75 lines
1.7 KiB
Haskell
75 lines
1.7 KiB
Haskell
{- git-annex crypto types
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-
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- Copyright 2011-2020 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Types.Crypto (
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EncryptionMethod(..),
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Cipher(..),
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StorableCipher(..),
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EncryptedCipherVariant(..),
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KeyIds(..),
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cipherKeyIds,
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Mac(..),
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readMac,
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showMac,
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macMap,
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defaultMac,
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calcMac,
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) where
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import Utility.Hash
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import Utility.Gpg (KeyIds(..))
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import Data.Typeable
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import qualified Data.Map as M
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data EncryptionMethod
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= NoneEncryption
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| SharedEncryption
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| PubKeyEncryption
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| SharedPubKeyEncryption
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| HybridEncryption
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deriving (Typeable, Eq)
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-- XXX ideally, this would be a locked memory region
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data Cipher = Cipher String | MacOnlyCipher String
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data StorableCipher
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= EncryptedCipher String EncryptedCipherVariant KeyIds
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| SharedCipher String
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| SharedPubKeyCipher String KeyIds
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deriving (Ord, Eq)
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data EncryptedCipherVariant = Hybrid | PubKey
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deriving (Ord, Eq)
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cipherKeyIds :: StorableCipher -> Maybe KeyIds
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cipherKeyIds (EncryptedCipher _ _ ks) = Just ks
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cipherKeyIds (SharedPubKeyCipher _ ks) = Just ks
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cipherKeyIds (SharedCipher _) = Nothing
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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 n = M.lookup n macMap
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macMap :: M.Map String Mac
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macMap = M.fromList
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[ ("HMACSHA1", HmacSha1)
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, ("HMACSHA224", HmacSha224)
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, ("HMACSHA256", HmacSha256)
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, ("HMACSHA384", HmacSha384)
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, ("HMACSHA512", HmacSha512)
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]
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