It's probably related to the loopback device.
Hm. It's possible (and quite easy) to create a loopback device that handles cryptography. You might be able to use that as a swapdevice. :-)
/ Per Hedbor ()
Previous text:
2003-01-28 14:26: Subject: Re: OpenSSL wrapper vs Pike's SSL (Was: Bz2)
I saw some crypto and hash stuff in a recent kernel, but I don't know what problem it is supposed to solve.
/ Mirar