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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
13 #include "nonce2key.h"
14
15 #include <inttypes.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include "mifarehost.h"
19 #include "util.h"
20 #include "crapto1/crapto1.h"
21
22 // recover key from 2 different reader responses on same tag challenge
23 bool mfkey32(nonces_t data, uint64_t *outputkey) {
24 struct Crypto1State *s,*t;
25 uint64_t outkey = 0;
26 uint64_t key = 0; // recovered key
27 bool isSuccess = false;
28 uint8_t counter = 0;
29
30 uint64_t t1 = msclock();
31
32 s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
33
34 for(t = s; t->odd | t->even; ++t) {
35 lfsr_rollback_word(t, 0, 0);
36 lfsr_rollback_word(t, data.nr, 1);
37 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
38 crypto1_get_lfsr(t, &key);
39 crypto1_word(t, data.cuid ^ data.nonce, 0);
40 crypto1_word(t, data.nr2, 1);
41 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
42 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
43 outkey = key;
44 counter++;
45 if (counter == 20) break;
46 }
47 }
48 isSuccess = (counter == 1);
49 t1 = msclock() - t1;
50 //if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
51 *outputkey = ( isSuccess ) ? outkey : 0;
52 crypto1_destroy(s);
53 /* //un-comment to save all keys to a stats.txt file
54 FILE *fout;
55 if ((fout = fopen("stats.txt","ab")) == NULL) {
56 PrintAndLog("Could not create file name stats.txt");
57 return 1;
58 }
59 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);
60 fclose(fout);
61 */
62 return isSuccess;
63 }
64
65 // recover key from 2 reader responses on 2 different tag challenges
66 bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
67 struct Crypto1State *s, *t;
68 uint64_t outkey = 0;
69 uint64_t key = 0; // recovered key
70 bool isSuccess = false;
71 int counter = 0;
72
73 //PrintAndLog("Enter mfkey32_moebius");
74 uint64_t t1 = msclock();
75
76 s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
77
78 for(t = s; t->odd | t->even; ++t) {
79 lfsr_rollback_word(t, 0, 0);
80 lfsr_rollback_word(t, data.nr, 1);
81 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
82 crypto1_get_lfsr(t, &key);
83
84 crypto1_word(t, data.cuid ^ data.nonce2, 0);
85 crypto1_word(t, data.nr2, 1);
86 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
87 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
88 outkey=key;
89 ++counter;
90 if (counter==20)
91 break;
92 }
93 }
94 isSuccess = (counter == 1);
95 t1 = msclock() - t1;
96 // PrintAndLog("Time in mfkey32_moebius: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
97 *outputkey = ( isSuccess ) ? outkey : 0;
98 crypto1_destroy(s);
99 /* // un-comment to output all keys to stats.txt
100 FILE *fout;
101 if ((fout = fopen("stats.txt","ab")) == NULL) {
102 PrintAndLog("Could not create file name stats.txt");
103 return 1;
104 }
105 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);
106 fclose(fout);
107 */
108 return isSuccess;
109 }
110
111 // recover key from reader response and tag response of one authentication sequence
112 int mfkey64(nonces_t data, uint64_t *outputkey){
113 uint64_t key = 0; // recovered key
114 uint32_t ks2; // keystream used to encrypt reader response
115 uint32_t ks3; // keystream used to encrypt tag response
116 struct Crypto1State *revstate;
117
118 // PrintAndLog("Enter mfkey64");
119 uint64_t t1 = msclock();
120
121 // Extract the keystream from the messages
122 ks2 = data.ar ^ prng_successor(data.nonce, 64);
123 ks3 = data.at ^ prng_successor(data.nonce, 96);
124 revstate = lfsr_recovery64(ks2, ks3);
125 lfsr_rollback_word(revstate, 0, 0);
126 lfsr_rollback_word(revstate, 0, 0);
127 lfsr_rollback_word(revstate, data.nr, 1);
128 lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
129 crypto1_get_lfsr(revstate, &key);
130 // PrintAndLog("Found Key: [%012" PRIx64 "]", key);
131 crypto1_destroy(revstate);
132 *outputkey = key;
133
134 t1 = msclock() - t1;
135 // PrintAndLog("Time in mfkey64: %.1f seconds \n", (float)t1/1000.0);
136 return 0;
137 }
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