Oracle support

Hello,

Wanting to update my yubikey-ksm, I see that the oracle support I implemented a while ago was not there.
I guess the pull request was still pending when I deleted the fork on my side, and so it got lost.

This is not the cleanest way ever for the oracle support, but as ykksm-decrypt.php is pretty simple, I guess it isn't worth doing with classes.

Best regards,
Rémi.