]> git.zerfleddert.de Git - proxmark3-svn/blame - tools/mfkey/mfkey32v2.c
chg: @piwi's code cleanup and some more.
[proxmark3-svn] / tools / mfkey / mfkey32v2.c
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db25599d 1#define __STDC_FORMAT_MACROS
2#include <inttypes.h>
db25599d 3#include "crapto1.h"
4#include <stdio.h>
5#include <stdlib.h>
838c15a6 6#include <time.h>
9c624f67 7
db25599d 8int main (int argc, char *argv[]) {
9 struct Crypto1State *s,*t;
10 uint64_t key; // recovered key
11 uint32_t uid; // serial number
12 uint32_t nt0; // tag challenge first
13 uint32_t nt1; // tag challenge second
14 uint32_t nr0_enc; // first encrypted reader challenge
15 uint32_t ar0_enc; // first encrypted reader response
16 uint32_t nr1_enc; // second encrypted reader challenge
17 uint32_t ar1_enc; // second encrypted reader response
18 uint32_t ks2; // keystream used to encrypt reader response
19
20 printf("MIFARE Classic key recovery - based 32 bits of keystream VERSION2\n");
838c15a6 21 printf("Recover key from two 32-bit reader authentication answers only\n");
db25599d 22 printf("This version implements Moebius two different nonce solution (like the supercard)\n\n");
23
24 if (argc < 8) {
838c15a6 25 printf("syntax: %s <uid> <nt> <nr_0> <ar_0> <nt1> <nr_1> <ar_1>\n\n", argv[0]);
db25599d 26 return 1;
27 }
28
29 sscanf(argv[1],"%x",&uid);
30 sscanf(argv[2],"%x",&nt0);
31 sscanf(argv[3],"%x",&nr0_enc);
32 sscanf(argv[4],"%x",&ar0_enc);
33 sscanf(argv[5],"%x",&nt1);
34 sscanf(argv[6],"%x",&nr1_enc);
35 sscanf(argv[7],"%x",&ar1_enc);
36
37 printf("Recovering key for:\n");
38 printf(" uid: %08x\n",uid);
39 printf(" nt_0: %08x\n",nt0);
40 printf(" {nr_0}: %08x\n",nr0_enc);
41 printf(" {ar_0}: %08x\n",ar0_enc);
42 printf(" nt_1: %08x\n",nt1);
43 printf(" {nr_1}: %08x\n",nr1_enc);
44 printf(" {ar_1}: %08x\n",ar1_enc);
45
46 // Generate lfsr succesors of the tag challenge
47 printf("\nLFSR succesors of the tag challenge:\n");
a1ab594e 48 uint32_t p64 = prng_successor(nt0, 64);
49 uint32_t p64b = prng_successor(nt1, 64);
50
51 printf(" nt': %08x\n", p64);
52 printf(" nt'': %08x\n", prng_successor(p64, 32));
838c15a6 53 clock_t t1 = clock();
db25599d 54
55 // Extract the keystream from the messages
56 printf("\nKeystream used to generate {ar} and {at}:\n");
a1ab594e 57 ks2 = ar0_enc ^ p64;
db25599d 58 printf(" ks2: %08x\n",ks2);
59
a1ab594e 60 s = lfsr_recovery32(ar0_enc ^ p64, 0);
61
db25599d 62
63 for(t = s; t->odd | t->even; ++t) {
64 lfsr_rollback_word(t, 0, 0);
65 lfsr_rollback_word(t, nr0_enc, 1);
66 lfsr_rollback_word(t, uid ^ nt0, 0);
67 crypto1_get_lfsr(t, &key);
68
69 crypto1_word(t, uid ^ nt1, 0);
70 crypto1_word(t, nr1_enc, 1);
a1ab594e 71 if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64b)) {
9c624f67 72 printf("\nFound Key: [%012" PRIx64 "]\n\n",key);
db25599d 73 break;}
74 }
75 free(s);
838c15a6 76 t1 = clock() - t1;
77 if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1 );
db25599d 78 return 0;
79}
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