]> git.zerfleddert.de Git - proxmark3-svn/blame - tools/mfkey/mfkey32.c
Merge branch 'master' into fix_iclass_sim
[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"
fdd9395d 6#include "mifare/mfkey.h"
ec9c7112 7#include "util_posix.h"
8
cda056bb 9
4cb4b588 10// 32 bit recover key from 2 nonces
cda056bb 11int main (int argc, char *argv[]) {
4cb4b588 12
44964fd1 13 nonces_t data = {0};
cda056bb 14 uint32_t ks2; // keystream used to encrypt reader response
4cb4b588 15 uint64_t key; // recovered key
cda056bb 16
4cb4b588 17 printf("MIFARE Classic key recovery - based on 32 bits of keystream\n");
cda056bb 18 printf("Recover key from two 32-bit reader authentication answers only!\n\n");
19
4cb4b588 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");
cda056bb 23 return 1;
24 }
25
4cb4b588 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 }
cda056bb 41
42 printf("Recovering key for:\n");
4cb4b588 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);
cda056bb 50
4cb4b588 51 uint64_t start_time = msclock();
52
cda056bb 53 // Generate lfsr succesors of the tag challenge
54 printf("\nLFSR succesors of the tag challenge:\n");
4cb4b588 55 printf(" nt': %08x\n",prng_successor(data.nonce, 64));
56 printf(" nt'': %08x\n",prng_successor(data.nonce, 96));
cda056bb 57
58 // Extract the keystream from the messages
59 printf("\nKeystream used to generate {ar} and {at}:\n");
4cb4b588 60 ks2 = data.ar ^ prng_successor(data.nonce, 64);
cda056bb 61 printf(" ks2: %08x\n",ks2);
62
4cb4b588 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");
cda056bb 74 }
cda056bb 75
4cb4b588 76 printf("Time spent: %1.2f seconds\n", (float)(msclock() - start_time)/1000.0);
cda056bb 77}
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