added mfkey

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

diff --git a/tools/mfkey/mfkey.c b/tools/mfkey/mfkey.c
new file mode 100755 (executable)
index 0000000..442403f
--- /dev/null
+++ b/tools/mfkey/mfkey.c
@@ -0,0 +1,65 @@
+// Test-file: test2.c
+#include "crapto1.h"
+#include <stdio.h>
+
+int main (int argc, char *argv[]) {
+  struct Crypto1State *revstate;
+  uint64_t lfsr;
+  uint8_t* plfsr = (uint8_t*)&lfsr;
+  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
+
+  printf("MIFARE Classic key recovery\n\n");
+
+  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);
+
+  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);
+
+/*     
+  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
+  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);
+
+  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, &lfsr);
+  printf("\nFound Key: [%02x %02x %02x %02x %02x %02x]\n\n",plfsr[5],plfsr[4],plfsr[3],plfsr[2],plfsr[1],plfsr[0]);
+
+  return 0;
+}