cvs.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 #include "nonce2key.h"
  13
  14 int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
  15         struct Crypto1State *state;
  16         uint32_t i, pos, rr = 0, nr_diff;
  17         byte_t bt, ks3x[8], par[8][8];
  18
  19         // Reset the last three significant bits of the reader nonce
  20         nr &= 0xffffff1f;
  21
  22         PrintAndLog("uid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08"llx")\n", uid, nt, par_info, ks_info, nr);
  23
  24         for ( pos = 0; pos < 8; pos++ ) {
  25                 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  26                 bt = (par_info >> (pos*8)) & 0xff;
  27
  28                 for ( i = 0; i < 8; i++) {
  29                         par[7-pos][i] = (bt >> i) & 0x01;
  30                 }
  31         }
  32
  33         printf("+----+--------+---+-----+---------------+\n");
  34         printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
  35         printf("+----+--------+---+-----+---------------+\n");
  36         for ( i = 0; i < 8; i++) {
  37                 nr_diff = nr | i << 5;
  38                 printf("| %02x |%08x| %01x |  %01x  |", i << 5, nr_diff, ks3x[i], ks3x[i]^5);
  39
  40                 for (pos = 0; pos < 7; pos++) printf("%01x,", par[i][pos]);
  41                 printf("%01x|\n", par[i][7]);
  42         }
  43         printf("+----+--------+---+-----+---------------+\n");
  44
  45         clock_t t1 = clock();
  46
  47         state = lfsr_common_prefix(nr, rr, ks3x, par);
  48         lfsr_rollback_word(state, uid ^ nt, 0);
  49         crypto1_get_lfsr(state, key);
  50         crypto1_destroy(state);
  51
  52         t1 = clock() - t1;
  53         if ( t1 > 0 ) PrintAndLog("Time in nonce2key: %.0f ticks \n", (float)t1);
  54         return 0;
  55 }
  56
  57 // call when PAR == 0,  special attack?  It seems to need two calls.  with same uid, block, keytype
  58 int nonce2key_ex(uint8_t blockno, uint8_t keytype, uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint64_t * key) {
  59
  60         struct Crypto1State *state;
  61         uint32_t i, pos, key_count;
  62         byte_t ks3x[8];
  63
  64         uint64_t key_recovered;
  65
  66         int64_t *state_s;
  67         static uint8_t last_blockno;
  68         static uint8_t last_keytype;
  69         static uint32_t last_uid;
  70         static int64_t *last_keylist;
  71
  72         if (last_uid != uid &&
  73                 last_blockno != blockno &&
  74                 last_keytype != keytype &&
  75                 last_keylist != NULL)
  76         {
  77                 free(last_keylist);
  78                 last_keylist = NULL;
  79         }
  80         last_uid = uid;
  81         last_blockno = blockno;
  82         last_keytype = keytype;
  83
  84         // Reset the last three significant bits of the reader nonce
  85         nr &= 0xffffff1f;
  86
  87         PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08"llx")\n", uid, nt, ks_info, nr);
  88
  89         for (pos=0; pos<8; pos++) {
  90                 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  91         }
  92
  93         PrintAndLog("parity is all zero, try special attack. Just wait for few more seconds...");
  94
  95         state = lfsr_common_prefix_ex(nr, ks3x);
  96         state_s = (int64_t*)state;
  97         PrintAndLog("Prefix");
  98
  99         for (i = 0; (state) && ((state + i)->odd != -1); i++) {
 100                 lfsr_rollback_word(state + i, uid ^ nt, 0);
 101                 crypto1_get_lfsr(state + i, &key_recovered);
 102                 *(state_s + i) = key_recovered;
 103         }
 104
 105         PrintAndLog("zero");
 106         if(!state)
 107                 return 1;
 108
 109         qsort(state_s, i, sizeof(*state_s), compar_int);
 110         *(state_s + i) = -1;
 111
 112         //Create the intersection:
 113         if ( last_keylist != NULL) {
 114
 115                 int64_t *p1, *p2, *p3;
 116                 p1 = p3 = last_keylist;
 117                 p2 = state_s;
 118
 119                 PrintAndLog("one");
 120                 while ( *p1 != -1 && *p2 != -1 ) {
 121                         if (compar_int(p1, p2) == 0) {
 122                                 printf("p1:%"llx" p2:%"llx" p3:%"llx" key:%012"llx"\n",(uint64_t)(p1-last_keylist),(uint64_t)(p2-state_s),(uint64_t)(p3-last_keylist),*p1);
 123                                 *p3++ = *p1++;
 124                                 p2++;
 125                         }
 126                         else {
 127                                 while (compar_int(p1, p2) == -1) ++p1;
 128                                 while (compar_int(p1, p2) == 1) ++p2;
 129                         }
 130                 }
 131                 key_count = p3 - last_keylist;;
 132         } else {
 133                 key_count = 0;
 134         }
 135
 136         printf("key_count:%d\n", key_count);
 137
 138         // The list may still contain several key candidates. Test each of them with mfCheckKeys
 139         uint8_t keyBlock[6] = {0,0,0,0,0,0};
 140         uint64_t key64;
 141         PrintAndLog("two");
 142         for (i = 0; i < key_count; i++) {
 143                 key64 = *(last_keylist + i);
 144                 num_to_bytes(key64, 6, keyBlock);
 145                 key64 = 0;
 146                 if (!mfCheckKeys(blockno, keytype, false, 1, keyBlock, &key64)) {
 147                         *key = key64;
 148                         free(last_keylist);
 149                         last_keylist = NULL;
 150                         free(state);
 151                         return 0;
 152                 }
 153         }
 154
 155         free(last_keylist);
 156         last_keylist = state_s;
 157         return 1;
 158 }
 159
 160 // 32 bit recover key from 2 nonces
 161 bool tryMfk32(nonces_t data, uint64_t *outputkey) {
 162         struct Crypto1State *s,*t;
 163         uint64_t outkey = 0;
 164         uint64_t key=0;     // recovered key
 165         uint32_t uid     = data.cuid;
 166         uint32_t nt      = data.nonce;  // first tag challenge (nonce)
 167         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 168         uint32_t ar0_enc = data.ar;  // first encrypted reader response
 169         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 170         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 171         clock_t t1 = clock();
 172         bool isSuccess = FALSE;
 173         uint8_t counter = 0;
 174
 175
 176         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
 177
 178         for(t = s; t->odd | t->even; ++t) {
 179                 lfsr_rollback_word(t, 0, 0);
 180                 lfsr_rollback_word(t, nr0_enc, 1);
 181                 lfsr_rollback_word(t, uid ^ nt, 0);
 182                 crypto1_get_lfsr(t, &key);
 183                 crypto1_word(t, uid ^ nt, 0);
 184                 crypto1_word(t, nr1_enc, 1);
 185                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
 186                         //PrintAndLog("Found Key: [%012"llx"]", key);
 187                         outkey = key;
 188                         ++counter;
 189                         if (counter==20) break;
 190                 }
 191         }
 192         isSuccess = (counter > 0);
 193         t1 = clock() - t1;
 194         if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.0f ticks  - possible keys %d\n", (float)t1, counter);
 195         *outputkey = ( isSuccess ) ? outkey : 0;
 196         crypto1_destroy(s);
 197         return isSuccess;
 198 }
 199
 200 bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
 201         struct Crypto1State *s, *t;
 202         uint64_t outkey  = 0;
 203         uint64_t key     = 0;                        // recovered key
 204         uint32_t uid     = data.cuid;
 205         uint32_t nt0     = data.nonce;  // first tag challenge (nonce)
 206         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 207         uint32_t ar0_enc = data.ar; // first encrypted reader response
 208         //uint32_t uid1    = le32toh(data+16);
 209         uint32_t nt1     = data.nonce2; // second tag challenge (nonce)
 210         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 211         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 212         bool isSuccess = FALSE;
 213         int counter = 0;
 214
 215         //PrintAndLog("Enter mfkey32_moebius");
 216         clock_t t1 = clock();
 217
 218         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
 219
 220         for(t = s; t->odd | t->even; ++t) {
 221                 lfsr_rollback_word(t, 0, 0);
 222                 lfsr_rollback_word(t, nr0_enc, 1);
 223                 lfsr_rollback_word(t, uid ^ nt0, 0);
 224                 crypto1_get_lfsr(t, &key);
 225
 226                 crypto1_word(t, uid ^ nt1, 0);
 227                 crypto1_word(t, nr1_enc, 1);
 228                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
 229                         //PrintAndLog("Found Key: [%012"llx"]",key);
 230                         outkey=key;
 231                         ++counter;
 232                         if (counter==20) break;
 233                 }
 234         }
 235     isSuccess   = (counter > 0);
 236         t1 = clock() - t1;
 237         if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.0f ticks  - possible keys %d\n", (float)t1, counter);
 238         *outputkey = ( isSuccess ) ? outkey : 0;
 239         crypto1_destroy(s);
 240         return isSuccess;
 241 }
 242
 243 int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
 244         uint32_t uid    = le32toh(data);
 245         uint32_t nt     = le32toh(data+4);  // tag challenge
 246         uint32_t nr_enc = le32toh(data+8);  // encrypted reader challenge
 247         uint32_t ar_enc = le32toh(data+12); // encrypted reader response
 248         uint32_t at_enc = le32toh(data+16);     // encrypted tag response
 249         return tryMfk64(uid, nt, nr_enc, ar_enc, at_enc, outputkey);
 250 }
 251
 252 int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
 253         uint64_t key    = 0;                            // recovered key
 254         uint32_t ks2;                                           // keystream used to encrypt reader response
 255         uint32_t ks3;                                           // keystream used to encrypt tag response
 256         struct Crypto1State *revstate;
 257
 258         PrintAndLog("Enter mfkey64");
 259         clock_t t1 = clock();
 260
 261         // Extract the keystream from the messages
 262         ks2 = ar_enc ^ prng_successor(nt, 64);
 263         ks3 = at_enc ^ prng_successor(nt, 96);
 264         revstate = lfsr_recovery64(ks2, ks3);
 265         lfsr_rollback_word(revstate, 0, 0);
 266         lfsr_rollback_word(revstate, 0, 0);
 267         lfsr_rollback_word(revstate, nr_enc, 1);
 268         lfsr_rollback_word(revstate, uid ^ nt, 0);
 269         crypto1_get_lfsr(revstate, &key);
 270         PrintAndLog("Found Key: [%012"llx"]", key);
 271         crypto1_destroy(revstate);
 272         *outputkey = key;
 273
 274         t1 = clock() - t1;
 275         if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.0f ticks \n", (float)t1);
 276         return 0;
 277 }