plain hash

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Hi,

two major questions (and a couple of minor) about hash methods in dm-crypt.

1) How does the -h plain switch to cryptsetup work?

How is the result interpreted if I use a 128 bit cipher and write a 1
character key or a 17 character key?

2) What is the implications of changing the de facto standard sha256
hash in "aes-cbc-essiv:sha256" cipher?

I have read that I is used to hash the "IV" which is calcuated from the
sector. Would a 32 bit CRC32 be good enough? Do I need a hash which
generates 256 bit values?

Thanks for your time to answer this mail,

Henrik Holst

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