EVP_PKEY_meth_get_paramgen
EVP_PKEY_meth_get_paramgen(dasync_rsa_orig, &pparamgen_init, NULL);
EVP_PKEY_meth_get_paramgen(dasync_rsa_orig, NULL, &pparamgen);
OSSL_DEPRECATEDIN_3_0 void EVP_PKEY_meth_get_paramgen(const EVP_PKEY_METHOD *pmeth, int (**pparamgen_init)(EVP_PKEY_CTX *ctx),