<?php // new class $gnupg = new gnupg(); // not really needed. Clearsign is default $gnupg->setsignmode(gnupg::SIG_MODE_CLEAR); // add key with passphrase 'test' for signing $gnupg->addsignkey("8660281B6051D071D94B5B230549F9DC851566DC", "test"); // sign $signed = $gnupg->sign("just a test"); echo $signed;