Deduplicate mfkey32 and mfkey64

[proxmark3-svn] / client / mfkey.c

diff --git a/client/mfkey.c b/client/mfkey.c
new file mode 100644 (file)
index 0000000..60cfcbb
--- /dev/null
+++ b/client/mfkey.c
@@ -0,0 +1,121 @@
+//-----------------------------------------------------------------------------
+// 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 "mfkey.h"
+
+#include "crapto1/crapto1.h"
+
+
+// recover key from 2 different reader responses on same tag challenge
+bool mfkey32(nonces_t data, uint64_t *outputkey) {
+       struct Crypto1State *s,*t;
+       uint64_t outkey = 0;
+       uint64_t key = 0;     // recovered key
+       bool isSuccess = false;
+       uint8_t counter = 0;
+
+       s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
+
+       for(t = s; t->odd | t->even; ++t) {
+               lfsr_rollback_word(t, 0, 0);
+               lfsr_rollback_word(t, data.nr, 1);
+               lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
+               crypto1_get_lfsr(t, &key);
+               crypto1_word(t, data.cuid ^ data.nonce, 0);
+               crypto1_word(t, data.nr2, 1);
+               if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
+                       //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
+                       outkey = key;
+                       counter++;
+                       if (counter == 20) break;
+               }
+       }
+       isSuccess = (counter == 1);
+       *outputkey = ( isSuccess ) ? outkey : 0;
+       crypto1_destroy(s);
+       /* //un-comment to save all keys to a stats.txt file 
+       FILE *fout;
+       if ((fout = fopen("stats.txt","ab")) == NULL) { 
+               PrintAndLog("Could not create file name stats.txt");
+               return 1;
+       }
+       fprintf(fout, "mfkey32,%d,%08x,%d,%s,%04x%08x,%.0Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t)(outkey>>32) & 0xFFFF,(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
+       fclose(fout);
+       */
+       return isSuccess;
+}
+
+// recover key from 2 reader responses on 2 different tag challenges
+bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
+       struct Crypto1State *s, *t;
+       uint64_t outkey  = 0;
+       uint64_t key       = 0;                 // recovered key
+       bool isSuccess = false;
+       int counter = 0;
+       
+       s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
+  
+       for(t = s; t->odd | t->even; ++t) {
+               lfsr_rollback_word(t, 0, 0);
+               lfsr_rollback_word(t, data.nr, 1);
+               lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
+               crypto1_get_lfsr(t, &key);
+               
+               crypto1_word(t, data.cuid ^ data.nonce2, 0);
+               crypto1_word(t, data.nr2, 1);
+               if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
+                       //PrintAndLog("Found Key: [%012" PRIx64 "]",key);
+                       outkey=key;
+                       ++counter;
+                       if (counter==20)
+                               break;
+               }
+       }
+       isSuccess       = (counter == 1);
+       *outputkey = ( isSuccess ) ? outkey : 0;
+       crypto1_destroy(s);
+       /* // un-comment to output all keys to stats.txt
+       FILE *fout;
+       if ((fout = fopen("stats.txt","ab")) == NULL) { 
+               PrintAndLog("Could not create file name stats.txt");
+               return 1;
+       }
+       fprintf(fout, "moebius,%d,%08x,%d,%s,%04x%08x,%0.Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t) (outkey>>32),(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);
+       fclose(fout);
+       */
+       return isSuccess;
+}
+
+// recover key from reader response and tag response of one authentication sequence
+int mfkey64(nonces_t data, uint64_t *outputkey){
+       uint64_t key    = 0;                            // recovered key
+       uint32_t ks2;                                           // keystream used to encrypt reader response
+       uint32_t ks3;                                           // keystream used to encrypt tag response
+       struct Crypto1State *revstate;
+       
+       // Extract the keystream from the messages
+       ks2 = data.ar ^ prng_successor(data.nonce, 64);
+       ks3 = data.at ^ prng_successor(data.nonce, 96);
+       revstate = lfsr_recovery64(ks2, ks3);
+       lfsr_rollback_word(revstate, 0, 0);
+       lfsr_rollback_word(revstate, 0, 0);
+       lfsr_rollback_word(revstate, data.nr, 1);
+       lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
+       crypto1_get_lfsr(revstate, &key);
+       // PrintAndLog("Found Key: [%012" PRIx64 "]", key);
+       crypto1_destroy(revstate);
+       *outputkey = key;
+       
+       return 0;
+}
+
+