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 #include "nonce2key.h"
  13 #include "mifarehost.h"
  14 #include "ui.h"
  15 #include "proxmark3.h"
  16
  17 int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
  18
  19         struct Crypto1State *state;
  20         uint32_t i, pos, rr = 0, nr_diff;
  21         byte_t bt, ks3x[8], par[8][8];
  22
  23         // Reset the last three significant bits of the reader nonce
  24         nr &= 0xffffff1f;
  25
  26         PrintAndLog("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08"llx")\n\n", uid, nt, par_info, ks_info, nr);
  27
  28         for ( pos = 0; pos < 8; pos++ ) {
  29                 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  30                 bt = (par_info >> (pos*8)) & 0xff;
  31
  32                 for ( i = 0; i < 8; i++) {
  33                         par[7-pos][i] = (bt >> i) & 0x01;
  34                 }
  35         }
  36
  37         printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
  38         printf("+----+--------+---+-----+---------------+\n");
  39
  40         for ( i = 0; i < 8; i++) {
  41                 nr_diff = nr | i << 5;
  42                 printf("| %02x |%08x|", i << 5, nr_diff);
  43                 printf(" %01x |  %01x  |", ks3x[i], ks3x[i]^5);
  44                 for (pos = 0; pos < 7; pos++) printf("%01x,", par[i][pos]);
  45                 printf("%01x|\n", par[i][7]);
  46         }
  47         printf("+----+--------+---+-----+---------------+\n");
  48
  49         state = lfsr_common_prefix(nr, rr, ks3x, par);
  50         lfsr_rollback_word(state, uid^nt, 0);
  51         crypto1_get_lfsr(state, key);
  52         crypto1_destroy(state);
  53         return 0;
  54 }
  55
  56 // *outputkey is not used...
  57 int tryMfk32(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
  58
  59         struct Crypto1State *s,*t;
  60         uint64_t key;     // recovered key
  61         uint32_t uid;     // serial number
  62         uint32_t nt;      // tag challenge
  63         uint32_t nr0_enc; // first encrypted reader challenge
  64         uint32_t ar0_enc; // first encrypted reader response
  65         uint32_t nr1_enc; // second encrypted reader challenge
  66         uint32_t ar1_enc; // second encrypted reader response
  67         bool isSuccess = FALSE;
  68         int counter = 0;
  69
  70         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
  71         nt              = *(uint32_t*)(data+8);
  72         nr0_enc = *(uint32_t*)(data+12);
  73         ar0_enc = *(uint32_t*)(data+16);
  74         nr1_enc = *(uint32_t*)(data+32);
  75         ar1_enc = *(uint32_t*)(data+36);
  76
  77         // PrintAndLog("recovering key for:");
  78         // PrintAndLog("    uid: %08x   %08x",uid, myuid);
  79         // PrintAndLog("     nt: %08x",nt);
  80         // PrintAndLog(" {nr_0}: %08x",nr0_enc);
  81         // PrintAndLog(" {ar_0}: %08x",ar0_enc);
  82         // PrintAndLog(" {nr_1}: %08x",nr1_enc);
  83         // PrintAndLog(" {ar_1}: %08x",ar1_enc);
  84
  85         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
  86
  87         for(t = s; t->odd | t->even; ++t) {
  88                 lfsr_rollback_word(t, 0, 0);
  89                 lfsr_rollback_word(t, nr0_enc, 1);
  90                 lfsr_rollback_word(t, uid ^ nt, 0);
  91                 crypto1_get_lfsr(t, &key);
  92                 crypto1_word(t, uid ^ nt, 0);
  93                 crypto1_word(t, nr1_enc, 1);
  94                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
  95                         PrintAndLog("Found Key: [%012"llx"]", key);
  96                         isSuccess = TRUE;
  97                         ++counter;
  98                         if (counter==20)
  99                                 break;
 100                 }
 101         }
 102
 103         num_to_bytes(key, 6, outputkey);
 104         crypto1_destroy(t);
 105         return isSuccess;
 106 }
 107
 108 int tryMfk32_moebius(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
 109
 110         struct Crypto1State *s, *t;
 111         uint64_t key;     // recovered key
 112         uint32_t uid;     // serial number
 113         uint32_t nt0;     // tag challenge first
 114         uint32_t nt1;     // tag challenge second
 115         uint32_t nr0_enc; // first encrypted reader challenge
 116         uint32_t ar0_enc; // first encrypted reader response
 117         uint32_t nr1_enc; // second encrypted reader challenge
 118         uint32_t ar1_enc; // second encrypted reader response
 119         bool isSuccess = FALSE;
 120         int counter = 0;
 121
 122         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
 123         nt0     = *(uint32_t*)(data+8);
 124         nr0_enc = *(uint32_t*)(data+12);
 125         ar0_enc = *(uint32_t*)(data+16);
 126         nt1     = *(uint32_t*)(data+8);
 127         nr1_enc = *(uint32_t*)(data+32);
 128         ar1_enc = *(uint32_t*)(data+36);
 129
 130         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
 131
 132         for(t = s; t->odd | t->even; ++t) {
 133                 lfsr_rollback_word(t, 0, 0);
 134                 lfsr_rollback_word(t, nr0_enc, 1);
 135                 lfsr_rollback_word(t, uid ^ nt0, 0);
 136                 crypto1_get_lfsr(t, &key);
 137
 138                 crypto1_word(t, uid ^ nt1, 0);
 139                 crypto1_word(t, nr1_enc, 1);
 140                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
 141                         PrintAndLog("Found Key: [%012"llx"]",key);
 142                         isSuccess = TRUE;
 143                         ++counter;
 144                         if (counter==20)
 145                                 break;
 146                 }
 147         }
 148         num_to_bytes(key, 6, outputkey);
 149         crypto1_destroy(t);
 150         return isSuccess;
 151 }
 152
 153 int tryMfk64(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
 154
 155         struct Crypto1State *revstate;
 156         uint64_t key;     // recovered key
 157         uint32_t uid;     // serial number
 158         uint32_t nt;      // tag challenge
 159         uint32_t nr_enc;  // encrypted reader challenge
 160         uint32_t ar_enc;  // encrypted reader response
 161         uint32_t at_enc;  // encrypted tag response
 162         uint32_t ks2;     // keystream used to encrypt reader response
 163         uint32_t ks3;     // keystream used to encrypt tag response
 164
 165         struct Crypto1State mpcs = {0, 0};
 166         struct Crypto1State *pcs;
 167         pcs = &mpcs;
 168
 169         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
 170         nt              = *(uint32_t*)(data+8);
 171         nr_enc = *(uint32_t*)(data+12);
 172         ar_enc = *(uint32_t*)(data+16);
 173
 174         crypto1_word(pcs, nr_enc , 1);
 175         at_enc = prng_successor(nt, 96) ^ crypto1_word(pcs, 0, 0);
 176
 177         // printf("Recovering key for:\n");
 178         // printf("  uid: %08x\n",uid);
 179         // printf("   nt: %08x\n",nt);
 180         // printf(" {nr}: %08x\n",nr_enc);
 181         // printf(" {ar}: %08x\n",ar_enc);
 182         // printf(" {at}: %08x\n",at_enc);
 183
 184         // Extract the keystream from the messages
 185         ks2 = ar_enc ^ prng_successor(nt, 64);
 186         ks3 = at_enc ^ prng_successor(nt, 96);
 187
 188         revstate = lfsr_recovery64(ks2, ks3);
 189         lfsr_rollback_word(revstate, 0, 0);
 190         lfsr_rollback_word(revstate, 0, 0);
 191         lfsr_rollback_word(revstate, nr_enc, 1);
 192         lfsr_rollback_word(revstate, uid ^ nt, 0);
 193         crypto1_get_lfsr(revstate, &key);
 194         PrintAndLog("Found Key: [%012"llx"]",key);
 195         num_to_bytes(key, 6, outputkey);
 196         crypto1_destroy(revstate);
 197         return 0;
 198 }