typedef SilcSKEStatus (*SilcSKECheckVersion)(SilcSKE ske,
                                                 unsigned char *version,
                                                 SilcUInt32 len, void *context);

    Callback function used to check the version of the remote SKE server.
    The SKE library will call this function so that the appliation may
    check its version against the remote host's version. This returns
    SILC_SKE_STATUS_OK if the version string is Ok, and returns
    SILC_SKE_STATUS_BAD_VERSION if the version was not acceptable.