* The following functions handle keys that are stored in some secondary  * location, handled by the engine.  The storage may be on a card or  * whatever.  */ EVP_PKEY *ENGINE_load_private_key(ENGINE *e, const char *key_id,                                   UI_METHOD *ui_method, void *callback_data); EVP_PKEY *ENGINE_load_public_key(ENGINE *e, const char *key_id,                                  UI_METHOD *ui_method, void *callback_data); int ENGINE_load_ssl_client_cert(ENGINE *e, SSL *s,                                 STACK_OF(X000_NAME) *ca_dn, 