SilcSKEStatus
    silc_ske_payload_start_decode(SilcSKE ske,
                                  SilcBuffer buffer,
                                  SilcSKEStartPayload *return_payload);

    Utility function used to decode Key Exchange Start Payload from the
    `buffer' data buffer. The decoded payload is returned into the
    `return_payload' and the caller must free it.