# define APP_PASS_LEN 1024
-# define SERIAL_RAND_BITS 64
+/*
+ * IETF RFC 5280 says serial number must be <= 20 bytes. Use 159 bits
+ * so that the first bit will never be one, so that the DER encoding
+ * rules won't force a leading octet.
+ */
+# define SERIAL_RAND_BITS 159
int app_isdir(const char *);
int app_access(const char *, int flag);