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Commit | Line | Data |
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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 | 19 | int 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 |
30 | int 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 | 36 | typedef \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 | |
56 | void* 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 | 70 | int 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 |
9492e0b0 | 72 | uint16_t i, len;\r |
f397b5cc | 73 | uint32_t uid;\r |
902cb3c0 | 74 | UsbCommand resp;\r |
f397b5cc | 75 | \r |
9492e0b0 | 76 | StateList_t statelists[2];\r |
77 | struct Crypto1State *p1, *p2, *p3, *p4;\r | |
78 | \r | |
f397b5cc | 79 | // flush queue\r |
7dd1908b | 80 | WaitForResponseTimeout(CMD_ACK,NULL,100);\r |
f397b5cc | 81 | \r |
9492e0b0 | 82 | UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r |
f397b5cc | 83 | memcpy(c.d.asBytes, key, 6);\r |
9492e0b0 | 84 | SendCommand(&c);\r |
f397b5cc | 85 | \r |
9492e0b0 | 86 | if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r |
87 | len = resp.arg[1];\r | |
88 | if (len == 2) { \r | |
902cb3c0 | 89 | memcpy(&uid, resp.d.asBytes, 4);\r |
9492e0b0 | 90 | PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r |
f397b5cc | 91 | \r |
9492e0b0 | 92 | for (i = 0; i < 2; i++) {\r |
93 | statelists[i].blockNo = resp.arg[2] & 0xff;\r | |
94 | statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r | |
95 | statelists[i].uid = uid;\r | |
f397b5cc | 96 | \r |
9492e0b0 | 97 | memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r |
98 | memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r | |
f397b5cc | 99 | }\r |
9492e0b0 | 100 | }\r |
101 | else {\r | |
102 | PrintAndLog("Got 0 keys from proxmark."); \r | |
103 | return 1;\r | |
f397b5cc M |
104 | }\r |
105 | }\r | |
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 | |
186 | if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, 1, keyBlock, &key64)) {\r | |
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 |
193 | free(statelists[1].head.slhead);\r | |
9492e0b0 | 194 | \r |
f397b5cc M |
195 | return 0;\r |
196 | }\r | |
197 | \r | |
198 | int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r | |
9492e0b0 | 199 | \r |
f397b5cc M |
200 | *key = 0;\r |
201 | \r | |
9492e0b0 | 202 | UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};\r |
f397b5cc | 203 | memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r |
9492e0b0 | 204 | SendCommand(&c);\r |
f397b5cc | 205 | \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 | 215 | int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r |
545a1f38 | 216 | UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r |
902cb3c0 | 217 | SendCommand(&c);\r |
8556b852 | 218 | \r |
902cb3c0 | 219 | UsbCommand resp;\r |
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 | |
225 | int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r | |
545a1f38 | 226 | UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};\r |
8556b852 | 227 | memcpy(c.d.asBytes, data, blocksCount * 16); \r |
545a1f38 | 228 | SendCommand(&c);\r |
8556b852 M |
229 | return 0;\r |
230 | }\r | |
231 | \r | |
55acbb2a M |
232 | // "MAGIC" CARD\r |
233 | \r | |
3bba7dea | 234 | int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool wantWipe) {\r |
80b1b53f | 235 | uint8_t oldblock0[16] = {0x00};\r |
3fe4ff4f | 236 | uint8_t block0[16] = {0x00};\r |
3bba7dea | 237 | \r |
80b1b53f | 238 | int old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);\r |
3bba7dea JH |
239 | if (old == 0) {\r |
240 | memcpy(block0, oldblock0, 16);\r | |
241 | PrintAndLog("old block 0: %s", sprint_hex(block0,16));\r | |
80b1b53f | 242 | } else {\r |
3bba7dea JH |
243 | PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r |
244 | }\r | |
245 | \r | |
246 | // fill in the new values\r | |
247 | // UID\r | |
248 | memcpy(block0, uid, 4); \r | |
249 | // Mifare UID BCC\r | |
250 | block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r | |
251 | // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r | |
252 | if (sak!=NULL)\r | |
253 | block0[5]=sak[0];\r | |
254 | if (atqa!=NULL) {\r | |
255 | block0[6]=atqa[1];\r | |
256 | block0[7]=atqa[0];\r | |
80b1b53f | 257 | }\r |
3bba7dea | 258 | PrintAndLog("new block 0: %s", sprint_hex(block0,16));\r |
208a0166 | 259 | return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);\r |
f774db95 M |
260 | }\r |
261 | \r | |
6a1f2d82 | 262 | int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {\r |
0675f200 | 263 | \r |
3fe4ff4f | 264 | uint8_t isOK = 0;\r |
265 | UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};\r | |
f774db95 | 266 | memcpy(c.d.asBytes, data, 16); \r |
545a1f38 | 267 | SendCommand(&c);\r |
0675f200 | 268 | \r |
902cb3c0 | 269 | UsbCommand resp;\r |
270 | if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r | |
271 | isOK = resp.arg[0] & 0xff;\r | |
80b1b53f | 272 | if (uid != NULL) \r |
273 | memcpy(uid, resp.d.asBytes, 4);\r | |
274 | if (!isOK) \r | |
275 | return 2;\r | |
0675f200 M |
276 | } else {\r |
277 | PrintAndLog("Command execute timeout");\r | |
278 | return 1;\r | |
279 | }\r | |
280 | return 0;\r | |
281 | }\r | |
545a1f38 M |
282 | \r |
283 | int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r | |
284 | uint8_t isOK = 0;\r | |
285 | \r | |
3fe4ff4f | 286 | UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};\r |
545a1f38 M |
287 | SendCommand(&c);\r |
288 | \r | |
902cb3c0 | 289 | UsbCommand resp;\r |
290 | if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r | |
291 | isOK = resp.arg[0] & 0xff;\r | |
292 | memcpy(data, resp.d.asBytes, 16);\r | |
545a1f38 M |
293 | if (!isOK) return 2;\r |
294 | } else {\r | |
295 | PrintAndLog("Command execute timeout");\r | |
296 | return 1;\r | |
297 | }\r | |
298 | return 0;\r | |
299 | }\r | |
55acbb2a M |
300 | \r |
301 | // SNIFFER\r | |
302 | \r | |
e0c635d1 M |
303 | // constants\r |
304 | static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r | |
305 | \r | |
55acbb2a | 306 | // variables\r |
e4691591 | 307 | char logHexFileName[FILE_PATH_SIZE] = {0x00};\r |
e0c635d1 | 308 | static uint8_t traceCard[4096] = {0x00};\r |
e4691591 | 309 | static char traceFileName[FILE_PATH_SIZE] = {0x00};\r |
55acbb2a M |
310 | static int traceState = TRACE_IDLE;\r |
311 | static uint8_t traceCurBlock = 0;\r | |
312 | static uint8_t traceCurKey = 0;\r | |
313 | \r | |
314 | struct Crypto1State *traceCrypto1 = NULL;\r | |
315 | \r | |
316 | struct Crypto1State *revstate;\r | |
317 | uint64_t lfsr;\r | |
318 | uint32_t ks2;\r | |
319 | uint32_t ks3;\r | |
320 | \r | |
321 | uint32_t uid; // serial number\r | |
322 | uint32_t nt; // tag challenge\r | |
323 | uint32_t nr_enc; // encrypted reader challenge\r | |
324 | uint32_t ar_enc; // encrypted reader response\r | |
325 | uint32_t at_enc; // encrypted tag response\r | |
326 | \r | |
e0c635d1 M |
327 | int isTraceCardEmpty(void) {\r |
328 | return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r | |
329 | }\r | |
55acbb2a | 330 | \r |
e0c635d1 M |
331 | int isBlockEmpty(int blockN) {\r |
332 | for (int i = 0; i < 16; i++) \r | |
333 | if (traceCard[blockN * 16 + i] != 0) return 0;\r | |
55acbb2a | 334 | \r |
e0c635d1 M |
335 | return 1;\r |
336 | }\r | |
337 | \r | |
338 | int isBlockTrailer(int blockN) {\r | |
339 | return ((blockN & 0x03) == 0x03);\r | |
340 | }\r | |
341 | \r | |
342 | int loadTraceCard(uint8_t *tuid) {\r | |
343 | FILE * f;\r | |
80b1b53f | 344 | char buf[64] = {0x00};\r |
345 | uint8_t buf8[64] = {0x00};\r | |
e0c635d1 M |
346 | int i, blockNum;\r |
347 | \r | |
80b1b53f | 348 | if (!isTraceCardEmpty()) \r |
349 | saveTraceCard();\r | |
350 | \r | |
55acbb2a M |
351 | memset(traceCard, 0x00, 4096);\r |
352 | memcpy(traceCard, tuid + 3, 4);\r | |
80b1b53f | 353 | \r |
e0c635d1 M |
354 | FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r |
355 | \r | |
356 | f = fopen(traceFileName, "r");\r | |
e6432f05 | 357 | if (!f) return 1;\r |
e0c635d1 M |
358 | \r |
359 | blockNum = 0;\r | |
e4691591 | 360 | \r |
e0c635d1 | 361 | while(!feof(f)){\r |
e4691591 | 362 | \r |
e0c635d1 | 363 | memset(buf, 0, sizeof(buf));\r |
759c16b3 | 364 | if (fgets(buf, sizeof(buf), f) == NULL) {\r |
ca4714cd MHS |
365 | PrintAndLog("File reading error.");\r |
366 | fclose(f);\r | |
759c16b3 | 367 | return 2;\r |
ca4714cd | 368 | }\r |
e0c635d1 M |
369 | \r |
370 | if (strlen(buf) < 32){\r | |
371 | if (feof(f)) break;\r | |
372 | PrintAndLog("File content error. Block data must include 32 HEX symbols");\r | |
ca4714cd | 373 | fclose(f);\r |
e0c635d1 M |
374 | return 2;\r |
375 | }\r | |
376 | for (i = 0; i < 32; i += 2)\r | |
377 | sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r | |
378 | \r | |
379 | memcpy(traceCard + blockNum * 16, buf8, 16);\r | |
380 | \r | |
381 | blockNum++;\r | |
382 | }\r | |
383 | fclose(f);\r | |
384 | \r | |
385 | return 0;\r | |
386 | }\r | |
387 | \r | |
388 | int saveTraceCard(void) {\r | |
389 | FILE * f;\r | |
390 | \r | |
391 | if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r | |
392 | \r | |
393 | f = fopen(traceFileName, "w+");\r | |
e6432f05 | 394 | if ( !f ) return 1;\r |
e4691591 | 395 | \r |
e0c635d1 M |
396 | for (int i = 0; i < 64; i++) { // blocks\r |
397 | for (int j = 0; j < 16; j++) // bytes\r | |
398 | fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r | |
399 | fprintf(f,"\n");\r | |
400 | }\r | |
401 | fclose(f);\r | |
e0c635d1 M |
402 | return 0;\r |
403 | }\r | |
404 | \r | |
405 | int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r | |
406 | \r | |
80b1b53f | 407 | if (traceCrypto1) \r |
408 | crypto1_destroy(traceCrypto1);\r | |
409 | \r | |
e0c635d1 M |
410 | traceCrypto1 = NULL;\r |
411 | \r | |
80b1b53f | 412 | if (wantSaveToEmlFile) \r |
413 | loadTraceCard(tuid);\r | |
414 | \r | |
55acbb2a M |
415 | traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r |
416 | traceCard[5] = sak;\r | |
417 | memcpy(&traceCard[6], atqa, 2);\r | |
418 | traceCurBlock = 0;\r | |
419 | uid = bytes_to_num(tuid + 3, 4);\r | |
420 | \r | |
421 | traceState = TRACE_IDLE;\r | |
422 | \r | |
423 | return 0;\r | |
424 | }\r | |
425 | \r | |
426 | void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r | |
427 | uint8_t bt = 0;\r | |
428 | int i;\r | |
429 | \r | |
430 | if (len != 1) {\r | |
431 | for (i = 0; i < len; i++)\r | |
432 | data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r | |
433 | } else {\r | |
434 | bt = 0;\r | |
435 | for (i = 0; i < 4; i++)\r | |
436 | bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r | |
437 | \r | |
438 | data[0] = bt;\r | |
439 | }\r | |
440 | return;\r | |
441 | }\r | |
442 | \r | |
443 | \r | |
6a1f2d82 | 444 | int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r |
55acbb2a M |
445 | uint8_t data[64];\r |
446 | \r | |
447 | if (traceState == TRACE_ERROR) return 1;\r | |
448 | if (len > 64) {\r | |
449 | traceState = TRACE_ERROR;\r | |
450 | return 1;\r | |
451 | }\r | |
452 | \r | |
453 | memcpy(data, data_src, len);\r | |
454 | if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r | |
455 | mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r | |
456 | PrintAndLog("dec> %s", sprint_hex(data, len));\r | |
457 | AddLogHex(logHexFileName, "dec> ", data, len); \r | |
458 | }\r | |
459 | \r | |
460 | switch (traceState) {\r | |
461 | case TRACE_IDLE: \r | |
8b6a93df M |
462 | // check packet crc16!\r |
463 | if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r | |
464 | PrintAndLog("dec> CRC ERROR!!!");\r | |
465 | AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); \r | |
466 | traceState = TRACE_ERROR; // do not decrypt the next commands\r | |
467 | return 1;\r | |
468 | }\r | |
55acbb2a M |
469 | \r |
470 | // AUTHENTICATION\r | |
471 | if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r | |
472 | traceState = TRACE_AUTH1;\r | |
473 | traceCurBlock = data[1];\r | |
474 | traceCurKey = data[0] == 60 ? 1:0;\r | |
475 | return 0;\r | |
476 | }\r | |
477 | \r | |
478 | // READ\r | |
479 | if ((len ==4) && ((data[0] == 0x30))) {\r | |
480 | traceState = TRACE_READ_DATA;\r | |
481 | traceCurBlock = data[1];\r | |
482 | return 0;\r | |
483 | }\r | |
484 | \r | |
485 | // WRITE\r | |
486 | if ((len ==4) && ((data[0] == 0xA0))) {\r | |
487 | traceState = TRACE_WRITE_OK;\r | |
488 | traceCurBlock = data[1];\r | |
489 | return 0;\r | |
490 | }\r | |
491 | \r | |
492 | // HALT\r | |
493 | if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r | |
494 | traceState = TRACE_ERROR; // do not decrypt the next commands\r | |
495 | return 0;\r | |
496 | }\r | |
497 | \r | |
498 | return 0;\r | |
499 | break;\r | |
500 | \r | |
501 | case TRACE_READ_DATA: \r | |
502 | if (len == 18) {\r | |
503 | traceState = TRACE_IDLE;\r | |
504 | \r | |
e0c635d1 M |
505 | if (isBlockTrailer(traceCurBlock)) {\r |
506 | memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r | |
507 | } else {\r | |
508 | memcpy(traceCard + traceCurBlock * 16, data, 16);\r | |
509 | }\r | |
510 | if (wantSaveToEmlFile) saveTraceCard();\r | |
55acbb2a M |
511 | return 0;\r |
512 | } else {\r | |
513 | traceState = TRACE_ERROR;\r | |
514 | return 1;\r | |
515 | }\r | |
516 | break;\r | |
517 | \r | |
518 | case TRACE_WRITE_OK: \r | |
97d582a6 | 519 | if ((len == 1) && (data[0] == 0x0a)) {\r |
55acbb2a M |
520 | traceState = TRACE_WRITE_DATA;\r |
521 | \r | |
522 | return 0;\r | |
523 | } else {\r | |
524 | traceState = TRACE_ERROR;\r | |
525 | return 1;\r | |
526 | }\r | |
527 | break;\r | |
528 | \r | |
529 | case TRACE_WRITE_DATA: \r | |
530 | if (len == 18) {\r | |
531 | traceState = TRACE_IDLE;\r | |
532 | \r | |
533 | memcpy(traceCard + traceCurBlock * 16, data, 16);\r | |
e0c635d1 | 534 | if (wantSaveToEmlFile) saveTraceCard();\r |
55acbb2a M |
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_AUTH1: \r | |
543 | if (len == 4) {\r | |
544 | traceState = TRACE_AUTH2;\r | |
55acbb2a M |
545 | nt = bytes_to_num(data, 4);\r |
546 | return 0;\r | |
547 | } else {\r | |
548 | traceState = TRACE_ERROR;\r | |
549 | return 1;\r | |
550 | }\r | |
551 | break;\r | |
552 | \r | |
553 | case TRACE_AUTH2: \r | |
554 | if (len == 8) {\r | |
555 | traceState = TRACE_AUTH_OK;\r | |
556 | \r | |
557 | nr_enc = bytes_to_num(data, 4);\r | |
558 | ar_enc = bytes_to_num(data + 4, 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_AUTH_OK: \r | |
567 | if (len ==4) {\r | |
568 | traceState = TRACE_IDLE;\r | |
569 | \r | |
570 | at_enc = bytes_to_num(data, 4);\r | |
571 | \r | |
572 | // decode key here)\r | |
97d582a6 MHS |
573 | ks2 = ar_enc ^ prng_successor(nt, 64);\r |
574 | ks3 = at_enc ^ prng_successor(nt, 96);\r | |
575 | revstate = lfsr_recovery64(ks2, ks3);\r | |
576 | lfsr_rollback_word(revstate, 0, 0);\r | |
577 | lfsr_rollback_word(revstate, 0, 0);\r | |
578 | lfsr_rollback_word(revstate, nr_enc, 1);\r | |
579 | lfsr_rollback_word(revstate, uid ^ nt, 0);\r | |
3fe4ff4f | 580 | \r |
55acbb2a M |
581 | crypto1_get_lfsr(revstate, &lfsr);\r |
582 | printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));\r | |
583 | AddLogUint64(logHexFileName, "key> ", lfsr); \r | |
584 | \r | |
e0c635d1 M |
585 | int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r |
586 | if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r | |
587 | \r | |
55acbb2a | 588 | if (traceCurKey) {\r |
e0c635d1 | 589 | num_to_bytes(lfsr, 6, traceCard + blockShift + 10);\r |
55acbb2a | 590 | } else {\r |
e0c635d1 | 591 | num_to_bytes(lfsr, 6, traceCard + blockShift);\r |
55acbb2a | 592 | }\r |
e0c635d1 | 593 | if (wantSaveToEmlFile) saveTraceCard();\r |
55acbb2a M |
594 | \r |
595 | if (traceCrypto1) {\r | |
596 | crypto1_destroy(traceCrypto1);\r | |
597 | }\r | |
598 | \r | |
599 | // set cryptosystem state\r | |
600 | traceCrypto1 = lfsr_recovery64(ks2, ks3);\r | |
601 | \r | |
602 | // nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r | |
603 | \r | |
604 | /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr\r | |
605 | crypto1_word(traceCrypto1, nt ^ uid, 0);\r | |
606 | crypto1_word(traceCrypto1, ar, 1);\r | |
607 | crypto1_word(traceCrypto1, 0, 0);\r | |
608 | crypto1_word(traceCrypto1, 0, 0);*/\r | |
609 | \r | |
610 | return 0;\r | |
611 | } else {\r | |
612 | traceState = TRACE_ERROR;\r | |
613 | return 1;\r | |
614 | }\r | |
615 | break;\r | |
616 | \r | |
617 | default: \r | |
618 | traceState = TRACE_ERROR;\r | |
619 | return 1;\r | |
620 | }\r | |
621 | \r | |
622 | return 0;\r | |
623 | }\r |