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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
046fd766 18#define llx PRIx64\r
19\r
55acbb2a 20// MIFARE\r
f397b5cc 21int compar_int(const void * a, const void * b) {\r
9492e0b0 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
f397b5cc
M		 29}\r
30\r
9492e0b0 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
f397b5cc
M		 36}\r
37\r
9492e0b0 38typedef \r
39 struct {\r
40 union {\r
41 struct Crypto1State *slhead;\r
42 uint64_t *keyhead;\r
3f7c993d 43 } head;\r
9492e0b0 44 union {\r
45 struct Crypto1State *sltail;\r
46 uint64_t *keytail;\r
3f7c993d 47 } tail;\r
9492e0b0 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
3f7c993d 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
f397b5cc 68 \r
3f7c993d 69 return statelist->head.slhead;\r
f397b5cc
M		 70}\r
71\r
9492e0b0 72int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) \r
f397b5cc 73{\r
c830303d 74 uint16_t i;\r
f397b5cc 75 uint32_t uid;\r
902cb3c0 76 UsbCommand resp;\r
c830303d 77\r
9492e0b0 78 StateList_t statelists[2];\r
79 struct Crypto1State *p1, *p2, *p3, *p4;\r
80 \r
f397b5cc 81 // flush queue\r
7dd1908b 82 WaitForResponseTimeout(CMD_ACK,NULL,100);\r
f397b5cc 83 \r
9492e0b0 84 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
f397b5cc 85 memcpy(c.d.asBytes, key, 6);\r
9492e0b0 86 SendCommand(&c);\r
f397b5cc 87\r
c830303d 88 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
89 return -1;\r
90 }\r
91\r
92 if (resp.arg[0]) {\r
93 return resp.arg[0]; // error during nested\r
94 }\r
95 \r
0de8e387 96 memcpy(&uid, resp.d.asBytes, 4);\r
c830303d 97 PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r
f397b5cc 98 \r
0de8e387 99 for (i = 0; i < 2; i++) {\r
100 statelists[i].blockNo = resp.arg[2] & 0xff;\r
101 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
102 statelists[i].uid = uid;\r
103 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
104 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
105 }\r
f397b5cc 106 \r
f397b5cc 107 // calc keys\r
f397b5cc 108 \r
9492e0b0 109 pthread_t thread_id[2];\r
110 \r
111 // create and run worker threads\r
112 for (i = 0; i < 2; i++) {\r
113 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
f397b5cc
M		 114 }\r
115 \r
9492e0b0 116 // wait for threads to terminate:\r
117 for (i = 0; i < 2; i++) {\r
3f7c993d 118 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
f397b5cc
M		 119 }\r
120\r
f397b5cc 121\r
9492e0b0 122 // the first 16 Bits of the cryptostate already contain part of our key.\r
123 // Create the intersection of the two lists based on these 16 Bits and\r
124 // roll back the cryptostate\r
3f7c993d 125 p1 = p3 = statelists[0].head.slhead; \r
126 p2 = p4 = statelists[1].head.slhead;\r
127 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 128 if (Compare16Bits(p1, p2) == 0) {\r
129 struct Crypto1State savestate, *savep = &savestate;\r
130 savestate = *p1;\r
3f7c993d 131 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
9492e0b0 132 *p3 = *p1;\r
133 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
134 p3++;\r
135 p1++;\r
136 }\r
137 savestate = *p2;\r
3f7c993d 138 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 139 *p4 = *p2;\r
140 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
141 p4++;\r
142 p2++;\r
143 }\r
144 }\r
145 else {\r
146 while (Compare16Bits(p1, p2) == -1) p1++;\r
147 while (Compare16Bits(p1, p2) == 1) p2++;\r
148 }\r
f397b5cc 149 }\r
9492e0b0 150 p3->even = 0; p3->odd = 0;\r
151 p4->even = 0; p4->odd = 0;\r
3f7c993d 152 statelists[0].len = p3 - statelists[0].head.slhead;\r
153 statelists[1].len = p4 - statelists[1].head.slhead;\r
154 statelists[0].tail.sltail=--p3;\r
155 statelists[1].tail.sltail=--p4;\r
9492e0b0 156\r
157 // the statelists now contain possible keys. The key we are searching for must be in the\r
158 // intersection of both lists. Create the intersection:\r
3f7c993d 159 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);\r
160 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);\r
9492e0b0 161\r
162 uint64_t *p5, *p6, *p7;\r
3f7c993d 163 p5 = p7 = statelists[0].head.keyhead; \r
164 p6 = statelists[1].head.keyhead;\r
165 while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {\r
9492e0b0 166 if (compar_int(p5, p6) == 0) {\r
167 *p7++ = *p5++;\r
168 p6++;\r
169 }\r
170 else {\r
171 while (compar_int(p5, p6) == -1) p5++;\r
172 while (compar_int(p5, p6) == 1) p6++;\r
173 }\r
174 }\r
3f7c993d 175 statelists[0].len = p7 - statelists[0].head.keyhead;\r
176 statelists[0].tail.keytail=--p7;\r
9492e0b0 177\r
178 memset(resultKey, 0, 6);\r
179 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
180 for (i = 0; i < statelists[0].len; i++) {\r
181 uint8_t keyBlock[6];\r
182 uint64_t key64;\r
3f7c993d 183 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
9492e0b0 184 num_to_bytes(key64, 6, keyBlock);\r
185 key64 = 0;\r
b10a759f 186 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
9492e0b0 187 num_to_bytes(key64, 6, resultKey);\r
188 break;\r
189 }\r
190 }\r
191 \r
3f7c993d 192 free(statelists[0].head.slhead);\r
0de8e387 193 free(statelists[1].head.slhead); \r
f397b5cc
M		 194 return 0;\r
195}\r
196\r
b10a759f 197int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
9492e0b0 198\r
f397b5cc
M		 199 *key = 0;\r
200\r
b10a759f 201 UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};\r
f397b5cc 202 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
0de8e387 203 \r
204 clearCommandBuffer();\r
9492e0b0 205 SendCommand(&c);\r
902cb3c0 206 UsbCommand resp;\r
207 if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;\r
208 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
209 *key = bytes_to_num(resp.d.asBytes, 6);\r
f397b5cc
M		 210 return 0;\r
211}\r
8556b852 212\r
55acbb2a
M		 213// EMULATOR\r
214\r
8556b852 215int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
545a1f38 216 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
0de8e387 217 clearCommandBuffer();\r
902cb3c0 218 SendCommand(&c);\r
5c065fa0 219 UsbCommand resp;\r
902cb3c0 220 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
221 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
8556b852
M		 222 return 0;\r
223}\r
224\r
225int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
0de8e387 226 return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);\r
227}\r
228\r
229int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {\r
230 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};\r
231 memcpy(c.d.asBytes, data, blocksCount * blockBtWidth); \r
232\r
233 clearCommandBuffer();\r
545a1f38 234 SendCommand(&c);\r
8556b852
M		 235 return 0;\r
236}\r
237\r
55acbb2a
M		 238// "MAGIC" CARD\r
239\r
c2731f37 240int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {\r
3bba7dea 241\r
c2731f37 242 uint8_t params = MAGIC_SINGLE;\r
243 uint8_t block0[16];\r
244 memset(block0, 0x00, sizeof(block0));\r
245 \r
246\r
247 int old = mfCGetBlock(0, block0, params);\r
3bba7dea 248 if (old == 0) {\r
c2731f37 249 PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));\r
80b1b53f 250 } else {\r
3bba7dea
JH		 251 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
252 }\r
253\r
254 // fill in the new values\r
255 // UID\r
256 memcpy(block0, uid, 4); \r
257 // Mifare UID BCC\r
258 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
259 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
c2731f37 260 if ( sak != NULL )\r
3bba7dea 261 block0[5]=sak[0];\r
c2731f37 262 \r
263 if ( atqa != NULL ) {\r
3bba7dea
JH		 264 block0[6]=atqa[1];\r
265 block0[7]=atqa[0];\r
80b1b53f 266 }\r
3bba7dea 267 PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r
c2731f37 268 \r
269 if ( wipecard ) params |= MAGIC_WIPE; \r
270 if ( oldUID == NULL) params |= MAGIC_UID;\r
271 \r
272 return mfCSetBlock(0, block0, oldUID, params);\r
f774db95
M		 273}\r
274\r
c2731f37 275int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {\r
0675f200 276\r
1b492a97 277 uint8_t isOK = 0;\r
c2731f37 278 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};\r
f774db95 279 memcpy(c.d.asBytes, data, 16); \r
0de8e387 280 clearCommandBuffer();\r
281 SendCommand(&c);\r
1b492a97 282 UsbCommand resp;\r
c2731f37 283 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
902cb3c0 284 isOK = resp.arg[0] & 0xff;\r
80b1b53f 285 if (uid != NULL) \r
286 memcpy(uid, resp.d.asBytes, 4);\r
287 if (!isOK) \r
288 return 2;\r
0675f200
M		 289 } else {\r
290 PrintAndLog("Command execute timeout");\r
291 return 1;\r
292 }\r
293 return 0;\r
294}\r
545a1f38
M		 295\r
296int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
297 uint8_t isOK = 0;\r
c2731f37 298 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}}; \r
0de8e387 299 clearCommandBuffer();\r
545a1f38 300 SendCommand(&c);\r
0de8e387 301 UsbCommand resp;\r
902cb3c0 302 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
303 isOK = resp.arg[0] & 0xff;\r
304 memcpy(data, resp.d.asBytes, 16);\r
545a1f38
M		 305 if (!isOK) return 2;\r
306 } else {\r
307 PrintAndLog("Command execute timeout");\r
308 return 1;\r
309 }\r
310 return 0;\r
311}\r
55acbb2a
M		 312\r
313// SNIFFER\r
314\r
e0c635d1
M		 315// constants\r
316static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
317\r
55acbb2a 318// variables\r
e4691591 319char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
e0c635d1 320static uint8_t traceCard[4096] = {0x00};\r
e4691591 321static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
55acbb2a
M		 322static int traceState = TRACE_IDLE;\r
323static uint8_t traceCurBlock = 0;\r
324static uint8_t traceCurKey = 0;\r
325\r
326struct Crypto1State *traceCrypto1 = NULL;\r
327\r
046fd766 328struct Crypto1State *revstate = NULL;\r
329\r
330uint64_t key = 0;\r
331uint32_t ks2 = 0;\r
332uint32_t ks3 = 0;\r
55acbb2a 333\r
046fd766 334uint32_t uid = 0; // serial number\r
335uint32_t nt =0; // tag challenge\r
336uint32_t nr_enc =0; // encrypted reader challenge\r
337uint32_t ar_enc =0; // encrypted reader response\r
338uint32_t at_enc =0; // encrypted tag response\r
55acbb2a 339\r
e0c635d1
M		 340int isTraceCardEmpty(void) {\r
341 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
342}\r
55acbb2a 343\r
e0c635d1
M		 344int isBlockEmpty(int blockN) {\r
345 for (int i = 0; i < 16; i++) \r
346 if (traceCard[blockN * 16 + i] != 0) return 0;\r
55acbb2a 347\r
e0c635d1
M		 348 return 1;\r
349}\r
350\r
351int isBlockTrailer(int blockN) {\r
352 return ((blockN & 0x03) == 0x03);\r
353}\r
354\r
355int loadTraceCard(uint8_t *tuid) {\r
356 FILE * f;\r
80b1b53f 357 char buf[64] = {0x00};\r
358 uint8_t buf8[64] = {0x00};\r
e0c635d1
M		 359 int i, blockNum;\r
360 \r
80b1b53f 361 if (!isTraceCardEmpty()) \r
362 saveTraceCard();\r
363 \r
55acbb2a
M		 364 memset(traceCard, 0x00, 4096);\r
365 memcpy(traceCard, tuid + 3, 4);\r
80b1b53f 366\r
e0c635d1
M		 367 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
368\r
369 f = fopen(traceFileName, "r");\r
664bb5ae 370 if (!f) return 1;\r
e0c635d1
M		 371 \r
372 blockNum = 0;\r
e4691591 373 \r
e0c635d1 374 while(!feof(f)){\r
e4691591 375 \r
e0c635d1 376 memset(buf, 0, sizeof(buf));\r
759c16b3 377 if (fgets(buf, sizeof(buf), f) == NULL) {\r
046fd766 378 PrintAndLog("File reading error.");\r
1b492a97 379 fclose(f);\r
759c16b3 380 return 2;\r
046fd766 381 }\r
e0c635d1
M		 382\r
383 if (strlen(buf) < 32){\r
384 if (feof(f)) break;\r
385 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
1b492a97 386 fclose(f);\r
e0c635d1
M		 387 return 2;\r
388 }\r
389 for (i = 0; i < 32; i += 2)\r
390 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
391\r
392 memcpy(traceCard + blockNum * 16, buf8, 16);\r
393\r
394 blockNum++;\r
395 }\r
396 fclose(f);\r
397\r
398 return 0;\r
399}\r
400\r
401int saveTraceCard(void) {\r
402 FILE * f;\r
403 \r
404 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
405 \r
406 f = fopen(traceFileName, "w+");\r
664bb5ae 407 if ( !f ) return 1;\r
e4691591 408 \r
e0c635d1
M		 409 for (int i = 0; i < 64; i++) { // blocks\r
410 for (int j = 0; j < 16; j++) // bytes\r
411 fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
412 fprintf(f,"\n");\r
413 }\r
414 fclose(f);\r
e0c635d1
M		 415 return 0;\r
416}\r
417\r
418int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
419\r
80b1b53f 420 if (traceCrypto1) \r
421 crypto1_destroy(traceCrypto1);\r
422\r
e0c635d1
M		 423 traceCrypto1 = NULL;\r
424\r
80b1b53f 425 if (wantSaveToEmlFile) \r
426 loadTraceCard(tuid);\r
427 \r
55acbb2a
M		 428 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
429 traceCard[5] = sak;\r
430 memcpy(&traceCard[6], atqa, 2);\r
431 traceCurBlock = 0;\r
432 uid = bytes_to_num(tuid + 3, 4);\r
433 \r
434 traceState = TRACE_IDLE;\r
435\r
436 return 0;\r
437}\r
438\r
439void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
440 uint8_t bt = 0;\r
441 int i;\r
442 \r
443 if (len != 1) {\r
444 for (i = 0; i < len; i++)\r
445 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
446 } else {\r
447 bt = 0;\r
448 for (i = 0; i < 4; i++)\r
449 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r
450 \r
451 data[0] = bt;\r
452 }\r
453 return;\r
454}\r
455\r
456\r
a501c82b 457int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
55acbb2a
M		 458 uint8_t data[64];\r
459\r
460 if (traceState == TRACE_ERROR) return 1;\r
461 if (len > 64) {\r
462 traceState = TRACE_ERROR;\r
463 return 1;\r
464 }\r
465 \r
466 memcpy(data, data_src, len);\r
467 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
468 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
469 PrintAndLog("dec> %s", sprint_hex(data, len));\r
470 AddLogHex(logHexFileName, "dec> ", data, len); \r
471 }\r
472 \r
473 switch (traceState) {\r
474 case TRACE_IDLE: \r
8b6a93df
M		 475 // check packet crc16!\r
476 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
477 PrintAndLog("dec> CRC ERROR!!!");\r
478 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r
479 traceState = TRACE_ERROR; // do not decrypt the next commands\r
480 return 1;\r
481 }\r
55acbb2a
M		 482 \r
483 // AUTHENTICATION\r
a61b4976 484 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
55acbb2a
M		 485 traceState = TRACE_AUTH1;\r
486 traceCurBlock = data[1];\r
487 traceCurKey = data[0] == 60 ? 1:0;\r
488 return 0;\r
489 }\r
490\r
491 // READ\r
492 if ((len ==4) && ((data[0] == 0x30))) {\r
493 traceState = TRACE_READ_DATA;\r
494 traceCurBlock = data[1];\r
495 return 0;\r
496 }\r
497\r
498 // WRITE\r
499 if ((len ==4) && ((data[0] == 0xA0))) {\r
500 traceState = TRACE_WRITE_OK;\r
501 traceCurBlock = data[1];\r
502 return 0;\r
503 }\r
504\r
505 // HALT\r
506 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
507 traceState = TRACE_ERROR; // do not decrypt the next commands\r
508 return 0;\r
509 }\r
510 \r
511 return 0;\r
512 break;\r
513 \r
514 case TRACE_READ_DATA: \r
515 if (len == 18) {\r
516 traceState = TRACE_IDLE;\r
517\r
e0c635d1
M		 518 if (isBlockTrailer(traceCurBlock)) {\r
519 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
520 } else {\r
521 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
522 }\r
523 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 524 return 0;\r
525 } else {\r
526 traceState = TRACE_ERROR;\r
527 return 1;\r
528 }\r
529 break;\r
530\r
531 case TRACE_WRITE_OK: \r
a61b4976 532 if ((len == 1) && (data[0] == 0x0a)) {\r
55acbb2a
M		 533 traceState = TRACE_WRITE_DATA;\r
534\r
535 return 0;\r
536 } else {\r
537 traceState = TRACE_ERROR;\r
538 return 1;\r
539 }\r
540 break;\r
541\r
542 case TRACE_WRITE_DATA: \r
543 if (len == 18) {\r
544 traceState = TRACE_IDLE;\r
545\r
546 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
e0c635d1 547 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 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_AUTH1: \r
556 if (len == 4) {\r
557 traceState = TRACE_AUTH2;\r
55acbb2a
M		 558 nt = bytes_to_num(data, 4);\r
559 return 0;\r
560 } else {\r
561 traceState = TRACE_ERROR;\r
562 return 1;\r
563 }\r
564 break;\r
565\r
566 case TRACE_AUTH2: \r
567 if (len == 8) {\r
568 traceState = TRACE_AUTH_OK;\r
569\r
570 nr_enc = bytes_to_num(data, 4);\r
571 ar_enc = bytes_to_num(data + 4, 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_AUTH_OK: \r
580 if (len ==4) {\r
581 traceState = TRACE_IDLE;\r
582\r
583 at_enc = bytes_to_num(data, 4);\r
584 \r
585 // decode key here)\r
a61b4976 586 ks2 = ar_enc ^ prng_successor(nt, 64);\r
587 ks3 = at_enc ^ prng_successor(nt, 96);\r
588 revstate = lfsr_recovery64(ks2, ks3);\r
589 lfsr_rollback_word(revstate, 0, 0);\r
590 lfsr_rollback_word(revstate, 0, 0);\r
591 lfsr_rollback_word(revstate, nr_enc, 1);\r
592 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
593\r
046fd766 594 crypto1_get_lfsr(revstate, &key);\r
595 printf("Key: %012"llx"\n",key);\r
596 AddLogUint64(logHexFileName, "key: ", key); \r
55acbb2a 597 \r
e0c635d1
M		 598 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
599 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
600 \r
55acbb2a 601 if (traceCurKey) {\r
046fd766 602 num_to_bytes(key, 6, traceCard + blockShift + 10);\r
55acbb2a 603 } else {\r
046fd766 604 num_to_bytes(key, 6, traceCard + blockShift);\r
55acbb2a 605 }\r
e0c635d1 606 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 607\r
608 if (traceCrypto1) {\r
609 crypto1_destroy(traceCrypto1);\r
610 }\r
611 \r
612 // set cryptosystem state\r
613 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
614 \r
615// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
616\r
046fd766 617 /* traceCrypto1 = crypto1_create(key); // key in lfsr\r
55acbb2a
M		 618 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
619 crypto1_word(traceCrypto1, ar, 1);\r
620 crypto1_word(traceCrypto1, 0, 0);\r
621 crypto1_word(traceCrypto1, 0, 0);*/\r
622 \r
623 return 0;\r
624 } else {\r
625 traceState = TRACE_ERROR;\r
626 return 1;\r
627 }\r
628 break;\r
629\r
630 default: \r
631 traceState = TRACE_ERROR;\r
632 return 1;\r
633 }\r
634\r
635 return 0;\r
636}\r
e98572a1 637\r
638int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
639 /*\r
640 uint32_t nt; // tag challenge\r
3bc7b13d 641 uint32_t nr_enc; // encrypted reader challenge\r
e98572a1 642 uint32_t ar_enc; // encrypted reader response\r
643 uint32_t at_enc; // encrypted tag response\r
644 */\r
3bc7b13d 645\r
646 struct Crypto1State *pcs = NULL;\r
647 \r
e98572a1 648 ks2 = ar_enc ^ prng_successor(nt, 64);\r
649 ks3 = at_enc ^ prng_successor(nt, 96);\r
3bc7b13d 650 \r
651 PrintAndLog("Decrypting data with:");\r
652 PrintAndLog(" nt: %08x",nt);\r
653 PrintAndLog(" ar_enc: %08x",ar_enc);\r
654 PrintAndLog(" at_enc: %08x",at_enc);\r
655 PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );\r
656\r
657 pcs = lfsr_recovery64(ks2, ks3);\r
658 mf_crypto1_decrypt(pcs, data, len, FALSE);\r
e98572a1 659 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
3bc7b13d 660 crypto1_destroy(pcs);\r
e98572a1 661 return 0;\r
662}\r
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