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1 | #define __STDC_FORMAT_MACROS |
2 | #include <inttypes.h> |
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3 | #include "crapto1.h" |
4 | #include <stdio.h> |
5 | #include <stdlib.h> |
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6 | #include <time.h> |
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7 | |
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8 | #define llx PRIx64 |
9 | #define lli PRIi64 |
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10 | int main (int argc, char *argv[]) { |
11 | struct Crypto1State *s,*t; |
12 | uint64_t key; // recovered key |
13 | uint32_t uid; // serial number |
14 | uint32_t nt0; // tag challenge first |
15 | uint32_t nt1; // tag challenge second |
16 | uint32_t nr0_enc; // first encrypted reader challenge |
17 | uint32_t ar0_enc; // first encrypted reader response |
18 | uint32_t nr1_enc; // second encrypted reader challenge |
19 | uint32_t ar1_enc; // second encrypted reader response |
20 | uint32_t ks2; // keystream used to encrypt reader response |
21 | |
22 | printf("MIFARE Classic key recovery - based 32 bits of keystream VERSION2\n"); |
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23 | printf("Recover key from two 32-bit reader authentication answers only\n"); |
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24 | printf("This version implements Moebius two different nonce solution (like the supercard)\n\n"); |
25 | |
26 | if (argc < 8) { |
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27 | printf("syntax: %s <uid> <nt> <nr_0> <ar_0> <nt1> <nr_1> <ar_1>\n\n", argv[0]); |
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28 | return 1; |
29 | } |
30 | |
31 | sscanf(argv[1],"%x",&uid); |
32 | sscanf(argv[2],"%x",&nt0); |
33 | sscanf(argv[3],"%x",&nr0_enc); |
34 | sscanf(argv[4],"%x",&ar0_enc); |
35 | sscanf(argv[5],"%x",&nt1); |
36 | sscanf(argv[6],"%x",&nr1_enc); |
37 | sscanf(argv[7],"%x",&ar1_enc); |
38 | |
39 | printf("Recovering key for:\n"); |
40 | printf(" uid: %08x\n",uid); |
41 | printf(" nt_0: %08x\n",nt0); |
42 | printf(" {nr_0}: %08x\n",nr0_enc); |
43 | printf(" {ar_0}: %08x\n",ar0_enc); |
44 | printf(" nt_1: %08x\n",nt1); |
45 | printf(" {nr_1}: %08x\n",nr1_enc); |
46 | printf(" {ar_1}: %08x\n",ar1_enc); |
47 | |
48 | // Generate lfsr succesors of the tag challenge |
49 | printf("\nLFSR succesors of the tag challenge:\n"); |
50 | printf(" nt': %08x\n",prng_successor(nt0, 64)); |
51 | printf(" nt'': %08x\n",prng_successor(nt0, 96)); |
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52 | clock_t t1 = clock(); |
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53 | |
54 | // Extract the keystream from the messages |
55 | printf("\nKeystream used to generate {ar} and {at}:\n"); |
56 | ks2 = ar0_enc ^ prng_successor(nt0, 64); |
57 | printf(" ks2: %08x\n",ks2); |
58 | |
59 | s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0); |
60 | |
61 | for(t = s; t->odd | t->even; ++t) { |
62 | lfsr_rollback_word(t, 0, 0); |
63 | lfsr_rollback_word(t, nr0_enc, 1); |
64 | lfsr_rollback_word(t, uid ^ nt0, 0); |
65 | crypto1_get_lfsr(t, &key); |
66 | |
67 | crypto1_word(t, uid ^ nt1, 0); |
68 | crypto1_word(t, nr1_enc, 1); |
69 | if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) { |
70 | printf("\nFound Key: [%012"llx"]\n\n",key); |
71 | break;} |
72 | } |
73 | free(s); |
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74 | t1 = clock() - t1; |
75 | if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1 ); |
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76 | return 0; |
77 | } |