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CHG: changed output for the "hf mf nested" to show KEY: A or B instead of 0/1
[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\r
18#define llx PRIx64\r
19\r
20// MIFARE\r
21int compar_int(const void * a, const void * b) {\r
22 // didn't work: (the result is truncated to 32 bits)\r
23 //return (*(uint64_t*)b - *(uint64_t*)a);\r
24\r
25 // better:\r
26 if (*(uint64_t*)b == *(uint64_t*)a) return 0;\r
27 else if (*(uint64_t*)b > *(uint64_t*)a) return 1;\r
28 else return -1;\r
29}\r
30\r
31// Compare 16 Bits out of cryptostate\r
32int Compare16Bits(const void * a, const void * b) {\r
33 if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;\r
34 else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;\r
35 else return -1;\r
36}\r
37\r
38typedef \r
39 struct {\r
40 union {\r
41 struct Crypto1State *slhead;\r
42 uint64_t *keyhead;\r
43 } head;\r
44 union {\r
45 struct Crypto1State *sltail;\r
46 uint64_t *keytail;\r
47 } tail;\r
48 uint32_t len;\r
49 uint32_t uid;\r
50 uint32_t blockNo;\r
51 uint32_t keyType;\r
52 uint32_t nt;\r
53 uint32_t ks1;\r
54 } StateList_t;\r
55\r
56\r
57// wrapper function for multi-threaded lfsr_recovery32\r
58void* nested_worker_thread(void *arg)\r
59{\r
60 struct Crypto1State *p1;\r
61 StateList_t *statelist = arg;\r
62\r
63 statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);\r
64 for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);\r
65 statelist->len = p1 - statelist->head.slhead;\r
66 statelist->tail.sltail = --p1;\r
67 qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\r
68 \r
69 return statelist->head.slhead;\r
70}\r
71\r
72int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) \r
73{\r
74 uint16_t i;\r
75 uint32_t uid;\r
76 UsbCommand resp;\r
77\r
78 StateList_t statelists[2];\r
79 struct Crypto1State *p1, *p2, *p3, *p4;\r
80 \r
81 // flush queue\r
82 \r
83 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
84 memcpy(c.d.asBytes, key, 6);\r
85 clearCommandBuffer();\r
86 SendCommand(&c);\r
87\r
88 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) return -1;\r
89\r
90 // error during nested\r
91 if (resp.arg[0]) return resp.arg[0];\r
92 \r
93 memcpy(&uid, resp.d.asBytes, 4);\r
94 PrintAndLog("UID: %08x Block:%d Key: %c", uid, (uint16_t)resp.arg[2] & 0xff, (resp.arg[2] >> 8) ?'A':'B' );\r
95 \r
96 for (i = 0; i < 2; i++) {\r
97 statelists[i].blockNo = resp.arg[2] & 0xff;\r
98 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
99 statelists[i].uid = uid;\r
100 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
101 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
102 }\r
103 \r
104 // calc keys\r
105 \r
106 pthread_t thread_id[2];\r
107 \r
108 // create and run worker threads\r
109 for (i = 0; i < 2; i++) {\r
110 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
111 }\r
112 \r
113 // wait for threads to terminate:\r
114 for (i = 0; i < 2; i++) {\r
115 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
116 }\r
117\r
118\r
119 // the first 16 Bits of the cryptostate already contain part of our key.\r
120 // Create the intersection of the two lists based on these 16 Bits and\r
121 // roll back the cryptostate\r
122 p1 = p3 = statelists[0].head.slhead; \r
123 p2 = p4 = statelists[1].head.slhead;\r
124 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
125 if (Compare16Bits(p1, p2) == 0) {\r
126 struct Crypto1State savestate, *savep = &savestate;\r
127 savestate = *p1;\r
128 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
129 *p3 = *p1;\r
130 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
131 p3++;\r
132 p1++;\r
133 }\r
134 savestate = *p2;\r
135 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
136 *p4 = *p2;\r
137 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
138 p4++;\r
139 p2++;\r
140 }\r
141 }\r
142 else {\r
143 while (Compare16Bits(p1, p2) == -1) p1++;\r
144 while (Compare16Bits(p1, p2) == 1) p2++;\r
145 }\r
146 }\r
147 p3->even = 0; p3->odd = 0;\r
148 p4->even = 0; p4->odd = 0;\r
149 statelists[0].len = p3 - statelists[0].head.slhead;\r
150 statelists[1].len = p4 - statelists[1].head.slhead;\r
151 statelists[0].tail.sltail=--p3;\r
152 statelists[1].tail.sltail=--p4;\r
153\r
154 // the statelists now contain possible keys. The key we are searching for must be in the\r
155 // intersection of both lists. Create the intersection:\r
156 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);\r
157 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);\r
158\r
159 uint64_t *p5, *p6, *p7;\r
160 p5 = p7 = statelists[0].head.keyhead; \r
161 p6 = statelists[1].head.keyhead;\r
162 while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {\r
163 if (compar_int(p5, p6) == 0) {\r
164 *p7++ = *p5++;\r
165 p6++;\r
166 }\r
167 else {\r
168 while (compar_int(p5, p6) == -1) p5++;\r
169 while (compar_int(p5, p6) == 1) p6++;\r
170 }\r
171 }\r
172 statelists[0].len = p7 - statelists[0].head.keyhead;\r
173 statelists[0].tail.keytail=--p7;\r
174\r
175 memset(resultKey, 0, 6);\r
176 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
177 for (i = 0; i < statelists[0].len; i++) {\r
178 uint8_t keyBlock[6];\r
179 uint64_t key64;\r
180 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
181 num_to_bytes(key64, 6, keyBlock);\r
182 key64 = 0;\r
183 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
184 num_to_bytes(key64, 6, resultKey);\r
185 break;\r
186 }\r
187 }\r
188 \r
189 free(statelists[0].head.slhead);\r
190 free(statelists[1].head.slhead); \r
191 return 0;\r
192}\r
193\r
194int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
195\r
196 *key = 0;\r
197\r
198 UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};\r
199 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
200 \r
201 clearCommandBuffer();\r
202 SendCommand(&c);\r
203 UsbCommand resp;\r
204 if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;\r
205 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
206 *key = bytes_to_num(resp.d.asBytes, 6);\r
207 return 0;\r
208}\r
209\r
210// EMULATOR\r
211\r
212int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
213 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
214 clearCommandBuffer();\r
215 SendCommand(&c);\r
216 UsbCommand resp;\r
217 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
218 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
219 return 0;\r
220}\r
221\r
222int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
223 return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);\r
224}\r
225\r
226int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {\r
227 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};\r
228 memcpy(c.d.asBytes, data, blocksCount * blockBtWidth); \r
229\r
230 clearCommandBuffer();\r
231 SendCommand(&c);\r
232 return 0;\r
233}\r
234\r
235// "MAGIC" CARD\r
236\r
237int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {\r
238\r
239 uint8_t params = MAGIC_SINGLE;\r
240 uint8_t block0[16];\r
241 memset(block0, 0x00, sizeof(block0));\r
242 \r
243\r
244 int old = mfCGetBlock(0, block0, params);\r
245 if (old == 0) {\r
246 PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));\r
247 } else {\r
248 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
249 }\r
250\r
251 // fill in the new values\r
252 // UID\r
253 memcpy(block0, uid, 4); \r
254 // Mifare UID BCC\r
255 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
256 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
257 if ( sak != NULL )\r
258 block0[5]=sak[0];\r
259 \r
260 if ( atqa != NULL ) {\r
261 block0[6]=atqa[1];\r
262 block0[7]=atqa[0];\r
263 }\r
264 PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r
265 \r
266 if ( wipecard ) params |= MAGIC_WIPE; \r
267 if ( oldUID == NULL) params |= MAGIC_UID;\r
268 \r
269 return mfCSetBlock(0, block0, oldUID, params);\r
270}\r
271\r
272int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {\r
273\r
274 uint8_t isOK = 0;\r
275 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};\r
276 memcpy(c.d.asBytes, data, 16); \r
277 clearCommandBuffer();\r
278 SendCommand(&c);\r
279 UsbCommand resp;\r
280 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
281 isOK = resp.arg[0] & 0xff;\r
282 if (uid != NULL) \r
283 memcpy(uid, resp.d.asBytes, 4);\r
284 if (!isOK) \r
285 return 2;\r
286 } else {\r
287 PrintAndLog("Command execute timeout");\r
288 return 1;\r
289 }\r
290 return 0;\r
291}\r
292\r
293int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
294 uint8_t isOK = 0;\r
295 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}}; \r
296 clearCommandBuffer();\r
297 SendCommand(&c);\r
298 UsbCommand resp;\r
299 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
300 isOK = resp.arg[0] & 0xff;\r
301 memcpy(data, resp.d.asBytes, 16);\r
302 if (!isOK) return 2;\r
303 } else {\r
304 PrintAndLog("Command execute timeout");\r
305 return 1;\r
306 }\r
307 return 0;\r
308}\r
309\r
310// SNIFFER\r
311\r
312// constants\r
313static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
314\r
315// variables\r
316char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
317static uint8_t traceCard[4096] = {0x00};\r
318static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
319static int traceState = TRACE_IDLE;\r
320static uint8_t traceCurBlock = 0;\r
321static uint8_t traceCurKey = 0;\r
322\r
323struct Crypto1State *traceCrypto1 = NULL;\r
324\r
325struct Crypto1State *revstate = NULL;\r
326\r
327uint64_t key = 0;\r
328uint32_t ks2 = 0;\r
329uint32_t ks3 = 0;\r
330\r
331uint32_t uid = 0; // serial number\r
332uint32_t nt =0; // tag challenge\r
333uint32_t nr_enc =0; // encrypted reader challenge\r
334uint32_t ar_enc =0; // encrypted reader response\r
335uint32_t at_enc =0; // encrypted tag response\r
336\r
337int isTraceCardEmpty(void) {\r
338 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
339}\r
340\r
341int isBlockEmpty(int blockN) {\r
342 for (int i = 0; i < 16; i++) \r
343 if (traceCard[blockN * 16 + i] != 0) return 0;\r
344\r
345 return 1;\r
346}\r
347\r
348int isBlockTrailer(int blockN) {\r
349 return ((blockN & 0x03) == 0x03);\r
350}\r
351\r
352int loadTraceCard(uint8_t *tuid) {\r
353 FILE * f;\r
354 char buf[64] = {0x00};\r
355 uint8_t buf8[64] = {0x00};\r
356 int i, blockNum;\r
357 \r
358 if (!isTraceCardEmpty()) \r
359 saveTraceCard();\r
360 \r
361 memset(traceCard, 0x00, 4096);\r
362 memcpy(traceCard, tuid + 3, 4);\r
363\r
364 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
365\r
366 f = fopen(traceFileName, "r");\r
367 if (!f) return 1;\r
368 \r
369 blockNum = 0;\r
370 \r
371 while(!feof(f)){\r
372 \r
373 memset(buf, 0, sizeof(buf));\r
374 if (fgets(buf, sizeof(buf), f) == NULL) {\r
375 PrintAndLog("File reading error.");\r
376 fclose(f);\r
377 return 2;\r
378 }\r
379\r
380 if (strlen(buf) < 32){\r
381 if (feof(f)) break;\r
382 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
383 fclose(f);\r
384 return 2;\r
385 }\r
386 for (i = 0; i < 32; i += 2)\r
387 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
388\r
389 memcpy(traceCard + blockNum * 16, buf8, 16);\r
390\r
391 blockNum++;\r
392 }\r
393 fclose(f);\r
394\r
395 return 0;\r
396}\r
397\r
398int saveTraceCard(void) {\r
399 FILE * f;\r
400 \r
401 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
402 \r
403 f = fopen(traceFileName, "w+");\r
404 if ( !f ) return 1;\r
405 \r
406 for (int i = 0; i < 64; i++) { // blocks\r
407 for (int j = 0; j < 16; j++) // bytes\r
408 fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
409 fprintf(f,"\n");\r
410 }\r
411 fclose(f);\r
412 return 0;\r
413}\r
414\r
415int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
416\r
417 if (traceCrypto1) \r
418 crypto1_destroy(traceCrypto1);\r
419\r
420 traceCrypto1 = NULL;\r
421\r
422 if (wantSaveToEmlFile) \r
423 loadTraceCard(tuid);\r
424 \r
425 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
426 traceCard[5] = sak;\r
427 memcpy(&traceCard[6], atqa, 2);\r
428 traceCurBlock = 0;\r
429 uid = bytes_to_num(tuid + 3, 4);\r
430 \r
431 traceState = TRACE_IDLE;\r
432\r
433 return 0;\r
434}\r
435\r
436void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
437 uint8_t bt = 0;\r
438 int i;\r
439 \r
440 if (len != 1) {\r
441 for (i = 0; i < len; i++)\r
442 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
443 } else {\r
444 bt = 0;\r
445 for (i = 0; i < 4; i++)\r
446 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r
447 \r
448 data[0] = bt;\r
449 }\r
450 return;\r
451}\r
452\r
453\r
454int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
455 uint8_t data[64];\r
456\r
457 if (traceState == TRACE_ERROR) return 1;\r
458 if (len > 64) {\r
459 traceState = TRACE_ERROR;\r
460 return 1;\r
461 }\r
462 \r
463 memcpy(data, data_src, len);\r
464 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
465 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
466 PrintAndLog("dec> %s", sprint_hex(data, len));\r
467 AddLogHex(logHexFileName, "dec> ", data, len); \r
468 }\r
469 \r
470 switch (traceState) {\r
471 case TRACE_IDLE: \r
472 // check packet crc16!\r
473 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
474 PrintAndLog("dec> CRC ERROR!!!");\r
475 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r
476 traceState = TRACE_ERROR; // do not decrypt the next commands\r
477 return 1;\r
478 }\r
479 \r
480 // AUTHENTICATION\r
481 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
482 traceState = TRACE_AUTH1;\r
483 traceCurBlock = data[1];\r
484 traceCurKey = data[0] == 60 ? 1:0;\r
485 return 0;\r
486 }\r
487\r
488 // READ\r
489 if ((len ==4) && ((data[0] == 0x30))) {\r
490 traceState = TRACE_READ_DATA;\r
491 traceCurBlock = data[1];\r
492 return 0;\r
493 }\r
494\r
495 // WRITE\r
496 if ((len ==4) && ((data[0] == 0xA0))) {\r
497 traceState = TRACE_WRITE_OK;\r
498 traceCurBlock = data[1];\r
499 return 0;\r
500 }\r
501\r
502 // HALT\r
503 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
504 traceState = TRACE_ERROR; // do not decrypt the next commands\r
505 return 0;\r
506 }\r
507 \r
508 return 0;\r
509 break;\r
510 \r
511 case TRACE_READ_DATA: \r
512 if (len == 18) {\r
513 traceState = TRACE_IDLE;\r
514\r
515 if (isBlockTrailer(traceCurBlock)) {\r
516 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
517 } else {\r
518 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
519 }\r
520 if (wantSaveToEmlFile) saveTraceCard();\r
521 return 0;\r
522 } else {\r
523 traceState = TRACE_ERROR;\r
524 return 1;\r
525 }\r
526 break;\r
527\r
528 case TRACE_WRITE_OK: \r
529 if ((len == 1) && (data[0] == 0x0a)) {\r
530 traceState = TRACE_WRITE_DATA;\r
531\r
532 return 0;\r
533 } else {\r
534 traceState = TRACE_ERROR;\r
535 return 1;\r
536 }\r
537 break;\r
538\r
539 case TRACE_WRITE_DATA: \r
540 if (len == 18) {\r
541 traceState = TRACE_IDLE;\r
542\r
543 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
544 if (wantSaveToEmlFile) saveTraceCard();\r
545 return 0;\r
546 } else {\r
547 traceState = TRACE_ERROR;\r
548 return 1;\r
549 }\r
550 break;\r
551\r
552 case TRACE_AUTH1: \r
553 if (len == 4) {\r
554 traceState = TRACE_AUTH2;\r
555 nt = bytes_to_num(data, 4);\r
556 return 0;\r
557 } else {\r
558 traceState = TRACE_ERROR;\r
559 return 1;\r
560 }\r
561 break;\r
562\r
563 case TRACE_AUTH2: \r
564 if (len == 8) {\r
565 traceState = TRACE_AUTH_OK;\r
566\r
567 nr_enc = bytes_to_num(data, 4);\r
568 ar_enc = bytes_to_num(data + 4, 4);\r
569 return 0;\r
570 } else {\r
571 traceState = TRACE_ERROR;\r
572 return 1;\r
573 }\r
574 break;\r
575\r
576 case TRACE_AUTH_OK: \r
577 if (len ==4) {\r
578 traceState = TRACE_IDLE;\r
579\r
580 at_enc = bytes_to_num(data, 4);\r
581 \r
582 // decode key here)\r
583 ks2 = ar_enc ^ prng_successor(nt, 64);\r
584 ks3 = at_enc ^ prng_successor(nt, 96);\r
585 revstate = lfsr_recovery64(ks2, ks3);\r
586 lfsr_rollback_word(revstate, 0, 0);\r
587 lfsr_rollback_word(revstate, 0, 0);\r
588 lfsr_rollback_word(revstate, nr_enc, 1);\r
589 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
590\r
591 crypto1_get_lfsr(revstate, &key);\r
592 printf("Key: %012"llx"\n",key);\r
593 AddLogUint64(logHexFileName, "key: ", key); \r
594 \r
595 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
596 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
597 \r
598 if (traceCurKey) {\r
599 num_to_bytes(key, 6, traceCard + blockShift + 10);\r
600 } else {\r
601 num_to_bytes(key, 6, traceCard + blockShift);\r
602 }\r
603 if (wantSaveToEmlFile) saveTraceCard();\r
604\r
605 if (traceCrypto1) {\r
606 crypto1_destroy(traceCrypto1);\r
607 }\r
608 \r
609 // set cryptosystem state\r
610 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
611 \r
612// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
613\r
614 /* traceCrypto1 = crypto1_create(key); // key in lfsr\r
615 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
616 crypto1_word(traceCrypto1, ar, 1);\r
617 crypto1_word(traceCrypto1, 0, 0);\r
618 crypto1_word(traceCrypto1, 0, 0);*/\r
619 \r
620 return 0;\r
621 } else {\r
622 traceState = TRACE_ERROR;\r
623 return 1;\r
624 }\r
625 break;\r
626\r
627 default: \r
628 traceState = TRACE_ERROR;\r
629 return 1;\r
630 }\r
631\r
632 return 0;\r
633}\r
634\r
635int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
636 /*\r
637 uint32_t nt; // tag challenge\r
638 uint32_t nr_enc; // encrypted reader challenge\r
639 uint32_t ar_enc; // encrypted reader response\r
640 uint32_t at_enc; // encrypted tag response\r
641 */\r
642\r
643 struct Crypto1State *pcs = NULL;\r
644 \r
645 ks2 = ar_enc ^ prng_successor(nt, 64);\r
646 ks3 = at_enc ^ prng_successor(nt, 96);\r
647 \r
648 PrintAndLog("Decrypting data with:");\r
649 PrintAndLog(" nt: %08x",nt);\r
650 PrintAndLog(" ar_enc: %08x",ar_enc);\r
651 PrintAndLog(" at_enc: %08x",at_enc);\r
652 PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );\r
653\r
654 pcs = lfsr_recovery64(ks2, ks3);\r
655 mf_crypto1_decrypt(pcs, data, len, FALSE);\r
656 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
657 crypto1_destroy(pcs);\r
658 return 0;\r
659}\r
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