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[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
c9f8bc53 17//#include "radixsort.h"\r
838c15a6 18#include <time.h>\r
f397b5cc 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
6b10e329 26 if (*(uint64_t*)b > *(uint64_t*)a) return 1;\r
838c15a6 27 if (*(uint64_t*)b < *(uint64_t*)a) return -1; \r
6b10e329 28 return 0;\r
838c15a6 29\r
30 //return (*(uint64_t*)b > *(uint64_t*)a) - (*(uint64_t*)b < *(uint64_t*)a);\r
f397b5cc
M		 31}\r
32\r
9492e0b0 33// Compare 16 Bits out of cryptostate\r
34int Compare16Bits(const void * a, const void * b) {\r
6b10e329 35 if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1; \r
838c15a6 36 if ((*(uint64_t*)b & 0x00ff000000ff0000) < (*(uint64_t*)a & 0x00ff000000ff0000)) return -1;\r
6b10e329 37 return 0;\r
838c15a6 38\r
39/* return \r
d294f582 40 ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000))\r
41 -\r
42 ((*(uint64_t*)b & 0x00ff000000ff0000) < (*(uint64_t*)a & 0x00ff000000ff0000))\r
43 ;\r
838c15a6 44*/\r
f397b5cc
M		 45}\r
46\r
9492e0b0 47typedef \r
48 struct {\r
49 union {\r
50 struct Crypto1State *slhead;\r
51 uint64_t *keyhead;\r
3f7c993d 52 } head;\r
9492e0b0 53 union {\r
54 struct Crypto1State *sltail;\r
55 uint64_t *keytail;\r
3f7c993d 56 } tail;\r
9492e0b0 57 uint32_t len;\r
58 uint32_t uid;\r
59 uint32_t blockNo;\r
60 uint32_t keyType;\r
61 uint32_t nt;\r
62 uint32_t ks1;\r
63 } StateList_t;\r
64\r
65\r
66// wrapper function for multi-threaded lfsr_recovery32\r
67void* nested_worker_thread(void *arg)\r
68{\r
69 struct Crypto1State *p1;\r
70 StateList_t *statelist = arg;\r
b882b543 71 statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid); \r
d294f582 72 \r
6b10e329 73 for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);\r
d294f582 74 \r
3f7c993d 75 statelist->len = p1 - statelist->head.slhead;\r
76 statelist->tail.sltail = --p1;\r
77 qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\r
3f7c993d 78 return statelist->head.slhead;\r
f397b5cc
M		 79}\r
80\r
9492e0b0 81int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) \r
f397b5cc 82{\r
c830303d 83 uint16_t i;\r
f397b5cc 84 uint32_t uid;\r
902cb3c0 85 UsbCommand resp;\r
9492e0b0 86 StateList_t statelists[2];\r
87 struct Crypto1State *p1, *p2, *p3, *p4;\r
88 \r
9492e0b0 89 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
f397b5cc 90 memcpy(c.d.asBytes, key, 6);\r
952f3dc7 91 clearCommandBuffer();\r
9492e0b0 92 SendCommand(&c);\r
952f3dc7 93 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) return -1;\r
c830303d 94\r
952f3dc7 95 // error during nested\r
96 if (resp.arg[0]) return resp.arg[0];\r
97 \r
b882b543 98 memcpy(&uid, resp.d.asBytes, 4);\r
6b10e329 99 \r
100 for (i = 0; i < 2; i++) {\r
0de8e387 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
d294f582 108 // calc keys \r
9492e0b0 109 pthread_t thread_id[2];\r
110 \r
111 // create and run worker threads\r
d294f582 112 for (i = 0; i < 2; i++)\r
9492e0b0 113 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
6b10e329 114\r
9492e0b0 115 // wait for threads to terminate:\r
d294f582 116 for (i = 0; i < 2; i++)\r
3f7c993d 117 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
f397b5cc 118\r
9492e0b0 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
3f7c993d 122 p1 = p3 = statelists[0].head.slhead; \r
123 p2 = p4 = statelists[1].head.slhead;\r
6b10e329 124\r
3f7c993d 125 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 126 if (Compare16Bits(p1, p2) == 0) {\r
6b10e329 127 \r
9492e0b0 128 struct Crypto1State savestate, *savep = &savestate;\r
129 savestate = *p1;\r
3f7c993d 130 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
9492e0b0 131 *p3 = *p1;\r
132 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
133 p3++;\r
134 p1++;\r
135 }\r
136 savestate = *p2;\r
3f7c993d 137 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
9492e0b0 138 *p4 = *p2;\r
139 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
140 p4++;\r
141 p2++;\r
142 }\r
143 }\r
144 else {\r
145 while (Compare16Bits(p1, p2) == -1) p1++;\r
146 while (Compare16Bits(p1, p2) == 1) p2++;\r
147 }\r
f397b5cc 148 }\r
838c15a6 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
838c15a6 161 \r
9492e0b0 162 uint64_t *p5, *p6, *p7;\r
3f7c993d 163 p5 = p7 = statelists[0].head.keyhead; \r
164 p6 = statelists[1].head.keyhead;\r
838c15a6 165 \r
3f7c993d 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
d294f582 177 statelists[0].tail.keytail = --p7;\r
9492e0b0 178\r
838c15a6 179 uint32_t numOfCandidates = statelists[0].len;\r
180 if ( numOfCandidates == 0 ) goto out;\r
181 \r
9492e0b0 182 memset(resultKey, 0, 6);\r
d294f582 183 uint64_t key64 = 0;\r
184\r
9492e0b0 185 // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
6b10e329 186 // uint32_t max_keys = keycnt > (USB_CMD_DATA_SIZE/6) ? (USB_CMD_DATA_SIZE/6) : keycnt;\r
838c15a6 187 uint8_t keyBlock[USB_CMD_DATA_SIZE] = {0x00};\r
d294f582 188\r
838c15a6 189 for (i = 0; i < numOfCandidates; ++i){\r
190 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
191 num_to_bytes(key64, 6, keyBlock + i * 6);\r
192 }\r
6b10e329 193\r
838c15a6 194 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, numOfCandidates, keyBlock, &key64)) { \r
195 free(statelists[0].head.slhead);\r
196 free(statelists[1].head.slhead);\r
197 num_to_bytes(key64, 6, resultKey);\r
d294f582 198\r
838c15a6 199 PrintAndLog("UID: %08x target block:%3u key type: %c -- Found key [%012"llx"]",\r
200 uid,\r
201 (uint16_t)resp.arg[2] & 0xff,\r
202 (resp.arg[2] >> 8) ? 'B' : 'A',\r
203 key64\r
204 );\r
205 return -5;\r
9492e0b0 206 }\r
838c15a6 207 \r
208out:\r
6b10e329 209 PrintAndLog("UID: %08x target block:%3u key type: %c",\r
b882b543 210 uid,\r
6b10e329 211 (uint16_t)resp.arg[2] & 0xff,\r
212 (resp.arg[2] >> 8) ? 'B' : 'A'\r
213 ); \r
214\r
3f7c993d 215 free(statelists[0].head.slhead);\r
d294f582 216 free(statelists[1].head.slhead);\r
217 return -4;\r
f397b5cc
M		 218}\r
219\r
b10a759f 220int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
9492e0b0 221\r
f397b5cc 222 *key = 0;\r
d294f582 223 UsbCommand c = {CMD_MIFARE_CHKKEYS, { (blockNo | (keyType<<8)), clear_trace, keycnt}};\r
f397b5cc 224 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
0de8e387 225 clearCommandBuffer();\r
9492e0b0 226 SendCommand(&c);\r
902cb3c0 227 UsbCommand resp;\r
b0300679 228 if (!WaitForResponseTimeout(CMD_ACK,&resp, 2500)) return 1;\r
902cb3c0 229 if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
230 *key = bytes_to_num(resp.d.asBytes, 6);\r
f397b5cc
M		 231 return 0;\r
232}\r
8556b852 233\r
55acbb2a
M		 234// EMULATOR\r
235\r
8556b852 236int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
545a1f38 237 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
0de8e387 238 clearCommandBuffer();\r
902cb3c0 239 SendCommand(&c);\r
5c065fa0 240 UsbCommand resp;\r
902cb3c0 241 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
242 memcpy(data, resp.d.asBytes, blocksCount * 16);\r
8556b852
M		 243 return 0;\r
244}\r
245\r
246int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
0de8e387 247 return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);\r
248}\r
249\r
250int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {\r
251 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};\r
252 memcpy(c.d.asBytes, data, blocksCount * blockBtWidth); \r
253\r
254 clearCommandBuffer();\r
545a1f38 255 SendCommand(&c);\r
8556b852
M		 256 return 0;\r
257}\r
258\r
55acbb2a
M		 259// "MAGIC" CARD\r
260\r
c2731f37 261int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {\r
3bba7dea 262\r
c2731f37 263 uint8_t params = MAGIC_SINGLE;\r
264 uint8_t block0[16];\r
265 memset(block0, 0x00, sizeof(block0));\r
c2731f37 266\r
267 int old = mfCGetBlock(0, block0, params);\r
d294f582 268 if (old == 0)\r
c2731f37 269 PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));\r
d294f582 270 else \r
271 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0."); \r
3bba7dea
JH		 272\r
273 // fill in the new values\r
274 // UID\r
275 memcpy(block0, uid, 4); \r
276 // Mifare UID BCC\r
277 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
278 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
c2731f37 279 if ( sak != NULL )\r
3bba7dea 280 block0[5]=sak[0];\r
c2731f37 281 \r
282 if ( atqa != NULL ) {\r
3bba7dea
JH		 283 block0[6]=atqa[1];\r
284 block0[7]=atqa[0];\r
80b1b53f 285 }\r
3bba7dea 286 PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r
c2731f37 287 \r
288 if ( wipecard ) params |= MAGIC_WIPE; \r
289 if ( oldUID == NULL) params |= MAGIC_UID;\r
290 \r
291 return mfCSetBlock(0, block0, oldUID, params);\r
f774db95
M		 292}\r
293\r
c2731f37 294int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {\r
0675f200 295\r
1b492a97 296 uint8_t isOK = 0;\r
c2731f37 297 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};\r
f774db95 298 memcpy(c.d.asBytes, data, 16); \r
0de8e387 299 clearCommandBuffer();\r
300 SendCommand(&c);\r
1b492a97 301 UsbCommand resp;\r
c2731f37 302 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
902cb3c0 303 isOK = resp.arg[0] & 0xff;\r
80b1b53f 304 if (uid != NULL) \r
305 memcpy(uid, resp.d.asBytes, 4);\r
306 if (!isOK) \r
307 return 2;\r
0675f200
M		 308 } else {\r
309 PrintAndLog("Command execute timeout");\r
310 return 1;\r
311 }\r
312 return 0;\r
313}\r
545a1f38
M		 314\r
315int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
316 uint8_t isOK = 0;\r
c2731f37 317 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}}; \r
0de8e387 318 clearCommandBuffer();\r
545a1f38 319 SendCommand(&c);\r
0de8e387 320 UsbCommand resp;\r
902cb3c0 321 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
322 isOK = resp.arg[0] & 0xff;\r
323 memcpy(data, resp.d.asBytes, 16);\r
545a1f38
M		 324 if (!isOK) return 2;\r
325 } else {\r
326 PrintAndLog("Command execute timeout");\r
327 return 1;\r
328 }\r
329 return 0;\r
330}\r
55acbb2a
M		 331\r
332// SNIFFER\r
333\r
e0c635d1
M		 334// constants\r
335static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
336\r
55acbb2a 337// variables\r
e4691591 338char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
e0c635d1 339static uint8_t traceCard[4096] = {0x00};\r
e4691591 340static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
55acbb2a
M		 341static int traceState = TRACE_IDLE;\r
342static uint8_t traceCurBlock = 0;\r
343static uint8_t traceCurKey = 0;\r
344\r
345struct Crypto1State *traceCrypto1 = NULL;\r
346\r
046fd766 347struct Crypto1State *revstate = NULL;\r
348\r
349uint64_t key = 0;\r
350uint32_t ks2 = 0;\r
351uint32_t ks3 = 0;\r
55acbb2a 352\r
046fd766 353uint32_t uid = 0; // serial number\r
354uint32_t nt =0; // tag challenge\r
355uint32_t nr_enc =0; // encrypted reader challenge\r
356uint32_t ar_enc =0; // encrypted reader response\r
357uint32_t at_enc =0; // encrypted tag response\r
55acbb2a 358\r
e0c635d1
M		 359int isTraceCardEmpty(void) {\r
360 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
361}\r
55acbb2a 362\r
e0c635d1
M		 363int isBlockEmpty(int blockN) {\r
364 for (int i = 0; i < 16; i++) \r
365 if (traceCard[blockN * 16 + i] != 0) return 0;\r
55acbb2a 366\r
e0c635d1
M		 367 return 1;\r
368}\r
369\r
370int isBlockTrailer(int blockN) {\r
d294f582 371 return ((blockN & 0x03) == 0x03);\r
e0c635d1
M		 372}\r
373\r
374int loadTraceCard(uint8_t *tuid) {\r
375 FILE * f;\r
80b1b53f 376 char buf[64] = {0x00};\r
377 uint8_t buf8[64] = {0x00};\r
e0c635d1
M		 378 int i, blockNum;\r
379 \r
80b1b53f 380 if (!isTraceCardEmpty()) \r
381 saveTraceCard();\r
382 \r
55acbb2a
M		 383 memset(traceCard, 0x00, 4096);\r
384 memcpy(traceCard, tuid + 3, 4);\r
80b1b53f 385\r
e0c635d1
M		 386 FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
387\r
388 f = fopen(traceFileName, "r");\r
664bb5ae 389 if (!f) return 1;\r
e0c635d1
M		 390 \r
391 blockNum = 0;\r
e4691591 392 \r
e0c635d1 393 while(!feof(f)){\r
e4691591 394 \r
e0c635d1 395 memset(buf, 0, sizeof(buf));\r
759c16b3 396 if (fgets(buf, sizeof(buf), f) == NULL) {\r
046fd766 397 PrintAndLog("File reading error.");\r
1b492a97 398 fclose(f);\r
759c16b3 399 return 2;\r
046fd766 400 }\r
e0c635d1
M		 401\r
402 if (strlen(buf) < 32){\r
403 if (feof(f)) break;\r
404 PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
1b492a97 405 fclose(f);\r
e0c635d1
M		 406 return 2;\r
407 }\r
408 for (i = 0; i < 32; i += 2)\r
409 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
410\r
411 memcpy(traceCard + blockNum * 16, buf8, 16);\r
412\r
413 blockNum++;\r
414 }\r
415 fclose(f);\r
416\r
417 return 0;\r
418}\r
419\r
420int saveTraceCard(void) {\r
421 FILE * f;\r
422 \r
423 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
424 \r
425 f = fopen(traceFileName, "w+");\r
664bb5ae 426 if ( !f ) return 1;\r
e4691591 427 \r
e0c635d1
M		 428 for (int i = 0; i < 64; i++) { // blocks\r
429 for (int j = 0; j < 16; j++) // bytes\r
430 fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
431 fprintf(f,"\n");\r
432 }\r
433 fclose(f);\r
e0c635d1
M		 434 return 0;\r
435}\r
436\r
437int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
438\r
80b1b53f 439 if (traceCrypto1) \r
440 crypto1_destroy(traceCrypto1);\r
441\r
e0c635d1
M		 442 traceCrypto1 = NULL;\r
443\r
80b1b53f 444 if (wantSaveToEmlFile) \r
445 loadTraceCard(tuid);\r
446 \r
55acbb2a
M		 447 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
448 traceCard[5] = sak;\r
449 memcpy(&traceCard[6], atqa, 2);\r
450 traceCurBlock = 0;\r
451 uid = bytes_to_num(tuid + 3, 4);\r
452 \r
453 traceState = TRACE_IDLE;\r
454\r
455 return 0;\r
456}\r
457\r
458void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
459 uint8_t bt = 0;\r
460 int i;\r
461 \r
462 if (len != 1) {\r
463 for (i = 0; i < len; i++)\r
464 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
465 } else {\r
d294f582 466 bt = 0; \r
467 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 0)) << 0;\r
468 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 1)) << 1;\r
469 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 2)) << 2;\r
470 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], 3)) << 3; \r
55acbb2a
M		 471 data[0] = bt;\r
472 }\r
473 return;\r
474}\r
475\r
a501c82b 476int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
d294f582 477 \r
55acbb2a
M		 478 uint8_t data[64];\r
479\r
480 if (traceState == TRACE_ERROR) return 1;\r
d294f582 481 \r
55acbb2a
M		 482 if (len > 64) {\r
483 traceState = TRACE_ERROR;\r
484 return 1;\r
485 }\r
486 \r
487 memcpy(data, data_src, len);\r
488 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
489 mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
490 PrintAndLog("dec> %s", sprint_hex(data, len));\r
491 AddLogHex(logHexFileName, "dec> ", data, len); \r
492 }\r
493 \r
494 switch (traceState) {\r
495 case TRACE_IDLE: \r
8b6a93df
M		 496 // check packet crc16!\r
497 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
498 PrintAndLog("dec> CRC ERROR!!!");\r
499 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r
500 traceState = TRACE_ERROR; // do not decrypt the next commands\r
501 return 1;\r
502 }\r
55acbb2a
M		 503 \r
504 // AUTHENTICATION\r
a61b4976 505 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
55acbb2a
M		 506 traceState = TRACE_AUTH1;\r
507 traceCurBlock = data[1];\r
508 traceCurKey = data[0] == 60 ? 1:0;\r
509 return 0;\r
510 }\r
511\r
512 // READ\r
513 if ((len ==4) && ((data[0] == 0x30))) {\r
514 traceState = TRACE_READ_DATA;\r
515 traceCurBlock = data[1];\r
516 return 0;\r
517 }\r
518\r
519 // WRITE\r
520 if ((len ==4) && ((data[0] == 0xA0))) {\r
521 traceState = TRACE_WRITE_OK;\r
522 traceCurBlock = data[1];\r
523 return 0;\r
524 }\r
525\r
526 // HALT\r
527 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
528 traceState = TRACE_ERROR; // do not decrypt the next commands\r
529 return 0;\r
530 }\r
531 \r
532 return 0;\r
533 break;\r
534 \r
535 case TRACE_READ_DATA: \r
536 if (len == 18) {\r
537 traceState = TRACE_IDLE;\r
538\r
e0c635d1
M		 539 if (isBlockTrailer(traceCurBlock)) {\r
540 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
541 } else {\r
542 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
543 }\r
544 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 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_WRITE_OK: \r
a61b4976 553 if ((len == 1) && (data[0] == 0x0a)) {\r
55acbb2a
M		 554 traceState = TRACE_WRITE_DATA;\r
555\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_WRITE_DATA: \r
564 if (len == 18) {\r
565 traceState = TRACE_IDLE;\r
566\r
567 memcpy(traceCard + traceCurBlock * 16, data, 16);\r
e0c635d1 568 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 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_AUTH1: \r
577 if (len == 4) {\r
578 traceState = TRACE_AUTH2;\r
55acbb2a
M		 579 nt = bytes_to_num(data, 4);\r
580 return 0;\r
581 } else {\r
582 traceState = TRACE_ERROR;\r
583 return 1;\r
584 }\r
585 break;\r
586\r
587 case TRACE_AUTH2: \r
588 if (len == 8) {\r
589 traceState = TRACE_AUTH_OK;\r
590\r
591 nr_enc = bytes_to_num(data, 4);\r
592 ar_enc = bytes_to_num(data + 4, 4);\r
593 return 0;\r
594 } else {\r
595 traceState = TRACE_ERROR;\r
596 return 1;\r
597 }\r
598 break;\r
599\r
600 case TRACE_AUTH_OK: \r
601 if (len ==4) {\r
602 traceState = TRACE_IDLE;\r
603\r
604 at_enc = bytes_to_num(data, 4);\r
605 \r
606 // decode key here)\r
a61b4976 607 ks2 = ar_enc ^ prng_successor(nt, 64);\r
608 ks3 = at_enc ^ prng_successor(nt, 96);\r
609 revstate = lfsr_recovery64(ks2, ks3);\r
610 lfsr_rollback_word(revstate, 0, 0);\r
611 lfsr_rollback_word(revstate, 0, 0);\r
612 lfsr_rollback_word(revstate, nr_enc, 1);\r
613 lfsr_rollback_word(revstate, uid ^ nt, 0);\r
614\r
046fd766 615 crypto1_get_lfsr(revstate, &key);\r
616 printf("Key: %012"llx"\n",key);\r
617 AddLogUint64(logHexFileName, "key: ", key); \r
55acbb2a 618 \r
e0c635d1
M		 619 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
620 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
621 \r
55acbb2a 622 if (traceCurKey) {\r
046fd766 623 num_to_bytes(key, 6, traceCard + blockShift + 10);\r
55acbb2a 624 } else {\r
046fd766 625 num_to_bytes(key, 6, traceCard + blockShift);\r
55acbb2a 626 }\r
e0c635d1 627 if (wantSaveToEmlFile) saveTraceCard();\r
55acbb2a
M		 628\r
629 if (traceCrypto1) {\r
630 crypto1_destroy(traceCrypto1);\r
631 }\r
632 \r
633 // set cryptosystem state\r
634 traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
635 \r
636// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r
637\r
046fd766 638 /* traceCrypto1 = crypto1_create(key); // key in lfsr\r
55acbb2a
M		 639 crypto1_word(traceCrypto1, nt ^ uid, 0);\r
640 crypto1_word(traceCrypto1, ar, 1);\r
641 crypto1_word(traceCrypto1, 0, 0);\r
642 crypto1_word(traceCrypto1, 0, 0);*/\r
643 \r
644 return 0;\r
645 } else {\r
646 traceState = TRACE_ERROR;\r
647 return 1;\r
648 }\r
649 break;\r
650\r
651 default: \r
652 traceState = TRACE_ERROR;\r
653 return 1;\r
654 }\r
655\r
656 return 0;\r
657}\r
e98572a1 658\r
659int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
660 /*\r
661 uint32_t nt; // tag challenge\r
3bc7b13d 662 uint32_t nr_enc; // encrypted reader challenge\r
e98572a1 663 uint32_t ar_enc; // encrypted reader response\r
664 uint32_t at_enc; // encrypted tag response\r
665 */\r
3bc7b13d 666 struct Crypto1State *pcs = NULL;\r
667 \r
e98572a1 668 ks2 = ar_enc ^ prng_successor(nt, 64);\r
669 ks3 = at_enc ^ prng_successor(nt, 96);\r
3bc7b13d 670 \r
671 PrintAndLog("Decrypting data with:");\r
672 PrintAndLog(" nt: %08x",nt);\r
673 PrintAndLog(" ar_enc: %08x",ar_enc);\r
674 PrintAndLog(" at_enc: %08x",at_enc);\r
675 PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );\r
676\r
677 pcs = lfsr_recovery64(ks2, ks3);\r
678 mf_crypto1_decrypt(pcs, data, len, FALSE);\r
e98572a1 679 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
3bc7b13d 680 crypto1_destroy(pcs);\r
e98572a1 681 return 0;\r
682}\r
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