SilcSKE silc_ske_alloc(SilcRng rng, void *context);

    Allocates the SKE session context and returns it.  The `rng' is
    the random number generator the SKE is going to use when it needs
    random number generation during the SKE session.  The `context' is
    user context that the libary will not touch.  The application can
    access that context with the ske->user_context if needed.  The
    application is responsible of freeing the `context'.  After the
    SKE session context is allocated application must call the
    silc_ske_set_callbacks.