Add simple algorithm for converting result hash to password

lib/util/hashtopass.h

@@ -0,0 +1,12 @@
+#include "scrypt_platform.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "warn.h"
+
+void hashtopass(char* p, size_t len, uint8_t* key);