From: iceman1001 <iceman@iuse.se>
Date: Wed, 24 Aug 2016 12:10:30 +0000 (+0200)
Subject: CHG:   added a verification to see if the found candidate key was able to validate... 
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/760157f50bbb2c9b4f2ab01a74d76d062fc418ba

CHG:   added a verification to see if the found candidate key was able to validate against tag.  If not ok,  start darkside attack again.
---

diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index 65c9dcb7..c25ba32b 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -239,6 +239,17 @@ start:
 		c.arg[0] = false;
 		goto start;
 	} else {
+		
+		// nonce2key found a candidate key.  Lets verify it.
+		uint8_t keyblock[] = {0,0,0,0,0,0};
+		num_to_bytes(r_key, 6, keyblock);
+		uint64_t key64 = 0;
+		int res = mfCheckKeys(blockNo, keytype - 0x60 , false, 1, keyblock, &key64);
+		if ( res > 0 ) {
+			PrintAndLog("Candidate Key found (%012"llx")", r_key);	
+			PrintAndLog("Failing is expected to happen. Trying again ...");
+			goto start;
+		}
 		PrintAndLog("Found valid key: %012"llx" \n", r_key);
 	}
 END: