crypto1_bs.diff

diff --git a/Makefile b/Makefile
index 758e411..c0708be 100755
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@
 
 CC     = gcc
 
-CFLAGS = -std=gnu99 -O3 -march=native
+CFLAGS = -std=gnu99 -O3 -march=native -fcommon
 
 all: solve_bs solve_piwi_bs solve_piwi libnfc_crypto1_crack
 
diff --git a/libnfc_crypto1_crack.c b/libnfc_crypto1_crack.c
index 2015dcb..4147433 100755
--- a/libnfc_crypto1_crack.c
+++ b/libnfc_crypto1_crack.c
@@ -730,6 +730,17 @@ int main (int argc, const char * argv[]) {
         return 1;
     } else {
         printf("Found key: %012"PRIx64"\n", found_key);
+        if (argc==7) {
+            FILE *fpKey = NULL;
+            fpKey = fopen(argv[6], "a");
+            if (fpKey) {
+                fprintf(fpKey, "%012"PRIx64"\r\n", found_key);
+                fclose(fpKey);
+            } else {
+                fprintf(stderr, "Cannot open: %s, exiting\n", argv[6]);
+                return 1;
+            }
+        }
     }
     printf("Tested %"llu" states\n", total_states_tested);