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Fix for swapped parity when using lf_bulk_program.lua (#591)
[proxmark3-svn] / client / cmdhflist.c
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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 "data.h"
20#include "ui.h"
21#include "iso14443crc.h"
22#include "parity.h"
23#include "protocols.h"
24#include "crapto1/crapto1.h"
25#include "mifarehost.h"
26#include "mifaredefault.h"
27
28
29enum MifareAuthSeq {
30 masNone,
31 masNt,
32 masNrAr,
33 masAt,
34 masAuthComplete,
35 masFirstData,
36 masData,
37 masError,
38};
39static enum MifareAuthSeq MifareAuthState;
40static TAuthData AuthData;
41
42void ClearAuthData() {
43 AuthData.uid = 0;
44 AuthData.nt = 0;
45 AuthData.first_auth = true;
46 AuthData.ks2 = 0;
47 AuthData.ks3 = 0;
48}
49
50/**
51 * @brief iso14443A_CRC_check Checks CRC in command or response
52 * @param isResponse
53 * @param data
54 * @param len
55 * @return 0 : CRC-command, CRC not ok
56 * 1 : CRC-command, CRC ok
57 * 2 : Not crc-command
58 */
59uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
60{
61 uint8_t b1,b2;
62
63 if(len <= 2) return 2;
64
65 if(isResponse & (len < 6)) return 2;
66
67 ComputeCrc14443(CRC_14443_A, data, len-2, &b1, &b2);
68 if (b1 != data[len-2] || b2 != data[len-1]) {
69 return 0;
70 } else {
71 return 1;
72 }
73}
74
75uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
76{
77 switch(MifareAuthState) {
78 case masNone:
79 case masError:
80 return iso14443A_CRC_check(isResponse, data, len);
81 default:
82 return 2;
83 }
84}
85
86void annotateIclass(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
87{
88 switch(cmd[0])
89 {
90 case ICLASS_CMD_ACTALL: snprintf(exp,size,"ACTALL"); break;
91 case ICLASS_CMD_READ_OR_IDENTIFY:{
92 if(cmdsize > 1){
93 snprintf(exp,size,"READ(%d)",cmd[1]);
94 }else{
95 snprintf(exp,size,"IDENTIFY");
96 }
97 break;
98 }
99 case ICLASS_CMD_SELECT: snprintf(exp,size,"SELECT"); break;
100 case ICLASS_CMD_PAGESEL: snprintf(exp,size,"PAGESEL(%d)", cmd[1]); break;
101 case ICLASS_CMD_READCHECK_KC:snprintf(exp,size,"READCHECK[Kc](%d)", cmd[1]); break;
102 case ICLASS_CMD_READCHECK_KD:snprintf(exp,size,"READCHECK[Kd](%d)", cmd[1]); break;
103 case ICLASS_CMD_CHECK: snprintf(exp,size,"CHECK"); break;
104 case ICLASS_CMD_DETECT: snprintf(exp,size,"DETECT"); break;
105 case ICLASS_CMD_HALT: snprintf(exp,size,"HALT"); break;
106 case ICLASS_CMD_UPDATE: snprintf(exp,size,"UPDATE(%d)",cmd[1]); break;
107 case ICLASS_CMD_ACT: snprintf(exp,size,"ACT"); break;
108 case ICLASS_CMD_READ4: snprintf(exp,size,"READ4(%d)",cmd[1]); break;
109 default: snprintf(exp,size,"?"); break;
110 }
111 return;
112}
113
114void annotateIso15693(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
115{
116
117 if(cmd[0] == 0x26)
118 {
119 switch(cmd[1]){
120 case ISO15693_INVENTORY :snprintf(exp, size, "INVENTORY");break;
121 case ISO15693_STAYQUIET :snprintf(exp, size, "STAY_QUIET");break;
122 default: snprintf(exp,size,"?"); break;
123
124 }
125 }else if(cmd[0] == 0x02)
126 {
127 switch(cmd[1])
128 {
129 case ISO15693_READBLOCK :snprintf(exp, size, "READBLOCK");break;
130 case ISO15693_WRITEBLOCK :snprintf(exp, size, "WRITEBLOCK");break;
131 case ISO15693_LOCKBLOCK :snprintf(exp, size, "LOCKBLOCK");break;
132 case ISO15693_READ_MULTI_BLOCK :snprintf(exp, size, "READ_MULTI_BLOCK");break;
133 case ISO15693_SELECT :snprintf(exp, size, "SELECT");break;
134 case ISO15693_RESET_TO_READY :snprintf(exp, size, "RESET_TO_READY");break;
135 case ISO15693_WRITE_AFI :snprintf(exp, size, "WRITE_AFI");break;
136 case ISO15693_LOCK_AFI :snprintf(exp, size, "LOCK_AFI");break;
137 case ISO15693_WRITE_DSFID :snprintf(exp, size, "WRITE_DSFID");break;
138 case ISO15693_LOCK_DSFID :snprintf(exp, size, "LOCK_DSFID");break;
139 case ISO15693_GET_SYSTEM_INFO :snprintf(exp, size, "GET_SYSTEM_INFO");break;
140 case ISO15693_READ_MULTI_SECSTATUS :snprintf(exp, size, "READ_MULTI_SECSTATUS");break;
141 default: snprintf(exp,size,"?"); break;
142 }
143 }
144}
145
146
147void annotateTopaz(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
148{
149 switch(cmd[0]) {
150 case TOPAZ_REQA :snprintf(exp, size, "REQA");break;
151 case TOPAZ_WUPA :snprintf(exp, size, "WUPA");break;
152 case TOPAZ_RID :snprintf(exp, size, "RID");break;
153 case TOPAZ_RALL :snprintf(exp, size, "RALL");break;
154 case TOPAZ_READ :snprintf(exp, size, "READ");break;
155 case TOPAZ_WRITE_E :snprintf(exp, size, "WRITE-E");break;
156 case TOPAZ_WRITE_NE :snprintf(exp, size, "WRITE-NE");break;
157 case TOPAZ_RSEG :snprintf(exp, size, "RSEG");break;
158 case TOPAZ_READ8 :snprintf(exp, size, "READ8");break;
159 case TOPAZ_WRITE_E8 :snprintf(exp, size, "WRITE-E8");break;
160 case TOPAZ_WRITE_NE8 :snprintf(exp, size, "WRITE-NE8");break;
161 default: snprintf(exp,size,"?"); break;
162 }
163}
164
165
166/**
16706 00 = INITIATE
1680E xx = SELECT ID (xx = Chip-ID)
1690B = Get UID
17008 yy = Read Block (yy = block number)
17109 yy dd dd dd dd = Write Block (yy = block number; dd dd dd dd = data to be written)
1720C = Reset to Inventory
1730F = Completion
1740A 11 22 33 44 55 66 = Authenticate (11 22 33 44 55 66 = data to authenticate)
175**/
176
177void annotateIso14443b(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
178{
179 switch(cmd[0]){
180 case ISO14443B_REQB : snprintf(exp,size,"REQB");break;
181 case ISO14443B_ATTRIB : snprintf(exp,size,"ATTRIB");break;
182 case ISO14443B_HALT : snprintf(exp,size,"HALT");break;
183 case ISO14443B_INITIATE : snprintf(exp,size,"INITIATE");break;
184 case ISO14443B_SELECT : snprintf(exp,size,"SELECT(%d)",cmd[1]);break;
185 case ISO14443B_GET_UID : snprintf(exp,size,"GET UID");break;
186 case ISO14443B_READ_BLK : snprintf(exp,size,"READ_BLK(%d)", cmd[1]);break;
187 case ISO14443B_WRITE_BLK : snprintf(exp,size,"WRITE_BLK(%d)",cmd[1]);break;
188 case ISO14443B_RESET : snprintf(exp,size,"RESET");break;
189 case ISO14443B_COMPLETION : snprintf(exp,size,"COMPLETION");break;
190 case ISO14443B_AUTHENTICATE : snprintf(exp,size,"AUTHENTICATE");break;
191 default : snprintf(exp,size ,"?");break;
192 }
193
194}
195
196void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
197{
198 switch(cmd[0])
199 {
200 case ISO14443A_CMD_WUPA:
201 snprintf(exp,size,"WUPA");
202 break;
203 case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
204 // 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
205 // 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
206 if(cmd[1] == 0x70)
207 {
208 snprintf(exp,size,"SELECT_UID"); break;
209 }else
210 {
211 snprintf(exp,size,"ANTICOLL"); break;
212 }
213 }
214 case ISO14443A_CMD_ANTICOLL_OR_SELECT_2:{
215 //95 20 = Anticollision of cascade level2
216 //95 70 = Select of cascade level2
217 if(cmd[2] == 0x70)
218 {
219 snprintf(exp,size,"SELECT_UID-2"); break;
220 }else
221 {
222 snprintf(exp,size,"ANTICOLL-2"); break;
223 }
224 }
225 case ISO14443A_CMD_REQA:
226 snprintf(exp,size,"REQA");
227 break;
228 case ISO14443A_CMD_READBLOCK: snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
229 case ISO14443A_CMD_WRITEBLOCK: snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
230 case ISO14443A_CMD_HALT:
231 snprintf(exp,size,"HALT");
232 MifareAuthState = masNone;
233 break;
234 case ISO14443A_CMD_RATS: snprintf(exp,size,"RATS"); break;
235 case MIFARE_CMD_INC: snprintf(exp,size,"INC(%d)",cmd[1]); break;
236 case MIFARE_CMD_DEC: snprintf(exp,size,"DEC(%d)",cmd[1]); break;
237 case MIFARE_CMD_RESTORE: snprintf(exp,size,"RESTORE(%d)",cmd[1]); break;
238 case MIFARE_CMD_TRANSFER: snprintf(exp,size,"TRANSFER(%d)",cmd[1]); break;
239 case MIFARE_AUTH_KEYA:
240 if ( cmdsize > 3) {
241 snprintf(exp,size,"AUTH-A(%d)",cmd[1]);
242 MifareAuthState = masNt;
243 } else {
244 // case MIFARE_ULEV1_VERSION : both 0x60.
245 snprintf(exp,size,"EV1 VERSION");
246 }
247 break;
248 case MIFARE_AUTH_KEYB:
249 MifareAuthState = masNt;
250 snprintf(exp,size,"AUTH-B(%d)",cmd[1]);
251 break;
252 case MIFARE_MAGICWUPC1: snprintf(exp,size,"MAGIC WUPC1"); break;
253 case MIFARE_MAGICWUPC2: snprintf(exp,size,"MAGIC WUPC2"); break;
254 case MIFARE_MAGICWIPEC: snprintf(exp,size,"MAGIC WIPEC"); break;
255 case MIFARE_ULC_AUTH_1: snprintf(exp,size,"AUTH "); break;
256 case MIFARE_ULC_AUTH_2: snprintf(exp,size,"AUTH_ANSW"); break;
257 case MIFARE_ULEV1_AUTH:
258 if ( cmdsize == 7 )
259 snprintf(exp,size,"PWD-AUTH KEY: 0x%02x%02x%02x%02x", cmd[1], cmd[2], cmd[3], cmd[4] );
260 else
261 snprintf(exp,size,"PWD-AUTH");
262 break;
263 case MIFARE_ULEV1_FASTREAD:{
264 if ( cmdsize >=3 && cmd[2] <= 0xE6)
265 snprintf(exp,size,"READ RANGE (%d-%d)",cmd[1],cmd[2]);
266 else
267 snprintf(exp,size,"?");
268 break;
269 }
270 case MIFARE_ULC_WRITE:{
271 if ( cmd[1] < 0x21 )
272 snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]);
273 else
274 snprintf(exp,size,"?");
275 break;
276 }
277 case MIFARE_ULEV1_READ_CNT:{
278 if ( cmd[1] < 5 )
279 snprintf(exp,size,"READ CNT(%d)",cmd[1]);
280 else
281 snprintf(exp,size,"?");
282 break;
283 }
284 case MIFARE_ULEV1_INCR_CNT:{
285 if ( cmd[1] < 5 )
286 snprintf(exp,size,"INCR(%d)",cmd[1]);
287 else
288 snprintf(exp,size,"?");
289 break;
290 }
291 case MIFARE_ULEV1_READSIG: snprintf(exp,size,"READ_SIG"); break;
292 case MIFARE_ULEV1_CHECKTEAR: snprintf(exp,size,"CHK_TEARING(%d)",cmd[1]); break;
293 case MIFARE_ULEV1_VCSL: snprintf(exp,size,"VCSL"); break;
294 default: snprintf(exp,size,"?"); break;
295 }
296 return;
297}
298
299void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
300 if (!isResponse && cmdsize == 1) {
301 switch(cmd[0]) {
302 case ISO14443A_CMD_WUPA:
303 case ISO14443A_CMD_REQA:
304 MifareAuthState = masNone;
305 break;
306 default:
307 break;
308 }
309 }
310
311 // get UID
312 if (MifareAuthState == masNone) {
313 if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
314 ClearAuthData();
315 AuthData.uid = bytes_to_num(&cmd[2], 4);
316 }
317 if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
318 ClearAuthData();
319 AuthData.uid = bytes_to_num(&cmd[2], 4);
320 }
321 }
322
323 switch(MifareAuthState) {
324 case masNt:
325 if (cmdsize == 4 && isResponse) {
326 snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
327 MifareAuthState = masNrAr;
328 if (AuthData.first_auth) {
329 AuthData.nt = bytes_to_num(cmd, 4);
330 } else {
331 AuthData.nt_enc = bytes_to_num(cmd, 4);
332 AuthData.nt_enc_par = parity[0];
333 }
334 return;
335 } else {
336 MifareAuthState = masError;
337 }
338 break;
339 case masNrAr:
340 if (cmdsize == 8 && !isResponse) {
341 snprintf(exp,size,"AUTH: nr ar (enc)");
342 MifareAuthState = masAt;
343 AuthData.nr_enc = bytes_to_num(cmd, 4);
344 AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
345 AuthData.ar_enc_par = parity[0] << 4;
346 return;
347 } else {
348 MifareAuthState = masError;
349 }
350 break;
351 case masAt:
352 if (cmdsize == 4 && isResponse) {
353 snprintf(exp,size,"AUTH: at (enc)");
354 MifareAuthState = masAuthComplete;
355 AuthData.at_enc = bytes_to_num(cmd, 4);
356 AuthData.at_enc_par = parity[0];
357 return;
358 } else {
359 MifareAuthState = masError;
360 }
361 break;
362 default:
363 break;
364 }
365
366 if (!isResponse && ((MifareAuthState == masNone) || (MifareAuthState == masError)))
367 annotateIso14443a(exp, size, cmd, cmdsize);
368
369}
370
371bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, uint8_t *parity, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
372 static struct Crypto1State *traceCrypto1;
373 static uint64_t mfLastKey;
374
375 *mfDataLen = 0;
376
377 if (MifareAuthState == masAuthComplete) {
378 if (traceCrypto1) {
379 crypto1_destroy(traceCrypto1);
380 traceCrypto1 = NULL;
381 }
382
383 MifareAuthState = masFirstData;
384 return false;
385 }
386
387 if (cmdsize > 32)
388 return false;
389
390 if (MifareAuthState == masFirstData) {
391 if (AuthData.first_auth) {
392 AuthData.ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
393 AuthData.ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
394
395 mfLastKey = GetCrypto1ProbableKey(&AuthData);
396 PrintAndLog(" | * | key | probable key:%012"PRIx64" Prng:%s ks2:%08x ks3:%08x | |",
397 mfLastKey,
398 validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
399 AuthData.ks2,
400 AuthData.ks3);
401
402 AuthData.first_auth = false;
403
404 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
405 } else {
406 if (traceCrypto1) {
407 crypto1_destroy(traceCrypto1);
408 traceCrypto1 = NULL;
409 }
410
411 // check last used key
412 if (mfLastKey) {
413 if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize, parity)) {
414 PrintAndLog(" | * | key | last used key:%012"PRIx64" ks2:%08x ks3:%08x | |",
415 mfLastKey,
416 AuthData.ks2,
417 AuthData.ks3);
418
419 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
420 };
421 }
422
423 // check default keys
424 if (!traceCrypto1) {
425 for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
426 if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize, parity)) {
427 PrintAndLog(" | * | key | default key:%012"PRIx64" ks2:%08x ks3:%08x | |",
428 MifareDefaultKeys[defaultKeyCounter],
429 AuthData.ks2,
430 AuthData.ks3);
431
432 mfLastKey = MifareDefaultKeys[defaultKeyCounter];
433 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
434 break;
435 };
436 }
437 }
438
439 // nested
440 if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
441 uint32_t ntx = prng_successor(AuthData.nt, 90);
442 for (int i = 0; i < 16383; i++) {
443 ntx = prng_successor(ntx, 1);
444 if (NTParityChk(&AuthData, ntx)){
445
446 uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
447 uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
448 struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
449 memcpy(mfData, cmd, cmdsize);
450 mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
451
452 crypto1_destroy(pcs);
453 if (CheckCrypto1Parity(cmd, cmdsize, mfData, parity) && CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
454 AuthData.ks2 = ks2;
455 AuthData.ks3 = ks3;
456
457 AuthData.nt = ntx;
458 mfLastKey = GetCrypto1ProbableKey(&AuthData);
459 PrintAndLog(" | * | key | nested probable key:%012"PRIx64" ks2:%08x ks3:%08x | |",
460 mfLastKey,
461 AuthData.ks2,
462 AuthData.ks3);
463
464 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
465 break;
466 }
467 }
468 }
469 }
470
471 //hardnested
472 if (!traceCrypto1) {
473 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);
474 MifareAuthState = masError;
475
476 /* TOO SLOW( needs to have more strong filter. with this filter - aprox 4 mln tests
477 uint32_t t = msclock();
478 uint32_t t1 = t;
479 int n = 0;
480 for (uint32_t i = 0; i < 0xFFFFFFFF; i++) {
481 if (NTParityChk(&AuthData, i)){
482
483 uint32_t ks2 = AuthData.ar_enc ^ prng_successor(i, 64);
484 uint32_t ks3 = AuthData.at_enc ^ prng_successor(i, 96);
485 struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
486
487
488
489
490 n++;
491
492 if (!(n % 100000)) {
493 printf("delta=%d n=%d ks2=%x ks3=%x \n", msclock() - t1 , n, ks2, ks3);
494 t1 = msclock();
495 }
496
497 }
498 }
499 printf("delta=%d n=%d\n", msclock() - t, n);
500 */
501 }
502 }
503
504
505
506 MifareAuthState = masData;
507 }
508
509 if (MifareAuthState == masData && traceCrypto1) {
510 memcpy(mfData, cmd, cmdsize);
511 mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
512 *mfDataLen = cmdsize;
513 }
514
515 return *mfDataLen > 0;
516}
517
518bool NTParityChk(TAuthData *ad, uint32_t ntx) {
519 if (
520 (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
521 (oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) ||
522 (oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
523 )
524 return false;
525
526 uint32_t ar = prng_successor(ntx, 64);
527 if (
528 (oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) ||
529 (oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) ||
530 (oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
531 )
532 return false;
533
534 uint32_t at = prng_successor(ntx, 96);
535 if (
536 (oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) ||
537 (oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) ||
538 (oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) ||
539 (oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
540 )
541 return false;
542
543 return true;
544}
545
546bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize, uint8_t *parity) {
547 uint8_t buf[32] = {0};
548 struct Crypto1State *pcs;
549
550 AuthData.ks2 = 0;
551 AuthData.ks3 = 0;
552
553 pcs = crypto1_create(key);
554 uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
555 uint32_t ar = prng_successor(nt1, 64);
556 uint32_t at = prng_successor(nt1, 96);
557
558 crypto1_word(pcs, ad->nr_enc, 1);
559// uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc; // if needs deciphered nr
560 uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
561 uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;
562
563 if (!(ar == ar1 && at == at1 && NTParityChk(ad, nt1)))
564 return false;
565
566 memcpy(buf, cmd, cmdsize);
567 mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
568
569 crypto1_destroy(pcs);
570
571 if (!CheckCrypto1Parity(cmd, cmdsize, buf, parity))
572 return false;
573
574 if(!CheckCrc14443(CRC_14443_A, buf, cmdsize))
575 return false;
576
577 AuthData.nt = nt1;
578 AuthData.ks2 = AuthData.ar_enc ^ ar;
579 AuthData.ks3 = AuthData.at_enc ^ at;
580
581 return true;
582}
583
584bool CheckCrypto1Parity(uint8_t *cmd_enc, uint8_t cmdsize, uint8_t *cmd, uint8_t *parity_enc) {
585 for (int i = 0; i < cmdsize - 1; i++) {
586 if (oddparity8(cmd[i]) ^ (cmd[i + 1] & 0x01) ^ ((parity_enc[i / 8] >> (7 - i % 8)) & 0x01) ^ (cmd_enc[i + 1] & 0x01))
587 return false;
588 }
589
590 return true;
591}
592
593uint64_t GetCrypto1ProbableKey(TAuthData *ad) {
594 struct Crypto1State *revstate = lfsr_recovery64(ad->ks2, ad->ks3);
595 lfsr_rollback_word(revstate, 0, 0);
596 lfsr_rollback_word(revstate, 0, 0);
597 lfsr_rollback_word(revstate, ad->nr_enc, 1);
598 lfsr_rollback_word(revstate, ad->uid ^ ad->nt, 0);
599
600 uint64_t lfsr = 0;
601 crypto1_get_lfsr(revstate, &lfsr);
602 crypto1_destroy(revstate);
603
604 return lfsr;
605}
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