SilcBool silc_dh_generate_private(SilcDH dh, const SilcMPInt **x);

    Generates random private value `x' such that 0 < x < lpf at most of
    length of lpf. Returns FALSE if the random number could not be generated.
    Returns the generated value into `x' pointer sent as argument, unless
    the `x' is NULL. The returned `x' must not be freed by the caller.