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mock of key checking
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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
d0067d07 15#include "mifare.h"
7779d73c 16#include "crapto1/crapto1.h"
17
4cb4b588 18
7779d73c 19// recover key from 2 different reader responses on same tag challenge
20bool mfkey32(nonces_t data, uint64_t *outputkey) {
21 struct Crypto1State *s,*t;
22 uint64_t outkey = 0;
23 uint64_t key = 0; // recovered key
24 bool isSuccess = false;
25 uint8_t counter = 0;
26
7779d73c 27 s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
28
29 for(t = s; t->odd | t->even; ++t) {
30 lfsr_rollback_word(t, 0, 0);
31 lfsr_rollback_word(t, data.nr, 1);
32 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
33 crypto1_get_lfsr(t, &key);
34 crypto1_word(t, data.cuid ^ data.nonce, 0);
35 crypto1_word(t, data.nr2, 1);
36 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
37 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
38 outkey = key;
39 counter++;
40 if (counter == 20) break;
41 }
42 }
43 isSuccess = (counter == 1);
7779d73c 44 *outputkey = ( isSuccess ) ? outkey : 0;
45 crypto1_destroy(s);
46 /* //un-comment to save all keys to a stats.txt file
47 FILE *fout;
48 if ((fout = fopen("stats.txt","ab")) == NULL) {
49 PrintAndLog("Could not create file name stats.txt");
50 return 1;
51 }
52 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);
53 fclose(fout);
54 */
55 return isSuccess;
56}
57
58// recover key from 2 reader responses on 2 different tag challenges
59bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
60 struct Crypto1State *s, *t;
61 uint64_t outkey = 0;
62 uint64_t key = 0; // recovered key
63 bool isSuccess = false;
64 int counter = 0;
65
7779d73c 66 s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
67
68 for(t = s; t->odd | t->even; ++t) {
69 lfsr_rollback_word(t, 0, 0);
70 lfsr_rollback_word(t, data.nr, 1);
71 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
72 crypto1_get_lfsr(t, &key);
73
74 crypto1_word(t, data.cuid ^ data.nonce2, 0);
75 crypto1_word(t, data.nr2, 1);
76 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
77 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
78 outkey=key;
79 ++counter;
80 if (counter==20)
81 break;
82 }
83 }
84 isSuccess = (counter == 1);
7779d73c 85 *outputkey = ( isSuccess ) ? outkey : 0;
86 crypto1_destroy(s);
87 /* // un-comment to output all keys to stats.txt
88 FILE *fout;
89 if ((fout = fopen("stats.txt","ab")) == NULL) {
90 PrintAndLog("Could not create file name stats.txt");
91 return 1;
92 }
93 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);
94 fclose(fout);
95 */
96 return isSuccess;
97}
98
99// recover key from reader response and tag response of one authentication sequence
100int mfkey64(nonces_t data, uint64_t *outputkey){
101 uint64_t key = 0; // recovered key
102 uint32_t ks2; // keystream used to encrypt reader response
103 uint32_t ks3; // keystream used to encrypt tag response
104 struct Crypto1State *revstate;
105
7779d73c 106 // Extract the keystream from the messages
107 ks2 = data.ar ^ prng_successor(data.nonce, 64);
108 ks3 = data.at ^ prng_successor(data.nonce, 96);
109 revstate = lfsr_recovery64(ks2, ks3);
110 lfsr_rollback_word(revstate, 0, 0);
111 lfsr_rollback_word(revstate, 0, 0);
112 lfsr_rollback_word(revstate, data.nr, 1);
113 lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
114 crypto1_get_lfsr(revstate, &key);
115 // PrintAndLog("Found Key: [%012" PRIx64 "]", key);
116 crypto1_destroy(revstate);
117 *outputkey = key;
118
7779d73c 119 return 0;
120}
4cb4b588 121
122
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