fix #532. looks at length of parameters.

[proxmark3-svn] / tools / mfkey / mfkey64.c

diff --git a/tools/mfkey/mfkey64.c b/tools/mfkey/mfkey64.c
index 448cb2accfe33c174845bca0dcd105eb2eb2665e..8bf1d80134a6f2bea54ee4635f00a71233c0d20e 100755 (executable)
--- a/tools/mfkey/mfkey64.c
+++ b/tools/mfkey/mfkey64.c
@@ -1,71 +1,101 @@
-#define __STDC_FORMAT_MACROS
+#include <stdio.h>
+#include <string.h>

 #include <inttypes.h>
 #include <inttypes.h>

-#define llx PRIx64
-#define lli PRIi64
+#include "crapto1/crapto1.h"
+#include "util_posix.h"

 
 

-// Test-file: test2.c
-#include "crapto1.h"
-#include <stdio.h>
+int main (int argc, char *argv[]) 
+{
+       uint32_t uid;     // serial numDber
+       uint32_t nt;      // tag challenge
+       uint32_t nr_enc;  // encrypted reader challenge
+       uint32_t ar_enc;  // encrypted reader response
+       uint32_t at_enc;  // encrypted tag response
+       uint64_t key    = 0;                            // recovered key
+       struct Crypto1State *revstate;
+       uint32_t ks2;                                           // keystream used to encrypt reader response
+       uint32_t ks3;                                           // keystream used to encrypt tag response
+
+       printf("MIFARE Classic key recovery - based on 64 bits of keystream\n");
+       printf("Recover key from only one complete authentication!\n\n");

 
 

-int main (int argc, char *argv[]) {
-  struct Crypto1State *revstate;
-  uint64_t key;     // recovered key
-  uint32_t uid;     // serial number
-  uint32_t nt;      // tag challenge
-  uint32_t nr_enc;  // encrypted reader challenge
-  uint32_t ar_enc;  // encrypted reader response
-  uint32_t at_enc;  // encrypted tag response
-  uint32_t ks2;     // keystream used to encrypt reader response
-  uint32_t ks3;     // keystream used to encrypt tag response
+       if (argc < 6 ) {
+               printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc] [enc...]\n\n", argv[0]);
+               return 1;
+       }

 
 

-  printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
-  printf("Recover key from only one complete authentication!\n\n");
+       int encc = argc - 6;
+       int enclen[encc];
+       uint8_t enc[encc][120]; 

 
 

-  if (argc < 6) {
-    printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
-    return 1;
-  }
+       sscanf(argv[1], "%x", &uid);
+       sscanf(argv[2], "%x", &nt);
+       sscanf(argv[3], "%x", &nr_enc);
+       sscanf(argv[4], "%x", &ar_enc);
+       sscanf(argv[5], "%x", &at_enc);
+       for (int i = 0; i < encc; i++) {
+               enclen[i] = strlen(argv[i + 6]) / 2;
+               for (int i2 = 0; i2 < enclen[i]; i2++) {
+                       sscanf(argv[i+6] + i2*2,"%2x", (unsigned int*)&enc[i][i2]);
+               }
+       }

 
 

-  sscanf(argv[1],"%x",&uid);
-  sscanf(argv[2],"%x",&nt);
-  sscanf(argv[3],"%x",&nr_enc);
-  sscanf(argv[4],"%x",&ar_enc);
-  sscanf(argv[5],"%x",&at_enc);
+       printf("Recovering key for:\n");
+       printf("   uid: %08x\n", uid);
+       printf("    nt: %08x\n", nt);
+       printf("  {nr}: %08x\n", nr_enc);
+       printf("  {ar}: %08x\n", ar_enc);
+       printf("  {at}: %08x\n", at_enc);
+       for (int i = 0; i < encc; i++) {
+               printf("{enc%d}: ", i);
+               for (int i2 = 0; i2 < enclen[i]; i2++) {
+                       printf("%02x", enc[i][i2]);
+               }
+               printf("\n");
+       }

 
 

-  printf("Recovering key for:\n");
-  printf("  uid: %08x\n",uid);
-  printf("   nt: %08x\n",nt);
-  printf(" {nr}: %08x\n",nr_enc);
-  printf(" {ar}: %08x\n",ar_enc);
-  printf(" {at}: %08x\n",at_enc);
+       printf("\nLFSR successors of the tag challenge:\n");
+       printf("  nt' : %08x\n",prng_successor(nt, 64));
+       printf("  nt'': %08x\n",prng_successor(nt, 96));

 
 

-/*     
-  uint32_t uid                = 0x9c599b32;
-  uint32_t tag_challenge      = 0x82a4166c;
-  uint32_t nr_enc             = 0xa1e458ce;
-  uint32_t reader_response    = 0x6eea41e0;
-  uint32_t tag_response       = 0x5cadf439;
-*/
-       // 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));
+       // Extract the keystream from the messages
+       ks2 = ar_enc ^ prng_successor(nt, 64);
+       ks3 = at_enc ^ prng_successor(nt, 96);
+       
+       uint64_t start_time = msclock();
+       revstate = lfsr_recovery64(ks2, ks3);
+       uint64_t time_spent = msclock() - start_time;
+       printf("Time spent in lfsr_recovery64(): %1.2f seconds\n", (float)time_spent/1000.0);
+       printf("\nKeystream used to generate {ar} and {at}:\n");
+       printf("   ks2: %08x\n",ks2);
+       printf("   ks3: %08x\n",ks3);

 
 

-  // Extract the keystream from the messages
-  printf("\nKeystream used to generate {ar} and {at}:\n");
-  ks2 = ar_enc ^ prng_successor(nt, 64);
-  ks3 = at_enc ^ prng_successor(nt, 96);
-  printf("  ks2: %08x\n",ks2);
-  printf("  ks3: %08x\n",ks3);
+       // Decrypting communication using keystream if presented
+       if (argc > 6 ) {
+       printf("\nDecrypted communication:\n");
+       uint8_t ks4; 
+       int rollb = 0;
+       for (int i = 0; i < encc; i++) {
+               printf("{dec%d}: ", i);
+               for (int i2 = 0; i2 < enclen[i]; i2++) {  
+                       ks4 = crypto1_byte(revstate, 0, 0);
+                       printf("%02x", ks4 ^ enc[i][i2]);
+                       rollb += 1;
+               }
+               printf("\n");
+       }
+       for (int i = 0; i < rollb; i++) {
+               lfsr_rollback_byte(revstate, 0, 0);
+               }
+       }

 
 

-  revstate = lfsr_recovery64(ks2, ks3);
-  lfsr_rollback_word(revstate, 0, 0);
-  lfsr_rollback_word(revstate, 0, 0);
-  lfsr_rollback_word(revstate, nr_enc, 1);
-  lfsr_rollback_word(revstate, uid ^ nt, 0);
-  crypto1_get_lfsr(revstate, &key);
-  printf("\nFound Key: [%012"llx"]\n\n",key);
-  crypto1_destroy(revstate);
+       lfsr_rollback_word(revstate, 0, 0);
+       lfsr_rollback_word(revstate, 0, 0);
+       lfsr_rollback_word(revstate, nr_enc, 1);
+       lfsr_rollback_word(revstate, uid ^ nt, 0);
+       crypto1_get_lfsr(revstate, &key);
+       crypto1_destroy(revstate);

 
 

-  return 0;
+       printf("\nFound Key: [%012" PRIx64"]\n\n",key);
+       

 }
 }