39 lines
1.0 KiB
Haskell
39 lines
1.0 KiB
Haskell
-- |
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-- Module : Crypto.Cipher.DES
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-- License : BSD-style
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-- Maintainer : Vincent Hanquez <vincent@snarc.org>
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-- Stability : stable
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-- Portability : good
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--
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module Crypto.Cipher.DES
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( DES
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) where
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import Data.Word
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import Crypto.Error
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import Crypto.Cipher.Types
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import Crypto.Cipher.DES.Primitive
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import Crypto.Internal.ByteArray (ByteArrayAccess)
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import qualified Crypto.Internal.ByteArray as B
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-- | DES Context
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data DES = DES Word64
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deriving (Eq)
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instance Cipher DES where
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cipherName _ = "DES"
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cipherKeySize _ = KeySizeFixed 8
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cipherInit k = initDES k
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instance BlockCipher DES where
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blockSize _ = 8
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ecbEncrypt (DES key) = B.mapAsWord64 (unBlock . encrypt key . Block)
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ecbDecrypt (DES key) = B.mapAsWord64 (unBlock . decrypt key . Block)
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initDES :: ByteArrayAccess key => key -> CryptoFailable DES
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initDES k
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| len == 8 = CryptoPassed $ DES key
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| otherwise = CryptoFailed $ CryptoError_KeySizeInvalid
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where len = B.length k
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key = B.toW64BE k 0
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