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