[kadoban]

I stopped using it recently, but cryptsetup (with luks if it matters) definitely allows passphrases. I think my longest was ~50 characters? Not sure if you were going beyond that.

I can't seem to find any old (or new) complaints about it limiting, or anything about a fix for same. You sure it was that?

[input_sh]

My mistake, I wanted to write that gnome-disks struggled with longer passphrases, not cryptsetup.

I've edited my comment above to fix that mistake.