[gentoo-security] ssh-agent and cryptsetup

[Jason]

The subject kinda says it all.  I've been hunting around for an
automated solution to backing up my encrypted home directory to a remote
server through ssh.  Obviously, the backup is also an encrypted volume.  

Is there an existing solution to getting cryptsetup to use ssh-agent
for the volume key?

The end result would put my ssh private key on a thumbdrive (password
protected).  Logging in would decrypt local homedir, and rsync with
remote encrypted homedir.  Logging out would rsync push changes up to
remote encrypted home dir and tear down all encrypted volumes and
ssh-agent.

So far, I've found the articles on encrypted home dirs with dm-crypt,
using a thumbdrive to hold the key (various solutions), pam-ssh to
automatically fire up ssh-agent using the private key password to log in
(limited success with that).  But nothing regarding using ssh-agent to
decrypt a volume.

Any ideas?

Jason.
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