ossl_decoder_from_algorithm
method = ossl_decoder_from_algorithm(id, algodef, prov);
void *ossl_decoder_from_algorithm(int id, const OSSL_ALGORITHM *algodef,
to_obj = ossl_decoder_from_algorithm(0, to_algo, NULL);
to_obj = ossl_decoder_from_algorithm(0, to_algo, NULL);