hx509_private_key_init
ret = hx509_private_key_init(private_key, ops, NULL);
ret = hx509_private_key_init(private_key, ops, NULL);
hx509_private_key_init (
ret = hx509_private_key_init(&key, NULL, NULL);
ret = hx509_private_key_init(&key, NULL, NULL);