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 "nonce2key.h"
  14
  15 #include <inttypes.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include "mifarehost.h"
  19 #include "ui.h"
  20 #include "util.h"
  21 #include "crapto1/crapto1.h"
  22
  23 int compar_state(const void * a, const void * b) {
  24         // didn't work: (the result is truncated to 32 bits)
  25         //return (*(int64_t*)b - *(int64_t*)a);
  26
  27         // better:
  28         if (*(int64_t*)b == *(int64_t*)a) return 0;
  29         else if (*(int64_t*)b > *(int64_t*)a) return 1;
  30         else return -1;
  31 }
  32
  33 int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
  34   struct Crypto1State *state;
  35   uint32_t i, pos, rr, nr_diff, key_count;//, ks1, ks2;
  36   uint8_t bt, ks3x[8], par[8][8];
  37   uint64_t key_recovered;
  38   int64_t *state_s;
  39   static uint32_t last_uid;
  40   static int64_t *last_keylist;
  41   rr = 0;
  42
  43   if (last_uid != uid && last_keylist != NULL)
  44   {
  45         free(last_keylist);
  46         last_keylist = NULL;
  47   }
  48   last_uid = uid;
  49
  50   // Reset the last three significant bits of the reader nonce
  51   nr &= 0xffffff1f;
  52
  53   PrintAndLog("\nuid(%08x) nt(%08x) par(%016" PRIx64") ks(%016" PRIx64") nr(%08" PRIx32")\n\n",uid,nt,par_info,ks_info,nr);
  54
  55   for (pos=0; pos<8; pos++)
  56   {
  57     ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  58     bt = (par_info >> (pos*8)) & 0xff;
  59     for (i=0; i<8; i++)
  60     {
  61       par[7-pos][i] = (bt >> i) & 0x01;
  62     }
  63   }
  64
  65   printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
  66   printf("+----+--------+---+-----+---------------+\n");
  67   for (i=0; i<8; i++)
  68   {
  69     nr_diff = nr | i << 5;
  70     printf("| %02x |%08x|",i << 5, nr_diff);
  71     printf(" %01x |  %01x  |",ks3x[i], ks3x[i]^5);
  72     for (pos=0; pos<7; pos++) printf("%01x,", par[i][pos]);
  73     printf("%01x|\n", par[i][7]);
  74   }
  75
  76         if (par_info == 0)
  77                 PrintAndLog("Parity is all zero, trying special attack! Just wait for few more seconds...");
  78
  79         state = lfsr_common_prefix(nr, rr, ks3x, par);
  80         state_s = (int64_t*)state;
  81
  82         //char filename[50] ;
  83     //sprintf(filename, "nt_%08x_%d.txt", nt, nr);
  84     //printf("name %s\n", filename);
  85         //FILE* fp = fopen(filename,"w");
  86         for (i = 0; (state) && *(state_s + i); i++)
  87         {
  88                 lfsr_rollback_word(state+i, uid^nt, 0);
  89                 crypto1_get_lfsr(state + i, &key_recovered);
  90                 *(state_s + i) = key_recovered;
  91                 //fprintf(fp, "%012" PRIx64 "\n",key_recovered);
  92         }
  93         //fclose(fp);
  94
  95         if(!state)
  96                 return 1;
  97
  98         qsort(state_s, i, sizeof(*state_s), compar_state);
  99         *(state_s + i) = -1;
 100
 101         //Create the intersection:
 102         if (par_info == 0 ) {
 103                 if (last_keylist != NULL) {
 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                 } else {
 120                         key_count = 0;
 121                 }
 122         } else {
 123                 last_keylist = state_s;
 124                 key_count = i;
 125         }
 126
 127         printf("key_count:%d\n", key_count);
 128
 129         // The list may still contain several key candidates. Test each of them with mfCheckKeys
 130         for (i = 0; i < key_count; i++) {
 131                 uint8_t keyBlock[6];
 132                 uint64_t key64;
 133                 key64 = *(last_keylist + i);
 134                 num_to_bytes(key64, 6, keyBlock);
 135                 key64 = 0;
 136                 if (!mfCheckKeys(0, 0, false, 1, keyBlock, &key64)) {
 137                         *key = key64;
 138                         free(last_keylist);
 139                         last_keylist = NULL;
 140                         if (par_info == 0)
 141                                 free(state);
 142                         return 0;
 143                 }
 144         }
 145
 146
 147         free(last_keylist);
 148         last_keylist = state_s;
 149
 150         return 1;
 151 }
 152
 153 // 32 bit recover key from 2 nonces
 154 bool mfkey32(nonces_t data, uint64_t *outputkey) {
 155         struct Crypto1State *s,*t;
 156         uint64_t outkey = 0;
 157         uint64_t key=0;     // recovered key
 158         uint32_t uid     = data.cuid;
 159         uint32_t nt      = data.nonce;  // first tag challenge (nonce)
 160         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 161         uint32_t ar0_enc = data.ar;  // first encrypted reader response
 162         uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
 163         uint32_t ar1_enc = data.ar2; // second encrypted reader response
 164         uint64_t t1 = msclock();
 165         bool isSuccess = false;
 166         uint8_t counter=0;
 167
 168         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
 169
 170         for(t = s; t->odd | t->even; ++t) {
 171                 lfsr_rollback_word(t, 0, 0);
 172                 lfsr_rollback_word(t, nr0_enc, 1);
 173                 lfsr_rollback_word(t, uid ^ nt, 0);
 174                 crypto1_get_lfsr(t, &key);
 175                 crypto1_word(t, uid ^ nt, 0);
 176                 crypto1_word(t, nr1_enc, 1);
 177                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
 178                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
 179                         outkey = key;
 180                         counter++;
 181                         if (counter==20) break;
 182                 }
 183         }
 184         isSuccess = (counter == 1);
 185         t1 = msclock() - t1;
 186         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
 187         *outputkey = ( isSuccess ) ? outkey : 0;
 188         crypto1_destroy(s);
 189         /* //un-comment to save all keys to a stats.txt file
 190         FILE *fout;
 191         if ((fout = fopen("stats.txt","ab")) == NULL) {
 192                 PrintAndLog("Could not create file name stats.txt");
 193                 return 1;
 194         }
 195         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);
 196         fclose(fout);
 197         */
 198         return isSuccess;
 199 }
 200
 201 bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey) {
 202         struct Crypto1State *s, *t;
 203         uint64_t outkey  = 0;
 204         uint64_t key       = 0;                      // recovered key
 205         uint32_t uid     = data.cuid;
 206         uint32_t nt0     = data.nonce;  // first tag challenge (nonce)
 207         uint32_t nr0_enc = data.nr;  // first encrypted reader challenge
 208         uint32_t ar0_enc = data.ar; // first encrypted reader response
 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         uint64_t t1 = msclock();
 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" PRIx64 "]",key);
 230                         outkey=key;
 231                         ++counter;
 232                         if (counter==20)
 233                                 break;
 234                 }
 235         }
 236         isSuccess       = (counter == 1);
 237         t1 = msclock() - t1;
 238         //if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.1f seconds \nFound %d possible keys", (float)t1/1000.0, counter);
 239         *outputkey = ( isSuccess ) ? outkey : 0;
 240         crypto1_destroy(s);
 241         /* // un-comment to output all keys to stats.txt
 242         FILE *fout;
 243         if ((fout = fopen("stats.txt","ab")) == NULL) {
 244                 PrintAndLog("Could not create file name stats.txt");
 245                 return 1;
 246         }
 247         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);
 248         fclose(fout);
 249         */
 250         return isSuccess;
 251 }
 252
 253 int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
 254         uint32_t uid    = le32toh(data);
 255         uint32_t nt     = le32toh(data+4);  // tag challenge
 256         uint32_t nr_enc = le32toh(data+8);  // encrypted reader challenge
 257         uint32_t ar_enc = le32toh(data+12); // encrypted reader response
 258         uint32_t at_enc = le32toh(data+16);     // encrypted tag response
 259         return tryMfk64(uid, nt, nr_enc, ar_enc, at_enc, outputkey);
 260 }
 261
 262 int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
 263         uint64_t key    = 0;                            // recovered key
 264         uint32_t ks2;                                           // keystream used to encrypt reader response
 265         uint32_t ks3;                                           // keystream used to encrypt tag response
 266         struct Crypto1State *revstate;
 267
 268         PrintAndLog("Enter mfkey64");
 269         uint64_t t1 = msclock();
 270
 271         // Extract the keystream from the messages
 272         ks2 = ar_enc ^ prng_successor(nt, 64);
 273         ks3 = at_enc ^ prng_successor(nt, 96);
 274         revstate = lfsr_recovery64(ks2, ks3);
 275         lfsr_rollback_word(revstate, 0, 0);
 276         lfsr_rollback_word(revstate, 0, 0);
 277         lfsr_rollback_word(revstate, nr_enc, 1);
 278         lfsr_rollback_word(revstate, uid ^ nt, 0);
 279         crypto1_get_lfsr(revstate, &key);
 280         PrintAndLog("Found Key: [%012" PRIx64 "]", key);
 281         crypto1_destroy(revstate);
 282         *outputkey = key;
 283
 284         t1 = msclock() - t1;
 285         if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.1f seconds \n", (float)t1/1000.0);
 286         return 0;
 287 }
 288