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{-# LANGUAGE CPP #-}
module Data.OpenPGP.Util.Fingerprint (fingerprint,fingerprintv,Fingerprint(..),hex) where
import qualified Data.OpenPGP as OpenPGP
import qualified Data.ByteString as BS
import qualified Data.ByteString.Lazy as LZ
import Data.Char (toUpper)
import Data.Word (Word8)
import GHC.Stack
import Numeric (showHex)
#if defined(VERSION_cryptonite)
import Crypto.Hash.Algorithms
import Crypto.Hash
import qualified Data.ByteArray as Bytes
#else
import Crypto.Hash.MD5 as MD5
import Crypto.Hash.SHA1 as SHA1
#endif
oo :: (b -> c) -> (a -> a1 -> b) -> a -> a1 -> c
oo = (.) . (.)
newtype Fingerprint = Fingerprint BS.ByteString
instance Show Fingerprint where
show fp = hex fp
hex :: Fingerprint -> String
hex (Fingerprint bs) = hexify bs
where
hexify = map toUpper . hexString . BS.unpack
hexString :: [Word8] -> String
hexString = foldr (pad `oo` showHex) ""
where
pad s | odd $ length s = '0':s
| otherwise = s
-- | Generate a key fingerprint from a PublicKeyPacket or SecretKeyPacket
-- <http://tools.ietf.org/html/rfc4880#section-12.2>
fingerprint :: HasCallStack => OpenPGP.Packet -> Fingerprint
fingerprint p = fingerprintv (OpenPGP.auto_fp_version p) p
fingerprintv :: HasCallStack => Word8 -> OpenPGP.Packet -> Fingerprint
fingerprintv v p = case v of
5 -> Fingerprint $ sha256 material
4 -> Fingerprint $ sha1 material
3 -> Fingerprint $ md5 material
_ -> error "Unsupported Packet version or type in fingerprint"
where
#if defined(VERSION_cryptonite)
sha256 x = Bytes.convert (hashlazy x :: Digest SHA256)
sha1 x = Bytes.convert (hashlazy x :: Digest SHA1)
md5 x = Bytes.convert (hashlazy x :: Digest MD5)
#else
-- TODO: SHA256 (or drop support for non-cryptonite)
sha1 = SHA1.hashlazy
md5 = MD5.hashlazy
#endif
material = LZ.concat $ OpenPGP.fingerprint_materialv v p
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