What is the maximum useful size of a keyfile with respect to the --cipher and --key-size parameters?
For example, with `--cipher aes-xts-plain64 --key-size 512` is there any advantage, be it security or otherwise, of using a keyfile which is larger than 512 bits (64 bytes)?
The context of this question is that I am creating an encrypted disk that will only be unlocked with keyfiles. I noticed that `cryptsetup --help` gives a maximum keyfile size of 8192kB which is quite large in comparison to the key size. I did not find the answer in the FAQ.
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