Update README.md

[proxmark3-svn] / tools / mfkey / mfkey32.c

diff --git a/tools/mfkey/mfkey32.c b/tools/mfkey/mfkey32.c
index 0e64a3e8e02b1c56f626432630ffc7e58063358e..43e5a094dab57627c51705cb25b2b776b4321758 100755 (executable)
--- a/tools/mfkey/mfkey32.c
+++ b/tools/mfkey/mfkey32.c
@@ -1,58 +1,60 @@
 #define __STDC_FORMAT_MACROS
 #include <inttypes.h>
-#define llx PRIx64
-#define lli PRIi64
-
-// Test-file: test2.c
 #include "crapto1.h"
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
 
+#define llx PRIx64
+#define lli PRIi64
 int main (int argc, char *argv[]) {
-  struct Crypto1State *s,*t;
-  uint64_t key;     // recovered key
-  uint32_t uid;     // serial number
-  uint32_t nt;      // tag challenge
-  uint32_t nr0_enc; // first encrypted reader challenge
-  uint32_t ar0_enc; // first encrypted reader response
-  uint32_t nr1_enc; // second encrypted reader challenge
-  uint32_t ar1_enc; // second encrypted reader response
-  uint32_t ks2;     // keystream used to encrypt reader response
+       struct Crypto1State *s,*t;
+       uint64_t key;     // recovered key
+       uint32_t uid;     // serial number
+       uint32_t nt;      // tag challenge
+       uint32_t nr0_enc; // first encrypted reader challenge
+       uint32_t ar0_enc; // first encrypted reader response
+       uint32_t nr1_enc; // second encrypted reader challenge
+       uint32_t ar1_enc; // second encrypted reader response
+       uint32_t ks2;     // keystream used to encrypt reader response
 
-  printf("MIFARE Classic key recovery - based 32 bits of keystream\n");
-  printf("Recover key from two 32-bit reader authentication answers only!\n\n");
+       printf("MIFARE Classic key recovery - based 32 bits of keystream\n");
+       printf("Recover key from two 32-bit reader authentication answers only!\n\n");
 
-  if (argc < 7) {
-    printf(" syntax: %s <uid> <nt> <{nr_0}> <{ar_0}> <{nr_1}> <{ar_1}>\n\n",argv[0]);
-    return 1;
-  }
+       if (argc < 7) {
+               printf(" syntax: %s <uid> <nt> <nr_0> <ar_0> <nr_1> <ar_1>\n\n",argv[0]);
+               return 1;
+       }
 
-  sscanf(argv[1],"%x",&uid);
-  sscanf(argv[2],"%x",&nt);
-  sscanf(argv[3],"%x",&nr0_enc);
-  sscanf(argv[4],"%x",&ar0_enc);
-  sscanf(argv[5],"%x",&nr1_enc);
-  sscanf(argv[6],"%x",&ar1_enc);
+       sscanf(argv[1],"%x",&uid);
+       sscanf(argv[2],"%x",&nt);
+       sscanf(argv[3],"%x",&nr0_enc);
+       sscanf(argv[4],"%x",&ar0_enc);
+       sscanf(argv[5],"%x",&nr1_enc);
+       sscanf(argv[6],"%x",&ar1_enc);
 
-  printf("Recovering key for:\n");
-  printf("    uid: %08x\n",uid);
-  printf("     nt: %08x\n",nt);
-  printf(" {nr_0}: %08x\n",nr0_enc);
-  printf(" {ar_0}: %08x\n",ar0_enc);
-  printf(" {nr_1}: %08x\n",nr1_enc);
-  printf(" {ar_1}: %08x\n",ar1_enc);
+       printf("Recovering key for:\n");
+       printf("    uid: %08x\n",uid);
+       printf("     nt: %08x\n",nt);
+       printf(" {nr_0}: %08x\n",nr0_enc);
+       printf(" {ar_0}: %08x\n",ar0_enc);
+       printf(" {nr_1}: %08x\n",nr1_enc);
+       printf(" {ar_1}: %08x\n",ar1_enc);
 
        // Generate lfsr succesors of the tag challenge
-  printf("\nLFSR succesors of the tag challenge:\n");
-  printf("  nt': %08x\n",prng_successor(nt, 64));
-  printf(" nt'': %08x\n",prng_successor(nt, 96));
+       printf("\nLFSR succesors of the tag challenge:\n");
+       uint32_t p64 = prng_successor(nt, 64);
+       printf("  nt': %08x\n", p64);
+       printf(" nt'': %08x\n", prng_successor(p64, 32));
 
-  // Extract the keystream from the messages
-  printf("\nKeystream used to generate {ar} and {at}:\n");
-  ks2 = ar0_enc ^ prng_successor(nt, 64);
-  printf("  ks2: %08x\n",ks2);
+       clock_t t1 = clock();
+               
+       // Extract the keystream from the messages
+       printf("\nKeystream used to generate {ar} and {at}:\n");
+       ks2 = ar0_enc ^ p64;
+       printf("  ks2: %08x\n", ks2);
 
-       s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
+       s = lfsr_recovery32(ar0_enc ^ p64, 0);
   
        for(t = s; t->odd | t->even; ++t) {
                lfsr_rollback_word(t, 0, 0);
@@ -61,12 +63,12 @@ int main (int argc, char *argv[]) {
                crypto1_get_lfsr(t, &key);
                crypto1_word(t, uid ^ nt, 0);
                crypto1_word(t, nr1_enc, 1);
-               if (ar1_enc == (crypto1_word(t, 0, 0) ^ prng_successor(nt, 64))) {
-      printf("\nFound Key: [%012"llx"]\n\n",key);
-                       break;
-               }
+               if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64)) {
+                       printf("\nFound Key: [%012"llx"]\n\n",key);
+                       break;}
        }
-  free(s);
-
-  return 0;
+       free(s);
+       t1 = clock() - t1;
+       if ( t1 > 0 ) printf("Time : %.0f ticks \n", (float)t1);
+       return 0;
 }