ossl_x448_public_from_private
ossl_x448_public_from_private(key->pubkey, key->privkey);
void ossl_x448_public_from_private(uint8_t out_public_value[56],
ossl_x448_public_from_private(key->pubkey, privkey);
ossl_x448_public_from_private(pub, ecx->privkey);