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 "nonce2key.h"
  14
  15 #include <inttypes.h>
  16 #include "mifarehost.h"
  17 #include "ui.h"
  18 #include "util.h"
  19 #include "crapto1/crapto1.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   struct Crypto1State *state;
  33   uint32_t i, pos, rr, nr_diff, key_count;//, ks1, ks2;
  34   uint8_t bt, ks3x[8], par[8][8];
  35   uint64_t key_recovered;
  36   int64_t *state_s;
  37   static uint32_t last_uid;
  38   static int64_t *last_keylist;
  39   rr = 0;
  40
  41   if (last_uid != uid && last_keylist != NULL)
  42   {
  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" PRIx64") ks(%016" PRIx64") nr(%08" PRIx32")\n\n",uid,nt,par_info,ks_info,nr);
  52
  53   for (pos=0; pos<8; pos++)
  54   {
  55     ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  56     bt = (par_info >> (pos*8)) & 0xff;
  57     for (i=0; i<8; i++)
  58     {
  59       par[7-pos][i] = (bt >> i) & 0x01;
  60     }
  61   }
  62
  63   printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
  64   printf("+----+--------+---+-----+---------------+\n");
  65   for (i=0; i<8; i++)
  66   {
  67     nr_diff = nr | i << 5;
  68     printf("| %02x |%08x|",i << 5, nr_diff);
  69     printf(" %01x |  %01x  |",ks3x[i], ks3x[i]^5);
  70     for (pos=0; pos<7; pos++) printf("%01x,", par[i][pos]);
  71     printf("%01x|\n", par[i][7]);
  72   }
  73
  74         if (par_info == 0)
  75                 PrintAndLog("Parity is all zero, trying special attack! Just wait for few more seconds...");
  76
  77         state = lfsr_common_prefix(nr, rr, ks3x, par);
  78         state_s = (int64_t*)state;
  79
  80         //char filename[50] ;
  81     //sprintf(filename, "nt_%08x_%d.txt", nt, nr);
  82     //printf("name %s\n", filename);
  83         //FILE* fp = fopen(filename,"w");
  84         for (i = 0; (state) && *(state_s + i); i++)
  85         {
  86                 lfsr_rollback_word(state+i, uid^nt, 0);
  87                 crypto1_get_lfsr(state + i, &key_recovered);
  88                 *(state_s + i) = key_recovered;
  89                 //fprintf(fp, "%012" PRIx64 "\n",key_recovered);
  90         }
  91         //fclose(fp);
  92
  93         if(!state)
  94                 return 1;
  95
  96         qsort(state_s, i, sizeof(*state_s), compar_state);
  97         *(state_s + i) = -1;
  98
  99         //Create the intersection:
 100         if (par_info == 0 ) {
 101                 if (last_keylist != NULL) {
 102                         int64_t *p1, *p2, *p3;
 103                         p1 = p3 = last_keylist;
 104                         p2 = state_s;
 105                         while ( *p1 != -1 && *p2 != -1 ) {
 106                                 if (compar_state(p1, p2) == 0) {
 107                                         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);
 108                                         *p3++ = *p1++;
 109                                         p2++;
 110                                 }
 111                                 else {
 112                                         while (compar_state(p1, p2) == -1) ++p1;
 113                                         while (compar_state(p1, p2) == 1) ++p2;
 114                                 }
 115                         }
 116                         key_count = p3 - last_keylist;
 117                 } else {
 118                         key_count = 0;
 119                 }
 120         } else {
 121                 last_keylist = state_s;
 122                 key_count = i;
 123         }
 124
 125         printf("key_count:%d\n", key_count);
 126
 127         // The list may still contain several key candidates. Test each of them with mfCheckKeys
 128         for (i = 0; i < key_count; i++) {
 129                 uint8_t keyBlock[6];
 130                 uint64_t key64;
 131                 key64 = *(last_keylist + i);
 132                 num_to_bytes(key64, 6, keyBlock);
 133                 key64 = 0;
 134                 if (!mfCheckKeys(0, 0, false, 1, keyBlock, &key64)) {
 135                         *key = key64;
 136                         free(last_keylist);
 137                         last_keylist = NULL;
 138                         if (par_info == 0)
 139                                 free(state);
 140                         return 0;
 141                 }
 142         }
 143
 144
 145         free(last_keylist);
 146         last_keylist = state_s;
 147
 148         return 1;
 149 }
 150
 151 // 32 bit recover key from 2 nonces
 152 bool mfkey32(nonces_t data, uint64_t *outputkey) {
 153         struct Crypto1State *s,*t;
 154         uint64_t outkey = 0;
 155         uint64_t key=0;     // recovered key
 156         uint32_t uid     = data.cuid;
 157         uint32_t nt      = data.nonce;  // first tag challenge (nonce)
 158         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 159         uint32_t ar0_enc = data.ar;  // first encrypted reader response
 160         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 161         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 162         uint64_t t1 = msclock();
 163         bool isSuccess = false;
 164         uint8_t counter=0;
 165
 166         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
 167
 168         for(t = s; t->odd | t->even; ++t) {
 169                 lfsr_rollback_word(t, 0, 0);
 170                 lfsr_rollback_word(t, nr0_enc, 1);
 171                 lfsr_rollback_word(t, uid ^ nt, 0);
 172                 crypto1_get_lfsr(t, &key);
 173                 crypto1_word(t, uid ^ nt, 0);
 174                 crypto1_word(t, nr1_enc, 1);
 175                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
 176                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
 177                         outkey = key;
 178                         counter++;
 179                         if (counter==20) break;
 180                 }
 181         }
 182         isSuccess = (counter == 1);
 183         t1 = msclock() - t1;
 184         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
 185         *outputkey = ( isSuccess ) ? outkey : 0;
 186         crypto1_destroy(s);
 187         /* //un-comment to save all keys to a stats.txt file
 188         FILE *fout;
 189         if ((fout = fopen("stats.txt","ab")) == NULL) {
 190                 PrintAndLog("Could not create file name stats.txt");
 191                 return 1;
 192         }
 193         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);
 194         fclose(fout);
 195         */
 196         return isSuccess;
 197 }
 198
 199 bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
 200         struct Crypto1State *s, *t;
 201         uint64_t outkey  = 0;
 202         uint64_t key       = 0;                      // recovered key
 203         uint32_t uid     = data.cuid;
 204         uint32_t nt0     = data.nonce;  // first tag challenge (nonce)
 205         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 206         uint32_t ar0_enc = data.ar; // first encrypted reader response
 207         uint32_t nt1     = data.nonce2; // second tag challenge (nonce)
 208         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 209         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 210         bool isSuccess = false;
 211         int counter = 0;
 212
 213         //PrintAndLog("Enter mfkey32_moebius");
 214         uint64_t t1 = msclock();
 215
 216         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
 217
 218         for(t = s; t->odd | t->even; ++t) {
 219                 lfsr_rollback_word(t, 0, 0);
 220                 lfsr_rollback_word(t, nr0_enc, 1);
 221                 lfsr_rollback_word(t, uid ^ nt0, 0);
 222                 crypto1_get_lfsr(t, &key);
 223
 224                 crypto1_word(t, uid ^ nt1, 0);
 225                 crypto1_word(t, nr1_enc, 1);
 226                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
 227                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
 228                         outkey=key;
 229                         ++counter;
 230                         if (counter==20)
 231                                 break;
 232                 }
 233         }
 234         isSuccess       = (counter == 1);
 235         t1 = msclock() - t1;
 236         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
 237         *outputkey = ( isSuccess ) ? outkey : 0;
 238         crypto1_destroy(s);
 239         /* // un-comment to output all keys to stats.txt
 240         FILE *fout;
 241         if ((fout = fopen("stats.txt","ab")) == NULL) {
 242                 PrintAndLog("Could not create file name stats.txt");
 243                 return 1;
 244         }
 245         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);
 246         fclose(fout);
 247         */
 248         return isSuccess;
 249 }
 250
 251 int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
 252         uint32_t uid    = le32toh(data);
 253         uint32_t nt     = le32toh(data+4);  // tag challenge
 254         uint32_t nr_enc = le32toh(data+8);  // encrypted reader challenge
 255         uint32_t ar_enc = le32toh(data+12); // encrypted reader response
 256         uint32_t at_enc = le32toh(data+16);     // encrypted tag response
 257         return tryMfk64(uid, nt, nr_enc, ar_enc, at_enc, outputkey);
 258 }
 259
 260 int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
 261         uint64_t key    = 0;                            // recovered key
 262         uint32_t ks2;                                           // keystream used to encrypt reader response
 263         uint32_t ks3;                                           // keystream used to encrypt tag response
 264         struct Crypto1State *revstate;
 265
 266         PrintAndLog("Enter mfkey64");
 267         uint64_t t1 = msclock();
 268
 269         // Extract the keystream from the messages
 270         ks2 = ar_enc ^ prng_successor(nt, 64);
 271         ks3 = at_enc ^ prng_successor(nt, 96);
 272         revstate = lfsr_recovery64(ks2, ks3);
 273         lfsr_rollback_word(revstate, 0, 0);
 274         lfsr_rollback_word(revstate, 0, 0);
 275         lfsr_rollback_word(revstate, nr_enc, 1);
 276         lfsr_rollback_word(revstate, uid ^ nt, 0);
 277         crypto1_get_lfsr(revstate, &key);
 278         PrintAndLog("Found Key: [%012" PRIx64 "]", key);
 279         crypto1_destroy(revstate);
 280         *outputkey = key;
 281
 282         t1 = msclock() - t1;
 283         if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.1f seconds \n", (float)t1/1000.0);
 284         return 0;
 285 }
 286