This is a wrapper around http://hackage.haskell.org/package/Crypto that currently does fingerprint generation and signature verification.
The recommended way to import this module is:
import qualified Data.OpenPGP.Crypto as OpenPGP
Keys that may have made the signature
Message containing data and signature packet
Index of signature to verify (0th, 1st, etc)
Verify a message signature. Only supports RSA keys for now.