EVP_PKEY_meth_get_ctrl
EVP_PKEY_meth_get_ctrl(dasync_rsa_orig, &pctrl, NULL);
EVP_PKEY_meth_get_ctrl(dasync_rsa_orig, NULL, &pctrl_str);
OSSL_DEPRECATEDIN_3_0 void EVP_PKEY_meth_get_ctrl(const EVP_PKEY_METHOD *pmeth,
EVP_PKEY_meth_get_ctrl(orig_pmeth, &pctrl, NULL);