do_cts
return do_cts(key, ivec, data, num_data, dlen, 1);
return do_cts(key, ivec, data, num_data, dlen, 0);
return do_cts(key, ivec, data, num_data, dlen, 1);
return do_cts(key, ivec, data, num_data, dlen, 0);