$value_signed = $ssl->sign( $value , $passphrase );
Looks like:
So long, and thanks for all the fish.
-----BEGIN openSSL.php SIGNATURE-----
e35fbZmTXYbVP33HY1CX31hxirAiENmEY4A0JHiGqPDfS87BmDQszGHPmUBI74Hl
CSvnMAyyqF7OuwRYnRS+VdiDNy2y3Uh2gqB7SNGXgWZnRNsMTeGX4OKXGgqAKsj1
NB5uwUQ+zNu7QjYfapQyliYoOWS5L+GcmFRHveTwAgw=
-----END openSSL.php SIGNATURE-----