typedef void (*SilcSKEVerifyCb)(SilcSKE ske,
                                    SilcPublicKey public_key,
                                    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 `context' is the context given as
    arugment to silc_ske_set_callbacks.  See silc_ske_set_callbacks for
    more information.

    If the key repository was provided in silc_ske_alloc this callback
    is called only if the public key was not found from the repository.