dedupe_alg_names
cipher = dedupe_alg_names(nk_in->enc.name, nk_out->enc.name);
mac = dedupe_alg_names(nk_in->mac.name, nk_out->mac.name);
comp = dedupe_alg_names(nk_in->comp.name, nk_out->comp.name);
volumes = dedupe_alg_names(in, out);