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 compar_state(const void * a, const void * b) {
  18         // didn't work: (the result is truncated to 32 bits)
  19         //return (*(int64_t*)b - *(int64_t*)a);
  20
  21         // better:
  22         if (*(int64_t*)b == *(int64_t*)a) return 0;
  23         else if (*(int64_t*)b > *(int64_t*)a) return 1;
  24         else return -1;
  25 }
  26
  27 int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
  28
  29         struct Crypto1State *state;
  30         uint32_t i, pos, rr = 0, nr_diff;
  31         byte_t bt, ks3x[8], par[8][8];
  32
  33         // Reset the last three significant bits of the reader nonce
  34         nr &= 0xffffff1f;
  35
  36         PrintAndLog("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08"llx")\n\n", uid, nt, par_info, ks_info, nr);
  37
  38         for ( pos = 0; pos < 8; pos++ ) {
  39                 ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
  40                 bt = (par_info >> (pos*8)) & 0xff;
  41
  42                 for ( i = 0; i < 8; i++) {
  43                         par[7-pos][i] = (bt >> i) & 0x01;
  44                 }
  45         }
  46
  47         printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
  48         printf("+----+--------+---+-----+---------------+\n");
  49
  50         for ( i = 0; i < 8; i++) {
  51                 nr_diff = nr | i << 5;
  52                 printf("| %02x |%08x|", i << 5, nr_diff);
  53                 printf(" %01x |  %01x  |", ks3x[i], ks3x[i]^5);
  54                 for (pos = 0; pos < 7; pos++) printf("%01x,", par[i][pos]);
  55                 printf("%01x|\n", par[i][7]);
  56         }
  57         printf("+----+--------+---+-----+---------------+\n");
  58
  59         state = lfsr_common_prefix(nr, rr, ks3x, par);
  60         lfsr_rollback_word(state, uid^nt, 0);
  61         crypto1_get_lfsr(state, key);
  62     printf("\nkey recovered: %012"llx"\n\n",key);
  63         crypto1_destroy(state);
  64         return 0;
  65 }
  66
  67 // *outputkey is not used...
  68 int tryMfk32(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
  69
  70         struct Crypto1State *s,*t;
  71         uint64_t key;     // recovered key
  72         uint32_t uid;     // serial number
  73         uint32_t nt;      // tag challenge
  74         uint32_t nr0_enc; // first encrypted reader challenge
  75         uint32_t ar0_enc; // first encrypted reader response
  76         uint32_t nr1_enc; // second encrypted reader challenge
  77         uint32_t ar1_enc; // second encrypted reader response
  78         bool isSuccess = FALSE;
  79         int counter = 0;
  80
  81         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
  82         nt              = *(uint32_t*)(data+8);
  83         nr0_enc = *(uint32_t*)(data+12);
  84         ar0_enc = *(uint32_t*)(data+16);
  85         nr1_enc = *(uint32_t*)(data+32);
  86         ar1_enc = *(uint32_t*)(data+36);
  87
  88         // PrintAndLog("recovering key for:");
  89         // PrintAndLog("    uid: %08x   %08x",uid, myuid);
  90         // PrintAndLog("     nt: %08x",nt);
  91         // PrintAndLog(" {nr_0}: %08x",nr0_enc);
  92         // PrintAndLog(" {ar_0}: %08x",ar0_enc);
  93         // PrintAndLog(" {nr_1}: %08x",nr1_enc);
  94         // PrintAndLog(" {ar_1}: %08x",ar1_enc);
  95
  96         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
  97
  98         for(t = s; t->odd | t->even; ++t) {
  99                 lfsr_rollback_word(t, 0, 0);
 100                 lfsr_rollback_word(t, nr0_enc, 1);
 101                 lfsr_rollback_word(t, uid ^ nt, 0);
 102                 crypto1_get_lfsr(t, &key);
 103                 crypto1_word(t, uid ^ nt, 0);
 104                 crypto1_word(t, nr1_enc, 1);
 105                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
 106                         PrintAndLog("Found Key: [%012"llx"]", key);
 107                         isSuccess = TRUE;
 108                         ++counter;
 109                         if (counter==20)
 110                                 break;
 111                 }
 112         }
 113
 114         num_to_bytes(key, 6, outputkey);
 115         crypto1_destroy(t);
 116         return isSuccess;
 117 }
 118
 119 int tryMfk32_moebius(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
 120
 121         struct Crypto1State *s, *t;
 122         uint64_t key;     // recovered key
 123         uint32_t uid;     // serial number
 124         uint32_t nt0;     // tag challenge first
 125         uint32_t nt1;     // tag challenge second
 126         uint32_t nr0_enc; // first encrypted reader challenge
 127         uint32_t ar0_enc; // first encrypted reader response
 128         uint32_t nr1_enc; // second encrypted reader challenge
 129         uint32_t ar1_enc; // second encrypted reader response
 130         bool isSuccess = FALSE;
 131         int counter = 0;
 132
 133         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
 134         nt0     = *(uint32_t*)(data+8);
 135         nr0_enc = *(uint32_t*)(data+12);
 136         ar0_enc = *(uint32_t*)(data+16);
 137         nt1     = *(uint32_t*)(data+8);
 138         nr1_enc = *(uint32_t*)(data+32);
 139         ar1_enc = *(uint32_t*)(data+36);
 140
 141         s = lfsr_recovery32(ar0_enc ^ prng_successor(nt0, 64), 0);
 142
 143         for(t = s; t->odd | t->even; ++t) {
 144                 lfsr_rollback_word(t, 0, 0);
 145                 lfsr_rollback_word(t, nr0_enc, 1);
 146                 lfsr_rollback_word(t, uid ^ nt0, 0);
 147                 crypto1_get_lfsr(t, &key);
 148
 149                 crypto1_word(t, uid ^ nt1, 0);
 150                 crypto1_word(t, nr1_enc, 1);
 151                 if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt1, 64))) {
 152                         PrintAndLog("Found Key: [%012"llx"]",key);
 153                         isSuccess = TRUE;
 154                         ++counter;
 155                         if (counter==20)
 156                                 break;
 157                 }
 158         }
 159         num_to_bytes(key, 6, outputkey);
 160         crypto1_destroy(t);
 161         return isSuccess;
 162 }
 163
 164 int tryMfk64(uint64_t myuid, uint8_t *data, uint8_t *outputkey ){
 165
 166         struct Crypto1State *revstate;
 167         uint64_t key;     // recovered key
 168         uint32_t uid;     // serial number
 169         uint32_t nt;      // tag challenge
 170         uint32_t nr_enc;  // encrypted reader challenge
 171         uint32_t ar_enc;  // encrypted reader response
 172         uint32_t at_enc;  // encrypted tag response
 173         uint32_t ks2;     // keystream used to encrypt reader response
 174         uint32_t ks3;     // keystream used to encrypt tag response
 175
 176         struct Crypto1State mpcs = {0, 0};
 177         struct Crypto1State *pcs;
 178         pcs = &mpcs;
 179
 180         uid     = myuid;//(uint32_t)bytes_to_num(data +  0, 4);
 181         nt              = *(uint32_t*)(data+8);
 182         nr_enc = *(uint32_t*)(data+12);
 183         ar_enc = *(uint32_t*)(data+16);
 184
 185         crypto1_word(pcs, nr_enc , 1);
 186         at_enc = prng_successor(nt, 96) ^ crypto1_word(pcs, 0, 0);
 187
 188         // printf("Recovering key for:\n");
 189         // printf("  uid: %08x\n",uid);
 190         // printf("   nt: %08x\n",nt);
 191         // printf(" {nr}: %08x\n",nr_enc);
 192         // printf(" {ar}: %08x\n",ar_enc);
 193         // printf(" {at}: %08x\n",at_enc);
 194
 195         // Extract the keystream from the messages
 196         ks2 = ar_enc ^ prng_successor(nt, 64);
 197         ks3 = at_enc ^ prng_successor(nt, 96);
 198
 199         revstate = lfsr_recovery64(ks2, ks3);
 200         lfsr_rollback_word(revstate, 0, 0);
 201         lfsr_rollback_word(revstate, 0, 0);
 202         lfsr_rollback_word(revstate, nr_enc, 1);
 203         lfsr_rollback_word(revstate, uid ^ nt, 0);
 204         crypto1_get_lfsr(revstate, &key);
 205         PrintAndLog("Found Key: [%012"llx"]",key);
 206         num_to_bytes(key, 6, outputkey);
 207         crypto1_destroy(revstate);
 208         return 0;
 209 }