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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\r
26#include "mifare.h"\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
242int mfCheckKeysSec(uint8_t sectorCnt, uint8_t keyType, uint8_t timeout14a, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, sector_t * e_sector){\r
243\r
244 uint8_t keyPtr = 0;\r
245\r
246 if (e_sector == NULL)\r
247 return -1;\r
248\r
249 UsbCommand c = {CMD_MIFARE_CHKKEYS, {((sectorCnt & 0xff) | ((keyType & 0xff) << 8)), (clear_trace | 0x02)|((timeout14a & 0xff) << 8), keycnt}}; \r
250 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
251 SendCommand(&c);\r
252\r
253 UsbCommand resp;\r
254 if (!WaitForResponseTimeoutW(CMD_ACK, &resp, MAX(3000, 1000 + 13 * sectorCnt * keycnt * (keyType == 2 ? 2 : 1)), false)) return 1; // timeout: 13 ms / fail auth\r
255 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
256 \r
257 bool foundAKey = false;\r
258 for(int sec = 0; sec < sectorCnt; sec++){\r
259 for(int keyAB = 0; keyAB < 2; keyAB++){\r
260 keyPtr = *(resp.d.asBytes + keyAB * 40 + sec);\r
261 if (keyPtr){\r
262 e_sector[sec].foundKey[keyAB] = true;\r
263 e_sector[sec].Key[keyAB] = bytes_to_num(keyBlock + (keyPtr - 1) * 6, 6);\r
264 foundAKey = true;\r
265 }\r
266 }\r
267 }\r
268 return foundAKey ? 0 : 3;\r
269}\r
270\r
271// Compare 16 Bits out of cryptostate\r
272int Compare16Bits(const void * a, const void * b) {\r
273 if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;\r
274 else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;\r
275 else return -1;\r
276}\r
277\r
278typedef\r
279 struct {\r
280 union {\r
281 struct Crypto1State *slhead;\r
282 uint64_t *keyhead;\r
283 } head;\r
284 union {\r
285 struct Crypto1State *sltail;\r
286 uint64_t *keytail;\r
287 } tail;\r
288 uint32_t len;\r
289 uint32_t uid;\r
290 uint32_t blockNo;\r
291 uint32_t keyType;\r
292 uint32_t nt;\r
293 uint32_t ks1;\r
294 } StateList_t;\r
295\r
296\r
297// wrapper function for multi-threaded lfsr_recovery32\r
298void* nested_worker_thread(void *arg)\r
299{\r
300 struct Crypto1State *p1;\r
301 StateList_t *statelist = arg;\r
302\r
303 statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);\r
304 for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);\r
305 statelist->len = p1 - statelist->head.slhead;\r
306 statelist->tail.sltail = --p1;\r
307 qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\r
308\r
309 return statelist->head.slhead;\r
310}\r
311\r
312int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate)\r
313{\r
314 uint16_t i;\r
315 uint32_t uid;\r
316 UsbCommand resp;\r
317\r
318 StateList_t statelists[2];\r
319 struct Crypto1State *p1, *p2, *p3, *p4;\r
320\r
321 // flush queue\r
322 WaitForResponseTimeout(CMD_ACK, NULL, 100);\r
323\r
324 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
325 memcpy(c.d.asBytes, key, 6);\r
326 SendCommand(&c);\r
327\r
328 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
329 return -1;\r
330 }\r
331\r
332 if (resp.arg[0]) {\r
333 return resp.arg[0]; // error during nested\r
334 }\r
335\r
336 memcpy(&uid, resp.d.asBytes, 4);\r
337 PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r
338\r
339 for (i = 0; i < 2; i++) {\r
340 statelists[i].blockNo = resp.arg[2] & 0xff;\r
341 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
342 statelists[i].uid = uid;\r
343 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
344 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
345 }\r
346\r
347 // calc keys\r
348\r
349 pthread_t thread_id[2];\r
350\r
351 // create and run worker threads\r
352 for (i = 0; i < 2; i++) {\r
353 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
354 }\r
355\r
356 // wait for threads to terminate:\r
357 for (i = 0; i < 2; i++) {\r
358 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
359 }\r
360\r
361\r
362 // the first 16 Bits of the cryptostate already contain part of our key.\r
363 // Create the intersection of the two lists based on these 16 Bits and\r
364 // roll back the cryptostate\r
365 p1 = p3 = statelists[0].head.slhead;\r
366 p2 = p4 = statelists[1].head.slhead;\r
367 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
368 if (Compare16Bits(p1, p2) == 0) {\r
369 struct Crypto1State savestate, *savep = &savestate;\r
370 savestate = *p1;\r
371 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
372 *p3 = *p1;\r
373 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
374 p3++;\r
375 p1++;\r
376 }\r
377 savestate = *p2;\r
378 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
379 *p4 = *p2;\r
380 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
381 p4++;\r
382 p2++;\r
383 }\r
384 }\r
385 else {\r
386 while (Compare16Bits(p1, p2) == -1) p1++;\r
387 while (Compare16Bits(p1, p2) == 1) p2++;\r
388 }\r
389 }\r
390 *(uint64_t*)p3 = -1;\r
391 *(uint64_t*)p4 = -1;\r
392 statelists[0].len = p3 - statelists[0].head.slhead;\r
393 statelists[1].len = p4 - statelists[1].head.slhead;\r
394 statelists[0].tail.sltail=--p3;\r
395 statelists[1].tail.sltail=--p4;\r
396\r
397 // the statelists now contain possible keys. The key we are searching for must be in the\r
398 // intersection of both lists. Create the intersection:\r
399 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compare_uint64);\r
400 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compare_uint64);\r
401 statelists[0].len = intersection(statelists[0].head.keyhead, statelists[1].head.keyhead);\r
402\r
403 memset(resultKey, 0, 6);\r
404 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
405 for (i = 0; i < statelists[0].len; i++) {\r
406 uint8_t keyBlock[6];\r
407 uint64_t key64;\r
408 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
409 num_to_bytes(key64, 6, keyBlock);\r
410 key64 = 0;\r
411 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
412 num_to_bytes(key64, 6, resultKey);\r
413 break;\r
414 }\r
415 }\r
416\r
417 free(statelists[0].head.slhead);\r
418 free(statelists[1].head.slhead);\r
419\r
420 return 0;\r
421}\r
422\r
423// EMULATOR\r
424\r
425int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
426 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
427 SendCommand(&c);\r
428\r
429 UsbCommand resp;\r
430 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
431 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
432 return 0;\r
433}\r
434\r
435int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
436 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};\r
437 memcpy(c.d.asBytes, data, blocksCount * 16);\r
438 SendCommand(&c);\r
439 return 0;\r
440}\r
441\r
442// "MAGIC" CARD\r
443\r
444int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
445 uint8_t isOK = 0;\r
446\r
447 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};\r
448 SendCommand(&c);\r
449\r
450 UsbCommand resp;\r
451 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
452 isOK = resp.arg[0] & 0xff;\r
453 memcpy(data, resp.d.asBytes, 16);\r
454 if (!isOK) return 2;\r
455 } else {\r
456 PrintAndLog("Command execute timeout");\r
457 return 1;\r
458 }\r
459 return 0;\r
460}\r
461\r
462int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {\r
463\r
464 uint8_t isOK = 0;\r
465 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};\r
466 memcpy(c.d.asBytes, data, 16);\r
467 SendCommand(&c);\r
468\r
469 UsbCommand resp;\r
470 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
471 isOK = resp.arg[0] & 0xff;\r
472 if (uid != NULL)\r
473 memcpy(uid, resp.d.asBytes, 4);\r
474 if (!isOK)\r
475 return 2;\r
476 } else {\r
477 PrintAndLog("Command execute timeout");\r
478 return 1;\r
479 }\r
480\r
481 return 0;\r
482}\r
483\r
484int mfCWipe(uint32_t numSectors, bool gen1b, bool wantWipe, bool wantFill) {\r
485 uint8_t isOK = 0;\r
486 uint8_t cmdParams = wantWipe + wantFill * 0x02 + gen1b * 0x04;\r
487 UsbCommand c = {CMD_MIFARE_CWIPE, {numSectors, cmdParams, 0}};\r
488 SendCommand(&c);\r
489\r
490 UsbCommand resp;\r
491 WaitForResponse(CMD_ACK,&resp);\r
492 isOK = resp.arg[0] & 0xff;\r
493 \r
494 return isOK;\r
495}\r
496\r
497int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID) {\r
498 uint8_t oldblock0[16] = {0x00};\r
499 uint8_t block0[16] = {0x00};\r
500 int gen = 0, res;\r
501\r
502 gen = mfCIdentify();\r
503\r
504 /* generation 1a magic card by default */\r
505 uint8_t cmdParams = CSETBLOCK_SINGLE_OPER;\r
506 if (gen == 2) {\r
507 /* generation 1b magic card */\r
508 cmdParams = CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B;\r
509 }\r
510 \r
511 res = mfCGetBlock(0, oldblock0, cmdParams);\r
512\r
513 if (res == 0) {\r
514 memcpy(block0, oldblock0, 16);\r
515 PrintAndLog("old block 0: %s", sprint_hex(block0,16));\r
516 } else {\r
517 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
518 }\r
519\r
520 // fill in the new values\r
521 // UID\r
522 memcpy(block0, uid, 4);\r
523 // Mifare UID BCC\r
524 block0[4] = block0[0] ^ block0[1] ^ block0[2] ^ block0[3];\r
525 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
526 if (sak != NULL)\r
527 block0[5] = sak[0];\r
528 if (atqa != NULL) {\r
529 block0[6] = atqa[1];\r
530 block0[7] = atqa[0];\r
531 }\r
532 PrintAndLog("new block 0: %s", sprint_hex(block0, 16));\r
533\r
534 res = mfCSetBlock(0, block0, oldUID, false, cmdParams);\r
535 if (res) {\r
536 PrintAndLog("Can't set block 0. Error: %d", res);\r
537 return res;\r
538 }\r
539 \r
540 return 0;\r
541}\r
542\r
543int mfCIdentify() {\r
544 UsbCommand c = {CMD_MIFARE_CIDENT, {0, 0, 0}};\r
545 SendCommand(&c);\r
546 UsbCommand resp;\r
547 WaitForResponse(CMD_ACK,&resp);\r
548\r
549 uint8_t isGeneration = resp.arg[0] & 0xff;\r
550 switch( isGeneration ){\r
551 case 1: PrintAndLog("Chinese magic backdoor commands (GEN 1a) detected"); break;\r
552 case 2: PrintAndLog("Chinese magic backdoor command (GEN 1b) detected"); break;\r
553 default: PrintAndLog("No chinese magic backdoor command detected"); break;\r
554 }\r
555\r
556 return (int) isGeneration;\r
557}\r
558\r
559\r
560// SNIFFER\r
561\r
562// constants\r
563static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
564\r
565// variables\r
566char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
567static uint8_t traceCard[4096] = {0x00};\r
568static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
569static int traceState = TRACE_IDLE;\r
570static uint8_t traceCurBlock = 0;\r
571static uint8_t traceCurKey = 0;\r
572\r
573struct Crypto1State *traceCrypto1 = NULL;\r
574\r
575struct Crypto1State *revstate;\r
576uint64_t lfsr;\r
577uint32_t ks2;\r
578uint32_t ks3;\r
579\r
580uint32_t uid; // serial number\r
581uint32_t nt; // tag challenge\r
582uint32_t nr_enc; // encrypted reader challenge\r
583uint32_t ar_enc; // encrypted reader response\r
584uint32_t at_enc; // encrypted tag response\r
585\r
586int isTraceCardEmpty(void) {\r
587 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
588}\r
589\r
590int isBlockEmpty(int blockN) {\r
591 for (int i = 0; i < 16; i++)\r
592 if (traceCard[blockN * 16 + i] != 0) return 0;\r
593\r
594 return 1;\r
595}\r
596\r
597int isBlockTrailer(int blockN) {\r
598 return ((blockN & 0x03) == 0x03);\r
599}\r
600\r
601int saveTraceCard(void) {\r
602 FILE * f;\r
603\r
604 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
605\r
606 f = fopen(traceFileName, "w+");\r
607 if ( !f ) return 1;\r
608\r
609 for (int i = 0; i < 64; i++) { // blocks\r
610 for (int j = 0; j < 16; j++) // bytes\r
611 fprintf(f, "%02x", *(traceCard + i * 16 + j));\r
612 fprintf(f,"\n");\r
613 }\r
614 fclose(f);\r
615 return 0;\r
616}\r
617\r
618int loadTraceCard(uint8_t *tuid) {\r
619 FILE * f;\r
620 char buf[64] = {0x00};\r
621 uint8_t buf8[64] = {0x00};\r
622 int i, blockNum;\r
623\r
624 if (!isTraceCardEmpty())\r
625 saveTraceCard();\r
626\r
627 memset(traceCard, 0x00, 4096);\r
628 memcpy(traceCard, tuid + 3, 4);\r
629\r
630 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
631\r
632 f = fopen(traceFileName, "r");\r
633 if (!f) return 1;\r
634\r
635 blockNum = 0;\r
636\r
637 while(!feof(f)){\r
638\r
639 memset(buf, 0, sizeof(buf));\r
640 if (fgets(buf, sizeof(buf), f) == NULL) {\r
641 PrintAndLog("File reading error.");\r
642 fclose(f);\r
643 return 2;\r
644 }\r
645\r
646 if (strlen(buf) < 32){\r
647 if (feof(f)) break;\r
648 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
649 fclose(f);\r
650 return 2;\r
651 }\r
652 for (i = 0; i < 32; i += 2)\r
653 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
654\r
655 memcpy(traceCard + blockNum * 16, buf8, 16);\r
656\r
657 blockNum++;\r
658 }\r
659 fclose(f);\r
660\r
661 return 0;\r
662}\r
663\r
664int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
665\r
666 if (traceCrypto1)\r
667 crypto1_destroy(traceCrypto1);\r
668\r
669 traceCrypto1 = NULL;\r
670\r
671 if (wantSaveToEmlFile)\r
672 loadTraceCard(tuid);\r
673\r
674 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
675 traceCard[5] = sak;\r
676 memcpy(&traceCard[6], atqa, 2);\r
677 traceCurBlock = 0;\r
678 uid = bytes_to_num(tuid + 3, 4);\r
679\r
680 traceState = TRACE_IDLE;\r
681\r
682 return 0;\r
683}\r
684\r
685void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
686 uint8_t bt = 0;\r
687 int i;\r
688\r
689 if (len != 1) {\r
690 for (i = 0; i < len; i++)\r
691 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
692 } else {\r
693 bt = 0;\r
694 for (i = 0; i < 4; i++)\r
695 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r
696\r
697 data[0] = bt;\r
698 }\r
699 return;\r
700}\r
701\r
702\r
703int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
704 uint8_t data[64];\r
705\r
706 if (traceState == TRACE_ERROR) return 1;\r
707 if (len > 64) {\r
708 traceState = TRACE_ERROR;\r
709 return 1;\r
710 }\r
711\r
712 memcpy(data, data_src, len);\r
713 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
714 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
715 PrintAndLog("dec> %s", sprint_hex(data, len));\r
716 AddLogHex(logHexFileName, "dec> ", data, len);\r
717 }\r
718\r
719 switch (traceState) {\r
720 case TRACE_IDLE:\r
721 // check packet crc16!\r
722 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
723 PrintAndLog("dec> CRC ERROR!!!");\r
724 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");\r
725 traceState = TRACE_ERROR; // do not decrypt the next commands\r
726 return 1;\r
727 }\r
728\r
729 // AUTHENTICATION\r
730 if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
731 traceState = TRACE_AUTH1;\r
732 traceCurBlock = data[1];\r
733 traceCurKey = data[0] == 60 ? 1:0;\r
734 return 0;\r
735 }\r
736\r
737 // READ\r
738 if ((len ==4) && ((data[0] == 0x30))) {\r
739 traceState = TRACE_READ_DATA;\r
740 traceCurBlock = data[1];\r
741 return 0;\r
742 }\r
743\r
744 // WRITE\r
745 if ((len ==4) && ((data[0] == 0xA0))) {\r
746 traceState = TRACE_WRITE_OK;\r
747 traceCurBlock = data[1];\r
748 return 0;\r
749 }\r
750\r
751 // HALT\r
752 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
753 traceState = TRACE_ERROR; // do not decrypt the next commands\r
754 return 0;\r
755 }\r
756\r
757 return 0;\r
758 break;\r
759\r
760 case TRACE_READ_DATA:\r
761 if (len == 18) {\r
762 traceState = TRACE_IDLE;\r
763\r
764 if (isBlockTrailer(traceCurBlock)) {\r
765 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
766 } else {\r
767 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
768 }\r
769 if (wantSaveToEmlFile) saveTraceCard();\r
770 return 0;\r
771 } else {\r
772 traceState = TRACE_ERROR;\r
773 return 1;\r
774 }\r
775 break;\r
776\r
777 case TRACE_WRITE_OK:\r
778 if ((len == 1) && (data[0] == 0x0a)) {\r
779 traceState = TRACE_WRITE_DATA;\r
780\r
781 return 0;\r
782 } else {\r
783 traceState = TRACE_ERROR;\r
784 return 1;\r
785 }\r
786 break;\r
787\r
788 case TRACE_WRITE_DATA:\r
789 if (len == 18) {\r
790 traceState = TRACE_IDLE;\r
791\r
792 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
793 if (wantSaveToEmlFile) saveTraceCard();\r
794 return 0;\r
795 } else {\r
796 traceState = TRACE_ERROR;\r
797 return 1;\r
798 }\r
799 break;\r
800\r
801 case TRACE_AUTH1:\r
802 if (len == 4) {\r
803 traceState = TRACE_AUTH2;\r
804 nt = bytes_to_num(data, 4);\r
805 return 0;\r
806 } else {\r
807 traceState = TRACE_ERROR;\r
808 return 1;\r
809 }\r
810 break;\r
811\r
812 case TRACE_AUTH2:\r
813 if (len == 8) {\r
814 traceState = TRACE_AUTH_OK;\r
815\r
816 nr_enc = bytes_to_num(data, 4);\r
817 ar_enc = bytes_to_num(data + 4, 4);\r
818 return 0;\r
819 } else {\r
820 traceState = TRACE_ERROR;\r
821 return 1;\r
822 }\r
823 break;\r
824\r
825 case TRACE_AUTH_OK:\r
826 if (len ==4) {\r
827 traceState = TRACE_IDLE;\r
828\r
829 at_enc = bytes_to_num(data, 4);\r
830\r
831 // decode key here)\r
832 ks2 = ar_enc ^ prng_successor(nt, 64);\r
833 ks3 = at_enc ^ prng_successor(nt, 96);\r
834 revstate = lfsr_recovery64(ks2, ks3);\r
835 lfsr_rollback_word(revstate, 0, 0);\r
836 lfsr_rollback_word(revstate, 0, 0);\r
837 lfsr_rollback_word(revstate, nr_enc, 1);\r
838 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
839\r
840 crypto1_get_lfsr(revstate, &lfsr);\r
841 printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));\r
842 AddLogUint64(logHexFileName, "key> ", lfsr);\r
843\r
844 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
845 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
846\r
847 if (traceCurKey) {\r
848 num_to_bytes(lfsr, 6, traceCard + blockShift + 10);\r
849 } else {\r
850 num_to_bytes(lfsr, 6, traceCard + blockShift);\r
851 }\r
852 if (wantSaveToEmlFile) saveTraceCard();\r
853\r
854 if (traceCrypto1) {\r
855 crypto1_destroy(traceCrypto1);\r
856 }\r
857\r
858 // set cryptosystem state\r
859 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
860\r
861// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
862\r
863 /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr\r
864 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
865 crypto1_word(traceCrypto1, ar, 1);\r
866 crypto1_word(traceCrypto1, 0, 0);\r
867 crypto1_word(traceCrypto1, 0, 0);*/\r
868\r
869 return 0;\r
870 } else {\r
871 traceState = TRACE_ERROR;\r
872 return 1;\r
873 }\r
874 break;\r
875\r
876 default:\r
877 traceState = TRACE_ERROR;\r
878 return 1;\r
879 }\r
880\r
881 return 0;\r
882}\r
883\r
884// DECODING\r
885\r
886int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
887 /*\r
888 uint32_t nt; // tag challenge\r
889 uint32_t ar_enc; // encrypted reader response\r
890 uint32_t at_enc; // encrypted tag response\r
891 */\r
892 if (traceCrypto1) {\r
893 crypto1_destroy(traceCrypto1);\r
894 }\r
895 ks2 = ar_enc ^ prng_successor(nt, 64);\r
896 ks3 = at_enc ^ prng_successor(nt, 96);\r
897 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
898\r
899 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
900\r
901 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
902 crypto1_destroy(traceCrypto1);\r
903 return 0;\r
904}\r
905\r
906/** validate_prng_nonce\r
907 * Determine if nonce is deterministic. ie: Suspectable to Darkside attack.\r
908 * returns\r
909 * true = weak prng\r
910 * false = hardend prng\r
911 */\r
912bool validate_prng_nonce(uint32_t nonce) {\r
913 uint16_t *dist = 0;\r
914 uint16_t x, i;\r
915\r
916 dist = malloc(2 << 16);\r
917 if(!dist)\r
918 return -1;\r
919\r
920 // init prng table:\r
921 for (x = i = 1; i; ++i) {\r
922 dist[(x & 0xff) << 8 | x >> 8] = i;\r
923 x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15;\r
924 }\r
925 \r
926 uint32_t res = (65535 - dist[nonce >> 16] + dist[nonce & 0xffff]) % 65535;\r
927 \r
928 free(dist); \r
929 return (res == 16);\r
930}\r
931\r
932/* Detect Tag Prng, \r
933* function performs a partial AUTH, where it tries to authenticate against block0, key A, but only collects tag nonce.\r
934* the tag nonce is check to see if it has a predictable PRNG.\r
935* @returns \r
936* TRUE if tag uses WEAK prng (ie Now the NACK bug also needs to be present for Darkside attack)\r
937* FALSE is tag uses HARDEND prng (ie hardnested attack possible, with known key)\r
938*/\r
939int DetectClassicPrng(void){\r
940\r
941 UsbCommand resp, respA; \r
942 uint8_t cmd[] = {0x60, 0x00}; // MIFARE_AUTH_KEYA\r
943 uint32_t flags = ISO14A_CONNECT | ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_RATS;\r
944 \r
945 UsbCommand c = {CMD_READER_ISO_14443a, {flags, sizeof(cmd), 0}};\r
946 memcpy(c.d.asBytes, cmd, sizeof(cmd));\r
947\r
948 clearCommandBuffer();\r
949 SendCommand(&c);\r
950 if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {\r
951 PrintAndLog("PRNG UID: Reply timeout.");\r
952 return -1;\r
953 }\r
954 \r
955 // if select tag failed.\r
956 if (resp.arg[0] == 0) {\r
957 PrintAndLog("PRNG error: selecting tag failed, can't detect prng.");\r
958 return -1;\r
959 }\r
960 \r
961 if (!WaitForResponseTimeout(CMD_ACK, &respA, 5000)) {\r
962 PrintAndLog("PRNG data: Reply timeout.");\r
963 return -1;\r
964 }\r
965\r
966 // check respA\r
967 if (respA.arg[0] != 4) {\r
968 PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]);\r
969 return -1;\r
970 }\r
971\r
972 uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]);\r
973 return validate_prng_nonce(nonce);\r
974}\r
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