typedef void (*SilcSKEVerifyCb)(SilcSKE ske,
                                    unsigned char *pk_data,
                                    SilcUInt32 pk_len,
                                    SilcSKEPKType pk_type,
                                    void *context,
                                    SilcSKEVerifyCbCompletion completion,
                                    void *completion_context);

    Callback function used to verify the received public key or certificate.
    The verification process is most likely asynchronous. That's why the
    application must call the `completion' callback when the verification
    process has been completed. The library then calls the user callback
    (SilcSKECb), if it was provided for the function that takes this callback
    function as argument, to indicate that the SKE protocol may continue.
    See silc_ske_set_callbacks for more information.