git.zerfleddert.de Git - proxmark3-svn/blob - client/mfkey.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 "mfkey.h"
  14
  15 #include "crapto1/crapto1.h"
  16
  17
  18 // recover key from 2 different reader responses on same tag challenge
  19 bool mfkey32(nonces_t data, uint64_t *outputkey) {
  20         struct Crypto1State *s,*t;
  21         uint64_t outkey = 0;
  22         uint64_t key = 0;     // recovered key
  23         bool isSuccess = false;
  24         uint8_t counter = 0;
  25
  26         s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
  27
  28         for(t = s; t->odd | t->even; ++t) {
  29                 lfsr_rollback_word(t, 0, 0);
  30                 lfsr_rollback_word(t, data.nr, 1);
  31                 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
  32                 crypto1_get_lfsr(t, &key);
  33                 crypto1_word(t, data.cuid ^ data.nonce, 0);
  34                 crypto1_word(t, data.nr2, 1);
  35                 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
  36                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
  37                         outkey = key;
  38                         counter++;
  39                         if (counter == 20) break;
  40                 }
  41         }
  42         isSuccess = (counter == 1);
  43         *outputkey = ( isSuccess ) ? outkey : 0;
  44         crypto1_destroy(s);
  45         /* //un-comment to save all keys to a stats.txt file
  46         FILE *fout;
  47         if ((fout = fopen("stats.txt","ab")) == NULL) {
  48                 PrintAndLog("Could not create file name stats.txt");
  49                 return 1;
  50         }
  51         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);
  52         fclose(fout);
  53         */
  54         return isSuccess;
  55 }
  56
  57 // recover key from 2 reader responses on 2 different tag challenges
  58 bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
  59         struct Crypto1State *s, *t;
  60         uint64_t outkey  = 0;
  61         uint64_t key       = 0;                 // recovered key
  62         bool isSuccess = false;
  63         int counter = 0;
  64
  65         s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
  66
  67         for(t = s; t->odd | t->even; ++t) {
  68                 lfsr_rollback_word(t, 0, 0);
  69                 lfsr_rollback_word(t, data.nr, 1);
  70                 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
  71                 crypto1_get_lfsr(t, &key);
  72
  73                 crypto1_word(t, data.cuid ^ data.nonce2, 0);
  74                 crypto1_word(t, data.nr2, 1);
  75                 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
  76                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
  77                         outkey=key;
  78                         ++counter;
  79                         if (counter==20)
  80                                 break;
  81                 }
  82         }
  83         isSuccess       = (counter == 1);
  84         *outputkey = ( isSuccess ) ? outkey : 0;
  85         crypto1_destroy(s);
  86         /* // un-comment to output all keys to stats.txt
  87         FILE *fout;
  88         if ((fout = fopen("stats.txt","ab")) == NULL) {
  89                 PrintAndLog("Could not create file name stats.txt");
  90                 return 1;
  91         }
  92         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);
  93         fclose(fout);
  94         */
  95         return isSuccess;
  96 }
  97
  98 // recover key from reader response and tag response of one authentication sequence
  99 int mfkey64(nonces_t data, uint64_t *outputkey){
 100         uint64_t key    = 0;                            // recovered key
 101         uint32_t ks2;                                           // keystream used to encrypt reader response
 102         uint32_t ks3;                                           // keystream used to encrypt tag response
 103         struct Crypto1State *revstate;
 104
 105         // Extract the keystream from the messages
 106         ks2 = data.ar ^ prng_successor(data.nonce, 64);
 107         ks3 = data.at ^ prng_successor(data.nonce, 96);
 108         revstate = lfsr_recovery64(ks2, ks3);
 109         lfsr_rollback_word(revstate, 0, 0);
 110         lfsr_rollback_word(revstate, 0, 0);
 111         lfsr_rollback_word(revstate, data.nr, 1);
 112         lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
 113         crypto1_get_lfsr(revstate, &key);
 114         // PrintAndLog("Found Key: [%012" PRIx64 "]", key);
 115         crypto1_destroy(revstate);
 116         *outputkey = key;
 117
 118         return 0;
 119 }
 120
 121