]> git.zerfleddert.de Git - proxmark3-svn/blame_incremental - client/mifarehost.c
FIX: @marshmellow's fix for "lf viking clone", wrong mask was applied.
[proxmark3-svn] / client / mifarehost.c
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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 <stdio.h>\r
12#include <stdlib.h> \r
13#include <string.h>\r
14#include <pthread.h>\r
15#include "mifarehost.h"\r
16#include "proxmark3.h"\r
17//#include "radixsort.h"\r
18\r
19// MIFARE\r
20int compar_int(const void * a, const void * b) {\r
21 // didn't work: (the result is truncated to 32 bits)\r
22 //return (*(uint64_t*)b - *(uint64_t*)a);\r
23\r
24 // better:\r
25 // if (*(uint64_t*)b > *(uint64_t*)a) return 1;\r
26 // if (*(uint64_t*)b < *(uint64_t*)a) return -1;\r
27 // return 0;\r
28\r
29 return (*(uint64_t*)b > *(uint64_t*)a) - (*(uint64_t*)b < *(uint64_t*)a);\r
30 //return (*(int64_t*)b > *(int64_t*)a) - (*(int64_t*)b < *(int64_t*)a);\r
31}\r
32\r
33// Compare 16 Bits out of cryptostate\r
34int Compare16Bits(const void * a, const void * b) {\r
35\r
36 // if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1; \r
37 // if ((*(uint64_t*)b & 0x00ff000000ff0000) < (*(uint64_t*)a & 0x00ff000000ff0000)) return -1; \r
38 // return 0;\r
39\r
40 return \r
41 ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000))\r
42 -\r
43 ((*(uint64_t*)b & 0x00ff000000ff0000) < (*(uint64_t*)a & 0x00ff000000ff0000))\r
44 ;\r
45 // return \r
46 // ((*(int64_t*)b & 0x00ff000000ff0000) > (*(int64_t*)a & 0x00ff000000ff0000))\r
47 // -\r
48 // ((*(int64_t*)b & 0x00ff000000ff0000) < (*(int64_t*)a & 0x00ff000000ff0000))\r
49 // ;\r
50}\r
51\r
52typedef \r
53 struct {\r
54 union {\r
55 struct Crypto1State *slhead;\r
56 uint64_t *keyhead;\r
57 } head;\r
58 union {\r
59 struct Crypto1State *sltail;\r
60 uint64_t *keytail;\r
61 } tail;\r
62 uint32_t len;\r
63 uint32_t uid;\r
64 uint32_t blockNo;\r
65 uint32_t keyType;\r
66 uint32_t nt;\r
67 uint32_t ks1;\r
68 } StateList_t;\r
69\r
70\r
71// wrapper function for multi-threaded lfsr_recovery32\r
72void* nested_worker_thread(void *arg)\r
73{\r
74 struct Crypto1State *p1;\r
75 StateList_t *statelist = arg;\r
76\r
77 statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);\r
78 \r
79 for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; ++p1);\r
80 \r
81 statelist->len = p1 - statelist->head.slhead;\r
82 statelist->tail.sltail = --p1;\r
83 qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\r
84 \r
85 return statelist->head.slhead;\r
86}\r
87\r
88int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) \r
89{\r
90 uint16_t i;\r
91 uint32_t uid;\r
92 UsbCommand resp;\r
93 StateList_t statelists[2];\r
94 struct Crypto1State *p1, *p2, *p3, *p4;\r
95 \r
96 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
97 memcpy(c.d.asBytes, key, 6);\r
98 clearCommandBuffer();\r
99 SendCommand(&c);\r
100 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) return -1;\r
101\r
102 // error during nested\r
103 if (resp.arg[0]) return resp.arg[0];\r
104 \r
105 memcpy(&uid, resp.d.asBytes, 4);\r
106 \r
107 for (i = 0; i < 2; ++i) {\r
108 statelists[i].blockNo = resp.arg[2] & 0xff;\r
109 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
110 statelists[i].uid = uid;\r
111 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
112 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
113 }\r
114 \r
115 // calc keys \r
116 pthread_t thread_id[2];\r
117 \r
118 // create and run worker threads\r
119 for (i = 0; i < 2; i++)\r
120 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
121 \r
122 // wait for threads to terminate:\r
123 for (i = 0; i < 2; i++)\r
124 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
125\r
126\r
127 // the first 16 Bits of the cryptostate already contain part of our key.\r
128 // Create the intersection of the two lists based on these 16 Bits and\r
129 // roll back the cryptostate\r
130 p1 = p3 = statelists[0].head.slhead; \r
131 p2 = p4 = statelists[1].head.slhead;\r
132 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
133 if (Compare16Bits(p1, p2) == 0) {\r
134 struct Crypto1State savestate, *savep = &savestate;\r
135 savestate = *p1;\r
136 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
137 *p3 = *p1;\r
138 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
139 p3++;\r
140 p1++;\r
141 }\r
142 savestate = *p2;\r
143 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
144 *p4 = *p2;\r
145 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
146 p4++;\r
147 p2++;\r
148 }\r
149 }\r
150 else {\r
151 while (Compare16Bits(p1, p2) == -1) p1++;\r
152 while (Compare16Bits(p1, p2) == 1) p2++;\r
153 }\r
154 }\r
155 \r
156 p3->even = 0; p3->odd = 0;\r
157 p4->even = 0; p4->odd = 0;\r
158 statelists[0].len = p3 - statelists[0].head.slhead;\r
159 statelists[1].len = p4 - statelists[1].head.slhead;\r
160 statelists[0].tail.sltail=--p3;\r
161 statelists[1].tail.sltail=--p4;\r
162\r
163 // the statelists now contain possible keys. The key we are searching for must be in the\r
164 // intersection of both lists. Create the intersection:\r
165 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);\r
166 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);\r
167\r
168 // clock_t t1 = clock();\r
169 //radixSort(statelists[0].head.keyhead, statelists[0].len);\r
170 //radixSort(statelists[1].head.keyhead, statelists[1].len);\r
171 // t1 = clock() - t1; \r
172 // PrintAndLog("radixsort, ticks %.0f", (float)t1);\r
173\r
174 uint64_t *p5, *p6, *p7;\r
175 p5 = p7 = statelists[0].head.keyhead; \r
176 p6 = statelists[1].head.keyhead;\r
177 while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {\r
178 if (compar_int(p5, p6) == 0) {\r
179 *p7++ = *p5++;\r
180 p6++;\r
181 }\r
182 else {\r
183 while (compar_int(p5, p6) == -1) p5++;\r
184 while (compar_int(p5, p6) == 1) p6++;\r
185 }\r
186 }\r
187 statelists[0].len = p7 - statelists[0].head.keyhead;\r
188 statelists[0].tail.keytail = --p7;\r
189\r
190 memset(resultKey, 0, 6);\r
191 uint64_t key64 = 0;\r
192\r
193 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
194 for (i = 0; i < statelists[0].len; i++) {\r
195\r
196 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
197 num_to_bytes(key64, 6, resultKey);\r
198\r
199 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, resultKey, &key64)) {\r
200 free(statelists[0].head.slhead);\r
201 free(statelists[1].head.slhead);\r
202 PrintAndLog("UID: %08x target block:%3u key type: %c -- Found key [%012"llx"]", uid, (uint16_t)resp.arg[2] & 0xff, (resp.arg[2] >> 8)?'B':'A', key64);\r
203 return -5;\r
204 }\r
205 }\r
206 PrintAndLog("UID: %08x target block:%3u key type: %c", uid, (uint16_t)resp.arg[2] & 0xff, (resp.arg[2] >> 8)?'B':'A'); \r
207 free(statelists[0].head.slhead);\r
208 free(statelists[1].head.slhead);\r
209 return -4;\r
210}\r
211\r
212int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
213\r
214 *key = 0;\r
215 UsbCommand c = {CMD_MIFARE_CHKKEYS, { (blockNo | (keyType<<8)), clear_trace, keycnt}};\r
216 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
217 clearCommandBuffer();\r
218 SendCommand(&c);\r
219 UsbCommand resp;\r
220 if (!WaitForResponseTimeout(CMD_ACK,&resp, 3000)) return 1;\r
221 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
222 *key = bytes_to_num(resp.d.asBytes, 6);\r
223 return 0;\r
224}\r
225\r
226// EMULATOR\r
227\r
228int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
229 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
230 clearCommandBuffer();\r
231 SendCommand(&c);\r
232 UsbCommand resp;\r
233 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
234 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
235 return 0;\r
236}\r
237\r
238int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
239 return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);\r
240}\r
241\r
242int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {\r
243 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};\r
244 memcpy(c.d.asBytes, data, blocksCount * blockBtWidth); \r
245\r
246 clearCommandBuffer();\r
247 SendCommand(&c);\r
248 return 0;\r
249}\r
250\r
251// "MAGIC" CARD\r
252\r
253int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {\r
254\r
255 uint8_t params = MAGIC_SINGLE;\r
256 uint8_t block0[16];\r
257 memset(block0, 0x00, sizeof(block0));\r
258\r
259 int old = mfCGetBlock(0, block0, params);\r
260 if (old == 0)\r
261 PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));\r
262 else \r
263 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0."); \r
264\r
265 // fill in the new values\r
266 // UID\r
267 memcpy(block0, uid, 4); \r
268 // Mifare UID BCC\r
269 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
270 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
271 if ( sak != NULL )\r
272 block0[5]=sak[0];\r
273 \r
274 if ( atqa != NULL ) {\r
275 block0[6]=atqa[1];\r
276 block0[7]=atqa[0];\r
277 }\r
278 PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r
279 \r
280 if ( wipecard ) params |= MAGIC_WIPE; \r
281 if ( oldUID == NULL) params |= MAGIC_UID;\r
282 \r
283 return mfCSetBlock(0, block0, oldUID, params);\r
284}\r
285\r
286int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {\r
287\r
288 uint8_t isOK = 0;\r
289 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};\r
290 memcpy(c.d.asBytes, data, 16); \r
291 clearCommandBuffer();\r
292 SendCommand(&c);\r
293 UsbCommand resp;\r
294 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
295 isOK = resp.arg[0] & 0xff;\r
296 if (uid != NULL) \r
297 memcpy(uid, resp.d.asBytes, 4);\r
298 if (!isOK) \r
299 return 2;\r
300 } else {\r
301 PrintAndLog("Command execute timeout");\r
302 return 1;\r
303 }\r
304 return 0;\r
305}\r
306\r
307int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
308 uint8_t isOK = 0;\r
309 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}}; \r
310 clearCommandBuffer();\r
311 SendCommand(&c);\r
312 UsbCommand resp;\r
313 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
314 isOK = resp.arg[0] & 0xff;\r
315 memcpy(data, resp.d.asBytes, 16);\r
316 if (!isOK) return 2;\r
317 } else {\r
318 PrintAndLog("Command execute timeout");\r
319 return 1;\r
320 }\r
321 return 0;\r
322}\r
323\r
324// SNIFFER\r
325\r
326// constants\r
327static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
328\r
329// variables\r
330char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
331static uint8_t traceCard[4096] = {0x00};\r
332static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
333static int traceState = TRACE_IDLE;\r
334static uint8_t traceCurBlock = 0;\r
335static uint8_t traceCurKey = 0;\r
336\r
337struct Crypto1State *traceCrypto1 = NULL;\r
338\r
339struct Crypto1State *revstate = NULL;\r
340\r
341uint64_t key = 0;\r
342uint32_t ks2 = 0;\r
343uint32_t ks3 = 0;\r
344\r
345uint32_t uid = 0; // serial number\r
346uint32_t nt =0; // tag challenge\r
347uint32_t nr_enc =0; // encrypted reader challenge\r
348uint32_t ar_enc =0; // encrypted reader response\r
349uint32_t at_enc =0; // encrypted tag response\r
350\r
351int isTraceCardEmpty(void) {\r
352 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
353}\r
354\r
355int isBlockEmpty(int blockN) {\r
356 for (int i = 0; i < 16; i++) \r
357 if (traceCard[blockN * 16 + i] != 0) return 0;\r
358\r
359 return 1;\r
360}\r
361\r
362int isBlockTrailer(int blockN) {\r
363 return ((blockN & 0x03) == 0x03);\r
364}\r
365\r
366int loadTraceCard(uint8_t *tuid) {\r
367 FILE * f;\r
368 char buf[64] = {0x00};\r
369 uint8_t buf8[64] = {0x00};\r
370 int i, blockNum;\r
371 \r
372 if (!isTraceCardEmpty()) \r
373 saveTraceCard();\r
374 \r
375 memset(traceCard, 0x00, 4096);\r
376 memcpy(traceCard, tuid + 3, 4);\r
377\r
378 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
379\r
380 f = fopen(traceFileName, "r");\r
381 if (!f) return 1;\r
382 \r
383 blockNum = 0;\r
384 \r
385 while(!feof(f)){\r
386 \r
387 memset(buf, 0, sizeof(buf));\r
388 if (fgets(buf, sizeof(buf), f) == NULL) {\r
389 PrintAndLog("File reading error.");\r
390 fclose(f);\r
391 return 2;\r
392 }\r
393\r
394 if (strlen(buf) < 32){\r
395 if (feof(f)) break;\r
396 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
397 fclose(f);\r
398 return 2;\r
399 }\r
400 for (i = 0; i < 32; i += 2)\r
401 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
402\r
403 memcpy(traceCard + blockNum * 16, buf8, 16);\r
404\r
405 blockNum++;\r
406 }\r
407 fclose(f);\r
408\r
409 return 0;\r
410}\r
411\r
412int saveTraceCard(void) {\r
413 FILE * f;\r
414 \r
415 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
416 \r
417 f = fopen(traceFileName, "w+");\r
418 if ( !f ) return 1;\r
419 \r
420 for (int i = 0; i < 64; i++) { // blocks\r
421 for (int j = 0; j < 16; j++) // bytes\r
422 fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
423 fprintf(f,"\n");\r
424 }\r
425 fclose(f);\r
426 return 0;\r
427}\r
428\r
429int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
430\r
431 if (traceCrypto1) \r
432 crypto1_destroy(traceCrypto1);\r
433\r
434 traceCrypto1 = NULL;\r
435\r
436 if (wantSaveToEmlFile) \r
437 loadTraceCard(tuid);\r
438 \r
439 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
440 traceCard[5] = sak;\r
441 memcpy(&traceCard[6], atqa, 2);\r
442 traceCurBlock = 0;\r
443 uid = bytes_to_num(tuid + 3, 4);\r
444 \r
445 traceState = TRACE_IDLE;\r
446\r
447 return 0;\r
448}\r
449\r
450void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
451 uint8_t bt = 0;\r
452 int i;\r
453 \r
454 if (len != 1) {\r
455 for (i = 0; i < len; i++)\r
456 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
457 } else {\r
458 bt = 0; \r
459 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 0)) << 0;\r
460 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 1)) << 1;\r
461 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 2)) << 2;\r
462 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 3)) << 3; \r
463 data[0] = bt;\r
464 }\r
465 return;\r
466}\r
467\r
468int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
469 \r
470 uint8_t data[64];\r
471\r
472 if (traceState == TRACE_ERROR) return 1;\r
473 \r
474 if (len > 64) {\r
475 traceState = TRACE_ERROR;\r
476 return 1;\r
477 }\r
478 \r
479 memcpy(data, data_src, len);\r
480 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
481 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
482 PrintAndLog("dec> %s", sprint_hex(data, len));\r
483 AddLogHex(logHexFileName, "dec> ", data, len); \r
484 }\r
485 \r
486 switch (traceState) {\r
487 case TRACE_IDLE: \r
488 // check packet crc16!\r
489 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
490 PrintAndLog("dec> CRC ERROR!!!");\r
491 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r
492 traceState = TRACE_ERROR; // do not decrypt the next commands\r
493 return 1;\r
494 }\r
495 \r
496 // AUTHENTICATION\r
497 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
498 traceState = TRACE_AUTH1;\r
499 traceCurBlock = data[1];\r
500 traceCurKey = data[0] == 60 ? 1:0;\r
501 return 0;\r
502 }\r
503\r
504 // READ\r
505 if ((len ==4) && ((data[0] == 0x30))) {\r
506 traceState = TRACE_READ_DATA;\r
507 traceCurBlock = data[1];\r
508 return 0;\r
509 }\r
510\r
511 // WRITE\r
512 if ((len ==4) && ((data[0] == 0xA0))) {\r
513 traceState = TRACE_WRITE_OK;\r
514 traceCurBlock = data[1];\r
515 return 0;\r
516 }\r
517\r
518 // HALT\r
519 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
520 traceState = TRACE_ERROR; // do not decrypt the next commands\r
521 return 0;\r
522 }\r
523 \r
524 return 0;\r
525 break;\r
526 \r
527 case TRACE_READ_DATA: \r
528 if (len == 18) {\r
529 traceState = TRACE_IDLE;\r
530\r
531 if (isBlockTrailer(traceCurBlock)) {\r
532 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
533 } else {\r
534 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
535 }\r
536 if (wantSaveToEmlFile) saveTraceCard();\r
537 return 0;\r
538 } else {\r
539 traceState = TRACE_ERROR;\r
540 return 1;\r
541 }\r
542 break;\r
543\r
544 case TRACE_WRITE_OK: \r
545 if ((len == 1) && (data[0] == 0x0a)) {\r
546 traceState = TRACE_WRITE_DATA;\r
547\r
548 return 0;\r
549 } else {\r
550 traceState = TRACE_ERROR;\r
551 return 1;\r
552 }\r
553 break;\r
554\r
555 case TRACE_WRITE_DATA: \r
556 if (len == 18) {\r
557 traceState = TRACE_IDLE;\r
558\r
559 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
560 if (wantSaveToEmlFile) saveTraceCard();\r
561 return 0;\r
562 } else {\r
563 traceState = TRACE_ERROR;\r
564 return 1;\r
565 }\r
566 break;\r
567\r
568 case TRACE_AUTH1: \r
569 if (len == 4) {\r
570 traceState = TRACE_AUTH2;\r
571 nt = bytes_to_num(data, 4);\r
572 return 0;\r
573 } else {\r
574 traceState = TRACE_ERROR;\r
575 return 1;\r
576 }\r
577 break;\r
578\r
579 case TRACE_AUTH2: \r
580 if (len == 8) {\r
581 traceState = TRACE_AUTH_OK;\r
582\r
583 nr_enc = bytes_to_num(data, 4);\r
584 ar_enc = bytes_to_num(data + 4, 4);\r
585 return 0;\r
586 } else {\r
587 traceState = TRACE_ERROR;\r
588 return 1;\r
589 }\r
590 break;\r
591\r
592 case TRACE_AUTH_OK: \r
593 if (len ==4) {\r
594 traceState = TRACE_IDLE;\r
595\r
596 at_enc = bytes_to_num(data, 4);\r
597 \r
598 // decode key here)\r
599 ks2 = ar_enc ^ prng_successor(nt, 64);\r
600 ks3 = at_enc ^ prng_successor(nt, 96);\r
601 revstate = lfsr_recovery64(ks2, ks3);\r
602 lfsr_rollback_word(revstate, 0, 0);\r
603 lfsr_rollback_word(revstate, 0, 0);\r
604 lfsr_rollback_word(revstate, nr_enc, 1);\r
605 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
606\r
607 crypto1_get_lfsr(revstate, &key);\r
608 printf("Key: %012"llx"\n",key);\r
609 AddLogUint64(logHexFileName, "key: ", key); \r
610 \r
611 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
612 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
613 \r
614 if (traceCurKey) {\r
615 num_to_bytes(key, 6, traceCard + blockShift + 10);\r
616 } else {\r
617 num_to_bytes(key, 6, traceCard + blockShift);\r
618 }\r
619 if (wantSaveToEmlFile) saveTraceCard();\r
620\r
621 if (traceCrypto1) {\r
622 crypto1_destroy(traceCrypto1);\r
623 }\r
624 \r
625 // set cryptosystem state\r
626 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
627 \r
628// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
629\r
630 /* traceCrypto1 = crypto1_create(key); // key in lfsr\r
631 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
632 crypto1_word(traceCrypto1, ar, 1);\r
633 crypto1_word(traceCrypto1, 0, 0);\r
634 crypto1_word(traceCrypto1, 0, 0);*/\r
635 \r
636 return 0;\r
637 } else {\r
638 traceState = TRACE_ERROR;\r
639 return 1;\r
640 }\r
641 break;\r
642\r
643 default: \r
644 traceState = TRACE_ERROR;\r
645 return 1;\r
646 }\r
647\r
648 return 0;\r
649}\r
650\r
651int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
652 /*\r
653 uint32_t nt; // tag challenge\r
654 uint32_t nr_enc; // encrypted reader challenge\r
655 uint32_t ar_enc; // encrypted reader response\r
656 uint32_t at_enc; // encrypted tag response\r
657 */\r
658 struct Crypto1State *pcs = NULL;\r
659 \r
660 ks2 = ar_enc ^ prng_successor(nt, 64);\r
661 ks3 = at_enc ^ prng_successor(nt, 96);\r
662 \r
663 PrintAndLog("Decrypting data with:");\r
664 PrintAndLog(" nt: %08x",nt);\r
665 PrintAndLog(" ar_enc: %08x",ar_enc);\r
666 PrintAndLog(" at_enc: %08x",at_enc);\r
667 PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );\r
668\r
669 pcs = lfsr_recovery64(ks2, ks3);\r
670 mf_crypto1_decrypt(pcs, data, len, FALSE);\r
671 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
672 crypto1_destroy(pcs);\r
673 return 0;\r
674}\r
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