improved version of "hf 14a mifare" command

[proxmark3-svn] / client / nonce2key / nonce2key.c

diff --git a/client/nonce2key/nonce2key.c b/client/nonce2key/nonce2key.c
new file mode 100644 (file)
index 0000000..1c7ee14
--- /dev/null
+++ b/client/nonce2key/nonce2key.c
@@ -0,0 +1,57 @@
+//-----------------------------------------------------------------------------
+// Merlok - June 2011
+// Roel - Dec 2009
+// Unknown author
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// MIFARE Darkside hack
+//-----------------------------------------------------------------------------
+
+#include "nonce2key.h"
+#include "ui.h"
+
+int nonce2key(uint32_t uid, uint32_t nt, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
+  struct Crypto1State *state;
+  uint32_t pos, nr, rr, nr_diff;//, ks1, ks2;
+  byte_t bt, i, ks3x[8], par[8][8];
+  uint64_t key_recovered;
+  nr = rr = 0;
+  
+  // Reset the last three significant bits of the reader nonce
+  nr &= 0xffffff1f;
+  
+  PrintAndLog("\nuid(%08x) nt(%08x) par(%016llx) ks(%016llx)\n\n",uid,nt,par_info,ks_info);
+
+  for (pos=0; pos<8; pos++)
+  {
+    ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
+    bt = (par_info >> (pos*8)) & 0xff;
+    for (i=0; i<8; i++)
+    {
+      par[7-pos][i] = (bt >> i) & 0x01;
+    }
+  }
+
+  printf("|diff|{nr}    |ks3|ks3^5|parity         |\n");
+  printf("+----+--------+---+-----+---------------+\n");
+  for (i=0; i<8; i++)
+  {
+    nr_diff = nr | i << 5;
+    printf("| %02x |%08x|",i << 5, nr_diff);
+    printf(" %01x |  %01x  |",ks3x[i], ks3x[i]^5);
+    for (pos=0; pos<7; pos++) printf("%01x,", par[i][pos]);
+    printf("%01x|\n", par[i][7]);
+  }
+  
+  state = lfsr_common_prefix(nr, rr, ks3x, par);
+  lfsr_rollback_word(state, uid^nt, 0);
+  crypto1_get_lfsr(state, &key_recovered);
+  crypto1_destroy(state);
+       
+       *key = key_recovered;
+  
+  return 0;
+}