fix: crapto3.3 sometimes crashing with hf mf mifare on Fudan clones (no par, all NACK) (#233)

added readme.txt again in tools/nonce2key

tools/nonce2key/Makefile

@@ -14,7 +14,7 @@ all: $(OBJS) $(EXES)
 %.o : %.c
 	$(CC) $(CFLAGS) -c -o $@ $<
 
-% : %.c
+% : %.c $(OBJS)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS) $<
 
 clean: 

tools/nonce2key/nonce2key.c

@@ -47,7 +47,7 @@ int main(const int argc, const char* argv[]) {
     printf("%01x|\n",par[i][7]);
   }
   
-  state = lfsr_common_prefix(nr,rr,ks3x,par);
+  state = lfsr_common_prefix(nr,rr,ks3x,par,0);
   lfsr_rollback_word(state,uid^nt,0);
   crypto1_get_lfsr(state,&key_recovered);
   printf("\nkey recovered: %012" PRIx64 "\n\n",key_recovered);

tools/nonce2key/readme.txt

@@ -0,0 +1,7 @@
+To test the nonce2key tool.
+
+:: tip
+You can use the output from "hf mf mifare"  to use with this tool. 
+
+:: sample
+./nonce2key e9cadd9c a8bf4a12 a020a8285858b090 050f010607060e07