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|
{- git-annex crypto types
-
- Copyright 2011-2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Types.Crypto (
Cipher(..),
StorableCipher(..),
KeyIds(..),
Mac(..),
readMac,
showMac,
defaultMac,
calcMac,
) where
import qualified Data.ByteString.Lazy as L
import Data.Digest.Pure.SHA
import Utility.Gpg (KeyIds(..))
-- XXX ideally, this would be a locked memory region
newtype Cipher = Cipher String
data StorableCipher = EncryptedCipher String KeyIds | SharedCipher String
deriving (Ord, Eq)
{- File names are (client-side) MAC'ed on special remotes.
- The chosen MAC algorithm needs to be same for all files stored on the
- remote.
-}
data Mac = HmacSha1 | HmacSha224 | HmacSha256 | HmacSha384 | HmacSha512
deriving (Eq)
defaultMac :: Mac
defaultMac = HmacSha1
-- MAC algorithms are shown as follows in the file names.
showMac :: Mac -> String
showMac HmacSha1 = "HMACSHA1"
showMac HmacSha224 = "HMACSHA224"
showMac HmacSha256 = "HMACSHA256"
showMac HmacSha384 = "HMACSHA384"
showMac HmacSha512 = "HMACSHA512"
-- Read the MAC algorithm from the remote config.
readMac :: String -> Maybe Mac
readMac "HMACSHA1" = Just HmacSha1
readMac "HMACSHA224" = Just HmacSha224
readMac "HMACSHA256" = Just HmacSha256
readMac "HMACSHA384" = Just HmacSha384
readMac "HMACSHA512" = Just HmacSha512
readMac _ = Nothing
calcMac
:: Mac -- ^ MAC
-> L.ByteString -- ^ secret key
-> L.ByteString -- ^ message
-> String -- ^ MAC'ed message, in hexadecimals
calcMac mac = case mac of
HmacSha1 -> showDigest $* hmacSha1
HmacSha224 -> showDigest $* hmacSha224
HmacSha256 -> showDigest $* hmacSha256
HmacSha384 -> showDigest $* hmacSha384
HmacSha512 -> showDigest $* hmacSha512
where
($*) g f x y = g $ f x y
|
