I decided to switch to openssl for now, since I don't know when the master branch with sodium will be released, but having some problem figuring out what to write in the config-file.
Right now my config file looks like the following, except I use a different key but of the same byte-length.
As can be seen I have set mode to "null" because I don't know what to put there. Can it be null or can someone tell me what to type instead?
return array( 'default' => array( 'type' => 'openssl', 'key' => 'Uc*Vr5yF.jjFo/Tn3|HBX@6E€HRRMc', 'cipher' => 'AES-256-CBC', 'mode' => null, ), );