 1;
777 cmdp += 2;
778 break;
779 case 'u':
780 case 'U':
781 uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
782 cmdp += 2;
783 break;
784 case 'c':
785 case 'C':
786 type = param_get8ex(Cmd, cmdp+1, 0, 10);
787 cmdp += 2;
788 break;
789 case 'h':
790 case 'H':
791 errors = true;
792 break;
793 default:
794 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
795 errors = true;
796 break;
797 }
798 if (errors) break;
799 }
800 //Validations
801 if (errors){
802 if (data) free(data);
803 return usage_legic_calccrc8();
804 }
805
806 switch (type){
807 case 16:
808 PrintAndLog("Legic crc16: %X", CRC16Legic(data, len, uidcrc));
809 break;
810 case 4:
811 calc4(data, 0);
812 break;
813 default:
814 PrintAndLog("Legic crc8: %X", CRC8Legic(data, len) );
815 break;
816 }
817
818 if (data) free(data);
819 return 0;
820 }
821
822 int HFLegicInfo(const char *Cmd, bool verbose) {
823
824 char cmdp = param_getchar(Cmd, 0);
825 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_info();
826
827 UsbCommand c = {CMD_LEGIC_INFO, {0,0,0}};
828 clearCommandBuffer();
829 SendCommand(&c);
830 UsbCommand resp;
831 if (WaitForResponseTimeout(CMD_ACK, &resp, 1000)) {
832 uint8_t isOK = resp.arg[0] & 0xFF;
833 uint16_t tagtype = resp.arg[1] & 0xFFF;
834 if ( isOK ) {
835 PrintAndLog(" UID : %s", sprint_hex(resp.d.asBytes, 4));
836 switch(tagtype) {
837 case 22: PrintAndLog("MIM22 card (22bytes)"); break;
838 case 256: PrintAndLog("MIM256 card (256bytes)"); break;
839 case 1024: PrintAndLog("MIM1024 card (1024bytes)"); break;
840 default: {
841 PrintAndLog("Unknown card format: %x", tagtype);
842 return 1;
843 }
844 }
845 } else {
846 PrintAndLog("legic card select failed");
847 return 1;
848 }
849 } else {
850 PrintAndLog("command execution time out");
851 return 1;
852 }
853 return 0;
854 }
855 int CmdLegicInfo(const char *Cmd){
856 return HFLegicInfo(Cmd, TRUE);
857 }
858
859 static command_t CommandTable[] = {
860 {"help", CmdHelp, 1, "This help"},
861 {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
862 {"read", CmdLegicRFRead, 0, "[offset][length] <iv> -- read bytes from a LEGIC card"},
863 {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
864 {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
865 {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
866 {"write", CmdLegicRfWrite,0, "<offset> <length> <iv> -- Write sample buffer (user after load or read)"},
867 {"writeraw",CmdLegicRfRawWrite, 0, "<address> <value> <iv> -- Write direct to address"},
868 {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
869 {"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
870 {"info", CmdLegicInfo, 1, "Information"},
871 {NULL, NULL, 0, NULL}
872 };
873
874 int CmdHFLegic(const char *Cmd) {
875 clearCommandBuffer();
876 CmdsParse(CommandTable, Cmd);
877 return 0;
878 }
879
880 int CmdHelp(const char *Cmd) {
881 CmdsHelp(CommandTable);
882 return 0;
883 }
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