SilcBool silc_rng_global_init(SilcRng rng);

    This function sets the `rng' if non-NULL as global RNG context.
    When any of the silc_rng_global_* functions is called the `rng' is
    used as RNG.  If `rng' is NULL this will allocate new RNG as global
    RNG.  The application in this case must free it later by calling
    silc_rng_global_uninit.  Returns TRUE after Global RNG is initialized.

    If `rng' was non-NULL, the silc_rng_init must have been called for
    the `rng' already.

    This function can be used to define the `rng' as global RNG and then
    use silc_rng_global_* functions easily without need to provide
    the RNG as argument.