brute force attack on dm-crypt

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Hi!
I forgot a password for an dm-crypt encrypted partition and would like
to try to break the encryption by brute force. Therefore I have some
questions.

Are there incompatibilities between old dm-crypt and LUKS or is it
possible to mount an old partition which is encrypted with dm-crypt (no
LUKS!) in an up-to-date distributions?

Tools like John the Ripper are great for cracking hashed passwords. Is
it possible to extract a hash out of a partition which can be used for
such attacks as John the Ripper do? If so, do you have any reference how
to execute this task?

Otherwise, I would need to try to mount the partition with each
potential password which would be quite slow. Do you have any
suggestions how to speed up this process?

Regards
Stefan

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