loop device memory usage

[Newsmail <newsmail@satimex.tvnet.hu>]

hi i'm using loop-aes with aes128 mostly, I would like to know how we can 
calculate the memory usage the loop device needs for a specific amount of 
data to encrypt. jari mentioned when he talked about swap encryption that 
when the machine needs to swap it tries to free memory by it, but to 
encrypt the swap we need memory, and bingo :) well, how can we calculate 
that need or how does it work?
regards,
greg


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Linux-crypto:  cryptography in and on the Linux system
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