cvs.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 "mifare.h"
  16 #include "crapto1/crapto1.h"
  17
  18
  19 // recover key from 2 different reader responses on same tag challenge
  20 bool mfkey32(nonces_t data, uint64_t *outputkey) {
  21         struct Crypto1State *s,*t;
  22         uint64_t outkey = 0;
  23         uint64_t key = 0;     // recovered key
  24         bool isSuccess = false;
  25         uint8_t counter = 0;
  26
  27         s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
  28
  29         for(t = s; t->odd | t->even; ++t) {
  30                 lfsr_rollback_word(t, 0, 0);
  31                 lfsr_rollback_word(t, data.nr, 1);
  32                 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
  33                 crypto1_get_lfsr(t, &key);
  34                 crypto1_word(t, data.cuid ^ data.nonce, 0);
  35                 crypto1_word(t, data.nr2, 1);
  36                 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
  37                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
  38                         outkey = key;
  39                         counter++;
  40                         if (counter == 20) break;
  41                 }
  42         }
  43         isSuccess = (counter == 1);
  44         *outputkey = ( isSuccess ) ? outkey : 0;
  45         crypto1_destroy(s);
  46         /* //un-comment to save all keys to a stats.txt file
  47         FILE *fout;
  48         if ((fout = fopen("stats.txt","ab")) == NULL) {
  49                 PrintAndLog("Could not create file name stats.txt");
  50                 return 1;
  51         }
  52         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);
  53         fclose(fout);
  54         */
  55         return isSuccess;
  56 }
  57
  58 // recover key from 2 reader responses on 2 different tag challenges
  59 bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
  60         struct Crypto1State *s, *t;
  61         uint64_t outkey  = 0;
  62         uint64_t key       = 0;                 // recovered key
  63         bool isSuccess = false;
  64         int counter = 0;
  65
  66         s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
  67
  68         for(t = s; t->odd | t->even; ++t) {
  69                 lfsr_rollback_word(t, 0, 0);
  70                 lfsr_rollback_word(t, data.nr, 1);
  71                 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
  72                 crypto1_get_lfsr(t, &key);
  73
  74                 crypto1_word(t, data.cuid ^ data.nonce2, 0);
  75                 crypto1_word(t, data.nr2, 1);
  76                 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
  77                         //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
  78                         outkey=key;
  79                         ++counter;
  80                         if (counter==20)
  81                                 break;
  82                 }
  83         }
  84         isSuccess       = (counter == 1);
  85         *outputkey = ( isSuccess ) ? outkey : 0;
  86         crypto1_destroy(s);
  87         /* // un-comment to output all keys to stats.txt
  88         FILE *fout;
  89         if ((fout = fopen("stats.txt","ab")) == NULL) {
  90                 PrintAndLog("Could not create file name stats.txt");
  91                 return 1;
  92         }
  93         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);
  94         fclose(fout);
  95         */
  96         return isSuccess;
  97 }
  98
  99 // recover key from reader response and tag response of one authentication sequence
 100 int mfkey64(nonces_t data, uint64_t *outputkey){
 101         uint64_t key    = 0;                            // recovered key
 102         uint32_t ks2;                                           // keystream used to encrypt reader response
 103         uint32_t ks3;                                           // keystream used to encrypt tag response
 104         struct Crypto1State *revstate;
 105
 106         // Extract the keystream from the messages
 107         ks2 = data.ar ^ prng_successor(data.nonce, 64);
 108         ks3 = data.at ^ prng_successor(data.nonce, 96);
 109         revstate = lfsr_recovery64(ks2, ks3);
 110         lfsr_rollback_word(revstate, 0, 0);
 111         lfsr_rollback_word(revstate, 0, 0);
 112         lfsr_rollback_word(revstate, data.nr, 1);
 113         lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
 114         crypto1_get_lfsr(revstate, &key);
 115         // PrintAndLog("Found Key: [%012" PRIx64 "]", key);
 116         crypto1_destroy(revstate);
 117         *outputkey = key;
 118
 119         return 0;
 120 }
 121
 122