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[proxmark3-svn] / tools / mfkey / mfkey32v2.c
1 #define __STDC_FORMAT_MACROS
2 #include <inttypes.h>
3 #include "crapto1.h"
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <time.h>
7
8 #define llx PRIx64
9 #define lli PRIi64
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");
23 printf("Recover key from two 32-bit reader authentication answers only\n");
24 printf("This version implements Moebius two different nonce solution (like the supercard)\n\n");
25
26 if (argc < 8) {
27 printf("syntax: %s <uid> <nt> <nr_0> <ar_0> <nt1> <nr_1> <ar_1>\n\n", argv[0]);
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 uint32_t p64 = prng_successor(nt0, 64);
51 uint32_t p64b = prng_successor(nt1, 64);
52
53 printf(" nt': %08x\n", p64);
54 printf(" nt'': %08x\n", prng_successor(p64, 32));
55 clock_t t1 = clock();
56
57 // Extract the keystream from the messages
58 printf("\nKeystream used to generate {ar} and {at}:\n");
59 ks2 = ar0_enc ^ p64;
60 printf(" ks2: %08x\n",ks2);
61
62 s = lfsr_recovery32(ar0_enc ^ p64, 0);
63
64
65 for(t = s; t->odd | t->even; ++t) {
66 lfsr_rollback_word(t, 0, 0);
67 lfsr_rollback_word(t, nr0_enc, 1);
68 lfsr_rollback_word(t, uid ^ nt0, 0);
69 crypto1_get_lfsr(t, &key);
70
71 crypto1_word(t, uid ^ nt1, 0);
72 crypto1_word(t, nr1_enc, 1);
73 if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64b)) {
74 printf("\nFound Key: [%012"llx"]\n\n",key);
75 break;}
76 }
77 free(s);
78 t1 = clock() - t1;
79 if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1 );
80 return 0;
81 }
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