SilcUInt8 silc_rng_get_byte_fast(SilcRng rng);

    Returns one 8-bit random byte from the random number generator as
    fast as possible.

    This will read the data from /dev/urandom if it is available in the
    operating system, since this may be faster than retrieving a byte
    from the SILC RNG.  If /dev/urandom is not available this will take
    the byte from SILC RNG and is effectively same as silc_rng_get_byte.