git.zerfleddert.de Git - proxmark3-svn/blob - 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 }