imp and GnuPG/PGP

[Harry Hoffman]

Hey All,
  I had asked this question a little while ago and hadn't gotten any
responses. I'm guessing that means no one is doing it but I thought I'd
ask again anyhow.
  On the backend on IMP I have all my user info stored in an LDAP db. I
would like to allow users to sign their mail with either GnuPG/PGP key for
encryption and store their public/private keys in the LDAP db. I'm
wondering if anyone else has thought of/is currently doing this?
  Or if anyone would know what kind of effort this would take in modifying
IMP to do so?

Thanks,
Harry