This is a wrapper around <http://hackage.haskell.org/package/Crypto>
that currently does fingerprint generation, signature generation, and
signature verification (for RSA keys only).

It is indended to be used with <http://hackage.haskell.org/package/openpgp>

It is intended that you use qualified imports with this library.

> import qualified Data.OpenPGP.Crypto as OpenPGP