EC_KEY_get_conv_form
publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
point_conversion_form_t format = EC_KEY_get_conv_form(eckey);
return EC_KEY_get_conv_form(ec);
OSSL_DEPRECATEDIN_3_0 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
pub_len = EC_KEY_key2buf(ec, EC_KEY_get_conv_form(ec), &pub, NULL);
point_conversion_form_t format = EC_KEY_get_conv_form(eckey);
format = EC_KEY_get_conv_form(ec);