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