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
  20         struct Crypto1State *state;
  21         uint32_t i, pos, rr = 0, nr_diff;
  22         byte_t bt, ks3x[8], par[8][8];
  23
  24         // Reset the last three significant bits of the reader nonce
  25         nr &= 0xffffff1f;
  26
  27         PrintAndLog("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08"llx")\n\n", uid, nt, par_info, ks_info, nr);
  28
  29         for ( pos = 0; pos < 8; pos++ ) {
  30                 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  31                 bt = (par_info >> (pos*8)) & 0xff;
  32
  33                 for ( i = 0; i < 8; i++) {
  34                         par[7-pos][i] = (bt >> i) & 0x01;
  35                 }
  36         }
  37
  38         printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
  39         printf("+----+--------+---+-----+---------------+\n");
  40
  41         for ( i = 0; i < 8; i++) {
  42                 nr_diff = nr | i << 5;
  43                 printf("| %02x |%08x| %01x |  %01x  |", i << 5, nr_diff, ks3x[i], ks3x[i]^5);
  44
  45                 for (pos = 0; pos < 7; pos++) printf("%01x,", par[i][pos]);
  46                 printf("%01x|\n", par[i][7]);
  47         }
  48         printf("+----+--------+---+-----+---------------+\n");
  49
  50         clock_t t1 = clock();
  51
  52         state = lfsr_common_prefix(nr, rr, ks3x, par);
  53         lfsr_rollback_word(state, uid^nt, 0);
  54         crypto1_get_lfsr(state, key);
  55         crypto1_destroy(state);
  56
  57         t1 = clock() - t1;
  58         if ( t1 > 0 ) PrintAndLog("Time in nonce2key: %.0f ticks \n", (float)t1);
  59         return 0;
  60 }
  61
  62 // *outputkey is not used...
  63 int tryMfk32(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
  64
  65         struct Crypto1State *s,*t;
  66         uint64_t key;     // recovered key
  67         uint32_t uid;     // serial number
  68         uint32_t nt;      // tag challenge
  69         uint32_t nr0_enc; // first encrypted reader challenge
  70         uint32_t ar0_enc; // first encrypted reader response
  71         uint32_t nr1_enc; // second encrypted reader challenge
  72         uint32_t ar1_enc; // second encrypted reader response
  73         bool isSuccess = FALSE;
  74         int counter = 0;
  75
  76         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
  77         nt              = *(uint32_t*)(data+8);
  78         nr0_enc = *(uint32_t*)(data+12);
  79         ar0_enc = *(uint32_t*)(data+16);
  80         nr1_enc = *(uint32_t*)(data+32);
  81         ar1_enc = *(uint32_t*)(data+36);
  82
  83         // PrintAndLog("recovering key for:");
  84         // PrintAndLog("    uid: %08x   %08x",uid, myuid);
  85         // PrintAndLog("     nt: %08x",nt);
  86         // PrintAndLog(" {nr_0}: %08x",nr0_enc);
  87         // PrintAndLog(" {ar_0}: %08x",ar0_enc);
  88         // PrintAndLog(" {nr_1}: %08x",nr1_enc);
  89         // PrintAndLog(" {ar_1}: %08x",ar1_enc);
  90
  91         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
  92
  93         for(t = s; t->odd | t->even; ++t) {
  94                 lfsr_rollback_word(t, 0, 0);
  95                 lfsr_rollback_word(t, nr0_enc, 1);
  96                 lfsr_rollback_word(t, uid ^ nt, 0);
  97                 crypto1_get_lfsr(t, &key);
  98                 crypto1_word(t, uid ^ nt, 0);
  99                 crypto1_word(t, nr1_enc, 1);
 100                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
 101                         PrintAndLog("Found Key: [%012"llx"]", key);
 102                         isSuccess = TRUE;
 103                         ++counter;
 104                         if (counter==20)
 105                                 break;
 106                 }
 107         }
 108
 109         num_to_bytes(key, 6, outputkey);
 110         crypto1_destroy(t);
 111         return isSuccess;
 112 }
 113
 114 int tryMfk32_moebius(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
 115
 116         struct Crypto1State *s, *t;
 117         uint64_t key;     // recovered key
 118         uint32_t uid;     // serial number
 119         uint32_t nt0;     // tag challenge first
 120         uint32_t nt1;     // tag challenge second
 121         uint32_t nr0_enc; // first encrypted reader challenge
 122         uint32_t ar0_enc; // first encrypted reader response
 123         uint32_t nr1_enc; // second encrypted reader challenge
 124         uint32_t ar1_enc; // second encrypted reader response
 125         bool isSuccess = FALSE;
 126         int counter = 0;
 127
 128         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
 129         nt0     = *(uint32_t*)(data+8);
 130         nr0_enc = *(uint32_t*)(data+12);
 131         ar0_enc = *(uint32_t*)(data+16);
 132         nt1     = *(uint32_t*)(data+8);
 133         nr1_enc = *(uint32_t*)(data+32);
 134         ar1_enc = *(uint32_t*)(data+36);
 135
 136         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
 137
 138         for(t = s; t->odd | t->even; ++t) {
 139                 lfsr_rollback_word(t, 0, 0);
 140                 lfsr_rollback_word(t, nr0_enc, 1);
 141                 lfsr_rollback_word(t, uid ^ nt0, 0);
 142                 crypto1_get_lfsr(t, &key);
 143
 144                 crypto1_word(t, uid ^ nt1, 0);
 145                 crypto1_word(t, nr1_enc, 1);
 146                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
 147                         PrintAndLog("Found Key: [%012"llx"]",key);
 148                         isSuccess = TRUE;
 149                         ++counter;
 150                         if (counter==20)
 151                                 break;
 152                 }
 153         }
 154         num_to_bytes(key, 6, outputkey);
 155         crypto1_destroy(t);
 156         return isSuccess;
 157 }
 158
 159 int tryMfk64(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
 160
 161         struct Crypto1State *revstate;
 162         uint64_t key;     // recovered key
 163         uint32_t uid;     // serial number
 164         uint32_t nt;      // tag challenge
 165         uint32_t nr_enc;  // encrypted reader challenge
 166         uint32_t ar_enc;  // encrypted reader response
 167         uint32_t at_enc;  // encrypted tag response
 168         uint32_t ks2;     // keystream used to encrypt reader response
 169         uint32_t ks3;     // keystream used to encrypt tag response
 170
 171         struct Crypto1State mpcs = {0, 0};
 172         struct Crypto1State *pcs;
 173         pcs = &mpcs;
 174
 175         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
 176         nt      = *(uint32_t*)(data+8);
 177         nr_enc  = *(uint32_t*)(data+12);
 178         ar_enc  = *(uint32_t*)(data+16);
 179
 180         crypto1_word(pcs, nr_enc , 1);
 181         at_enc = prng_successor(nt, 96) ^ crypto1_word(pcs, 0, 0);
 182
 183         // printf("Recovering key for:\n");
 184         // printf("  uid: %08x\n",uid);
 185         // printf("   nt: %08x\n",nt);
 186         // printf(" {nr}: %08x\n",nr_enc);
 187         // printf(" {ar}: %08x\n",ar_enc);
 188         // printf(" {at}: %08x\n",at_enc);
 189
 190         // Extract the keystream from the messages
 191         ks2 = ar_enc ^ prng_successor(nt, 64);
 192         ks3 = at_enc ^ prng_successor(nt, 96);
 193
 194         revstate = lfsr_recovery64(ks2, ks3);
 195         lfsr_rollback_word(revstate, 0, 0);
 196         lfsr_rollback_word(revstate, 0, 0);
 197         lfsr_rollback_word(revstate, nr_enc, 1);
 198         lfsr_rollback_word(revstate, uid ^ nt, 0);
 199         crypto1_get_lfsr(revstate, &key);
 200         PrintAndLog("Found Key: [%012"llx"]",key);
 201         num_to_bytes(key, 6, outputkey);
 202         crypto1_destroy(revstate);
 203         return 0;
 204 }