X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d9ed4e191445d342d11e35fbe4886980e40771a8..39d43ccc21f7c700010beb3f79773abbe13870a3:/client/cmdhfmf.c

diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index d6e39444..65c9dcb7 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -213,9 +213,16 @@ start:
 	}	
 	printf("\n");
 	
-	// par == 0
-	if (isOK == -1 && par_list == 0) {
-		if (!nonce2key_ex(uid, nt, nr, ks_list, &r_key) ){
+	// par == 0,  and -4
+	if (isOK == -4 && par_list == 0) {
+		// this special attack when parities is zero, uses checkkeys. Which now with block/keytype option also needs. 
+		// but it uses 0|1 instead of 0x60|0x61...
+		if (nonce2key_ex(blockNo, keytype - 0x60 , uid, nt, nr, ks_list, &r_key) ){
+			PrintAndLog("Key not found (lfsr_common_prefix list is null).");	
+			PrintAndLog("Failing is expected to happen in 25%% of all cases. Trying again with a different reader nonce...");
+			c.arg[0] = false;
+			goto start;
+		} else {
 			PrintAndLog("Found valid key: %012"llx" \n", r_key);
 			goto END;
 		}