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[proxmark3-svn] / tools / mfkey / mfkey32.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 nt; // tag challenge
12 uint32_t nr0_enc; // first encrypted reader challenge
13 uint32_t ar0_enc; // first encrypted reader response
14 uint32_t nr1_enc; // second encrypted reader challenge
15 uint32_t ar1_enc; // second encrypted reader response
16 uint32_t ks2; // keystream used to encrypt reader response
17
18 printf("MIFARE Classic key recovery - based 32 bits of keystream\n");
19 printf("Recover key from two 32-bit reader authentication answers only!\n\n");
20
21 if (argc < 7) {
22 printf(" syntax: %s <uid> <nt> <nr_0> <ar_0> <nr_1> <ar_1>\n\n",argv[0]);
23 return 1;
24 }
25
26 sscanf(argv[1],"%x",&uid);
27 sscanf(argv[2],"%x",&nt);
28 sscanf(argv[3],"%x",&nr0_enc);
29 sscanf(argv[4],"%x",&ar0_enc);
30 sscanf(argv[5],"%x",&nr1_enc);
31 sscanf(argv[6],"%x",&ar1_enc);
32
33 printf("Recovering key for:\n");
34 printf(" uid: %08x\n",uid);
35 printf(" nt: %08x\n",nt);
36 printf(" {nr_0}: %08x\n",nr0_enc);
37 printf(" {ar_0}: %08x\n",ar0_enc);
38 printf(" {nr_1}: %08x\n",nr1_enc);
39 printf(" {ar_1}: %08x\n",ar1_enc);
40
41 // Generate lfsr succesors of the tag challenge
42 printf("\nLFSR succesors of the tag challenge:\n");
43 uint32_t p64 = prng_successor(nt, 64);
44 printf(" nt': %08x\n", p64);
45 printf(" nt'': %08x\n", prng_successor(p64, 32));
46
47 // Extract the keystream from the messages
48 printf("\nKeystream used to generate {ar} and {at}:\n");
49 ks2 = ar0_enc ^ p64;
50 printf(" ks2: %08x\n", ks2);
51
52 s = lfsr_recovery32(ar0_enc ^ p64, 0);
53
54 for(t = s; t->odd | t->even; ++t) {
55 lfsr_rollback_word(t, 0, 0);
56 lfsr_rollback_word(t, nr0_enc, 1);
57 lfsr_rollback_word(t, uid ^ nt, 0);
58 crypto1_get_lfsr(t, &key);
59 crypto1_word(t, uid ^ nt, 0);
60 crypto1_word(t, nr1_enc, 1);
61 if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64)) {
62 printf("\nFound Key: [%012" PRIx64 "]\n\n",key);
63 break;}
64 }
65 free(s);
66 return 0;
67 }
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