loop-aes swap

Robert Connolly robert at linuxfromscratch.org
Sun Feb 8 20:02:45 PST 2009

This is my patch to make loop-aes use /dev/random exclusively, and exit 
otherwise (no fallback). It's not perfect, it allows /dev/urandom to be used 
to hit the swap space, during swapoff, so sha can hash it to generate 
fallback entropy, even though swapon will exit before that happens... fixing 
this could involve a #define or ./configure option. I did the fewest 
modifications possible while still achieving my goal. This patch should be 

Only use this with rngd, or else you may wait for /dev/random for a very long 
time when mounting swap.

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