module Crypto.Hash.MD4
( Ctx(..)
, MD4
, init
, update
, finalize
, hash
, hashlazy
) where
import Prelude hiding (init)
import Foreign
import Foreign.C.String
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as L
import Data.ByteString (ByteString)
import Data.ByteString.Unsafe (unsafeUseAsCString, unsafeUseAsCStringLen)
import Data.ByteString.Internal (create, memcpy)
#ifdef HAVE_CRYPTOAPI
import Control.Monad (liftM)
import Data.Serialize (Serialize(..))
import Data.Serialize.Get (getByteString)
import Data.Serialize.Put (putByteString)
import Data.Tagged (Tagged(..))
import qualified Crypto.Classes as C (Hash(..))
instance C.Hash Ctx MD4 where
outputLength = Tagged (16 * 8)
blockLength = Tagged (64 * 8)
initialCtx = init
updateCtx = update
finalize ctx bs = Digest . finalize $ update ctx bs
instance Serialize MD4 where
get = liftM Digest (getByteString digestSize)
put (Digest d) = putByteString d
#endif
data Ctx = Ctx !ByteString
data MD4 = Digest !ByteString
deriving (Eq,Ord,Show)
digestSize, sizeCtx :: Int
digestSize = 16
sizeCtx = 96
instance Storable Ctx where
sizeOf _ = sizeCtx
alignment _ = 16
poke ptr (Ctx b) = unsafeUseAsCString b (\cs -> memcpy (castPtr ptr) (castPtr cs) (fromIntegral sizeCtx))
peek ptr = create sizeCtx (\bptr -> memcpy bptr (castPtr ptr) (fromIntegral sizeCtx)) >>= return . Ctx
foreign import ccall unsafe "md4.h md4_init"
c_md4_init :: Ptr Ctx -> IO ()
foreign import ccall "md4.h md4_update"
c_md4_update :: Ptr Ctx -> CString -> Word32 -> IO ()
foreign import ccall unsafe "md4.h md4_finalize"
c_md4_finalize :: Ptr Ctx -> CString -> IO ()
allocInternal :: (Ptr Ctx -> IO a) -> IO a
allocInternal = alloca
allocInternalFrom :: Ctx -> (Ptr Ctx -> IO a) -> IO a
allocInternalFrom ctx f = allocInternal $ \ptr -> (poke ptr ctx >> f ptr)
updateInternalIO :: Ptr Ctx -> ByteString -> IO ()
updateInternalIO ptr d =
unsafeUseAsCStringLen d (\(cs, len) -> c_md4_update ptr cs (fromIntegral len))
finalizeInternalIO :: Ptr Ctx -> IO ByteString
finalizeInternalIO ptr =
allocaBytes digestSize (\cs -> c_md4_finalize ptr cs >> B.packCStringLen (cs, digestSize))
init :: Ctx
init = unsafePerformIO $ allocInternal $ \ptr -> do (c_md4_init ptr >> peek ptr)
update :: Ctx -> ByteString -> Ctx
update ctx d = unsafePerformIO $ allocInternalFrom ctx $ \ptr -> do updateInternalIO ptr d >> peek ptr
finalize :: Ctx -> ByteString
finalize ctx = unsafePerformIO $ allocInternalFrom ctx $ \ptr -> do finalizeInternalIO ptr
hash :: ByteString -> ByteString
hash d = unsafePerformIO $ allocInternal $ \ptr -> do
c_md4_init ptr >> updateInternalIO ptr d >> finalizeInternalIO ptr
hashlazy :: L.ByteString -> ByteString
hashlazy l = unsafePerformIO $ allocInternal $ \ptr -> do
c_md4_init ptr >> mapM_ (updateInternalIO ptr) (L.toChunks l) >> finalizeInternalIO ptr