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1 //-----------------------------------------------------------------------------
2 // Copyright (C) Merlok - 2017
3 //
4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
5 // at your option, any later version. See the LICENSE.txt file for the text of
6 // the license.
7 //-----------------------------------------------------------------------------
8 // Command: hf mf list. It shows data from arm buffer.
9 //-----------------------------------------------------------------------------
10
11 #include "cmdhflist.h"
12
13 #include <stdlib.h>
14 #include <stdio.h>
15 #include <string.h>
16 #include <stdint.h>
17 #include <stdbool.h>
18 #include "util.h"
19 #include "ui.h"
20 #include "iso14443crc.h"
21 #include "parity.h"
22 #include "protocols.h"
23 #include "crapto1/crapto1.h"
24 #include "mifarehost.h"
25 #include "mifaredefault.h"
26
27
28 enum MifareAuthSeq {
29 masNone,
30 masNt,
31 masNrAr,
32 masAt,
33 masAuthComplete,
34 masFirstData,
35 masData,
36 masError,
37 };
38 static enum MifareAuthSeq MifareAuthState;
39 static TAuthData AuthData;
40
41 void ClearAuthData() {
42 AuthData.uid = 0;
43 AuthData.nt = 0;
44 AuthData.first_auth = true;
45 AuthData.ks2 = 0;
46 AuthData.ks3 = 0;
47 }
48
49 /**
50 * @brief iso14443A_CRC_check Checks CRC in command or response
51 * @param isResponse
52 * @param data
53 * @param len
54 * @return 0 : CRC-command, CRC not ok
55 * 1 : CRC-command, CRC ok
56 * 2 : Not crc-command
57 */
58 uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
59 {
60 uint8_t b1,b2;
61
62 if(len <= 2) return 2;
63
64 if(isResponse & (len < 6)) return 2;
65
66 ComputeCrc14443(CRC_14443_A, data, len-2, &b1, &b2);
67 if (b1 != data[len-2] || b2 != data[len-1]) {
68 return 0;
69 } else {
70 return 1;
71 }
72 }
73
74 uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
75 {
76 switch(MifareAuthState) {
77 case masNone:
78 case masError:
79 return iso14443A_CRC_check(isResponse, data, len);
80 default:
81 return 2;
82 }
83 }
84
85 void annotateIclass(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
86 {
87 switch(cmd[0])
88 {
89 case ICLASS_CMD_ACTALL: snprintf(exp,size,"ACTALL"); break;
90 case ICLASS_CMD_READ_OR_IDENTIFY:{
91 if(cmdsize > 1){
92 snprintf(exp,size,"READ(%d)",cmd[1]);
93 }else{
94 snprintf(exp,size,"IDENTIFY");
95 }
96 break;
97 }
98 case ICLASS_CMD_SELECT: snprintf(exp,size,"SELECT"); break;
99 case ICLASS_CMD_PAGESEL: snprintf(exp,size,"PAGESEL(%d)", cmd[1]); break;
100 case ICLASS_CMD_READCHECK_KC:snprintf(exp,size,"READCHECK[Kc](%d)", cmd[1]); break;
101 case ICLASS_CMD_READCHECK_KD:snprintf(exp,size,"READCHECK[Kd](%d)", cmd[1]); break;
102 case ICLASS_CMD_CHECK: snprintf(exp,size,"CHECK"); break;
103 case ICLASS_CMD_DETECT: snprintf(exp,size,"DETECT"); break;
104 case ICLASS_CMD_HALT: snprintf(exp,size,"HALT"); break;
105 case ICLASS_CMD_UPDATE: snprintf(exp,size,"UPDATE(%d)",cmd[1]); break;
106 case ICLASS_CMD_ACT: snprintf(exp,size,"ACT"); break;
107 case ICLASS_CMD_READ4: snprintf(exp,size,"READ4(%d)",cmd[1]); break;
108 default: snprintf(exp,size,"?"); break;
109 }
110 return;
111 }
112
113 void annotateIso15693(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
114 {
115
116 if(cmd[0] == 0x26)
117 {
118 switch(cmd[1]){
119 case ISO15693_INVENTORY :snprintf(exp, size, "INVENTORY");break;
120 case ISO15693_STAYQUIET :snprintf(exp, size, "STAY_QUIET");break;
121 default: snprintf(exp,size,"?"); break;
122
123 }
124 }else if(cmd[0] == 0x02)
125 {
126 switch(cmd[1])
127 {
128 case ISO15693_READBLOCK :snprintf(exp, size, "READBLOCK");break;
129 case ISO15693_WRITEBLOCK :snprintf(exp, size, "WRITEBLOCK");break;
130 case ISO15693_LOCKBLOCK :snprintf(exp, size, "LOCKBLOCK");break;
131 case ISO15693_READ_MULTI_BLOCK :snprintf(exp, size, "READ_MULTI_BLOCK");break;
132 case ISO15693_SELECT :snprintf(exp, size, "SELECT");break;
133 case ISO15693_RESET_TO_READY :snprintf(exp, size, "RESET_TO_READY");break;
134 case ISO15693_WRITE_AFI :snprintf(exp, size, "WRITE_AFI");break;
135 case ISO15693_LOCK_AFI :snprintf(exp, size, "LOCK_AFI");break;
136 case ISO15693_WRITE_DSFID :snprintf(exp, size, "WRITE_DSFID");break;
137 case ISO15693_LOCK_DSFID :snprintf(exp, size, "LOCK_DSFID");break;
138 case ISO15693_GET_SYSTEM_INFO :snprintf(exp, size, "GET_SYSTEM_INFO");break;
139 case ISO15693_READ_MULTI_SECSTATUS :snprintf(exp, size, "READ_MULTI_SECSTATUS");break;
140 default: snprintf(exp,size,"?"); break;
141 }
142 }
143 }
144
145
146 void annotateTopaz(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
147 {
148 switch(cmd[0]) {
149 case TOPAZ_REQA :snprintf(exp, size, "REQA");break;
150 case TOPAZ_WUPA :snprintf(exp, size, "WUPA");break;
151 case TOPAZ_RID :snprintf(exp, size, "RID");break;
152 case TOPAZ_RALL :snprintf(exp, size, "RALL");break;
153 case TOPAZ_READ :snprintf(exp, size, "READ");break;
154 case TOPAZ_WRITE_E :snprintf(exp, size, "WRITE-E");break;
155 case TOPAZ_WRITE_NE :snprintf(exp, size, "WRITE-NE");break;
156 case TOPAZ_RSEG :snprintf(exp, size, "RSEG");break;
157 case TOPAZ_READ8 :snprintf(exp, size, "READ8");break;
158 case TOPAZ_WRITE_E8 :snprintf(exp, size, "WRITE-E8");break;
159 case TOPAZ_WRITE_NE8 :snprintf(exp, size, "WRITE-NE8");break;
160 default: snprintf(exp,size,"?"); break;
161 }
162 }
163
164
165 /**
166 06 00 = INITIATE
167 0E xx = SELECT ID (xx = Chip-ID)
168 0B = Get UID
169 08 yy = Read Block (yy = block number)
170 09 yy dd dd dd dd = Write Block (yy = block number; dd dd dd dd = data to be written)
171 0C = Reset to Inventory
172 0F = Completion
173 0A 11 22 33 44 55 66 = Authenticate (11 22 33 44 55 66 = data to authenticate)
174 **/
175
176 void annotateIso14443b(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
177 {
178 switch(cmd[0]){
179 case ISO14443B_REQB : snprintf(exp,size,"REQB");break;
180 case ISO14443B_ATTRIB : snprintf(exp,size,"ATTRIB");break;
181 case ISO14443B_HALT : snprintf(exp,size,"HALT");break;
182 case ISO14443B_INITIATE : snprintf(exp,size,"INITIATE");break;
183 case ISO14443B_SELECT : snprintf(exp,size,"SELECT(%d)",cmd[1]);break;
184 case ISO14443B_GET_UID : snprintf(exp,size,"GET UID");break;
185 case ISO14443B_READ_BLK : snprintf(exp,size,"READ_BLK(%d)", cmd[1]);break;
186 case ISO14443B_WRITE_BLK : snprintf(exp,size,"WRITE_BLK(%d)",cmd[1]);break;
187 case ISO14443B_RESET : snprintf(exp,size,"RESET");break;
188 case ISO14443B_COMPLETION : snprintf(exp,size,"COMPLETION");break;
189 case ISO14443B_AUTHENTICATE : snprintf(exp,size,"AUTHENTICATE");break;
190 default : snprintf(exp,size ,"?");break;
191 }
192
193 }
194
195 void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
196 {
197 switch(cmd[0])
198 {
199 case ISO14443A_CMD_WUPA:
200 snprintf(exp,size,"WUPA");
201 break;
202 case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
203 // 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
204 // 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
205 if(cmd[1] == 0x70)
206 {
207 snprintf(exp,size,"SELECT_UID"); break;
208 }else
209 {
210 snprintf(exp,size,"ANTICOLL"); break;
211 }
212 }
213 case ISO14443A_CMD_ANTICOLL_OR_SELECT_2:{
214 //95 20 = Anticollision of cascade level2
215 //95 70 = Select of cascade level2
216 if(cmd[2] == 0x70)
217 {
218 snprintf(exp,size,"SELECT_UID-2"); break;
219 }else
220 {
221 snprintf(exp,size,"ANTICOLL-2"); break;
222 }
223 }
224 case ISO14443A_CMD_REQA:
225 snprintf(exp,size,"REQA");
226 break;
227 case ISO14443A_CMD_READBLOCK: snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
228 case ISO14443A_CMD_WRITEBLOCK: snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
229 case ISO14443A_CMD_HALT:
230 snprintf(exp,size,"HALT");
231 MifareAuthState = masNone;
232 break;
233 case ISO14443A_CMD_RATS: snprintf(exp,size,"RATS"); break;
234 case MIFARE_CMD_INC: snprintf(exp,size,"INC(%d)",cmd[1]); break;
235 case MIFARE_CMD_DEC: snprintf(exp,size,"DEC(%d)",cmd[1]); break;
236 case MIFARE_CMD_RESTORE: snprintf(exp,size,"RESTORE(%d)",cmd[1]); break;
237 case MIFARE_CMD_TRANSFER: snprintf(exp,size,"TRANSFER(%d)",cmd[1]); break;
238 case MIFARE_AUTH_KEYA:
239 if ( cmdsize > 3) {
240 snprintf(exp,size,"AUTH-A(%d)",cmd[1]);
241 MifareAuthState = masNt;
242 } else {
243 // case MIFARE_ULEV1_VERSION : both 0x60.
244 snprintf(exp,size,"EV1 VERSION");
245 }
246 break;
247 case MIFARE_AUTH_KEYB:
248 MifareAuthState = masNt;
249 snprintf(exp,size,"AUTH-B(%d)",cmd[1]);
250 break;
251 case MIFARE_MAGICWUPC1: snprintf(exp,size,"MAGIC WUPC1"); break;
252 case MIFARE_MAGICWUPC2: snprintf(exp,size,"MAGIC WUPC2"); break;
253 case MIFARE_MAGICWIPEC: snprintf(exp,size,"MAGIC WIPEC"); break;
254 case MIFARE_ULC_AUTH_1: snprintf(exp,size,"AUTH "); break;
255 case MIFARE_ULC_AUTH_2: snprintf(exp,size,"AUTH_ANSW"); break;
256 case MIFARE_ULEV1_AUTH:
257 if ( cmdsize == 7 )
258 snprintf(exp,size,"PWD-AUTH KEY: 0x%02x%02x%02x%02x", cmd[1], cmd[2], cmd[3], cmd[4] );
259 else
260 snprintf(exp,size,"PWD-AUTH");
261 break;
262 case MIFARE_ULEV1_FASTREAD:{
263 if ( cmdsize >=3 && cmd[2] <= 0xE6)
264 snprintf(exp,size,"READ RANGE (%d-%d)",cmd[1],cmd[2]);
265 else
266 snprintf(exp,size,"?");
267 break;
268 }
269 case MIFARE_ULC_WRITE:{
270 if ( cmd[1] < 0x21 )
271 snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]);
272 else
273 snprintf(exp,size,"?");
274 break;
275 }
276 case MIFARE_ULEV1_READ_CNT:{
277 if ( cmd[1] < 5 )
278 snprintf(exp,size,"READ CNT(%d)",cmd[1]);
279 else
280 snprintf(exp,size,"?");
281 break;
282 }
283 case MIFARE_ULEV1_INCR_CNT:{
284 if ( cmd[1] < 5 )
285 snprintf(exp,size,"INCR(%d)",cmd[1]);
286 else
287 snprintf(exp,size,"?");
288 break;
289 }
290 case MIFARE_ULEV1_READSIG: snprintf(exp,size,"READ_SIG"); break;
291 case MIFARE_ULEV1_CHECKTEAR: snprintf(exp,size,"CHK_TEARING(%d)",cmd[1]); break;
292 case MIFARE_ULEV1_VCSL: snprintf(exp,size,"VCSL"); break;
293 default: snprintf(exp,size,"?"); break;
294 }
295 return;
296 }
297
298 void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
299 if (!isResponse && cmdsize == 1) {
300 switch(cmd[0]) {
301 case ISO14443A_CMD_WUPA:
302 case ISO14443A_CMD_REQA:
303 MifareAuthState = masNone;
304 break;
305 default:
306 break;
307 }
308 }
309
310 // get UID
311 if (MifareAuthState == masNone) {
312 if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
313 ClearAuthData();
314 AuthData.uid = bytes_to_num(&cmd[2], 4);
315 }
316 if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
317 ClearAuthData();
318 AuthData.uid = bytes_to_num(&cmd[2], 4);
319 }
320 }
321
322 switch(MifareAuthState) {
323 case masNt:
324 if (cmdsize == 4 && isResponse) {
325 snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
326 MifareAuthState = masNrAr;
327 if (AuthData.first_auth) {
328 AuthData.nt = bytes_to_num(cmd, 4);
329 } else {
330 AuthData.nt_enc = bytes_to_num(cmd, 4);
331 AuthData.nt_enc_par = parity[0];
332 }
333 return;
334 } else {
335 MifareAuthState = masError;
336 }
337 break;
338 case masNrAr:
339 if (cmdsize == 8 && !isResponse) {
340 snprintf(exp,size,"AUTH: nr ar (enc)");
341 MifareAuthState = masAt;
342 AuthData.nr_enc = bytes_to_num(cmd, 4);
343 AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
344 AuthData.ar_enc_par = parity[0] << 4;
345 return;
346 } else {
347 MifareAuthState = masError;
348 }
349 break;
350 case masAt:
351 if (cmdsize == 4 && isResponse) {
352 snprintf(exp,size,"AUTH: at (enc)");
353 MifareAuthState = masAuthComplete;
354 AuthData.at_enc = bytes_to_num(cmd, 4);
355 AuthData.at_enc_par = parity[0];
356 return;
357 } else {
358 MifareAuthState = masError;
359 }
360 break;
361 default:
362 break;
363 }
364
365 if (!isResponse && ((MifareAuthState == masNone) || (MifareAuthState == masError)))
366 annotateIso14443a(exp, size, cmd, cmdsize);
367
368 }
369
370 bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, uint8_t *parity, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
371 static struct Crypto1State *traceCrypto1;
372 static uint64_t mfLastKey;
373
374 *mfDataLen = 0;
375
376 if (MifareAuthState == masAuthComplete) {
377 if (traceCrypto1) {
378 crypto1_destroy(traceCrypto1);
379 traceCrypto1 = NULL;
380 }
381
382 MifareAuthState = masFirstData;
383 return false;
384 }
385
386 if (cmdsize > 32)
387 return false;
388
389 if (MifareAuthState == masFirstData) {
390 if (AuthData.first_auth) {
391 AuthData.ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
392 AuthData.ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
393
394 mfLastKey = GetCrypto1ProbableKey(&AuthData);
395 PrintAndLog(" | * | key | probable key:%012"PRIx64" Prng:%s ks2:%08x ks3:%08x | |",
396 mfLastKey,
397 validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
398 AuthData.ks2,
399 AuthData.ks3);
400
401 AuthData.first_auth = false;
402
403 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
404 } else {
405 if (traceCrypto1) {
406 crypto1_destroy(traceCrypto1);
407 traceCrypto1 = NULL;
408 }
409
410 // check last used key
411 if (mfLastKey) {
412 if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize, parity)) {
413 PrintAndLog(" | * | key | last used key:%012"PRIx64" ks2:%08x ks3:%08x | |",
414 mfLastKey,
415 AuthData.ks2,
416 AuthData.ks3);
417
418 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
419 };
420 }
421
422 // check default keys
423 if (!traceCrypto1) {
424 for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
425 if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize, parity)) {
426 PrintAndLog(" | * | key | default key:%012"PRIx64" ks2:%08x ks3:%08x | |",
427 MifareDefaultKeys[defaultKeyCounter],
428 AuthData.ks2,
429 AuthData.ks3);
430
431 mfLastKey = MifareDefaultKeys[defaultKeyCounter];
432 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
433 break;
434 };
435 }
436 }
437
438 // nested
439 if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
440 uint32_t ntx = prng_successor(AuthData.nt, 90);
441 for (int i = 0; i < 16383; i++) {
442 ntx = prng_successor(ntx, 1);
443 if (NTParityChk(&AuthData, ntx)){
444
445 uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
446 uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
447 struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
448 memcpy(mfData, cmd, cmdsize);
449 mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
450
451 crypto1_destroy(pcs);
452 if (CheckCrypto1Parity(cmd, cmdsize, mfData, parity) && CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
453 AuthData.ks2 = ks2;
454 AuthData.ks3 = ks3;
455
456 AuthData.nt = ntx;
457 mfLastKey = GetCrypto1ProbableKey(&AuthData);
458 PrintAndLog(" | * | key | nested probable key:%012"PRIx64" ks2:%08x ks3:%08x | |",
459 mfLastKey,
460 AuthData.ks2,
461 AuthData.ks3);
462
463 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
464 break;
465 }
466 }
467 }
468 }
469
470 //hardnested
471 if (!traceCrypto1) {
472 printf("hardnested not implemented. uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
473 MifareAuthState = masError;
474
475 /* TOO SLOW( needs to have more strong filter. with this filter - aprox 4 mln tests
476 uint32_t t = msclock();
477 uint32_t t1 = t;
478 int n = 0;
479 for (uint32_t i = 0; i < 0xFFFFFFFF; i++) {
480 if (NTParityChk(&AuthData, i)){
481
482 uint32_t ks2 = AuthData.ar_enc ^ prng_successor(i, 64);
483 uint32_t ks3 = AuthData.at_enc ^ prng_successor(i, 96);
484 struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
485
486
487
488
489 n++;
490
491 if (!(n % 100000)) {
492 printf("delta=%d n=%d ks2=%x ks3=%x \n", msclock() - t1 , n, ks2, ks3);
493 t1 = msclock();
494 }
495
496 }
497 }
498 printf("delta=%d n=%d\n", msclock() - t, n);
499 */
500 }
501 }
502
503
504
505 MifareAuthState = masData;
506 }
507
508 if (MifareAuthState == masData && traceCrypto1) {
509 memcpy(mfData, cmd, cmdsize);
510 mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
511 *mfDataLen = cmdsize;
512 }
513
514 return *mfDataLen > 0;
515 }
516
517 bool NTParityChk(TAuthData *ad, uint32_t ntx) {
518 if (
519 (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
520 (oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) ||
521 (oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
522 )
523 return false;
524
525 uint32_t ar = prng_successor(ntx, 64);
526 if (
527 (oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) ||
528 (oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) ||
529 (oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
530 )
531 return false;
532
533 uint32_t at = prng_successor(ntx, 96);
534 if (
535 (oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) ||
536 (oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) ||
537 (oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) ||
538 (oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
539 )
540 return false;
541
542 return true;
543 }
544
545 bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize, uint8_t *parity) {
546 uint8_t buf[32] = {0};
547 struct Crypto1State *pcs;
548
549 AuthData.ks2 = 0;
550 AuthData.ks3 = 0;
551
552 pcs = crypto1_create(key);
553 uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
554 uint32_t ar = prng_successor(nt1, 64);
555 uint32_t at = prng_successor(nt1, 96);
556
557 crypto1_word(pcs, ad->nr_enc, 1);
558 // uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc; // if needs deciphered nr
559 uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
560 uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;
561
562 if (!(ar == ar1 && at == at1 && NTParityChk(ad, nt1)))
563 return false;
564
565 memcpy(buf, cmd, cmdsize);
566 mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
567
568 crypto1_destroy(pcs);
569
570 if (!CheckCrypto1Parity(cmd, cmdsize, buf, parity))
571 return false;
572
573 if(!CheckCrc14443(CRC_14443_A, buf, cmdsize))
574 return false;
575
576 AuthData.nt = nt1;
577 AuthData.ks2 = AuthData.ar_enc ^ ar;
578 AuthData.ks3 = AuthData.at_enc ^ at;
579
580 return true;
581 }
582
583 bool CheckCrypto1Parity(uint8_t *cmd_enc, uint8_t cmdsize, uint8_t *cmd, uint8_t *parity_enc) {
584 for (int i = 0; i < cmdsize - 1; i++) {
585 if (oddparity8(cmd[i]) ^ (cmd[i + 1] & 0x01) ^ ((parity_enc[i / 8] >> (7 - i % 8)) & 0x01) ^ (cmd_enc[i + 1] & 0x01))
586 return false;
587 }
588
589 return true;
590 }
591
592 uint64_t GetCrypto1ProbableKey(TAuthData *ad) {
593 struct Crypto1State *revstate = lfsr_recovery64(ad->ks2, ad->ks3);
594 lfsr_rollback_word(revstate, 0, 0);
595 lfsr_rollback_word(revstate, 0, 0);
596 lfsr_rollback_word(revstate, ad->nr_enc, 1);
597 lfsr_rollback_word(revstate, ad->uid ^ ad->nt, 0);
598
599 uint64_t lfsr = 0;
600 crypto1_get_lfsr(revstate, &lfsr);
601 crypto1_destroy(revstate);
602
603 return lfsr;
604 }
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