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
  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, trying 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_s + i); 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                         int64_t *p1, *p2, *p3;
 104                         p1 = p3 = last_keylist;
 105                         p2 = state_s;
 106                         while ( *p1 != -1 && *p2 != -1 ) {
 107                                 if (compar_state(p1, p2) == 0) {
 108                                         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);
 109                                         *p3++ = *p1++;
 110                                         p2++;
 111                                 }
 112                                 else {
 113                                         while (compar_state(p1, p2) == -1) ++p1;
 114                                         while (compar_state(p1, p2) == 1) ++p2;
 115                                 }
 116                         }
 117                         key_count = p3 - last_keylist;
 118                 } else {
 119                         key_count = 0;
 120                 }
 121         } else {
 122                 last_keylist = state_s;
 123                 key_count = i;
 124         }
 125
 126         printf("key_count:%d\n", key_count);
 127
 128         // The list may still contain several key candidates. Test each of them with mfCheckKeys
 129         for (i = 0; i < key_count; i++) {
 130                 uint8_t keyBlock[6];
 131                 uint64_t key64;
 132                 key64 = *(last_keylist + i);
 133                 num_to_bytes(key64, 6, keyBlock);
 134                 key64 = 0;
 135                 if (!mfCheckKeys(0, 0, false, 1, keyBlock, &key64)) {
 136                         *key = key64;
 137                         free(last_keylist);
 138                         last_keylist = NULL;
 139                         if (par_info == 0)
 140                                 free(state);
 141                         return 0;
 142                 }
 143         }
 144
 145
 146         free(last_keylist);
 147         last_keylist = state_s;
 148
 149         return 1;
 150 }
 151
 152 // 32 bit recover key from 2 nonces
 153 bool mfkey32(nonces_t data, uint64_t *outputkey) {
 154         struct Crypto1State *s,*t;
 155         uint64_t outkey = 0;
 156         uint64_t key=0;     // recovered key
 157         uint32_t uid     = data.cuid;
 158         uint32_t nt      = data.nonce;  // first tag challenge (nonce)
 159         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 160         uint32_t ar0_enc = data.ar;  // first encrypted reader response
 161         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 162         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 163         clock_t t1 = clock();
 164         bool isSuccess = false;
 165         uint8_t counter=0;
 166
 167         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
 168
 169         for(t = s; t->odd | t->even; ++t) {
 170                 lfsr_rollback_word(t, 0, 0);
 171                 lfsr_rollback_word(t, nr0_enc, 1);
 172                 lfsr_rollback_word(t, uid ^ nt, 0);
 173                 crypto1_get_lfsr(t, &key);
 174                 crypto1_word(t, uid ^ nt, 0);
 175                 crypto1_word(t, nr1_enc, 1);
 176                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
 177                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
 178                         outkey = key;
 179                         counter++;
 180                         if (counter==20) break;
 181                 }
 182         }
 183         isSuccess = (counter == 1);
 184         t1 = clock() - t1;
 185         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.0f ticks \nFound %d possible keys", (float)t1, counter);
 186         *outputkey = ( isSuccess ) ? outkey : 0;
 187         crypto1_destroy(s);
 188         /* //un-comment to save all keys to a stats.txt file
 189         FILE *fout;
 190         if ((fout = fopen("stats.txt","ab")) == NULL) {
 191                 PrintAndLog("Could not create file name stats.txt");
 192                 return 1;
 193         }
 194         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);
 195         fclose(fout);
 196         */
 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 nt1     = data.nonce2; // second tag challenge (nonce)
 209         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 210         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 211         bool isSuccess = false;
 212         int counter = 0;
 213
 214         //PrintAndLog("Enter mfkey32_moebius");
 215         clock_t t1 = clock();
 216
 217         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
 218
 219         for(t = s; t->odd | t->even; ++t) {
 220                 lfsr_rollback_word(t, 0, 0);
 221                 lfsr_rollback_word(t, nr0_enc, 1);
 222                 lfsr_rollback_word(t, uid ^ nt0, 0);
 223                 crypto1_get_lfsr(t, &key);
 224
 225                 crypto1_word(t, uid ^ nt1, 0);
 226                 crypto1_word(t, nr1_enc, 1);
 227                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
 228                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
 229                         outkey=key;
 230                         ++counter;
 231                         if (counter==20)
 232                                 break;
 233                 }
 234         }
 235         isSuccess       = (counter == 1);
 236         t1 = clock() - t1;
 237         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.0f ticks \nFound %d possible keys", (float)t1,counter);
 238         *outputkey = ( isSuccess ) ? outkey : 0;
 239         crypto1_destroy(s);
 240         /* // un-comment to output all keys to stats.txt
 241         FILE *fout;
 242         if ((fout = fopen("stats.txt","ab")) == NULL) {
 243                 PrintAndLog("Could not create file name stats.txt");
 244                 return 1;
 245         }
 246         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);
 247         fclose(fout);
 248         */
 249         return isSuccess;
 250 }
 251
 252 int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
 253         uint32_t uid    = le32toh(data);
 254         uint32_t nt     = le32toh(data+4);  // tag challenge
 255         uint32_t nr_enc = le32toh(data+8);  // encrypted reader challenge
 256         uint32_t ar_enc = le32toh(data+12); // encrypted reader response
 257         uint32_t at_enc = le32toh(data+16);     // encrypted tag response
 258         return tryMfk64(uid, nt, nr_enc, ar_enc, at_enc, outputkey);
 259 }
 260
 261 int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
 262         uint64_t key    = 0;                            // recovered key
 263         uint32_t ks2;                                           // keystream used to encrypt reader response
 264         uint32_t ks3;                                           // keystream used to encrypt tag response
 265         struct Crypto1State *revstate;
 266
 267         PrintAndLog("Enter mfkey64");
 268         clock_t t1 = clock();
 269
 270         // Extract the keystream from the messages
 271         ks2 = ar_enc ^ prng_successor(nt, 64);
 272         ks3 = at_enc ^ prng_successor(nt, 96);
 273         revstate = lfsr_recovery64(ks2, ks3);
 274         lfsr_rollback_word(revstate, 0, 0);
 275         lfsr_rollback_word(revstate, 0, 0);
 276         lfsr_rollback_word(revstate, nr_enc, 1);
 277         lfsr_rollback_word(revstate, uid ^ nt, 0);
 278         crypto1_get_lfsr(revstate, &key);
 279         PrintAndLog("Found Key: [%012" PRIx64 "]", key);
 280         crypto1_destroy(revstate);
 281         *outputkey = key;
 282
 283         t1 = clock() - t1;
 284         if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.0f ticks \n", (float)t1);
 285         return 0;
 286 }
 287