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1// Merlok, 2011, 2012\r
2// people from mifare@nethemba.com, 2010\r
3//\r
4// This code is licensed to you under the terms of the GNU GPL, version 2 or,\r
5// at your option, any later version. See the LICENSE.txt file for the text of\r
6// the license.\r
7//-----------------------------------------------------------------------------\r
8// mifare commands\r
9//-----------------------------------------------------------------------------\r
10\r
11#include "mifarehost.h"\r
12\r
13#include <stdio.h>\r
14#include <stdlib.h> \r
15#include <string.h>\r
16#include <pthread.h>\r
17\r
18#include "crapto1/crapto1.h"\r
19#include "proxmark3.h"\r
20#include "usb_cmd.h"\r
21#include "cmdmain.h"\r
22#include "ui.h"\r
23#include "util.h"\r
24#include "iso14443crc.h"\r
25#include "mifare.h" // for ISO14A_CONNECT etc\r
26#include "protocols.h" // for MIFARE_AUTH_KEYA\r
27\r
28// mifare tracer flags used in mfTraceDecode()\r
29#define TRACE_IDLE 0x00\r
30#define TRACE_AUTH1 0x01\r
31#define TRACE_AUTH2 0x02\r
32#define TRACE_AUTH_OK 0x03\r
33#define TRACE_READ_DATA 0x04\r
34#define TRACE_WRITE_OK 0x05\r
35#define TRACE_WRITE_DATA 0x06\r
36#define TRACE_ERROR 0xFF\r
37\r
38\r
39static int compare_uint64(const void *a, const void *b) {\r
40 // didn't work: (the result is truncated to 32 bits)\r
41 //return (*(int64_t*)b - *(int64_t*)a);\r
42\r
43 // better:\r
44 if (*(uint64_t*)b == *(uint64_t*)a) return 0;\r
45 else if (*(uint64_t*)b < *(uint64_t*)a) return 1;\r
46 else return -1;\r
47}\r
48\r
49\r
50// create the intersection (common members) of two sorted lists. Lists are terminated by -1. Result will be in list1. Number of elements is returned.\r
51static uint32_t intersection(uint64_t *list1, uint64_t *list2)\r
52{\r
53 if (list1 == NULL || list2 == NULL) {\r
54 return 0;\r
55 }\r
56 uint64_t *p1, *p2, *p3;\r
57 p1 = p3 = list1; \r
58 p2 = list2;\r
59\r
60 while ( *p1 != -1 && *p2 != -1 ) {\r
61 if (compare_uint64(p1, p2) == 0) {\r
62 *p3++ = *p1++;\r
63 p2++;\r
64 }\r
65 else {\r
66 while (compare_uint64(p1, p2) < 0) ++p1;\r
67 while (compare_uint64(p1, p2) > 0) ++p2;\r
68 }\r
69 }\r
70 *p3 = -1;\r
71 return p3 - list1;\r
72}\r
73\r
74\r
75// Darkside attack (hf mf mifare)\r
76static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t **keys) {\r
77 struct Crypto1State *states;\r
78 uint32_t i, pos, rr; //nr_diff;\r
79 uint8_t bt, ks3x[8], par[8][8];\r
80 uint64_t key_recovered;\r
81 static uint64_t *keylist;\r
82 rr = 0;\r
83\r
84 // Reset the last three significant bits of the reader nonce\r
85 nr &= 0xffffff1f;\r
86\r
87 for (pos=0; pos<8; pos++) {\r
88 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;\r
89 bt = (par_info >> (pos*8)) & 0xff;\r
90 for (i=0; i<8; i++) {\r
91 par[7-pos][i] = (bt >> i) & 0x01;\r
92 }\r
93 }\r
94\r
95 states = lfsr_common_prefix(nr, rr, ks3x, par, (par_info == 0));\r
96\r
97 if (states == NULL) {\r
98 *keys = NULL;\r
99 return 0;\r
100 }\r
101\r
102 keylist = (uint64_t*)states;\r
103 \r
104 for (i = 0; keylist[i]; i++) {\r
105 lfsr_rollback_word(states+i, uid^nt, 0);\r
106 crypto1_get_lfsr(states+i, &key_recovered);\r
107 keylist[i] = key_recovered;\r
108 }\r
109 keylist[i] = -1;\r
110\r
111 *keys = keylist;\r
112 return i;\r
113}\r
114\r
115\r
116int mfDarkside(uint64_t *key)\r
117{\r
118 uint32_t uid = 0;\r
119 uint32_t nt = 0, nr = 0;\r
120 uint64_t par_list = 0, ks_list = 0;\r
121 uint64_t *keylist = NULL, *last_keylist = NULL;\r
122 uint32_t keycount = 0;\r
123 int16_t isOK = 0;\r
124\r
125 UsbCommand c = {CMD_READER_MIFARE, {true, 0, 0}};\r
126\r
127 // message\r
128 printf("-------------------------------------------------------------------------\n");\r
129 printf("Executing command. Expected execution time: 25sec on average\n");\r
130 printf("Press button on the proxmark3 device to abort both proxmark3 and client.\n");\r
131 printf("-------------------------------------------------------------------------\n");\r
132\r
133 \r
134 while (true) {\r
135 clearCommandBuffer();\r
136 SendCommand(&c);\r
137 \r
138 //flush queue\r
139 while (ukbhit()) {\r
140 int c = getchar(); (void) c;\r
141 }\r
142 \r
143 // wait cycle\r
144 while (true) {\r
145 printf(".");\r
146 fflush(stdout);\r
147 if (ukbhit()) {\r
148 return -5;\r
149 break;\r
150 }\r
151 \r
152 UsbCommand resp;\r
153 if (WaitForResponseTimeout(CMD_ACK, &resp, 1000)) {\r
154 isOK = resp.arg[0];\r
155 if (isOK < 0) {\r
156 return isOK;\r
157 }\r
158 uid = (uint32_t)bytes_to_num(resp.d.asBytes + 0, 4);\r
159 nt = (uint32_t)bytes_to_num(resp.d.asBytes + 4, 4);\r
160 par_list = bytes_to_num(resp.d.asBytes + 8, 8);\r
161 ks_list = bytes_to_num(resp.d.asBytes + 16, 8);\r
162 nr = bytes_to_num(resp.d.asBytes + 24, 4);\r
163 break;\r
164 }\r
165 } \r
166\r
167 if (par_list == 0 && c.arg[0] == true) {\r
168 PrintAndLog("Parity is all zero. Most likely this card sends NACK on every failed authentication.");\r
169 PrintAndLog("Attack will take a few seconds longer because we need two consecutive successful runs.");\r
170 }\r
171 c.arg[0] = false;\r
172\r
173 keycount = nonce2key(uid, nt, nr, par_list, ks_list, &keylist);\r
174\r
175 if (keycount == 0) {\r
176 PrintAndLog("Key not found (lfsr_common_prefix list is null). Nt=%08x", nt); \r
177 PrintAndLog("This is expected to happen in 25%% of all cases. Trying again with a different reader nonce...");\r
178 continue;\r
179 }\r
180\r
181 qsort(keylist, keycount, sizeof(*keylist), compare_uint64);\r
182 keycount = intersection(last_keylist, keylist);\r
183 if (keycount == 0) {\r
184 free(last_keylist);\r
185 last_keylist = keylist;\r
186 continue;\r
187 }\r
188\r
189 if (keycount > 1) {\r
190 PrintAndLog("Found %u possible keys. Trying to authenticate with each of them ...\n", keycount);\r
191 } else {\r
192 PrintAndLog("Found a possible key. Trying to authenticate...\n");\r
193 } \r
194\r
195 *key = -1;\r
196 uint8_t keyBlock[USB_CMD_DATA_SIZE];\r
197 int max_keys = USB_CMD_DATA_SIZE/6;\r
198 for (int i = 0; i < keycount; i += max_keys) {\r
199 int size = keycount - i > max_keys ? max_keys : keycount - i;\r
200 for (int j = 0; j < size; j++) {\r
201 if (last_keylist == NULL) {\r
202 num_to_bytes(keylist[i*max_keys + j], 6, keyBlock);\r
203 } else {\r
204 num_to_bytes(last_keylist[i*max_keys + j], 6, keyBlock);\r
205 }\r
206 }\r
207 if (!mfCheckKeys(0, 0, false, size, keyBlock, key)) {\r
208 break;\r
209 }\r
210 } \r
211 \r
212 if (*key != -1) {\r
213 free(last_keylist);\r
214 free(keylist);\r
215 break;\r
216 } else {\r
217 PrintAndLog("Authentication failed. Trying again...");\r
218 free(last_keylist);\r
219 last_keylist = keylist;\r
220 }\r
221 }\r
222 \r
223 return 0;\r
224}\r
225\r
226\r
227int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
228\r
229 *key = -1;\r
230\r
231 UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};\r
232 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
233 SendCommand(&c);\r
234\r
235 UsbCommand resp;\r
236 if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;\r
237 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
238 *key = bytes_to_num(resp.d.asBytes, 6);\r
239 return 0;\r
240}\r
241\r
242// Compare 16 Bits out of cryptostate\r
243int Compare16Bits(const void * a, const void * b) {\r
244 if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;\r
245 else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;\r
246 else return -1;\r
247}\r
248\r
249typedef \r
250 struct {\r
251 union {\r
252 struct Crypto1State *slhead;\r
253 uint64_t *keyhead;\r
254 } head;\r
255 union {\r
256 struct Crypto1State *sltail;\r
257 uint64_t *keytail;\r
258 } tail;\r
259 uint32_t len;\r
260 uint32_t uid;\r
261 uint32_t blockNo;\r
262 uint32_t keyType;\r
263 uint32_t nt;\r
264 uint32_t ks1;\r
265 } StateList_t;\r
266\r
267\r
268// wrapper function for multi-threaded lfsr_recovery32\r
269void* nested_worker_thread(void *arg)\r
270{\r
271 struct Crypto1State *p1;\r
272 StateList_t *statelist = arg;\r
273\r
274 statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);\r
275 for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);\r
276 statelist->len = p1 - statelist->head.slhead;\r
277 statelist->tail.sltail = --p1;\r
278 qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\r
279 \r
280 return statelist->head.slhead;\r
281}\r
282\r
283int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate) \r
284{\r
285 uint16_t i;\r
286 uint32_t uid;\r
287 UsbCommand resp;\r
288\r
289 StateList_t statelists[2];\r
290 struct Crypto1State *p1, *p2, *p3, *p4;\r
291 \r
292 // flush queue\r
293 WaitForResponseTimeout(CMD_ACK, NULL, 100);\r
294 \r
295 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
296 memcpy(c.d.asBytes, key, 6);\r
297 SendCommand(&c);\r
298\r
299 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
300 return -1;\r
301 }\r
302\r
303 if (resp.arg[0]) {\r
304 return resp.arg[0]; // error during nested\r
305 }\r
306 \r
307 memcpy(&uid, resp.d.asBytes, 4);\r
308 PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r
309 \r
310 for (i = 0; i < 2; i++) {\r
311 statelists[i].blockNo = resp.arg[2] & 0xff;\r
312 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
313 statelists[i].uid = uid;\r
314 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
315 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
316 }\r
317 \r
318 // calc keys\r
319 \r
320 pthread_t thread_id[2];\r
321 \r
322 // create and run worker threads\r
323 for (i = 0; i < 2; i++) {\r
324 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
325 }\r
326 \r
327 // wait for threads to terminate:\r
328 for (i = 0; i < 2; i++) {\r
329 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
330 }\r
331\r
332\r
333 // the first 16 Bits of the cryptostate already contain part of our key.\r
334 // Create the intersection of the two lists based on these 16 Bits and\r
335 // roll back the cryptostate\r
336 p1 = p3 = statelists[0].head.slhead; \r
337 p2 = p4 = statelists[1].head.slhead;\r
338 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
339 if (Compare16Bits(p1, p2) == 0) {\r
340 struct Crypto1State savestate, *savep = &savestate;\r
341 savestate = *p1;\r
342 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
343 *p3 = *p1;\r
344 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
345 p3++;\r
346 p1++;\r
347 }\r
348 savestate = *p2;\r
349 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
350 *p4 = *p2;\r
351 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
352 p4++;\r
353 p2++;\r
354 }\r
355 }\r
356 else {\r
357 while (Compare16Bits(p1, p2) == -1) p1++;\r
358 while (Compare16Bits(p1, p2) == 1) p2++;\r
359 }\r
360 }\r
361 *(uint64_t*)p3 = -1;\r
362 *(uint64_t*)p4 = -1;\r
363 statelists[0].len = p3 - statelists[0].head.slhead;\r
364 statelists[1].len = p4 - statelists[1].head.slhead;\r
365 statelists[0].tail.sltail=--p3;\r
366 statelists[1].tail.sltail=--p4;\r
367\r
368 // the statelists now contain possible keys. The key we are searching for must be in the\r
369 // intersection of both lists. Create the intersection:\r
370 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compare_uint64);\r
371 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compare_uint64);\r
372 statelists[0].len = intersection(statelists[0].head.keyhead, statelists[1].head.keyhead);\r
373\r
374 memset(resultKey, 0, 6);\r
375 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
376 for (i = 0; i < statelists[0].len; i++) {\r
377 uint8_t keyBlock[6];\r
378 uint64_t key64;\r
379 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
380 num_to_bytes(key64, 6, keyBlock);\r
381 key64 = 0;\r
382 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
383 num_to_bytes(key64, 6, resultKey);\r
384 break;\r
385 }\r
386 }\r
387 \r
388 free(statelists[0].head.slhead);\r
389 free(statelists[1].head.slhead);\r
390 \r
391 return 0;\r
392}\r
393\r
394// EMULATOR\r
395\r
396int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
397 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
398 SendCommand(&c);\r
399\r
400 UsbCommand resp;\r
401 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
402 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
403 return 0;\r
404}\r
405\r
406int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
407 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};\r
408 memcpy(c.d.asBytes, data, blocksCount * 16); \r
409 SendCommand(&c);\r
410 return 0;\r
411}\r
412\r
413// "MAGIC" CARD\r
414\r
415int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
416 uint8_t isOK = 0;\r
417\r
418 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};\r
419 SendCommand(&c);\r
420\r
421 UsbCommand resp;\r
422 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
423 isOK = resp.arg[0] & 0xff;\r
424 memcpy(data, resp.d.asBytes, 16);\r
425 if (!isOK) return 2;\r
426 } else {\r
427 PrintAndLog("Command execute timeout");\r
428 return 1;\r
429 }\r
430 return 0;\r
431}\r
432\r
433int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {\r
434\r
435 uint8_t isOK = 0;\r
436 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};\r
437 memcpy(c.d.asBytes, data, 16); \r
438 SendCommand(&c);\r
439\r
440 UsbCommand resp;\r
441 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
442 isOK = resp.arg[0] & 0xff;\r
443 if (uid != NULL) \r
444 memcpy(uid, resp.d.asBytes, 4);\r
445 if (!isOK) \r
446 return 2;\r
447 } else {\r
448 PrintAndLog("Command execute timeout");\r
449 return 1;\r
450 }\r
451 return 0;\r
452}\r
453\r
454int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool wantWipe) {\r
455 uint8_t oldblock0[16] = {0x00};\r
456 uint8_t block0[16] = {0x00};\r
457\r
458 int old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);\r
459 if (old == 0) {\r
460 memcpy(block0, oldblock0, 16);\r
461 PrintAndLog("old block 0: %s", sprint_hex(block0,16));\r
462 } else {\r
463 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
464 }\r
465\r
466 // fill in the new values\r
467 // UID\r
468 memcpy(block0, uid, 4); \r
469 // Mifare UID BCC\r
470 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
471 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
472 if (sak!=NULL)\r
473 block0[5]=sak[0];\r
474 if (atqa!=NULL) {\r
475 block0[6]=atqa[1];\r
476 block0[7]=atqa[0];\r
477 }\r
478 PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r
479 return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);\r
480}\r
481\r
482// SNIFFER\r
483\r
484// constants\r
485static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
486\r
487// variables\r
488char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
489static uint8_t traceCard[4096] = {0x00};\r
490static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
491static int traceState = TRACE_IDLE;\r
492static uint8_t traceCurBlock = 0;\r
493static uint8_t traceCurKey = 0;\r
494\r
495struct Crypto1State *traceCrypto1 = NULL;\r
496\r
497struct Crypto1State *revstate;\r
498uint64_t lfsr;\r
499uint32_t ks2;\r
500uint32_t ks3;\r
501\r
502uint32_t uid; // serial number\r
503uint32_t nt; // tag challenge\r
504uint32_t nr_enc; // encrypted reader challenge\r
505uint32_t ar_enc; // encrypted reader response\r
506uint32_t at_enc; // encrypted tag response\r
507\r
508int isTraceCardEmpty(void) {\r
509 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
510}\r
511\r
512int isBlockEmpty(int blockN) {\r
513 for (int i = 0; i < 16; i++) \r
514 if (traceCard[blockN * 16 + i] != 0) return 0;\r
515\r
516 return 1;\r
517}\r
518\r
519int isBlockTrailer(int blockN) {\r
520 return ((blockN & 0x03) == 0x03);\r
521}\r
522\r
523int saveTraceCard(void) {\r
524 FILE * f;\r
525 \r
526 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
527 \r
528 f = fopen(traceFileName, "w+");\r
529 if ( !f ) return 1;\r
530 \r
531 for (int i = 0; i < 64; i++) { // blocks\r
532 for (int j = 0; j < 16; j++) // bytes\r
533 fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
534 fprintf(f,"\n");\r
535 }\r
536 fclose(f);\r
537 return 0;\r
538}\r
539\r
540int loadTraceCard(uint8_t *tuid) {\r
541 FILE * f;\r
542 char buf[64] = {0x00};\r
543 uint8_t buf8[64] = {0x00};\r
544 int i, blockNum;\r
545 \r
546 if (!isTraceCardEmpty()) \r
547 saveTraceCard();\r
548 \r
549 memset(traceCard, 0x00, 4096);\r
550 memcpy(traceCard, tuid + 3, 4);\r
551\r
552 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
553\r
554 f = fopen(traceFileName, "r");\r
555 if (!f) return 1;\r
556 \r
557 blockNum = 0;\r
558 \r
559 while(!feof(f)){\r
560 \r
561 memset(buf, 0, sizeof(buf));\r
562 if (fgets(buf, sizeof(buf), f) == NULL) {\r
563 PrintAndLog("File reading error.");\r
564 fclose(f);\r
565 return 2;\r
566 }\r
567\r
568 if (strlen(buf) < 32){\r
569 if (feof(f)) break;\r
570 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
571 fclose(f);\r
572 return 2;\r
573 }\r
574 for (i = 0; i < 32; i += 2)\r
575 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
576\r
577 memcpy(traceCard + blockNum * 16, buf8, 16);\r
578\r
579 blockNum++;\r
580 }\r
581 fclose(f);\r
582\r
583 return 0;\r
584}\r
585\r
586int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
587\r
588 if (traceCrypto1) \r
589 crypto1_destroy(traceCrypto1);\r
590\r
591 traceCrypto1 = NULL;\r
592\r
593 if (wantSaveToEmlFile) \r
594 loadTraceCard(tuid);\r
595 \r
596 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
597 traceCard[5] = sak;\r
598 memcpy(&traceCard[6], atqa, 2);\r
599 traceCurBlock = 0;\r
600 uid = bytes_to_num(tuid + 3, 4);\r
601 \r
602 traceState = TRACE_IDLE;\r
603\r
604 return 0;\r
605}\r
606\r
607void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
608 uint8_t bt = 0;\r
609 int i;\r
610 \r
611 if (len != 1) {\r
612 for (i = 0; i < len; i++)\r
613 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
614 } else {\r
615 bt = 0;\r
616 for (i = 0; i < 4; i++)\r
617 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r
618 \r
619 data[0] = bt;\r
620 }\r
621 return;\r
622}\r
623\r
624\r
625int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
626 uint8_t data[64];\r
627\r
628 if (traceState == TRACE_ERROR) return 1;\r
629 if (len > 64) {\r
630 traceState = TRACE_ERROR;\r
631 return 1;\r
632 }\r
633 \r
634 memcpy(data, data_src, len);\r
635 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
636 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
637 PrintAndLog("dec> %s", sprint_hex(data, len));\r
638 AddLogHex(logHexFileName, "dec> ", data, len); \r
639 }\r
640 \r
641 switch (traceState) {\r
642 case TRACE_IDLE: \r
643 // check packet crc16!\r
644 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
645 PrintAndLog("dec> CRC ERROR!!!");\r
646 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r
647 traceState = TRACE_ERROR; // do not decrypt the next commands\r
648 return 1;\r
649 }\r
650 \r
651 // AUTHENTICATION\r
652 if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
653 traceState = TRACE_AUTH1;\r
654 traceCurBlock = data[1];\r
655 traceCurKey = data[0] == 60 ? 1:0;\r
656 return 0;\r
657 }\r
658\r
659 // READ\r
660 if ((len ==4) && ((data[0] == 0x30))) {\r
661 traceState = TRACE_READ_DATA;\r
662 traceCurBlock = data[1];\r
663 return 0;\r
664 }\r
665\r
666 // WRITE\r
667 if ((len ==4) && ((data[0] == 0xA0))) {\r
668 traceState = TRACE_WRITE_OK;\r
669 traceCurBlock = data[1];\r
670 return 0;\r
671 }\r
672\r
673 // HALT\r
674 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
675 traceState = TRACE_ERROR; // do not decrypt the next commands\r
676 return 0;\r
677 }\r
678 \r
679 return 0;\r
680 break;\r
681 \r
682 case TRACE_READ_DATA: \r
683 if (len == 18) {\r
684 traceState = TRACE_IDLE;\r
685\r
686 if (isBlockTrailer(traceCurBlock)) {\r
687 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
688 } else {\r
689 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
690 }\r
691 if (wantSaveToEmlFile) saveTraceCard();\r
692 return 0;\r
693 } else {\r
694 traceState = TRACE_ERROR;\r
695 return 1;\r
696 }\r
697 break;\r
698\r
699 case TRACE_WRITE_OK: \r
700 if ((len == 1) && (data[0] == 0x0a)) {\r
701 traceState = TRACE_WRITE_DATA;\r
702\r
703 return 0;\r
704 } else {\r
705 traceState = TRACE_ERROR;\r
706 return 1;\r
707 }\r
708 break;\r
709\r
710 case TRACE_WRITE_DATA: \r
711 if (len == 18) {\r
712 traceState = TRACE_IDLE;\r
713\r
714 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
715 if (wantSaveToEmlFile) saveTraceCard();\r
716 return 0;\r
717 } else {\r
718 traceState = TRACE_ERROR;\r
719 return 1;\r
720 }\r
721 break;\r
722\r
723 case TRACE_AUTH1: \r
724 if (len == 4) {\r
725 traceState = TRACE_AUTH2;\r
726 nt = bytes_to_num(data, 4);\r
727 return 0;\r
728 } else {\r
729 traceState = TRACE_ERROR;\r
730 return 1;\r
731 }\r
732 break;\r
733\r
734 case TRACE_AUTH2: \r
735 if (len == 8) {\r
736 traceState = TRACE_AUTH_OK;\r
737\r
738 nr_enc = bytes_to_num(data, 4);\r
739 ar_enc = bytes_to_num(data + 4, 4);\r
740 return 0;\r
741 } else {\r
742 traceState = TRACE_ERROR;\r
743 return 1;\r
744 }\r
745 break;\r
746\r
747 case TRACE_AUTH_OK: \r
748 if (len ==4) {\r
749 traceState = TRACE_IDLE;\r
750\r
751 at_enc = bytes_to_num(data, 4);\r
752 \r
753 // decode key here)\r
754 ks2 = ar_enc ^ prng_successor(nt, 64);\r
755 ks3 = at_enc ^ prng_successor(nt, 96);\r
756 revstate = lfsr_recovery64(ks2, ks3);\r
757 lfsr_rollback_word(revstate, 0, 0);\r
758 lfsr_rollback_word(revstate, 0, 0);\r
759 lfsr_rollback_word(revstate, nr_enc, 1);\r
760 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
761\r
762 crypto1_get_lfsr(revstate, &lfsr);\r
763 printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));\r
764 AddLogUint64(logHexFileName, "key> ", lfsr); \r
765 \r
766 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
767 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
768 \r
769 if (traceCurKey) {\r
770 num_to_bytes(lfsr, 6, traceCard + blockShift + 10);\r
771 } else {\r
772 num_to_bytes(lfsr, 6, traceCard + blockShift);\r
773 }\r
774 if (wantSaveToEmlFile) saveTraceCard();\r
775\r
776 if (traceCrypto1) {\r
777 crypto1_destroy(traceCrypto1);\r
778 }\r
779 \r
780 // set cryptosystem state\r
781 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
782 \r
783// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
784\r
785 /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr\r
786 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
787 crypto1_word(traceCrypto1, ar, 1);\r
788 crypto1_word(traceCrypto1, 0, 0);\r
789 crypto1_word(traceCrypto1, 0, 0);*/\r
790 \r
791 return 0;\r
792 } else {\r
793 traceState = TRACE_ERROR;\r
794 return 1;\r
795 }\r
796 break;\r
797\r
798 default: \r
799 traceState = TRACE_ERROR;\r
800 return 1;\r
801 }\r
802\r
803 return 0;\r
804}\r
805\r
806int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
807 /*\r
808 uint32_t nt; // tag challenge\r
809 uint32_t ar_enc; // encrypted reader response\r
810 uint32_t at_enc; // encrypted tag response\r
811 */\r
812 if (traceCrypto1) {\r
813 crypto1_destroy(traceCrypto1);\r
814 }\r
815 ks2 = ar_enc ^ prng_successor(nt, 64);\r
816 ks3 = at_enc ^ prng_successor(nt, 96);\r
817 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
818\r
819 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
820\r
821 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
822 crypto1_destroy(traceCrypto1);\r
823 return 0;\r
824}\r
825/* Detect Tag Prng, \r
826* function performs a partial AUTH, where it tries to authenticate against block0, key A, but only collects tag nonce.\r
827* the tag nonce is check to see if it has a predictable PRNG.\r
828* @returns \r
829* TRUE if tag uses WEAK prng (ie Darkside attack possible)\r
830* FALSE is tag uses HARDEND prng (ie hardnested attack possible, with known key)\r
831*/\r
832bool detect_classic_prng(){\r
833\r
834 UsbCommand resp, respA; \r
835 uint8_t cmd[] = {MIFARE_AUTH_KEYA, 0x00};\r
836 uint32_t flags = ISO14A_CONNECT | ISO14A_RAW | ISO14A_APPEND_CRC;\r
837 \r
838 UsbCommand cAuth = {CMD_READER_ISO_14443a, {flags, sizeof(cmd), 0}};\r
839 memcpy(cAuth.d.asBytes, cmd, sizeof(cmd));\r
840\r
841 clearCommandBuffer();\r
842 SendCommand(&cAuth);\r
843 WaitForResponse(CMD_ACK, &resp);\r
844 WaitForResponse(CMD_ACK, &respA);\r
845 \r
846 // if select tag failed.\r
847 if ( resp.arg[0] == 0 ) {\r
848 printf("Error: selecting tag failed, can't detect prng\n");\r
849 return false;\r
850 }\r
851\r
852 uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]);\r
853 return validate_prng_nonce(nonce);\r
854}\r
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