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Remove duplicate #include stdio.h
[proxmark3-svn] / tools / mfkey / mfkey32.c
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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 "mfkey.h"
7#include "util.h"
8
9// 32 bit recover key from 2 nonces
10int main (int argc, char *argv[]) {
11
12 nonces_t data;
13 uint32_t ks2; // keystream used to encrypt reader response
14 uint64_t key; // recovered key
15
16 printf("MIFARE Classic key recovery - based on 32 bits of keystream\n");
17 printf("Recover key from two 32-bit reader authentication answers only!\n\n");
18
19 if (argc != 7 && argc != 8) {
20 printf(" syntax: %s <uid> <nt0> <{nr_0}> <{ar_0}> [<nt1>] <{nr_1}> <{ar_1}>\n", argv[0]);
21 printf(" (you may omit nt1 if it is equal to nt0)\n\n");
22 return 1;
23 }
24
25 bool moebius_attack = (argc == 8);
26
27 sscanf(argv[1],"%x",&data.cuid);
28 sscanf(argv[2],"%x",&data.nonce);
29 data.nonce2 = data.nonce;
30 sscanf(argv[3],"%x",&data.nr);
31 sscanf(argv[4],"%x",&data.ar);
32 if (moebius_attack) {
33 sscanf(argv[5],"%x",&data.nonce2);
34 sscanf(argv[6],"%x",&data.nr2);
35 sscanf(argv[7],"%x",&data.ar2);
36 } else {
37 sscanf(argv[5],"%x",&data.nr2);
38 sscanf(argv[6],"%x",&data.ar2);
39 }
40
41 printf("Recovering key for:\n");
42 printf(" uid: %08x\n",data.cuid);
43 printf(" nt0: %08x\n",data.nonce);
44 printf(" {nr_0}: %08x\n",data.nr);
45 printf(" {ar_0}: %08x\n",data.ar);
46 printf(" nt1: %08x\n",data.nonce2);
47 printf(" {nr_1}: %08x\n",data.nr2);
48 printf(" {ar_1}: %08x\n",data.ar2);
49
50 uint64_t start_time = msclock();
51
52 // Generate lfsr succesors of the tag challenge
53 printf("\nLFSR succesors of the tag challenge:\n");
54 printf(" nt': %08x\n",prng_successor(data.nonce, 64));
55 printf(" nt'': %08x\n",prng_successor(data.nonce, 96));
56
57 // Extract the keystream from the messages
58 printf("\nKeystream used to generate {ar} and {at}:\n");
59 ks2 = data.ar ^ prng_successor(data.nonce, 64);
60 printf(" ks2: %08x\n",ks2);
61
62 bool success;
63 if (moebius_attack) {
64 success = mfkey32_moebius(data, &key);
65 } else {
66 success = mfkey32(data, &key);
67 }
68
69 if (success) {
70 printf("Recovered key: %012" PRIx64 "\n", key);
71 } else {
72 printf("Couldn't recover key.\n");
73 }
74
75 printf("Time spent: %1.2f seconds\n", (float)(msclock() - start_time)/1000.0);
76}
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