Another alternative (besides using a file on some fs) would be using LVM 
volumes, and not resolving the related symlinks.
Then /etc/crypttab would look something like:
cryptswap1 /dev/mapper/swap-swap_1 /dev/urandom swap,cipher=aes-cbc-essiv:sha256

where /dev/mapper/swap-swap_1 is a symlink maintained by device mapper.
It should NOT be resolved to target of the symlink (like /dev/dm-1)
before writing to crypttab, since target of that symlink is dynamic.

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https://bugs.launchpad.net/bugs/474258

Title:
  Extremely dangerous! cryptswap killed my partition

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