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

   1 // Test-file: test2.c
   2 #include "crapto1.h"
   3 #include <stdio.h>
   4
   5 int main (int argc, char *argv[]) {
   6   struct Crypto1State *revstate;
   7   uint64_t lfsr;
   8   uint8_t* plfsr = (uint8_t*)&lfsr;
   9   uint32_t uid;     // serial number
  10   uint32_t nt;      // tag challenge
  11   uint32_t nr_enc;  // encrypted reader challenge
  12   uint32_t ar_enc;  // encrypted reader response
  13   uint32_t at_enc;  // encrypted tag response
  14         uint32_t ks2;     // keystream used to encrypt reader response
  15         uint32_t ks3;     // keystream used to encrypt tag response
  16
  17   printf("MIFARE Classic key recovery\n\n");
  18
  19   if (argc < 6) {
  20     printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
  21     return 1;
  22   }
  23
  24   sscanf(argv[1],"%x",&uid);
  25   sscanf(argv[2],"%x",&nt);
  26   sscanf(argv[3],"%x",&nr_enc);
  27   sscanf(argv[4],"%x",&ar_enc);
  28   sscanf(argv[5],"%x",&at_enc);
  29
  30   printf("Recovering key for:\n");
  31   printf("  uid: %08x\n",uid);
  32   printf("   nt: %08x\n",nt);
  33   printf(" {nr}: %08x\n",nr_enc);
  34   printf(" {ar}: %08x\n",ar_enc);
  35   printf(" {at}: %08x\n",at_enc);
  36
  37 /*
  38   uint32_t uid                = 0x9c599b32;
  39   uint32_t tag_challenge      = 0x82a4166c;
  40   uint32_t nr_enc             = 0xa1e458ce;
  41   uint32_t reader_response    = 0x6eea41e0;
  42   uint32_t tag_response       = 0x5cadf439;
  43 */
  44         // Generate lfsr succesors of the tag challenge
  45   printf("\nLFSR succesors of the tag challenge:\n");
  46   printf("  nt': %08x\n",prng_successor(nt, 64));
  47   printf(" nt'': %08x\n",prng_successor(nt, 96));
  48
  49   // Extract the keystream from the messages
  50   printf("\nKeystream used to generate {ar} and {at}:\n");
  51         ks2 = ar_enc ^ prng_successor(nt, 64);
  52   ks3 = at_enc ^ prng_successor(nt, 96);
  53   printf("  ks2: %08x\n",ks2);
  54   printf("  ks3: %08x\n",ks3);
  55
  56   revstate = lfsr_recovery64(ks2, ks3);
  57   lfsr_rollback_word(revstate, 0, 0);
  58   lfsr_rollback_word(revstate, 0, 0);
  59   lfsr_rollback_word(revstate, nr_enc, 1);
  60   lfsr_rollback_word(revstate, uid ^ nt, 0);
  61   crypto1_get_lfsr(revstate, &lfsr);
  62   printf("\nFound Key: [%02x %02x %02x %02x %02x %02x]\n\n",plfsr[5],plfsr[4],plfsr[3],plfsr[2],plfsr[1],plfsr[0]);
  63
  64   return 0;
  65 }