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7779d73c 1//-----------------------------------------------------------------------------
2// Merlok - June 2011
3// Roel - Dec 2009
4// Unknown author
5//
6// This code is licensed to you under the terms of the GNU GPL, version 2 or,
7// at your option, any later version. See the LICENSE.txt file for the text of
8// the license.
9//-----------------------------------------------------------------------------
10// MIFARE Darkside hack
11//-----------------------------------------------------------------------------
12
4cb4b588 13#include "mfkey.h"
7779d73c 14
7779d73c 15#include "crapto1/crapto1.h"
16
4cb4b588 17
7779d73c 18// recover key from 2 different reader responses on same tag challenge
19bool mfkey32(nonces_t data, uint64_t *outputkey) {
20 struct Crypto1State *s,*t;
21 uint64_t outkey = 0;
22 uint64_t key = 0; // recovered key
23 bool isSuccess = false;
24 uint8_t counter = 0;
25
7779d73c 26 s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
27
28 for(t = s; t->odd | t->even; ++t) {
29 lfsr_rollback_word(t, 0, 0);
30 lfsr_rollback_word(t, data.nr, 1);
31 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
32 crypto1_get_lfsr(t, &key);
33 crypto1_word(t, data.cuid ^ data.nonce, 0);
34 crypto1_word(t, data.nr2, 1);
35 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
36 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
37 outkey = key;
38 counter++;
39 if (counter == 20) break;
40 }
41 }
42 isSuccess = (counter == 1);
7779d73c 43 *outputkey = ( isSuccess ) ? outkey : 0;
44 crypto1_destroy(s);
45 /* //un-comment to save all keys to a stats.txt file
46 FILE *fout;
47 if ((fout = fopen("stats.txt","ab")) == NULL) {
48 PrintAndLog("Could not create file name stats.txt");
49 return 1;
50 }
51 fprintf(fout, "mfkey32,%d,%08x,%d,%s,%04x%08x,%.0Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t)(outkey>>32) & 0xFFFF,(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
52 fclose(fout);
53 */
54 return isSuccess;
55}
56
57// recover key from 2 reader responses on 2 different tag challenges
58bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
59 struct Crypto1State *s, *t;
60 uint64_t outkey = 0;
61 uint64_t key = 0; // recovered key
62 bool isSuccess = false;
63 int counter = 0;
64
7779d73c 65 s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
66
67 for(t = s; t->odd | t->even; ++t) {
68 lfsr_rollback_word(t, 0, 0);
69 lfsr_rollback_word(t, data.nr, 1);
70 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
71 crypto1_get_lfsr(t, &key);
72
73 crypto1_word(t, data.cuid ^ data.nonce2, 0);
74 crypto1_word(t, data.nr2, 1);
75 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
76 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
77 outkey=key;
78 ++counter;
79 if (counter==20)
80 break;
81 }
82 }
83 isSuccess = (counter == 1);
7779d73c 84 *outputkey = ( isSuccess ) ? outkey : 0;
85 crypto1_destroy(s);
86 /* // un-comment to output all keys to stats.txt
87 FILE *fout;
88 if ((fout = fopen("stats.txt","ab")) == NULL) {
89 PrintAndLog("Could not create file name stats.txt");
90 return 1;
91 }
92 fprintf(fout, "moebius,%d,%08x,%d,%s,%04x%08x,%0.Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t) (outkey>>32),(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
93 fclose(fout);
94 */
95 return isSuccess;
96}
97
98// recover key from reader response and tag response of one authentication sequence
99int mfkey64(nonces_t data, uint64_t *outputkey){
100 uint64_t key = 0; // recovered key
101 uint32_t ks2; // keystream used to encrypt reader response
102 uint32_t ks3; // keystream used to encrypt tag response
103 struct Crypto1State *revstate;
104
7779d73c 105 // Extract the keystream from the messages
106 ks2 = data.ar ^ prng_successor(data.nonce, 64);
107 ks3 = data.at ^ prng_successor(data.nonce, 96);
108 revstate = lfsr_recovery64(ks2, ks3);
109 lfsr_rollback_word(revstate, 0, 0);
110 lfsr_rollback_word(revstate, 0, 0);
111 lfsr_rollback_word(revstate, data.nr, 1);
112 lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
113 crypto1_get_lfsr(revstate, &key);
114 // PrintAndLog("Found Key: [%012" PRIx64 "]", key);
115 crypto1_destroy(revstate);
116 *outputkey = key;
117
7779d73c 118 return 0;
119}
4cb4b588 120
121
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