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FIX: Coverity, strlen(Cmd) can never be lesser than zero.. *douh*
[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
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
28415b5d 82 clearCommandBuffer();\r
83 //WaitForResponseTimeout(CMD_ACK,NULL,100);\r
f397b5cc 84 \r
9492e0b0 85 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
f397b5cc 86 memcpy(c.d.asBytes, key, 6);\r
9492e0b0 87 SendCommand(&c);\r
f397b5cc 88\r
c830303d 89 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
90 return -1;\r
91 }\r
92\r
93 if (resp.arg[0]) {\r
94 return resp.arg[0]; // error during nested\r
95 }\r
96 \r
0de8e387 97 memcpy(&uid, resp.d.asBytes, 4);\r
c830303d 98 PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r
f397b5cc 99 \r
0de8e387 100 for (i = 0; i < 2; i++) {\r
101 statelists[i].blockNo = resp.arg[2] & 0xff;\r
102 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
103 statelists[i].uid = uid;\r
104 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
105 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
106 }\r
f397b5cc 107 \r
f397b5cc 108 // calc keys\r
f397b5cc 109 \r
9492e0b0 110 pthread_t thread_id[2];\r
111 \r
112 // create and run worker threads\r
113 for (i = 0; i < 2; i++) {\r
114 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
f397b5cc
M		 115 }\r
116 \r
9492e0b0 117 // wait for threads to terminate:\r
118 for (i = 0; i < 2; i++) {\r
3f7c993d 119 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
f397b5cc
M		 120 }\r
121\r
f397b5cc 122\r
9492e0b0 123 // the first 16 Bits of the cryptostate already contain part of our key.\r
124 // Create the intersection of the two lists based on these 16 Bits and\r
125 // roll back the cryptostate\r
3f7c993d 126 p1 = p3 = statelists[0].head.slhead; \r
127 p2 = p4 = statelists[1].head.slhead;\r
128 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 129 if (Compare16Bits(p1, p2) == 0) {\r
130 struct Crypto1State savestate, *savep = &savestate;\r
131 savestate = *p1;\r
3f7c993d 132 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
9492e0b0 133 *p3 = *p1;\r
134 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
135 p3++;\r
136 p1++;\r
137 }\r
138 savestate = *p2;\r
3f7c993d 139 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 140 *p4 = *p2;\r
141 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
142 p4++;\r
143 p2++;\r
144 }\r
145 }\r
146 else {\r
147 while (Compare16Bits(p1, p2) == -1) p1++;\r
148 while (Compare16Bits(p1, p2) == 1) p2++;\r
149 }\r
f397b5cc 150 }\r
9492e0b0 151 p3->even = 0; p3->odd = 0;\r
152 p4->even = 0; p4->odd = 0;\r
3f7c993d 153 statelists[0].len = p3 - statelists[0].head.slhead;\r
154 statelists[1].len = p4 - statelists[1].head.slhead;\r
155 statelists[0].tail.sltail=--p3;\r
156 statelists[1].tail.sltail=--p4;\r
9492e0b0 157\r
158 // the statelists now contain possible keys. The key we are searching for must be in the\r
159 // intersection of both lists. Create the intersection:\r
3f7c993d 160 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);\r
161 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);\r
9492e0b0 162\r
163 uint64_t *p5, *p6, *p7;\r
3f7c993d 164 p5 = p7 = statelists[0].head.keyhead; \r
165 p6 = statelists[1].head.keyhead;\r
166 while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {\r
9492e0b0 167 if (compar_int(p5, p6) == 0) {\r
168 *p7++ = *p5++;\r
169 p6++;\r
170 }\r
171 else {\r
172 while (compar_int(p5, p6) == -1) p5++;\r
173 while (compar_int(p5, p6) == 1) p6++;\r
174 }\r
175 }\r
3f7c993d 176 statelists[0].len = p7 - statelists[0].head.keyhead;\r
177 statelists[0].tail.keytail=--p7;\r
9492e0b0 178\r
179 memset(resultKey, 0, 6);\r
180 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
181 for (i = 0; i < statelists[0].len; i++) {\r
182 uint8_t keyBlock[6];\r
183 uint64_t key64;\r
3f7c993d 184 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
9492e0b0 185 num_to_bytes(key64, 6, keyBlock);\r
186 key64 = 0;\r
b10a759f 187 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
9492e0b0 188 num_to_bytes(key64, 6, resultKey);\r
189 break;\r
190 }\r
191 }\r
192 \r
3f7c993d 193 free(statelists[0].head.slhead);\r
0de8e387 194 free(statelists[1].head.slhead); \r
f397b5cc
M		 195 return 0;\r
196}\r
197\r
b10a759f 198int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
9492e0b0 199\r
f397b5cc
M		 200 *key = 0;\r
201\r
b10a759f 202 UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};\r
f397b5cc 203 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
0de8e387 204 \r
205 clearCommandBuffer();\r
9492e0b0 206 SendCommand(&c);\r
902cb3c0 207 UsbCommand resp;\r
208 if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;\r
209 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
210 *key = bytes_to_num(resp.d.asBytes, 6);\r
f397b5cc
M		 211 return 0;\r
212}\r
8556b852 213\r
55acbb2a
M		 214// EMULATOR\r
215\r
8556b852 216int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
545a1f38 217 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
0de8e387 218 clearCommandBuffer();\r
902cb3c0 219 SendCommand(&c);\r
5c065fa0 220 UsbCommand resp;\r
902cb3c0 221 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
222 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
8556b852
M		 223 return 0;\r
224}\r
225\r
226int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
0de8e387 227 return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);\r
228}\r
229\r
230int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {\r
231 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};\r
232 memcpy(c.d.asBytes, data, blocksCount * blockBtWidth); \r
233\r
234 clearCommandBuffer();\r
545a1f38 235 SendCommand(&c);\r
8556b852
M		 236 return 0;\r
237}\r
238\r
55acbb2a
M		 239// "MAGIC" CARD\r
240\r
c2731f37 241int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {\r
3bba7dea 242\r
c2731f37 243 uint8_t params = MAGIC_SINGLE;\r
244 uint8_t block0[16];\r
245 memset(block0, 0x00, sizeof(block0));\r
246 \r
247\r
248 int old = mfCGetBlock(0, block0, params);\r
3bba7dea 249 if (old == 0) {\r
c2731f37 250 PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));\r
80b1b53f 251 } else {\r
3bba7dea
JH		 252 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
253 }\r
254\r
255 // fill in the new values\r
256 // UID\r
257 memcpy(block0, uid, 4); \r
258 // Mifare UID BCC\r
259 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
260 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
c2731f37 261 if ( sak != NULL )\r
3bba7dea 262 block0[5]=sak[0];\r
c2731f37 263 \r
264 if ( atqa != NULL ) {\r
3bba7dea
JH		 265 block0[6]=atqa[1];\r
266 block0[7]=atqa[0];\r
80b1b53f 267 }\r
3bba7dea 268 PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r
c2731f37 269 \r
270 if ( wipecard ) params |= MAGIC_WIPE; \r
271 if ( oldUID == NULL) params |= MAGIC_UID;\r
272 \r
273 return mfCSetBlock(0, block0, oldUID, params);\r
f774db95
M		 274}\r
275\r
c2731f37 276int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {\r
0675f200 277\r
1b492a97 278 uint8_t isOK = 0;\r
c2731f37 279 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};\r
f774db95 280 memcpy(c.d.asBytes, data, 16); \r
0de8e387 281 clearCommandBuffer();\r
282 SendCommand(&c);\r
1b492a97 283 UsbCommand resp;\r
c2731f37 284 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
902cb3c0 285 isOK = resp.arg[0] & 0xff;\r
80b1b53f 286 if (uid != NULL) \r
287 memcpy(uid, resp.d.asBytes, 4);\r
288 if (!isOK) \r
289 return 2;\r
0675f200
M		 290 } else {\r
291 PrintAndLog("Command execute timeout");\r
292 return 1;\r
293 }\r
294 return 0;\r
295}\r
545a1f38
M		 296\r
297int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
298 uint8_t isOK = 0;\r
c2731f37 299 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}}; \r
0de8e387 300 clearCommandBuffer();\r
545a1f38 301 SendCommand(&c);\r
0de8e387 302 UsbCommand resp;\r
902cb3c0 303 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
304 isOK = resp.arg[0] & 0xff;\r
305 memcpy(data, resp.d.asBytes, 16);\r
545a1f38
M		 306 if (!isOK) return 2;\r
307 } else {\r
308 PrintAndLog("Command execute timeout");\r
309 return 1;\r
310 }\r
311 return 0;\r
312}\r
55acbb2a
M		 313\r
314// SNIFFER\r
315\r
e0c635d1
M		 316// constants\r
317static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
318\r
55acbb2a 319// variables\r
e4691591 320char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
e0c635d1 321static uint8_t traceCard[4096] = {0x00};\r
e4691591 322static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
55acbb2a
M		 323static int traceState = TRACE_IDLE;\r
324static uint8_t traceCurBlock = 0;\r
325static uint8_t traceCurKey = 0;\r
326\r
327struct Crypto1State *traceCrypto1 = NULL;\r
328\r
046fd766 329struct Crypto1State *revstate = NULL;\r
330\r
331uint64_t key = 0;\r
332uint32_t ks2 = 0;\r
333uint32_t ks3 = 0;\r
55acbb2a 334\r
046fd766 335uint32_t uid = 0; // serial number\r
336uint32_t nt =0; // tag challenge\r
337uint32_t nr_enc =0; // encrypted reader challenge\r
338uint32_t ar_enc =0; // encrypted reader response\r
339uint32_t at_enc =0; // encrypted tag response\r
55acbb2a 340\r
e0c635d1
M		 341int isTraceCardEmpty(void) {\r
342 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
343}\r
55acbb2a 344\r
e0c635d1
M		 345int isBlockEmpty(int blockN) {\r
346 for (int i = 0; i < 16; i++) \r
347 if (traceCard[blockN * 16 + i] != 0) return 0;\r
55acbb2a 348\r
e0c635d1
M		 349 return 1;\r
350}\r
351\r
352int isBlockTrailer(int blockN) {\r
353 return ((blockN & 0x03) == 0x03);\r
354}\r
355\r
356int loadTraceCard(uint8_t *tuid) {\r
357 FILE * f;\r
80b1b53f 358 char buf[64] = {0x00};\r
359 uint8_t buf8[64] = {0x00};\r
e0c635d1
M		 360 int i, blockNum;\r
361 \r
80b1b53f 362 if (!isTraceCardEmpty()) \r
363 saveTraceCard();\r
364 \r
55acbb2a
M		 365 memset(traceCard, 0x00, 4096);\r
366 memcpy(traceCard, tuid + 3, 4);\r
80b1b53f 367\r
e0c635d1
M		 368 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
369\r
370 f = fopen(traceFileName, "r");\r
664bb5ae 371 if (!f) return 1;\r
e0c635d1
M		 372 \r
373 blockNum = 0;\r
e4691591 374 \r
e0c635d1 375 while(!feof(f)){\r
e4691591 376 \r
e0c635d1 377 memset(buf, 0, sizeof(buf));\r
759c16b3 378 if (fgets(buf, sizeof(buf), f) == NULL) {\r
046fd766 379 PrintAndLog("File reading error.");\r
1b492a97 380 fclose(f);\r
759c16b3 381 return 2;\r
046fd766 382 }\r
e0c635d1
M		 383\r
384 if (strlen(buf) < 32){\r
385 if (feof(f)) break;\r
386 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
1b492a97 387 fclose(f);\r
e0c635d1
M		 388 return 2;\r
389 }\r
390 for (i = 0; i < 32; i += 2)\r
391 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
392\r
393 memcpy(traceCard + blockNum * 16, buf8, 16);\r
394\r
395 blockNum++;\r
396 }\r
397 fclose(f);\r
398\r
399 return 0;\r
400}\r
401\r
402int saveTraceCard(void) {\r
403 FILE * f;\r
404 \r
405 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
406 \r
407 f = fopen(traceFileName, "w+");\r
664bb5ae 408 if ( !f ) return 1;\r
e4691591 409 \r
e0c635d1
M		 410 for (int i = 0; i < 64; i++) { // blocks\r
411 for (int j = 0; j < 16; j++) // bytes\r
412 fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
413 fprintf(f,"\n");\r
414 }\r
415 fclose(f);\r
e0c635d1
M		 416 return 0;\r
417}\r
418\r
419int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
420\r
80b1b53f 421 if (traceCrypto1) \r
422 crypto1_destroy(traceCrypto1);\r
423\r
e0c635d1
M		 424 traceCrypto1 = NULL;\r
425\r
80b1b53f 426 if (wantSaveToEmlFile) \r
427 loadTraceCard(tuid);\r
428 \r
55acbb2a
M		 429 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
430 traceCard[5] = sak;\r
431 memcpy(&traceCard[6], atqa, 2);\r
432 traceCurBlock = 0;\r
433 uid = bytes_to_num(tuid + 3, 4);\r
434 \r
435 traceState = TRACE_IDLE;\r
436\r
437 return 0;\r
438}\r
439\r
440void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
441 uint8_t bt = 0;\r
442 int i;\r
443 \r
444 if (len != 1) {\r
445 for (i = 0; i < len; i++)\r
446 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
447 } else {\r
448 bt = 0;\r
449 for (i = 0; i < 4; i++)\r
450 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r
451 \r
452 data[0] = bt;\r
453 }\r
454 return;\r
455}\r
456\r
457\r
a501c82b 458int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
55acbb2a
M		 459 uint8_t data[64];\r
460\r
461 if (traceState == TRACE_ERROR) return 1;\r
462 if (len > 64) {\r
463 traceState = TRACE_ERROR;\r
464 return 1;\r
465 }\r
466 \r
467 memcpy(data, data_src, len);\r
468 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
469 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
470 PrintAndLog("dec> %s", sprint_hex(data, len));\r
471 AddLogHex(logHexFileName, "dec> ", data, len); \r
472 }\r
473 \r
474 switch (traceState) {\r
475 case TRACE_IDLE: \r
8b6a93df
M		 476 // check packet crc16!\r
477 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
478 PrintAndLog("dec> CRC ERROR!!!");\r
479 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r
480 traceState = TRACE_ERROR; // do not decrypt the next commands\r
481 return 1;\r
482 }\r
55acbb2a
M		 483 \r
484 // AUTHENTICATION\r
a61b4976 485 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
55acbb2a
M		 486 traceState = TRACE_AUTH1;\r
487 traceCurBlock = data[1];\r
488 traceCurKey = data[0] == 60 ? 1:0;\r
489 return 0;\r
490 }\r
491\r
492 // READ\r
493 if ((len ==4) && ((data[0] == 0x30))) {\r
494 traceState = TRACE_READ_DATA;\r
495 traceCurBlock = data[1];\r
496 return 0;\r
497 }\r
498\r
499 // WRITE\r
500 if ((len ==4) && ((data[0] == 0xA0))) {\r
501 traceState = TRACE_WRITE_OK;\r
502 traceCurBlock = data[1];\r
503 return 0;\r
504 }\r
505\r
506 // HALT\r
507 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
508 traceState = TRACE_ERROR; // do not decrypt the next commands\r
509 return 0;\r
510 }\r
511 \r
512 return 0;\r
513 break;\r
514 \r
515 case TRACE_READ_DATA: \r
516 if (len == 18) {\r
517 traceState = TRACE_IDLE;\r
518\r
e0c635d1
M		 519 if (isBlockTrailer(traceCurBlock)) {\r
520 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
521 } else {\r
522 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
523 }\r
524 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 525 return 0;\r
526 } else {\r
527 traceState = TRACE_ERROR;\r
528 return 1;\r
529 }\r
530 break;\r
531\r
532 case TRACE_WRITE_OK: \r
a61b4976 533 if ((len == 1) && (data[0] == 0x0a)) {\r
55acbb2a
M		 534 traceState = TRACE_WRITE_DATA;\r
535\r
536 return 0;\r
537 } else {\r
538 traceState = TRACE_ERROR;\r
539 return 1;\r
540 }\r
541 break;\r
542\r
543 case TRACE_WRITE_DATA: \r
544 if (len == 18) {\r
545 traceState = TRACE_IDLE;\r
546\r
547 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
e0c635d1 548 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 549 return 0;\r
550 } else {\r
551 traceState = TRACE_ERROR;\r
552 return 1;\r
553 }\r
554 break;\r
555\r
556 case TRACE_AUTH1: \r
557 if (len == 4) {\r
558 traceState = TRACE_AUTH2;\r
55acbb2a
M		 559 nt = bytes_to_num(data, 4);\r
560 return 0;\r
561 } else {\r
562 traceState = TRACE_ERROR;\r
563 return 1;\r
564 }\r
565 break;\r
566\r
567 case TRACE_AUTH2: \r
568 if (len == 8) {\r
569 traceState = TRACE_AUTH_OK;\r
570\r
571 nr_enc = bytes_to_num(data, 4);\r
572 ar_enc = bytes_to_num(data + 4, 4);\r
573 return 0;\r
574 } else {\r
575 traceState = TRACE_ERROR;\r
576 return 1;\r
577 }\r
578 break;\r
579\r
580 case TRACE_AUTH_OK: \r
581 if (len ==4) {\r
582 traceState = TRACE_IDLE;\r
583\r
584 at_enc = bytes_to_num(data, 4);\r
585 \r
586 // decode key here)\r
a61b4976 587 ks2 = ar_enc ^ prng_successor(nt, 64);\r
588 ks3 = at_enc ^ prng_successor(nt, 96);\r
589 revstate = lfsr_recovery64(ks2, ks3);\r
590 lfsr_rollback_word(revstate, 0, 0);\r
591 lfsr_rollback_word(revstate, 0, 0);\r
592 lfsr_rollback_word(revstate, nr_enc, 1);\r
593 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
594\r
046fd766 595 crypto1_get_lfsr(revstate, &key);\r
596 printf("Key: %012"llx"\n",key);\r
597 AddLogUint64(logHexFileName, "key: ", key); \r
55acbb2a 598 \r
e0c635d1
M		 599 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
600 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
601 \r
55acbb2a 602 if (traceCurKey) {\r
046fd766 603 num_to_bytes(key, 6, traceCard + blockShift + 10);\r
55acbb2a 604 } else {\r
046fd766 605 num_to_bytes(key, 6, traceCard + blockShift);\r
55acbb2a 606 }\r
e0c635d1 607 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 608\r
609 if (traceCrypto1) {\r
610 crypto1_destroy(traceCrypto1);\r
611 }\r
612 \r
613 // set cryptosystem state\r
614 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
615 \r
616// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
617\r
046fd766 618 /* traceCrypto1 = crypto1_create(key); // key in lfsr\r
55acbb2a
M		 619 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
620 crypto1_word(traceCrypto1, ar, 1);\r
621 crypto1_word(traceCrypto1, 0, 0);\r
622 crypto1_word(traceCrypto1, 0, 0);*/\r
623 \r
624 return 0;\r
625 } else {\r
626 traceState = TRACE_ERROR;\r
627 return 1;\r
628 }\r
629 break;\r
630\r
631 default: \r
632 traceState = TRACE_ERROR;\r
633 return 1;\r
634 }\r
635\r
636 return 0;\r
637}\r
e98572a1 638\r
639int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
640 /*\r
641 uint32_t nt; // tag challenge\r
3bc7b13d 642 uint32_t nr_enc; // encrypted reader challenge\r
e98572a1 643 uint32_t ar_enc; // encrypted reader response\r
644 uint32_t at_enc; // encrypted tag response\r
645 */\r
3bc7b13d 646\r
647 struct Crypto1State *pcs = NULL;\r
648 \r
e98572a1 649 ks2 = ar_enc ^ prng_successor(nt, 64);\r
650 ks3 = at_enc ^ prng_successor(nt, 96);\r
3bc7b13d 651 \r
652 PrintAndLog("Decrypting data with:");\r
653 PrintAndLog(" nt: %08x",nt);\r
654 PrintAndLog(" ar_enc: %08x",ar_enc);\r
655 PrintAndLog(" at_enc: %08x",at_enc);\r
656 PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );\r
657\r
658 pcs = lfsr_recovery64(ks2, ks3);\r
659 mf_crypto1_decrypt(pcs, data, len, FALSE);\r
e98572a1 660 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
3bc7b13d 661 crypto1_destroy(pcs);\r
e98572a1 662 return 0;\r
663}\r
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