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CHG: minor change initializing array.
[proxmark3-svn] / client / mifarehost.c
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b62a5a84 1// Merlok, 2011, 2012\r
f397b5cc
M		 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
55acbb2a 8// mifare commands\r
f397b5cc
M		 9//-----------------------------------------------------------------------------\r
10\r
11#include <stdio.h>\r
873014de 12#include <stdlib.h> \r
31b6e9af 13#include <string.h>\r
9492e0b0 14#include <pthread.h>\r
f397b5cc 15#include "mifarehost.h"\r
902cb3c0 16#include "proxmark3.h"\r
f397b5cc 17\r
55acbb2a 18// MIFARE\r
f397b5cc 19int compar_int(const void * a, const void * b) {\r
9492e0b0 20 // didn't work: (the result is truncated to 32 bits)\r
21 //return (*(uint64_t*)b - *(uint64_t*)a);\r
22\r
23 // better:\r
24 if (*(uint64_t*)b == *(uint64_t*)a) return 0;\r
25 else if (*(uint64_t*)b > *(uint64_t*)a) return 1;\r
26 else return -1;\r
f397b5cc
M		 27}\r
28\r
9492e0b0 29// Compare 16 Bits out of cryptostate\r
30int Compare16Bits(const void * a, const void * b) {\r
31 if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;\r
32 else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;\r
33 else return -1;\r
f397b5cc
M		 34}\r
35\r
9492e0b0 36typedef \r
37 struct {\r
38 union {\r
39 struct Crypto1State *slhead;\r
40 uint64_t *keyhead;\r
3f7c993d 41 } head;\r
9492e0b0 42 union {\r
43 struct Crypto1State *sltail;\r
44 uint64_t *keytail;\r
3f7c993d 45 } tail;\r
9492e0b0 46 uint32_t len;\r
47 uint32_t uid;\r
48 uint32_t blockNo;\r
49 uint32_t keyType;\r
50 uint32_t nt;\r
51 uint32_t ks1;\r
52 } StateList_t;\r
53\r
54\r
55// wrapper function for multi-threaded lfsr_recovery32\r
56void* nested_worker_thread(void *arg)\r
57{\r
58 struct Crypto1State *p1;\r
59 StateList_t *statelist = arg;\r
60\r
3f7c993d 61 statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);\r
62 for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);\r
63 statelist->len = p1 - statelist->head.slhead;\r
64 statelist->tail.sltail = --p1;\r
65 qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\r
f397b5cc 66 \r
3f7c993d 67 return statelist->head.slhead;\r
f397b5cc
M		 68}\r
69\r
9492e0b0 70int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) \r
f397b5cc 71{\r
c830303d 72 uint16_t i;\r
f397b5cc 73 uint32_t uid;\r
902cb3c0 74 UsbCommand resp;\r
c830303d 75\r
9492e0b0 76 StateList_t statelists[2];\r
77 struct Crypto1State *p1, *p2, *p3, *p4;\r
78 \r
f397b5cc 79 // flush queue\r
f397b5cc 80 \r
9492e0b0 81 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
f397b5cc 82 memcpy(c.d.asBytes, key, 6);\r
952f3dc7 83 clearCommandBuffer();\r
9492e0b0 84 SendCommand(&c);\r
f397b5cc 85\r
952f3dc7 86 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) return -1;\r
c830303d 87\r
952f3dc7 88 // error during nested\r
89 if (resp.arg[0]) return resp.arg[0];\r
90 \r
0de8e387 91 memcpy(&uid, resp.d.asBytes, 4);\r
952f3dc7 92 PrintAndLog("UID: %08x Block:%d Key: %c", uid, (uint16_t)resp.arg[2] & 0xff, (resp.arg[2] >> 8) ?'A':'B' );\r
f397b5cc 93 \r
0de8e387 94 for (i = 0; i < 2; i++) {\r
95 statelists[i].blockNo = resp.arg[2] & 0xff;\r
96 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
97 statelists[i].uid = uid;\r
98 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
99 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
100 }\r
f397b5cc 101 \r
f397b5cc 102 // calc keys\r
f397b5cc 103 \r
9492e0b0 104 pthread_t thread_id[2];\r
105 \r
106 // create and run worker threads\r
107 for (i = 0; i < 2; i++) {\r
108 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
f397b5cc
M		 109 }\r
110 \r
9492e0b0 111 // wait for threads to terminate:\r
112 for (i = 0; i < 2; i++) {\r
3f7c993d 113 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
f397b5cc
M		 114 }\r
115\r
f397b5cc 116\r
9492e0b0 117 // the first 16 Bits of the cryptostate already contain part of our key.\r
118 // Create the intersection of the two lists based on these 16 Bits and\r
119 // roll back the cryptostate\r
3f7c993d 120 p1 = p3 = statelists[0].head.slhead; \r
121 p2 = p4 = statelists[1].head.slhead;\r
122 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 123 if (Compare16Bits(p1, p2) == 0) {\r
124 struct Crypto1State savestate, *savep = &savestate;\r
125 savestate = *p1;\r
3f7c993d 126 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
9492e0b0 127 *p3 = *p1;\r
128 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
129 p3++;\r
130 p1++;\r
131 }\r
132 savestate = *p2;\r
3f7c993d 133 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 134 *p4 = *p2;\r
135 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
136 p4++;\r
137 p2++;\r
138 }\r
139 }\r
140 else {\r
141 while (Compare16Bits(p1, p2) == -1) p1++;\r
142 while (Compare16Bits(p1, p2) == 1) p2++;\r
143 }\r
f397b5cc 144 }\r
9492e0b0 145 p3->even = 0; p3->odd = 0;\r
146 p4->even = 0; p4->odd = 0;\r
3f7c993d 147 statelists[0].len = p3 - statelists[0].head.slhead;\r
148 statelists[1].len = p4 - statelists[1].head.slhead;\r
149 statelists[0].tail.sltail=--p3;\r
150 statelists[1].tail.sltail=--p4;\r
9492e0b0 151\r
152 // the statelists now contain possible keys. The key we are searching for must be in the\r
153 // intersection of both lists. Create the intersection:\r
3f7c993d 154 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);\r
155 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);\r
9492e0b0 156\r
157 uint64_t *p5, *p6, *p7;\r
3f7c993d 158 p5 = p7 = statelists[0].head.keyhead; \r
159 p6 = statelists[1].head.keyhead;\r
160 while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {\r
9492e0b0 161 if (compar_int(p5, p6) == 0) {\r
162 *p7++ = *p5++;\r
163 p6++;\r
164 }\r
165 else {\r
166 while (compar_int(p5, p6) == -1) p5++;\r
167 while (compar_int(p5, p6) == 1) p6++;\r
168 }\r
169 }\r
3f7c993d 170 statelists[0].len = p7 - statelists[0].head.keyhead;\r
171 statelists[0].tail.keytail=--p7;\r
9492e0b0 172\r
173 memset(resultKey, 0, 6);\r
174 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
175 for (i = 0; i < statelists[0].len; i++) {\r
176 uint8_t keyBlock[6];\r
177 uint64_t key64;\r
3f7c993d 178 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
9492e0b0 179 num_to_bytes(key64, 6, keyBlock);\r
180 key64 = 0;\r
b10a759f 181 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
9492e0b0 182 num_to_bytes(key64, 6, resultKey);\r
183 break;\r
184 }\r
185 }\r
186 \r
3f7c993d 187 free(statelists[0].head.slhead);\r
0de8e387 188 free(statelists[1].head.slhead); \r
f397b5cc
M		 189 return 0;\r
190}\r
191\r
b10a759f 192int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
9492e0b0 193\r
f397b5cc
M		 194 *key = 0;\r
195\r
b10a759f 196 UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};\r
f397b5cc 197 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
0de8e387 198 \r
199 clearCommandBuffer();\r
9492e0b0 200 SendCommand(&c);\r
902cb3c0 201 UsbCommand resp;\r
202 if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;\r
203 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
204 *key = bytes_to_num(resp.d.asBytes, 6);\r
f397b5cc
M		 205 return 0;\r
206}\r
8556b852 207\r
55acbb2a
M		 208// EMULATOR\r
209\r
8556b852 210int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
545a1f38 211 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
0de8e387 212 clearCommandBuffer();\r
902cb3c0 213 SendCommand(&c);\r
5c065fa0 214 UsbCommand resp;\r
902cb3c0 215 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
216 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
8556b852
M		 217 return 0;\r
218}\r
219\r
220int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
0de8e387 221 return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);\r
222}\r
223\r
224int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {\r
225 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};\r
226 memcpy(c.d.asBytes, data, blocksCount * blockBtWidth); \r
227\r
228 clearCommandBuffer();\r
545a1f38 229 SendCommand(&c);\r
8556b852
M		 230 return 0;\r
231}\r
232\r
55acbb2a
M		 233// "MAGIC" CARD\r
234\r
c2731f37 235int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {\r
3bba7dea 236\r
c2731f37 237 uint8_t params = MAGIC_SINGLE;\r
238 uint8_t block0[16];\r
239 memset(block0, 0x00, sizeof(block0));\r
240 \r
241\r
242 int old = mfCGetBlock(0, block0, params);\r
3bba7dea 243 if (old == 0) {\r
c2731f37 244 PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));\r
80b1b53f 245 } else {\r
3bba7dea
JH		 246 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
247 }\r
248\r
249 // fill in the new values\r
250 // UID\r
251 memcpy(block0, uid, 4); \r
252 // Mifare UID BCC\r
253 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
254 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
c2731f37 255 if ( sak != NULL )\r
3bba7dea 256 block0[5]=sak[0];\r
c2731f37 257 \r
258 if ( atqa != NULL ) {\r
3bba7dea
JH		 259 block0[6]=atqa[1];\r
260 block0[7]=atqa[0];\r
80b1b53f 261 }\r
3bba7dea 262 PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r
c2731f37 263 \r
264 if ( wipecard ) params |= MAGIC_WIPE; \r
265 if ( oldUID == NULL) params |= MAGIC_UID;\r
266 \r
267 return mfCSetBlock(0, block0, oldUID, params);\r
f774db95
M		 268}\r
269\r
c2731f37 270int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {\r
0675f200 271\r
1b492a97 272 uint8_t isOK = 0;\r
c2731f37 273 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};\r
f774db95 274 memcpy(c.d.asBytes, data, 16); \r
0de8e387 275 clearCommandBuffer();\r
276 SendCommand(&c);\r
1b492a97 277 UsbCommand resp;\r
c2731f37 278 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
902cb3c0 279 isOK = resp.arg[0] & 0xff;\r
80b1b53f 280 if (uid != NULL) \r
281 memcpy(uid, resp.d.asBytes, 4);\r
282 if (!isOK) \r
283 return 2;\r
0675f200
M		 284 } else {\r
285 PrintAndLog("Command execute timeout");\r
286 return 1;\r
287 }\r
288 return 0;\r
289}\r
545a1f38
M		 290\r
291int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
292 uint8_t isOK = 0;\r
c2731f37 293 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}}; \r
0de8e387 294 clearCommandBuffer();\r
545a1f38 295 SendCommand(&c);\r
0de8e387 296 UsbCommand resp;\r
902cb3c0 297 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
298 isOK = resp.arg[0] & 0xff;\r
299 memcpy(data, resp.d.asBytes, 16);\r
545a1f38
M		 300 if (!isOK) return 2;\r
301 } else {\r
302 PrintAndLog("Command execute timeout");\r
303 return 1;\r
304 }\r
305 return 0;\r
306}\r
55acbb2a
M		 307\r
308// SNIFFER\r
309\r
e0c635d1
M		 310// constants\r
311static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
312\r
55acbb2a 313// variables\r
e4691591 314char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
e0c635d1 315static uint8_t traceCard[4096] = {0x00};\r
e4691591 316static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
55acbb2a
M		 317static int traceState = TRACE_IDLE;\r
318static uint8_t traceCurBlock = 0;\r
319static uint8_t traceCurKey = 0;\r
320\r
321struct Crypto1State *traceCrypto1 = NULL;\r
322\r
046fd766 323struct Crypto1State *revstate = NULL;\r
324\r
325uint64_t key = 0;\r
326uint32_t ks2 = 0;\r
327uint32_t ks3 = 0;\r
55acbb2a 328\r
046fd766 329uint32_t uid = 0; // serial number\r
330uint32_t nt =0; // tag challenge\r
331uint32_t nr_enc =0; // encrypted reader challenge\r
332uint32_t ar_enc =0; // encrypted reader response\r
333uint32_t at_enc =0; // encrypted tag response\r
55acbb2a 334\r
e0c635d1
M		 335int isTraceCardEmpty(void) {\r
336 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
337}\r
55acbb2a 338\r
e0c635d1
M		 339int isBlockEmpty(int blockN) {\r
340 for (int i = 0; i < 16; i++) \r
341 if (traceCard[blockN * 16 + i] != 0) return 0;\r
55acbb2a 342\r
e0c635d1
M		 343 return 1;\r
344}\r
345\r
346int isBlockTrailer(int blockN) {\r
347 return ((blockN & 0x03) == 0x03);\r
348}\r
349\r
350int loadTraceCard(uint8_t *tuid) {\r
351 FILE * f;\r
80b1b53f 352 char buf[64] = {0x00};\r
353 uint8_t buf8[64] = {0x00};\r
e0c635d1
M		 354 int i, blockNum;\r
355 \r
80b1b53f 356 if (!isTraceCardEmpty()) \r
357 saveTraceCard();\r
358 \r
55acbb2a
M		 359 memset(traceCard, 0x00, 4096);\r
360 memcpy(traceCard, tuid + 3, 4);\r
80b1b53f 361\r
e0c635d1
M		 362 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
363\r
364 f = fopen(traceFileName, "r");\r
664bb5ae 365 if (!f) return 1;\r
e0c635d1
M		 366 \r
367 blockNum = 0;\r
e4691591 368 \r
e0c635d1 369 while(!feof(f)){\r
e4691591 370 \r
e0c635d1 371 memset(buf, 0, sizeof(buf));\r
759c16b3 372 if (fgets(buf, sizeof(buf), f) == NULL) {\r
046fd766 373 PrintAndLog("File reading error.");\r
1b492a97 374 fclose(f);\r
759c16b3 375 return 2;\r
046fd766 376 }\r
e0c635d1
M		 377\r
378 if (strlen(buf) < 32){\r
379 if (feof(f)) break;\r
380 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
1b492a97 381 fclose(f);\r
e0c635d1
M		 382 return 2;\r
383 }\r
384 for (i = 0; i < 32; i += 2)\r
385 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
386\r
387 memcpy(traceCard + blockNum * 16, buf8, 16);\r
388\r
389 blockNum++;\r
390 }\r
391 fclose(f);\r
392\r
393 return 0;\r
394}\r
395\r
396int saveTraceCard(void) {\r
397 FILE * f;\r
398 \r
399 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
400 \r
401 f = fopen(traceFileName, "w+");\r
664bb5ae 402 if ( !f ) return 1;\r
e4691591 403 \r
e0c635d1
M		 404 for (int i = 0; i < 64; i++) { // blocks\r
405 for (int j = 0; j < 16; j++) // bytes\r
406 fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
407 fprintf(f,"\n");\r
408 }\r
409 fclose(f);\r
e0c635d1
M		 410 return 0;\r
411}\r
412\r
413int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
414\r
80b1b53f 415 if (traceCrypto1) \r
416 crypto1_destroy(traceCrypto1);\r
417\r
e0c635d1
M		 418 traceCrypto1 = NULL;\r
419\r
80b1b53f 420 if (wantSaveToEmlFile) \r
421 loadTraceCard(tuid);\r
422 \r
55acbb2a
M		 423 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
424 traceCard[5] = sak;\r
425 memcpy(&traceCard[6], atqa, 2);\r
426 traceCurBlock = 0;\r
427 uid = bytes_to_num(tuid + 3, 4);\r
428 \r
429 traceState = TRACE_IDLE;\r
430\r
431 return 0;\r
432}\r
433\r
434void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
435 uint8_t bt = 0;\r
436 int i;\r
437 \r
438 if (len != 1) {\r
439 for (i = 0; i < len; i++)\r
440 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
441 } else {\r
442 bt = 0;\r
443 for (i = 0; i < 4; i++)\r
444 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r
445 \r
446 data[0] = bt;\r
447 }\r
448 return;\r
449}\r
450\r
451\r
a501c82b 452int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
55acbb2a
M		 453 uint8_t data[64];\r
454\r
455 if (traceState == TRACE_ERROR) return 1;\r
456 if (len > 64) {\r
457 traceState = TRACE_ERROR;\r
458 return 1;\r
459 }\r
460 \r
461 memcpy(data, data_src, len);\r
462 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
463 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
464 PrintAndLog("dec> %s", sprint_hex(data, len));\r
465 AddLogHex(logHexFileName, "dec> ", data, len); \r
466 }\r
467 \r
468 switch (traceState) {\r
469 case TRACE_IDLE: \r
8b6a93df
M		 470 // check packet crc16!\r
471 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
472 PrintAndLog("dec> CRC ERROR!!!");\r
473 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r
474 traceState = TRACE_ERROR; // do not decrypt the next commands\r
475 return 1;\r
476 }\r
55acbb2a
M		 477 \r
478 // AUTHENTICATION\r
a61b4976 479 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
55acbb2a
M		 480 traceState = TRACE_AUTH1;\r
481 traceCurBlock = data[1];\r
482 traceCurKey = data[0] == 60 ? 1:0;\r
483 return 0;\r
484 }\r
485\r
486 // READ\r
487 if ((len ==4) && ((data[0] == 0x30))) {\r
488 traceState = TRACE_READ_DATA;\r
489 traceCurBlock = data[1];\r
490 return 0;\r
491 }\r
492\r
493 // WRITE\r
494 if ((len ==4) && ((data[0] == 0xA0))) {\r
495 traceState = TRACE_WRITE_OK;\r
496 traceCurBlock = data[1];\r
497 return 0;\r
498 }\r
499\r
500 // HALT\r
501 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
502 traceState = TRACE_ERROR; // do not decrypt the next commands\r
503 return 0;\r
504 }\r
505 \r
506 return 0;\r
507 break;\r
508 \r
509 case TRACE_READ_DATA: \r
510 if (len == 18) {\r
511 traceState = TRACE_IDLE;\r
512\r
e0c635d1
M		 513 if (isBlockTrailer(traceCurBlock)) {\r
514 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
515 } else {\r
516 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
517 }\r
518 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 519 return 0;\r
520 } else {\r
521 traceState = TRACE_ERROR;\r
522 return 1;\r
523 }\r
524 break;\r
525\r
526 case TRACE_WRITE_OK: \r
a61b4976 527 if ((len == 1) && (data[0] == 0x0a)) {\r
55acbb2a
M		 528 traceState = TRACE_WRITE_DATA;\r
529\r
530 return 0;\r
531 } else {\r
532 traceState = TRACE_ERROR;\r
533 return 1;\r
534 }\r
535 break;\r
536\r
537 case TRACE_WRITE_DATA: \r
538 if (len == 18) {\r
539 traceState = TRACE_IDLE;\r
540\r
541 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
e0c635d1 542 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 543 return 0;\r
544 } else {\r
545 traceState = TRACE_ERROR;\r
546 return 1;\r
547 }\r
548 break;\r
549\r
550 case TRACE_AUTH1: \r
551 if (len == 4) {\r
552 traceState = TRACE_AUTH2;\r
55acbb2a
M		 553 nt = bytes_to_num(data, 4);\r
554 return 0;\r
555 } else {\r
556 traceState = TRACE_ERROR;\r
557 return 1;\r
558 }\r
559 break;\r
560\r
561 case TRACE_AUTH2: \r
562 if (len == 8) {\r
563 traceState = TRACE_AUTH_OK;\r
564\r
565 nr_enc = bytes_to_num(data, 4);\r
566 ar_enc = bytes_to_num(data + 4, 4);\r
567 return 0;\r
568 } else {\r
569 traceState = TRACE_ERROR;\r
570 return 1;\r
571 }\r
572 break;\r
573\r
574 case TRACE_AUTH_OK: \r
575 if (len ==4) {\r
576 traceState = TRACE_IDLE;\r
577\r
578 at_enc = bytes_to_num(data, 4);\r
579 \r
580 // decode key here)\r
a61b4976 581 ks2 = ar_enc ^ prng_successor(nt, 64);\r
582 ks3 = at_enc ^ prng_successor(nt, 96);\r
583 revstate = lfsr_recovery64(ks2, ks3);\r
584 lfsr_rollback_word(revstate, 0, 0);\r
585 lfsr_rollback_word(revstate, 0, 0);\r
586 lfsr_rollback_word(revstate, nr_enc, 1);\r
587 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
588\r
046fd766 589 crypto1_get_lfsr(revstate, &key);\r
590 printf("Key: %012"llx"\n",key);\r
591 AddLogUint64(logHexFileName, "key: ", key); \r
55acbb2a 592 \r
e0c635d1
M		 593 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
594 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
595 \r
55acbb2a 596 if (traceCurKey) {\r
046fd766 597 num_to_bytes(key, 6, traceCard + blockShift + 10);\r
55acbb2a 598 } else {\r
046fd766 599 num_to_bytes(key, 6, traceCard + blockShift);\r
55acbb2a 600 }\r
e0c635d1 601 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 602\r
603 if (traceCrypto1) {\r
604 crypto1_destroy(traceCrypto1);\r
605 }\r
606 \r
607 // set cryptosystem state\r
608 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
609 \r
610// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
611\r
046fd766 612 /* traceCrypto1 = crypto1_create(key); // key in lfsr\r
55acbb2a
M		 613 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
614 crypto1_word(traceCrypto1, ar, 1);\r
615 crypto1_word(traceCrypto1, 0, 0);\r
616 crypto1_word(traceCrypto1, 0, 0);*/\r
617 \r
618 return 0;\r
619 } else {\r
620 traceState = TRACE_ERROR;\r
621 return 1;\r
622 }\r
623 break;\r
624\r
625 default: \r
626 traceState = TRACE_ERROR;\r
627 return 1;\r
628 }\r
629\r
630 return 0;\r
631}\r
e98572a1 632\r
633int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
634 /*\r
635 uint32_t nt; // tag challenge\r
3bc7b13d 636 uint32_t nr_enc; // encrypted reader challenge\r
e98572a1 637 uint32_t ar_enc; // encrypted reader response\r
638 uint32_t at_enc; // encrypted tag response\r
639 */\r
3bc7b13d 640\r
641 struct Crypto1State *pcs = NULL;\r
642 \r
e98572a1 643 ks2 = ar_enc ^ prng_successor(nt, 64);\r
644 ks3 = at_enc ^ prng_successor(nt, 96);\r
3bc7b13d 645 \r
646 PrintAndLog("Decrypting data with:");\r
647 PrintAndLog(" nt: %08x",nt);\r
648 PrintAndLog(" ar_enc: %08x",ar_enc);\r
649 PrintAndLog(" at_enc: %08x",at_enc);\r
650 PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );\r
651\r
652 pcs = lfsr_recovery64(ks2, ks3);\r
653 mf_crypto1_decrypt(pcs, data, len, FALSE);\r
e98572a1 654 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
3bc7b13d 655 crypto1_destroy(pcs);\r
e98572a1 656 return 0;\r
657}\r
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