Support TCRYPT passphrases with more than 64 characters
It was reported to us at Tails, that users using VeraCrypt volumes with more than 64 characters are not able to open them in Tails (which uses cryptsetup). See https://redmine.tails.boum.org/code/issues/17474.
I reproduced this by creating a volume with 65 characters in VeraCrypt. I'm able to unlock this volume in VeraCrypt, but not via cryptsetup.
See also #358 (closed), where you asked for an example if cryptsetup behaves differently than VeraCrypt.