]> git.zerfleddert.de Git - proxmark3-svn/blame - tools/mfkey/mfkey32.c
Remove duplicate #include stdio.h
[proxmark3-svn] / tools / mfkey / mfkey32.c
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cda056bb 1#include <inttypes.h>
4cb4b588 2#include <stdbool.h>
cda056bb 3#include <stdio.h>
4#include <stdlib.h>
4cb4b588 5#include "crapto1/crapto1.h"
6#include "mfkey.h"
7#include "util.h"
cda056bb 8
4cb4b588 9// 32 bit recover key from 2 nonces
cda056bb 10int main (int argc, char *argv[]) {
4cb4b588 11
12 nonces_t data;
cda056bb 13 uint32_t ks2; // keystream used to encrypt reader response
4cb4b588 14 uint64_t key; // recovered key
cda056bb 15
4cb4b588 16 printf("MIFARE Classic key recovery - based on 32 bits of keystream\n");
cda056bb 17 printf("Recover key from two 32-bit reader authentication answers only!\n\n");
18
4cb4b588 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");
cda056bb 22 return 1;
23 }
24
4cb4b588 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 }
cda056bb 40
41 printf("Recovering key for:\n");
4cb4b588 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);
cda056bb 49
4cb4b588 50 uint64_t start_time = msclock();
51
cda056bb 52 // Generate lfsr succesors of the tag challenge
53 printf("\nLFSR succesors of the tag challenge:\n");
4cb4b588 54 printf(" nt': %08x\n",prng_successor(data.nonce, 64));
55 printf(" nt'': %08x\n",prng_successor(data.nonce, 96));
cda056bb 56
57 // Extract the keystream from the messages
58 printf("\nKeystream used to generate {ar} and {at}:\n");
4cb4b588 59 ks2 = data.ar ^ prng_successor(data.nonce, 64);
cda056bb 60 printf(" ks2: %08x\n",ks2);
61
4cb4b588 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");
cda056bb 73 }
cda056bb 74
4cb4b588 75 printf("Time spent: %1.2f seconds\n", (float)(msclock() - start_time)/1000.0);
cda056bb 76}
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