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CHG: minor change initializing array.
[proxmark3-svn] / client / nonce2key / nonce2key.c
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 #define __STDC_FORMAT_MACROS
14 #include <inttypes.h>
15 #define llx PRIx64
16
17 #include "nonce2key.h"
18 #include "mifarehost.h"
19 #include "ui.h"
20
21 int compar_state(const void * a, const void * b) {
22 // didn't work: (the result is truncated to 32 bits)
23 //return (*(int64_t*)b - *(int64_t*)a);
24
25 // better:
26 if (*(int64_t*)b == *(int64_t*)a) return 0;
27 else if (*(int64_t*)b > *(int64_t*)a) return 1;
28 else return -1;
29 }
30
31 int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
32
33 struct Crypto1State *state;
34 uint32_t i, pos, rr = 0, nr_diff, key_count;//, ks1, ks2;
35 byte_t bt, ks3x[8], par[8][8];
36 uint64_t key_recovered;
37 int64_t *state_s;
38
39 static uint32_t last_uid;
40 static int64_t *last_keylist;
41
42 if (last_uid != uid && last_keylist != NULL) {
43 free(last_keylist);
44 last_keylist = NULL;
45 }
46 last_uid = uid;
47
48 // Reset the last three significant bits of the reader nonce
49 nr &= 0xffffff1f;
50
51 PrintAndLog("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08"llx")\n\n", uid, nt, par_info, ks_info, nr);
52
53 for ( pos = 0; pos < 8; pos++ ) {
54 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
55 bt = (par_info >> (pos*8)) & 0xff;
56
57 for ( i = 0; i < 8; i++) {
58 par[7-pos][i] = (bt >> i) & 0x01;
59 }
60 }
61
62 printf("|diff|{nr} |ks3|ks3^5|parity |\n");
63 printf("+----+--------+---+-----+---------------+\n");
64
65 for ( i = 0; i < 8; i++) {
66 nr_diff = nr | i << 5;
67 printf("| %02x |%08x|", i << 5, nr_diff);
68 printf(" %01x | %01x |", ks3x[i], ks3x[i]^5);
69 for (pos = 0; pos < 7; pos++)
70 printf("%01x,", par[i][pos]);
71 printf("%01x|\n", par[i][7]);
72 }
73 printf("+----+--------+---+-----+---------------+\n");
74
75 if ( par_info == 0 )
76 PrintAndLog("Parity is all zero, try special attack! Wait for few more seconds...");
77
78 state = lfsr_common_prefix(nr, rr, ks3x, par, par_info==0);
79 state_s = (int64_t*)state;
80
81 //char filename[50] ;
82 //sprintf(filename, "nt_%08x_%d.txt", nt, nr);
83 //printf("name %s\n", filename);
84 //FILE* fp = fopen(filename,"w");
85 for (i = 0; (state) && ((state + i)->odd != -1); i++)
86 {
87 lfsr_rollback_word(state+i, uid^nt, 0);
88 crypto1_get_lfsr(state + i, &key_recovered);
89 *(state_s + i) = key_recovered;
90 //fprintf(fp, "%012llx\n",key_recovered);
91 }
92 //fclose(fp);
93
94 if(!state)
95 return 1;
96
97 // quicksort statelist
98 qsort(state_s, i, sizeof(*state_s), compar_state);
99
100 // set last element marker
101 *(state_s + i) = -1;
102
103 //Create the intersection:
104 if (par_info == 0 ) {
105 if ( last_keylist != NULL) {
106 int64_t *p1, *p2, *p3;
107 p1 = p3 = last_keylist;
108 p2 = state_s;
109 while ( *p1 != -1 && *p2 != -1 ) {
110 if (compar_state(p1, p2) == 0) {
111 printf("p1:%"llx" p2:%"llx" p3:%"llx" key:%012"llx"\n",
112 (uint64_t)(p1-last_keylist),
113 (uint64_t)(p2-state_s),
114 (uint64_t)(p3-last_keylist),
115 *p1);
116 *p3++ = *p1++;
117 p2++;
118 } else {
119 while (compar_state(p1, p2) == -1) ++p1;
120 while (compar_state(p1, p2) == 1) ++p2;
121 }
122 }
123 key_count = p3 - last_keylist;
124 } else {
125 key_count = 0;
126 }
127 } else {
128 last_keylist = state_s;
129 key_count = i;
130 }
131
132 printf("key candidates count: %d\n", key_count);
133
134 // The list may still contain several key candidates. Test each of them with mfCheckKeys
135 int res;
136 uint8_t keyBlock[6];
137 uint64_t key64;
138 for (i = 0; i < key_count; i++) {
139
140 key64 = *(last_keylist + i);
141 num_to_bytes(key64, 6, keyBlock);
142 key64 = 0;
143 // Call tag to verify if key is correct
144 res = mfCheckKeys(0, 0, false, 1, keyBlock, &key64);
145 if (!res) {
146 *key = key64;
147 free(last_keylist);
148 last_keylist = NULL;
149 if (par_info == 0)
150 free(state);
151 return 0;
152 }
153 }
154
155 free(last_keylist);
156 last_keylist = state_s;
157 return 1;
158 }
159
160 // *outputkey is not used...
161 int tryMfk32(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
162
163 struct Crypto1State *s,*t;
164 uint64_t key; // recovered key
165 uint32_t uid; // serial number
166 uint32_t nt; // tag challenge
167 uint32_t nr0_enc; // first encrypted reader challenge
168 uint32_t ar0_enc; // first encrypted reader response
169 uint32_t nr1_enc; // second encrypted reader challenge
170 uint32_t ar1_enc; // second encrypted reader response
171 bool isSuccess = FALSE;
172 int counter = 0;
173
174 uid = myuid;//(uint32_t)bytes_to_num(data + 0, 4);
175 nt = *(uint32_t*)(data+8);
176 nr0_enc = *(uint32_t*)(data+12);
177 ar0_enc = *(uint32_t*)(data+16);
178 nr1_enc = *(uint32_t*)(data+32);
179 ar1_enc = *(uint32_t*)(data+36);
180
181 // PrintAndLog("recovering key for:");
182 // PrintAndLog(" uid: %08x %08x",uid, myuid);
183 // PrintAndLog(" nt: %08x",nt);
184 // PrintAndLog(" {nr_0}: %08x",nr0_enc);
185 // PrintAndLog(" {ar_0}: %08x",ar0_enc);
186 // PrintAndLog(" {nr_1}: %08x",nr1_enc);
187 // PrintAndLog(" {ar_1}: %08x",ar1_enc);
188
189 s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
190
191 for(t = s; t->odd | t->even; ++t) {
192 lfsr_rollback_word(t, 0, 0);
193 lfsr_rollback_word(t, nr0_enc, 1);
194 lfsr_rollback_word(t, uid ^ nt, 0);
195 crypto1_get_lfsr(t, &key);
196 crypto1_word(t, uid ^ nt, 0);
197 crypto1_word(t, nr1_enc, 1);
198 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
199 PrintAndLog("Found Key: [%012"llx"]", key);
200 isSuccess = TRUE;
201 ++counter;
202 if (counter==20)
203 break;
204 }
205 }
206 crypto1_destroy(t);
207 crypto1_destroy(s);
208 return isSuccess;
209 }
210
211 int tryMfk32_moebius(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
212
213 struct Crypto1State *s, *t;
214 uint64_t key; // recovered key
215 uint32_t uid; // serial number
216 uint32_t nt0; // tag challenge first
217 uint32_t nt1; // tag challenge second
218 uint32_t nr0_enc; // first encrypted reader challenge
219 uint32_t ar0_enc; // first encrypted reader response
220 uint32_t nr1_enc; // second encrypted reader challenge
221 uint32_t ar1_enc; // second encrypted reader response
222 bool isSuccess = FALSE;
223 int counter = 0;
224
225 uid = myuid;//(uint32_t)bytes_to_num(data + 0, 4);
226 nt0 = *(uint32_t*)(data+8);
227 nr0_enc = *(uint32_t*)(data+12);
228 ar0_enc = *(uint32_t*)(data+16);
229 nt1 = *(uint32_t*)(data+8);
230 nr1_enc = *(uint32_t*)(data+32);
231 ar1_enc = *(uint32_t*)(data+36);
232
233 s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
234
235 for(t = s; t->odd | t->even; ++t) {
236 lfsr_rollback_word(t, 0, 0);
237 lfsr_rollback_word(t, nr0_enc, 1);
238 lfsr_rollback_word(t, uid ^ nt0, 0);
239 crypto1_get_lfsr(t, &key);
240
241 crypto1_word(t, uid ^ nt1, 0);
242 crypto1_word(t, nr1_enc, 1);
243 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
244 PrintAndLog("Found Key: [%012"llx"]",key);
245 isSuccess = TRUE;
246 ++counter;
247 if (counter==20)
248 break;
249 }
250 }
251 crypto1_destroy(t);
252 crypto1_destroy(s);
253 return isSuccess;
254 }
255
256 int tryMfk64(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
257
258 struct Crypto1State *revstate;
259 uint64_t key; // recovered key
260 uint32_t uid; // serial number
261 uint32_t nt; // tag challenge
262 uint32_t nr_enc; // encrypted reader challenge
263 uint32_t ar_enc; // encrypted reader response
264 uint32_t at_enc; // encrypted tag response
265 uint32_t ks2; // keystream used to encrypt reader response
266 uint32_t ks3; // keystream used to encrypt tag response
267
268 struct Crypto1State mpcs = {0, 0};
269 struct Crypto1State *pcs;
270 pcs = &mpcs;
271
272 uid = myuid;//(uint32_t)bytes_to_num(data + 0, 4);
273 nt = *(uint32_t*)(data+8);
274 nr_enc = *(uint32_t*)(data+12);
275 ar_enc = *(uint32_t*)(data+16);
276
277 crypto1_word(pcs, nr_enc , 1);
278 at_enc = prng_successor(nt, 96) ^ crypto1_word(pcs, 0, 0);
279
280 // printf("Recovering key for:\n");
281 // printf(" uid: %08x\n",uid);
282 // printf(" nt: %08x\n",nt);
283 // printf(" {nr}: %08x\n",nr_enc);
284 // printf(" {ar}: %08x\n",ar_enc);
285 // printf(" {at}: %08x\n",at_enc);
286
287 // Extract the keystream from the messages
288 ks2 = ar_enc ^ prng_successor(nt, 64);
289 ks3 = at_enc ^ prng_successor(nt, 96);
290
291 revstate = lfsr_recovery64(ks2, ks3);
292 lfsr_rollback_word(revstate, 0, 0);
293 lfsr_rollback_word(revstate, 0, 0);
294 lfsr_rollback_word(revstate, nr_enc, 1);
295 lfsr_rollback_word(revstate, uid ^ nt, 0);
296 crypto1_get_lfsr(revstate, &key);
297 PrintAndLog("Found Key: [%012"llx"]",key);
298 crypto1_destroy(revstate);
299 return 0;
300 }
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