TST_KEY
if (docrypt(data[TST_KEY], length[TST_KEY],
dochacha(data[TST_KEY], length[TST_KEY], data[TST_IV],
dopoly(data[TST_KEY], length[TST_KEY], data[TST_IV],
dogmac(data[TST_KEY], length[TST_KEY], data[TST_IV], length[TST_IV],