X509_PUBKEY_get0
if ((pkey = X509_PUBKEY_get0(key)) == NULL)
return (X509_PUBKEY_get0(x->cert_info->key));
return X509_PUBKEY_get0(req->req_info->pubkey);
EVP_PKEY * X509_PUBKEY_get0(X509_PUBKEY *key);