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FIX: Forget that the prng was 0x8000 length and not 0xFFFF. Sorry. Also returned...
[proxmark3-svn] / client / cmdhflegic.c
CommitLineData
a553f267 1//-----------------------------------------------------------------------------
2// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
3//
4// This code is licensed to you under the terms of the GNU GPL, version 2 or,
5// at your option, any later version. See the LICENSE.txt file for the text of
6// the license.
7//-----------------------------------------------------------------------------
8// High frequency Legic commands
9//-----------------------------------------------------------------------------
7fe9b0b7 10#include "cmdhflegic.h"
3e134b4c 11
7fe9b0b7 12static int CmdHelp(const char *Cmd);
13
ffa306de 14#define SESSION_IV 0x55
15#define MAX_LENGTH 1024
16
3b920280 17int usage_legic_calccrc8(void){
3e134b4c 18 PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
3b920280 19 PrintAndLog("There must be an even number of hexsymbols as input.");
514ddaa2 20 PrintAndLog("Usage: hf legic crc8 [h] b <hexbytes> u <uidcrc> c <crc type>");
21 PrintAndLog("Options:");
ffa306de 22 PrintAndLog(" h : this help");
3e134b4c 23 PrintAndLog(" b <hexbytes> : hex bytes");
24 PrintAndLog(" u <uidcrc> : MCC hexbyte");
514ddaa2 25 PrintAndLog(" c <crc type> : 8|16 bit crc size");
3b920280 26 PrintAndLog("");
514ddaa2 27 PrintAndLog("Samples:");
3e134b4c 28 PrintAndLog(" hf legic crc8 b deadbeef1122");
514ddaa2 29 PrintAndLog(" hf legic crc8 b deadbeef1122 u 9A c 16");
3b920280 30 return 0;
31}
e579e768 32int usage_legic_load(void){
33 PrintAndLog("It loads datasamples from the file `filename` to device memory");
ffa306de 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");
514ddaa2 38 PrintAndLog("");
39 PrintAndLog("Samples:");
40 PrintAndLog(" hf legic load filename");
e579e768 41 return 0;
42}
cbdcc89a 43int usage_legic_read(void){
44 PrintAndLog("Read data from a legic tag.");
ffa306de 45 PrintAndLog("Usage: hf legic read [h] <offset> <length> <IV>");
514ddaa2 46 PrintAndLog("Options:");
ffa306de 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");
cbdcc89a 51 PrintAndLog("");
514ddaa2 52 PrintAndLog("Samples:");
53 PrintAndLog(" hf legic read");
ffa306de 54 PrintAndLog(" hf legic read 10 4");
cbdcc89a 55 return 0;
56}
e8fecd72 57int usage_legic_sim(void){
ffa306de 58 PrintAndLog("Missing help text.");
59 return 0;
60}
61int 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");
e8fecd72 73 return 0;
74}
75int usage_legic_rawwrite(void){
ffa306de 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");
e8fecd72 87 return 0;
88}
89int usage_legic_fill(void){
ffa306de 90 PrintAndLog("Missing help text.");
e8fecd72 91 return 0;
92}
93
669c1b80 94/*
95 * Output BigBuf and deobfuscate LEGIC RF tag data.
cbdcc89a 96 * This is based on information given in the talk held
669c1b80 97 * by Henryk Ploetz and Karsten Nohl at 26c3
669c1b80 98 */
3b920280 99int CmdLegicDecode(const char *Cmd) {
e8fecd72 100
101 int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
102 int crc = 0, wrp = 0, wrc = 0;
60bb5ef7 103 uint8_t stamp_len = 0;
e8fecd72 104 uint8_t data_buf[1052]; // receiver buffer
105 char token_type[5] = {0,0,0,0,0};
106 int dcf = 0;
3e134b4c 107 int bIsSegmented = 0;
52cf34c1 108
cbdcc89a 109 // download EML memory, where the "legic read" command puts the data.
110 GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
f7f844d0 111 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
112 PrintAndLog("Command execute timeout");
113 return 1;
114 }
115
52cf34c1 116 // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
3b920280 117 crc = data_buf[4];
118 uint32_t calc_crc = CRC8Legic(data_buf, 4);
119
52cf34c1 120 PrintAndLog("\nCDF: System Area");
aacb96d7 121 PrintAndLog("------------------------------------------------------");
3b920280 122 PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
52cf34c1 123 data_buf[0],
124 data_buf[1],
125 data_buf[2],
126 data_buf[3],
3b920280 127 data_buf[4],
e579e768 128 (calc_crc == crc) ? "OK":"Fail"
52cf34c1 129 );
669c1b80 130
3e134b4c 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 {
e8fecd72 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 }
52cf34c1 167
e8fecd72 168 stamp_len = 0xfc - data_buf[6];
3e134b4c 169 }
52cf34c1 170
3e134b4c 171 PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
172 dcf,
e8fecd72 173 data_buf[5],
174 data_buf[6],
175 token_type,
176 (data_buf[5] & 0x80 )>> 7,
3e134b4c 177 stamp_len,
178 fl
e8fecd72 179 );
52cf34c1 180
e8fecd72 181 } else { // Is IM(-S) type of card...
3e134b4c 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,
e8fecd72 195 (data_buf[5]&0x80) >> 7
3e134b4c 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",
e8fecd72 204 data_buf[7] & 0x0f,
205 (data_buf[7] & 0x70) >> 4,
206 (data_buf[7] & 0x80) >> 7,
207 data_buf[8]
208 );
3e134b4c 209 }
52cf34c1 210
3e134b4c 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 {
e8fecd72 217 PrintAndLog("Remaining Header Area");
218 PrintAndLog("%s", sprint_hex(data_buf+9, 13));
3e134b4c 219 }
220 }
221 }
d7fd9084 222
e8fecd72 223 uint8_t segCrcBytes[8] = {0,0,0,0,0,0,0,0};
e579e768 224 uint32_t segCalcCRC = 0;
225 uint32_t segCRC = 0;
d7fd9084 226
3e134b4c 227 // Data card?
228 if(dcf <= 60000) {
cbdcc89a 229
e8fecd72 230 PrintAndLog("\nADF: User Area");
231 PrintAndLog("------------------------------------------------------");
3e134b4c 232
233 if(bIsSegmented) {
234
235 // Data start point on segmented cards
e8fecd72 236 i = 22;
3e134b4c 237
238 // decode segments
239 for (segmentNum=1; segmentNum < 128; segmentNum++ )
240 {
26778ea7 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;
e8fecd72 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);
e579e768 250
e8fecd72 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
26778ea7 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
e8fecd72 260
261 segCalcCRC = CRC8Legic(segCrcBytes, 8);
26778ea7 262 segCRC = data_buf[i+4] ^ crc;
e8fecd72 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,
26778ea7 266 data_buf[i] ^ crc,
267 data_buf[i+1] ^ crc,
268 data_buf[i+2] ^ crc,
269 data_buf[i+3] ^ crc,
e8fecd72 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;
669c1b80 282
e8fecd72 283 if ( hasWRC ) {
284 PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
285 PrintAndLog("\nrow | data");
286 PrintAndLog("-----+------------------------------------------------");
3e134b4c 287
26778ea7 288 for ( k=i; k < (i + wrc); ++k)
e8fecd72 289 data_buf[k] ^= crc;
3e134b4c 290
e8fecd72 291 print_hex_break( data_buf+i, wrc, 16);
3b920280 292
e8fecd72 293 i += wrc;
294 }
669c1b80 295
e8fecd72 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("-----+------------------------------------------------");
d7fd9084 300
3e134b4c 301 for (k=i; k < (i+wrp_len); ++k)
e8fecd72 302 data_buf[k] ^= crc;
3b920280 303
e8fecd72 304 print_hex_break( data_buf+i, wrp_len, 16);
3b920280 305
e8fecd72 306 i += wrp_len;
d7fd9084 307
3e134b4c 308 // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
e8fecd72 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 }
669c1b80 312
e8fecd72 313 PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
314 PrintAndLog("\nrow | data");
315 PrintAndLog("-----+------------------------------------------------");
3e134b4c 316
317 for ( k=i; k < (i+remain_seg_payload_len); ++k)
e8fecd72 318 data_buf[k] ^= crc;
3b920280 319
e8fecd72 320 print_hex_break( data_buf+i, remain_seg_payload_len, 16);
669c1b80 321
e8fecd72 322 i += remain_seg_payload_len;
d7fd9084 323
e8fecd72 324 PrintAndLog("-----+------------------------------------------------\n");
a182a680 325
e8fecd72 326 // end with last segment
327 if (segment_flag & 0x8) return 0;
52cf34c1 328
e8fecd72 329 } // end for loop
3e134b4c 330
331 } else {
332
333 // Data start point on unsegmented cards
334 i = 8;
335
e8fecd72 336 wrp = data_buf[7] & 0x0F;
26778ea7 337 wrc = (data_buf[7] & 0x70) >> 4;
3e134b4c 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("-----+------------------------------------------------");
e8fecd72 362 print_hex_break( data_buf + i, wrp_len, 16);
3e134b4c 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("-----+------------------------------------------------");
e8fecd72 373 print_hex_break( data_buf + i, remain_seg_payload_len, 16);
3e134b4c 374 i += remain_seg_payload_len;
375
376 PrintAndLog("-----+------------------------------------------------\n");
377 }
378 }
52cf34c1 379 return 0;
669c1b80 380}
41dab153 381
52cf34c1 382int CmdLegicRFRead(const char *Cmd) {
ffa306de 383
cbdcc89a 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
ffa306de 390 uint32_t offset = 0, len = 0, IV = 0;
391 sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
52cf34c1 392
ffa306de 393 // OUT-OF-BOUNDS check
394 if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
395
396 IV &= 0x7F;
397 PrintAndLog("Current IV: 0x%02x", IV);
398
399 UsbCommand c= {CMD_READER_LEGIC_RF, {offset, len, IV}};
52cf34c1 400 clearCommandBuffer();
401 SendCommand(&c);
402 return 0;
41dab153 403}
3612a8a8 404
52cf34c1 405int CmdLegicLoad(const char *Cmd) {
e8fecd72 406
407// iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :)
52cf34c1 408 char cmdp = param_getchar(Cmd, 0);
e579e768 409 if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
b915fda3 410
e579e768 411 char filename[FILE_PATH_SIZE] = {0x00};
412 int len = strlen(Cmd);
413
b915fda3 414 if (len > FILE_PATH_SIZE) {
415 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
416 return 0;
417 }
418 memcpy(filename, Cmd, len);
419
420 FILE *f = fopen(filename, "r");
3612a8a8 421 if(!f) {
422 PrintAndLog("couldn't open '%s'", Cmd);
423 return -1;
424 }
52cf34c1 425
426 char line[80];
810f5379 427 int offset = 0;
c6e0a2eb 428 uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
429 int index = 0;
430 int totalbytes = 0;
52cf34c1 431 while ( fgets(line, sizeof(line), f) ) {
3612a8a8 432 int res = sscanf(line, "%x %x %x %x %x %x %x %x",
c6e0a2eb 433 (unsigned int *)&data[index],
434 (unsigned int *)&data[index + 1],
435 (unsigned int *)&data[index + 2],
436 (unsigned int *)&data[index + 3],
437 (unsigned int *)&data[index + 4],
438 (unsigned int *)&data[index + 5],
439 (unsigned int *)&data[index + 6],
440 (unsigned int *)&data[index + 7]);
e7d099dc 441
3612a8a8 442 if(res != 8) {
443 PrintAndLog("Error: could not read samples");
444 fclose(f);
445 return -1;
446 }
c6e0a2eb 447 index += res;
448
449 if ( index == USB_CMD_DATA_SIZE ){
450// PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
451 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
452 memcpy(c.d.asBytes, data, sizeof(data));
453 clearCommandBuffer();
454 SendCommand(&c);
d7fd9084 455 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
456 PrintAndLog("Command execute timeout");
457 fclose(f);
458 return 1;
459 }
c6e0a2eb 460 offset += index;
461 totalbytes += index;
462 index = 0;
463 }
3612a8a8 464 }
465 fclose(f);
c6e0a2eb 466
467 // left over bytes?
468 if ( index != 0 ) {
469 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
470 memcpy(c.d.asBytes, data, 8);
471 clearCommandBuffer();
472 SendCommand(&c);
d7fd9084 473 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
474 PrintAndLog("Command execute timeout");
475 return 1;
476 }
c6e0a2eb 477 totalbytes += index;
478 }
479
480 PrintAndLog("loaded %u samples", totalbytes);
3612a8a8 481 return 0;
482}
483
52cf34c1 484int CmdLegicSave(const char *Cmd) {
485 int requested = 1024;
486 int offset = 0;
487 int delivered = 0;
e8fecd72 488 char filename[FILE_PATH_SIZE] = {0x00};
52cf34c1 489 uint8_t got[1024] = {0x00};
490
e8fecd72 491 memset(filename, 0, FILE_PATH_SIZE);
492
52cf34c1 493 sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
494
495 /* If no length given save entire legic read buffer */
496 /* round up to nearest 8 bytes so the saved data can be used with legicload */
e7d099dc 497 if (requested == 0)
52cf34c1 498 requested = 1024;
52cf34c1 499
500 if (requested % 8 != 0) {
501 int remainder = requested % 8;
502 requested = requested + 8 - remainder;
503 }
504
505 if (offset + requested > sizeof(got)) {
506 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
507 return 0;
508 }
509
d7fd9084 510 GetFromBigBuf(got, requested, offset);
f7f844d0 511 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
aacb96d7 512 PrintAndLog("Command execute timeout");
f7f844d0 513 return 1;
514 }
52cf34c1 515
aacb96d7 516 FILE *f = fopen(filename, "w");
517 if(!f) {
518 PrintAndLog("couldn't open '%s'", Cmd+1);
519 return -1;
520 }
521
52cf34c1 522 for (int j = 0; j < requested; j += 8) {
523 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
c6e0a2eb 524 got[j+0], got[j+1], got[j+2], got[j+3],
525 got[j+4], got[j+5], got[j+6], got[j+7]
52cf34c1 526 );
527 delivered += 8;
528 if (delivered >= requested) break;
529 }
530
531 fclose(f);
532 PrintAndLog("saved %u samples", delivered);
533 return 0;
3612a8a8 534}
535
f7f844d0 536//TODO: write a help text (iceman)
52cf34c1 537int CmdLegicRfSim(const char *Cmd) {
3b920280 538 UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
52cf34c1 539 sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
540 clearCommandBuffer();
541 SendCommand(&c);
542 return 0;
3612a8a8 543}
544
52cf34c1 545int CmdLegicRfWrite(const char *Cmd) {
ffa306de 546
547 // params:
548 // offset - in tag memory
549 // length - num of bytes to be written
550 // IV - initialisation vector
551
552 char cmdp = param_getchar(Cmd, 0);
553 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_write();
554
555 uint32_t offset = 0, len = 0, IV = SESSION_IV;
556
e8fecd72 557 UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}};
ffa306de 558 int res = sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
559 if(res < 2) {
560 PrintAndLog("Please specify the offset and length as two hex strings and, optionally, the IV also as an hex string");
3612a8a8 561 return -1;
562 }
ffa306de 563
564 // OUT-OF-BOUNDS check
565 if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
566
567
568 IV &= 0x7F;
569 PrintAndLog("Current IV: 0x%02x", IV);
570
571 c.arg[0] = offset;
572 c.arg[1] = len;
573 c.arg[2] = IV;
574
52cf34c1 575 clearCommandBuffer();
3612a8a8 576 SendCommand(&c);
577 return 0;
578}
579
3e134b4c 580int CmdLegicRfRawWrite(const char *Cmd) {
ffa306de 581
582 char cmdp = param_getchar(Cmd, 0);
583 if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_rawwrite();
584
585 uint32_t address = 0, data = 0, IV = SESSION_IV;
3e134b4c 586 char answer;
ffa306de 587
3e134b4c 588 UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
ffa306de 589 int res = sscanf(Cmd, "%x %x %x", &address, &data, &IV);
590 if(res < 2)
591 return usage_legic_rawwrite();
592
593 // OUT-OF-BOUNDS check
594 if(address > MAX_LENGTH)
595 return usage_legic_rawwrite();
596
597 IV &= 0x7F;
598 PrintAndLog("Current IV: 0x%02x", IV);
599
600 c.arg[0] = address;
601 c.arg[1] = data;
602 c.arg[2] = IV;
3e134b4c 603
604 if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
605 PrintAndLog("############# DANGER !! #############");
606 PrintAndLog("# changing the DCF is irreversible #");
607 PrintAndLog("#####################################");
608 PrintAndLog("do youe really want to continue? y(es) n(o)");
6e321dd8 609 if (scanf(" %c", &answer) > 0 && (answer == 'y' || answer == 'Y')) {
3e134b4c 610 SendCommand(&c);
611 return 0;
612 }
613 return -1;
614 }
615
616 clearCommandBuffer();
617 SendCommand(&c);
618 return 0;
619}
620
621//TODO: write a help text (iceman)
52cf34c1 622int CmdLegicRfFill(const char *Cmd) {
3e134b4c 623 UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
1a07fd51 624 int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
3612a8a8 625 if(res != 3) {
626 PrintAndLog("Please specify the offset, length and value as two hex strings");
627 return -1;
628 }
629
630 int i;
52cf34c1 631 UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
ba4ad25b 632 memset(c.d.asBytes, cmd.arg[2], 48);
3e134b4c 633
52cf34c1 634 for(i = 0; i < 22; i++) {
635 c.arg[0] = i*48;
3e134b4c 636
637 clearCommandBuffer();
52cf34c1 638 SendCommand(&c);
3e134b4c 639 WaitForResponse(CMD_ACK, NULL);
52cf34c1 640 }
641 clearCommandBuffer();
3612a8a8 642 SendCommand(&cmd);
643 return 0;
644 }
645
3b920280 646int CmdLegicCalcCrc8(const char *Cmd){
647
cc4c8fd6 648 uint8_t *data = NULL;
3e134b4c 649 uint8_t cmdp = 0, uidcrc = 0, type=0;
650 bool errors = false;
651 int len = 0;
e31a0f73 652 int bg, en;
3b920280 653
3e134b4c 654 while(param_getchar(Cmd, cmdp) != 0x00) {
655 switch(param_getchar(Cmd, cmdp)) {
656 case 'b':
657 case 'B':
e31a0f73
AG		 658 // peek at length of the input string so we can
659 // figure out how many elements to malloc in "data"
660 bg=en=0;
987c5984
AG		 661 if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
662 errors = true;
663 break;
664 }
e31a0f73
AG		 665 len = (en - bg + 1);
666
667 // check that user entered even number of characters
668 // for hex data string
669 if (len & 1) {
670 errors = true;
671 break;
672 }
673
08927081
AG		 674 // it's possible for user to accidentally enter "b" parameter
675 // more than once - we have to clean previous malloc
676 if (data) free(data);
e31a0f73 677 data = malloc(len >> 1);
3e134b4c 678 if ( data == NULL ) {
679 PrintAndLog("Can't allocate memory. exiting");
680 errors = true;
681 break;
e31a0f73
AG		 682 }
683
987c5984
AG		 684 if (param_gethex(Cmd, cmdp+1, data, len)) {
685 errors = true;
686 break;
687 }
3e134b4c 688
689 len >>= 1;
690 cmdp += 2;
691 break;
692 case 'u':
693 case 'U':
694 uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
695 cmdp += 2;
696 break;
697 case 'c':
698 case 'C':
699 type = param_get8ex(Cmd, cmdp+1, 0, 10);
700 cmdp += 2;
701 break;
702 case 'h':
703 case 'H':
704 errors = true;
705 break;
706 default:
707 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
708 errors = true;
709 break;
710 }
711 if (errors) break;
712 }
713 //Validations
714 if (errors){
aeb128e2 715 if (data) free(data);
3e134b4c 716 return usage_legic_calccrc8();
717 }
718
719 switch (type){
720 case 16:
721 PrintAndLog("LEGIC CRC16: %X", CRC16Legic(data, len, uidcrc));
722 break;
723 default:
724 PrintAndLog("LEGIC CRC8: %X", CRC8Legic(data, len) );
725 break;
eb5206bd 726 }
3b920280 727
aeb128e2 728 if (data) free(data);
3b920280 729 return 0;
730}
731
52cf34c1 732static command_t CommandTable[] = {
3b920280 733 {"help", CmdHelp, 1, "This help"},
734 {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
ffa306de 735 {"read", CmdLegicRFRead, 0, "[offset][length] <iv> -- read bytes from a LEGIC card"},
3b920280 736 {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
737 {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
738 {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
ffa306de 739 {"write", CmdLegicRfWrite,0, "<offset> <length> <iv> -- Write sample buffer (user after load or read)"},
740 {"writeraw",CmdLegicRfRawWrite, 0, "<address> <value> <iv> -- Write direct to address"},
3b920280 741 {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
742 {"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
52cf34c1 743 {NULL, NULL, 0, NULL}
744};
745
746int CmdHFLegic(const char *Cmd) {
747 clearCommandBuffer();
748 CmdsParse(CommandTable, Cmd);
749 return 0;
750}
751
752int CmdHelp(const char *Cmd) {
753 CmdsHelp(CommandTable);
754 return 0;
755}
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