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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
7 int main (int argc, char *argv[]) {
8 struct Crypto1State *s,*t;
9 uint64_t key; // recovered key
10 uint32_t uid; // serial number
11 uint32_t nt0; // tag challenge first
12 uint32_t nt1; // tag challenge second
13 uint32_t nr0_enc; // first encrypted reader challenge
14 uint32_t ar0_enc; // first encrypted reader response
15 uint32_t nr1_enc; // second encrypted reader challenge
16 uint32_t ar1_enc; // second encrypted reader response
17 uint32_t ks2; // keystream used to encrypt reader response
18
19 printf("MIFARE Classic key recovery - based 32 bits of keystream VERSION2\n");
20 printf("Recover key from two 32-bit reader authentication answers only\n");
21 printf("This version implements Moebius two different nonce solution (like the supercard)\n\n");
22
23 if (argc < 8) {
24 printf("syntax: %s <uid> <nt> <nr_0> <ar_0> <nt1> <nr_1> <ar_1>\n\n", argv[0]);
25 return 1;
26 }
27
28 sscanf(argv[1],"%x",&uid);
29 sscanf(argv[2],"%x",&nt0);
30 sscanf(argv[3],"%x",&nr0_enc);
31 sscanf(argv[4],"%x",&ar0_enc);
32 sscanf(argv[5],"%x",&nt1);
33 sscanf(argv[6],"%x",&nr1_enc);
34 sscanf(argv[7],"%x",&ar1_enc);
35
36 printf("Recovering key for:\n");
37 printf(" uid: %08x\n",uid);
38 printf(" nt_0: %08x\n",nt0);
39 printf(" {nr_0}: %08x\n",nr0_enc);
40 printf(" {ar_0}: %08x\n",ar0_enc);
41 printf(" nt_1: %08x\n",nt1);
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 uint32_t p64 = prng_successor(nt0, 64);
48 uint32_t p64b = prng_successor(nt1, 64);
49
50 printf(" nt': %08x\n", p64);
51 printf(" nt'': %08x\n", prng_successor(p64, 32));
52
53 // Extract the keystream from the messages
54 printf("\nKeystream used to generate {ar} and {at}:\n");
55 ks2 = ar0_enc ^ p64;
56 printf(" ks2: %08x\n",ks2);
57
58 s = lfsr_recovery32(ar0_enc ^ p64, 0);
59
60 for(t = s; t->odd | t->even; ++t) {
61 lfsr_rollback_word(t, 0, 0);
62 lfsr_rollback_word(t, nr0_enc, 1);
63 lfsr_rollback_word(t, uid ^ nt0, 0);
64 crypto1_get_lfsr(t, &key);
65
66 crypto1_word(t, uid ^ nt1, 0);
67 crypto1_word(t, nr1_enc, 1);
68 if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64b)) {
69 printf("\nFound Key: [%012" PRIx64 "]\n\n",key);
70 break;}
71 }
72 free(s);
73 return 0;
74 }
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