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 #include <inttypes.h>
  14 #include <time.h>
  15
  16 #include "nonce2key.h"
  17 #include "mifarehost.h"
  18 #include "ui.h"
  19 #include "util.h"
  20 #include "crapto1/crapto1.h"
  21
  22 int compar_state(const void * a, const void * b) {
  23         // didn't work: (the result is truncated to 32 bits)
  24         //return (*(int64_t*)b - *(int64_t*)a);
  25
  26         // better:
  27         if (*(int64_t*)b == *(int64_t*)a) return 0;
  28         else if (*(int64_t*)b > *(int64_t*)a) return 1;
  29         else return -1;
  30 }
  31
  32 int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
  33   struct Crypto1State *state;
  34   uint32_t i, pos, rr, nr_diff, key_count;//, ks1, ks2;
  35   uint8_t bt, ks3x[8], par[8][8];
  36   uint64_t key_recovered;
  37   int64_t *state_s;
  38   static uint32_t last_uid;
  39   static int64_t *last_keylist;
  40   rr = 0;
  41
  42   if (last_uid != uid && last_keylist != NULL)
  43   {
  44         free(last_keylist);
  45         last_keylist = NULL;
  46   }
  47   last_uid = uid;
  48
  49   // Reset the last three significant bits of the reader nonce
  50   nr &= 0xffffff1f;
  51
  52   PrintAndLog("\nuid(%08x) nt(%08x) par(%016" PRIx64") ks(%016" PRIx64") nr(%08" PRIx32")\n\n",uid,nt,par_info,ks_info,nr);
  53
  54   for (pos=0; pos<8; pos++)
  55   {
  56     ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  57     bt = (par_info >> (pos*8)) & 0xff;
  58     for (i=0; i<8; i++)
  59     {
  60       par[7-pos][i] = (bt >> i) & 0x01;
  61     }
  62   }
  63
  64   printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
  65   printf("+----+--------+---+-----+---------------+\n");
  66   for (i=0; i<8; i++)
  67   {
  68     nr_diff = nr | i << 5;
  69     printf("| %02x |%08x|",i << 5, nr_diff);
  70     printf(" %01x |  %01x  |",ks3x[i], ks3x[i]^5);
  71     for (pos=0; pos<7; pos++) printf("%01x,", par[i][pos]);
  72     printf("%01x|\n", par[i][7]);
  73   }
  74
  75         if (par_info==0)
  76                 PrintAndLog("parity is all zero,try special attack!just wait for few more seconds...");
  77
  78         state = lfsr_common_prefix(nr, rr, ks3x, par);
  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, "%012" PRIx64 "\n",key_recovered);
  91         }
  92         //fclose(fp);
  93
  94         if(!state)
  95                 return 1;
  96
  97         qsort(state_s, i, sizeof(*state_s), compar_state);
  98         *(state_s + i) = -1;
  99
 100         //Create the intersection:
 101         if (par_info == 0 )
 102                 if ( last_keylist != NULL)
 103                 {
 104                         int64_t *p1, *p2, *p3;
 105                         p1 = p3 = last_keylist;
 106                         p2 = state_s;
 107                         while ( *p1 != -1 && *p2 != -1 ) {
 108                                 if (compar_state(p1, p2) == 0) {
 109                                         printf("p1:%" PRIx64" p2:%" PRIx64 " p3:%" PRIx64" key:%012" PRIx64 "\n",(uint64_t)(p1-last_keylist),(uint64_t)(p2-state_s),(uint64_t)(p3-last_keylist),*p1);
 110                                         *p3++ = *p1++;
 111                                         p2++;
 112                                 }
 113                                 else {
 114                                         while (compar_state(p1, p2) == -1) ++p1;
 115                                         while (compar_state(p1, p2) == 1) ++p2;
 116                                 }
 117                         }
 118                         key_count = p3 - last_keylist;;
 119                 }
 120                 else
 121                         key_count = 0;
 122         else
 123         {
 124                 last_keylist = state_s;
 125                 key_count = i;
 126         }
 127
 128         printf("key_count:%d\n", key_count);
 129
 130         // The list may still contain several key candidates. Test each of them with mfCheckKeys
 131         for (i = 0; i < key_count; i++) {
 132                 uint8_t keyBlock[6];
 133                 uint64_t key64;
 134                 key64 = *(last_keylist + i);
 135                 num_to_bytes(key64, 6, keyBlock);
 136                 key64 = 0;
 137                 if (!mfCheckKeys(0, 0, false, 1, keyBlock, &key64)) {
 138                         *key = key64;
 139                         free(last_keylist);
 140                         last_keylist = NULL;
 141                         if (par_info ==0)
 142                                 free(state);
 143                         return 0;
 144                 }
 145         }
 146
 147
 148         free(last_keylist);
 149         last_keylist = state_s;
 150
 151         return 1;
 152 }
 153
 154 // 32 bit recover key from 2 nonces
 155 bool mfkey32(nonces_t data, uint64_t *outputkey) {
 156         struct Crypto1State *s,*t;
 157         uint64_t outkey = 0;
 158         uint64_t key=0;     // recovered key
 159         uint32_t uid     = data.cuid;
 160         uint32_t nt      = data.nonce;  // first tag challenge (nonce)
 161         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 162         uint32_t ar0_enc = data.ar;  // first encrypted reader response
 163         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 164         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 165         clock_t t1 = clock();
 166         bool isSuccess = false;
 167         uint8_t counter=0;
 168
 169         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
 170
 171         for(t = s; t->odd | t->even; ++t) {
 172                 lfsr_rollback_word(t, 0, 0);
 173                 lfsr_rollback_word(t, nr0_enc, 1);
 174                 lfsr_rollback_word(t, uid ^ nt, 0);
 175                 crypto1_get_lfsr(t, &key);
 176                 crypto1_word(t, uid ^ nt, 0);
 177                 crypto1_word(t, nr1_enc, 1);
 178                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
 179                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
 180                         outkey = key;
 181                         counter++;
 182                         if (counter==20) break;
 183                 }
 184         }
 185         isSuccess = (counter == 1);
 186         t1 = clock() - t1;
 187         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.0f ticks \nFound %d possible keys", (float)t1, counter);
 188         *outputkey = ( isSuccess ) ? outkey : 0;
 189         crypto1_destroy(s);
 190         /* //un-comment to save all keys to a stats.txt file
 191         FILE *fout;
 192         if ((fout = fopen("stats.txt","ab")) == NULL) {
 193                 PrintAndLog("Could not create file name stats.txt");
 194                 return 1;
 195         }
 196         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);
 197         fclose(fout);
 198         */
 199         return isSuccess;
 200 }
 201
 202 bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
 203         struct Crypto1State *s, *t;
 204         uint64_t outkey  = 0;
 205         uint64_t key       = 0;                      // recovered key
 206         uint32_t uid     = data.cuid;
 207         uint32_t nt0     = data.nonce;  // first tag challenge (nonce)
 208         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 209         uint32_t ar0_enc = data.ar; // first encrypted reader response
 210         uint32_t nt1     = data.nonce2; // second tag challenge (nonce)
 211         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 212         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 213         bool isSuccess = false;
 214         int counter = 0;
 215
 216         //PrintAndLog("Enter mfkey32_moebius");
 217         clock_t t1 = clock();
 218
 219         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
 220
 221         for(t = s; t->odd | t->even; ++t) {
 222                 lfsr_rollback_word(t, 0, 0);
 223                 lfsr_rollback_word(t, nr0_enc, 1);
 224                 lfsr_rollback_word(t, uid ^ nt0, 0);
 225                 crypto1_get_lfsr(t, &key);
 226
 227                 crypto1_word(t, uid ^ nt1, 0);
 228                 crypto1_word(t, nr1_enc, 1);
 229                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
 230                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
 231                         outkey=key;
 232                         ++counter;
 233                         if (counter==20)
 234                                 break;
 235                 }
 236         }
 237         isSuccess       = (counter == 1);
 238         t1 = clock() - t1;
 239         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.0f ticks \nFound %d possible keys", (float)t1,counter);
 240         *outputkey = ( isSuccess ) ? outkey : 0;
 241         crypto1_destroy(s);
 242         /* // un-comment to output all keys to stats.txt
 243         FILE *fout;
 244         if ((fout = fopen("stats.txt","ab")) == NULL) {
 245                 PrintAndLog("Could not create file name stats.txt");
 246                 return 1;
 247         }
 248         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);
 249         fclose(fout);
 250         */
 251         return isSuccess;
 252 }
 253
 254 int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
 255         uint32_t uid    = le32toh(data);
 256         uint32_t nt     = le32toh(data+4);  // tag challenge
 257         uint32_t nr_enc = le32toh(data+8);  // encrypted reader challenge
 258         uint32_t ar_enc = le32toh(data+12); // encrypted reader response
 259         uint32_t at_enc = le32toh(data+16);     // encrypted tag response
 260         return tryMfk64(uid, nt, nr_enc, ar_enc, at_enc, outputkey);
 261 }
 262
 263 int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
 264         uint64_t key    = 0;                            // recovered key
 265         uint32_t ks2;                                           // keystream used to encrypt reader response
 266         uint32_t ks3;                                           // keystream used to encrypt tag response
 267         struct Crypto1State *revstate;
 268
 269         PrintAndLog("Enter mfkey64");
 270         clock_t t1 = clock();
 271
 272         // Extract the keystream from the messages
 273         ks2 = ar_enc ^ prng_successor(nt, 64);
 274         ks3 = at_enc ^ prng_successor(nt, 96);
 275         revstate = lfsr_recovery64(ks2, ks3);
 276         lfsr_rollback_word(revstate, 0, 0);
 277         lfsr_rollback_word(revstate, 0, 0);
 278         lfsr_rollback_word(revstate, nr_enc, 1);
 279         lfsr_rollback_word(revstate, uid ^ nt, 0);
 280         crypto1_get_lfsr(revstate, &key);
 281         PrintAndLog("Found Key: [%012" PRIx64 "]", key);
 282         crypto1_destroy(revstate);
 283         *outputkey = key;
 284
 285         t1 = clock() - t1;
 286         if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.0f ticks \n", (float)t1);
 287         return 0;
 288 }
 289