randomdev_keystream
randomdev_keystream(p_key, p_counter, buf, bytecount);
randomdev_keystream(p_key, p_counter, buf, chunk_size);
randomdev_keystream(p_key, p_counter, newkey,
randomdev_keystream(p_key, p_counter, remainder_buf,
randomdev_keystream(p_key, p_counter, newkey, RANDOM_KEYSIZE);
randomdev_keystream(&fortuna_state.fs_key, &fortuna_state.fs_counter,
void randomdev_keystream(union randomdev_key *context, uint128_t *, void *, size_t);
randomdev_keystream(&context, &a, trash, sizeof(trash));