-RAND_load_file() reads a number of bytes from file B<filename> and
-adds them to the PRNG. If B<max_bytes> is non-negative,
-up to B<max_bytes> are read;
-if B<max_bytes> is -1, the complete file is read.
-
-RAND_write_file() writes a number of random bytes (currently 1024) to
-file B<filename> which can be used to initialize the PRNG by calling
-RAND_load_file() in a later session.
-