How to convert .kmodel to .smodel.

Is it possible to provide a method for encrypting .kmodel to .smodel? The encrypted models on maixhub cannot be applied to my own modified yolo model, and the 'sipeed_kpu_err_t sipeed_kpu_model_load(void** ctx, uint32_t flash_addr, const char* filename, uint32_t* size);' in the firmware is not open source.

Thanks a lot!