]>
cvs.zerfleddert.de Git - proxmark3-svn/blob - tools/mfkey/mfkey64.c
2 #include "crapto1/crapto1.h"
6 int main (int argc
, char *argv
[]) {
7 struct Crypto1State
*revstate
;
8 uint64_t key
; // recovered key
9 uint32_t uid
; // serial number
10 uint32_t nt
; // tag challenge
11 uint32_t nr_enc
; // encrypted reader challenge
12 uint32_t ar_enc
; // encrypted reader response
13 uint32_t at_enc
; // encrypted tag response
14 uint32_t ks2
; // keystream used to encrypt reader response
15 uint32_t ks3
; // keystream used to encrypt tag response
17 printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
18 printf("Recover key from only one complete authentication!\n\n");
21 printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc] [enc...]\n\n", argv
[0]);
27 uint8_t enc
[encc
][120];
29 sscanf(argv
[1], "%x", &uid
);
30 sscanf(argv
[2], "%x", &nt
);
31 sscanf(argv
[3], "%x", &nr_enc
);
32 sscanf(argv
[4], "%x", &ar_enc
);
33 sscanf(argv
[5], "%x", &at_enc
);
34 for (int i
= 0; i
< encc
; i
++) {
35 enclen
[i
] = strlen(argv
[i
+ 6]) / 2;
36 for (int i2
= 0; i2
< enclen
[i
]; i2
++) {
37 sscanf(argv
[i
+6] + i2
*2,"%2x", (unsigned int *)&enc
[i
][i2
]);
40 printf("Recovering key for:\n");
42 printf(" uid: %08x\n", uid
);
43 printf(" nt: %08x\n", nt
);
44 printf(" {nr}: %08x\n", nr_enc
);
45 printf(" {ar}: %08x\n", ar_enc
);
46 printf(" {at}: %08x\n", at_enc
);
47 for (int i
= 0; i
< encc
; i
++) {
48 printf("{enc%d}: ", i
);
49 for (int i2
= 0; i2
< enclen
[i
]; i2
++) {
50 printf("%02x", enc
[i
][i2
]);
57 uint32_t uid = 0x9c599b32;
58 uint32_t tag_challenge = 0x82a4166c;
59 uint32_t nr_enc = 0xa1e458ce;
60 uint32_t reader_response = 0x6eea41e0;
61 uint32_t tag_response = 0x5cadf439;
63 // Generate lfsr succesors of the tag challenge
64 printf("\nLFSR succesors of the tag challenge:\n");
65 printf(" nt': %08x\n",prng_successor(nt
, 64));
66 printf(" nt'': %08x\n",prng_successor(nt
, 96));
68 // Extract the keystream from the messages
69 printf("\nKeystream used to generate {ar} and {at}:\n");
70 ks2
= ar_enc
^ prng_successor(nt
, 64);
71 ks3
= at_enc
^ prng_successor(nt
, 96);
72 printf(" ks2: %08x\n",ks2
);
73 printf(" ks3: %08x\n",ks3
);
75 revstate
= lfsr_recovery64(ks2
, ks3
);
77 // Decrypting communication using keystream if presented
79 printf("\nDecrypted communication:\n");
82 for (int i
= 0; i
< encc
; i
++) {
83 printf("{dec%d}: ", i
);
84 for (int i2
= 0; i2
< enclen
[i
]; i2
++) {
85 ks4
= crypto1_byte(revstate
, 0, 0);
86 printf("%02x", ks4
^ enc
[i
][i2
]);
91 for (int i
= 0; i
< rollb
; i
++) {
92 lfsr_rollback_byte(revstate
, 0, 0);
96 lfsr_rollback_word(revstate
, 0, 0);
97 lfsr_rollback_word(revstate
, 0, 0);
98 lfsr_rollback_word(revstate
, nr_enc
, 1);
99 lfsr_rollback_word(revstate
, uid
^ nt
, 0);
100 crypto1_get_lfsr(revstate
, &key
);
101 printf("\nFound Key: [%012" PRIx64
"]\n\n",key
);
102 crypto1_destroy(revstate
);