EVP_PKEY_meth_set_param_check
OSSL_DEPRECATEDIN_3_0 void EVP_PKEY_meth_set_param_check(EVP_PKEY_METHOD *pmeth, int (*check)(EVP_PKEY *pkey));
EVP_PKEY_meth_set_param_check(custom_pmeth, pkey_custom_param_check);