55 lines
1.7 KiB
Haskell
55 lines
1.7 KiB
Haskell
-- |
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-- Module : Crypto.Hash.SHA512t
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-- License : BSD-style
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-- Maintainer : Vincent Hanquez <vincent@snarc.org>
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-- Stability : experimental
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-- Portability : unknown
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--
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-- A module containing SHA512/t
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--
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module Crypto.Hash.SHA512t
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( Ctx(..)
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-- * Incremental hashing Functions
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, init -- :: Ctx
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, update -- :: Ctx -> ByteString -> Ctx
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, finalize -- :: Ctx -> ByteString
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-- * Single Pass hashing
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, hash -- :: ByteString -> ByteString
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, hashlazy -- :: ByteString -> ByteString
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) where
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import Prelude hiding (init, take)
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import Data.List (foldl')
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import qualified Data.ByteString.Lazy as L
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import qualified Crypto.Hash.SHA512 as SHA512
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import Crypto.Internal.Compat
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import Crypto.Internal.ByteArray (ByteArray, ByteArrayAccess, take)
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import qualified Crypto.Hash.Internal.SHA512t as SHA512t
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import Crypto.Hash.Internal.SHA512 (withCtxNew)
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-- | SHA512 Context with variable size output
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data Ctx = Ctx !Int !SHA512.Ctx
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-- | init a context
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init :: Int -> Ctx
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init t = Ctx t $ unsafeDoIO $ withCtxNew $ \ptr -> SHA512t.internalInitAt t ptr
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-- | update a context with a bytestring
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update :: ByteArrayAccess ba => Ctx -> ba -> Ctx
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update (Ctx t ctx) d = Ctx t (SHA512.update ctx d)
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-- | finalize the context into a digest bytestring
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finalize :: ByteArray digest => Ctx -> digest
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finalize (Ctx sz ctx) = take (sz `div` 8) (SHA512.finalize ctx)
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-- | hash a strict bytestring into a digest bytestring
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hash :: (ByteArrayAccess ba, ByteArray digest) => Int -> ba -> digest
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hash t = finalize . update (init t)
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-- | hash a lazy bytestring into a digest bytestring
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hashlazy :: ByteArray digest => Int -> L.ByteString -> digest
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hashlazy t = finalize . foldl' update (init t) . L.toChunks
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