module Crypto.Hash.Whirlpool
( Ctx(..)
, Whirlpool
, init
, update
, finalize
, hash
, hashlazy
) where
import Prelude hiding (init)
import Foreign.Ptr
import Foreign.ForeignPtr (withForeignPtr)
import Foreign.Storable
import Foreign.Marshal.Alloc
import qualified Data.ByteString.Lazy as L
import Data.ByteString (ByteString)
import Data.ByteString.Unsafe (unsafeUseAsCStringLen)
import Data.ByteString.Internal (create, toForeignPtr, inlinePerformIO)
import Data.Word
#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 Whirlpool where
outputLength = Tagged (64 * 8)
blockLength = Tagged (64 * 8)
initialCtx = init
updateCtx = update
finalize ctx bs = Digest . finalize $ update ctx bs
instance Serialize Whirlpool where
get = liftM Digest (getByteString digestSize)
put (Digest d) = putByteString d
#endif
data Ctx = Ctx !ByteString
data Whirlpool = Digest !ByteString
deriving (Eq,Ord,Show)
digestSize :: Int
digestSize = 64
sizeCtx :: Int
sizeCtx = 168
withByteStringPtr :: ByteString -> (Ptr Word8 -> IO a) -> IO a
withByteStringPtr b f =
withForeignPtr fptr $ \ptr -> f (ptr `plusPtr` off)
where (fptr, off, _) = toForeignPtr b
memcopy64 :: Ptr Word64 -> Ptr Word64 -> IO ()
memcopy64 dst src = mapM_ peekAndPoke [0..(211)]
where peekAndPoke i = peekElemOff src i >>= pokeElemOff dst i
withCtxCopy :: Ctx -> (Ptr Ctx -> IO ()) -> IO Ctx
withCtxCopy (Ctx ctxB) f = Ctx `fmap` createCtx
where createCtx = create sizeCtx $ \dstPtr ->
withByteStringPtr ctxB $ \srcPtr -> do
memcopy64 (castPtr dstPtr) (castPtr srcPtr)
f (castPtr dstPtr)
withCtxThrow :: Ctx -> (Ptr Ctx -> IO a) -> IO a
withCtxThrow (Ctx ctxB) f =
allocaBytes sizeCtx $ \dstPtr ->
withByteStringPtr ctxB $ \srcPtr -> do
memcopy64 (castPtr dstPtr) (castPtr srcPtr)
f (castPtr dstPtr)
withCtxNew :: (Ptr Ctx -> IO ()) -> IO Ctx
withCtxNew f = Ctx `fmap` create sizeCtx (f . castPtr)
withCtxNewThrow :: (Ptr Ctx -> IO a) -> IO a
withCtxNewThrow f = allocaBytes sizeCtx (f . castPtr)
foreign import ccall unsafe "whirlpool.h whirlpool_init"
c_whirlpool_init :: Ptr Ctx -> IO ()
foreign import ccall "whirlpool.h whirlpool_update"
c_whirlpool_update :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
foreign import ccall unsafe "whirlpool.h whirlpool_finalize"
c_whirlpool_finalize :: Ptr Ctx -> Ptr Word8 -> IO ()
updateInternalIO :: Ptr Ctx -> ByteString -> IO ()
updateInternalIO ptr d =
unsafeUseAsCStringLen d (\(cs, len) -> c_whirlpool_update ptr (castPtr cs) (fromIntegral len))
finalizeInternalIO :: Ptr Ctx -> IO ByteString
finalizeInternalIO ptr =
create digestSize (c_whirlpool_finalize ptr)
init :: Ctx
init = inlinePerformIO $ withCtxNew $ c_whirlpool_init
update :: Ctx -> ByteString -> Ctx
update ctx d = inlinePerformIO $ withCtxCopy ctx $ \ptr -> updateInternalIO ptr d
finalize :: Ctx -> ByteString
finalize ctx = inlinePerformIO $ withCtxThrow ctx finalizeInternalIO
hash :: ByteString -> ByteString
hash d = inlinePerformIO $ withCtxNewThrow $ \ptr -> do
c_whirlpool_init ptr >> updateInternalIO ptr d >> finalizeInternalIO ptr
hashlazy :: L.ByteString -> ByteString
hashlazy l = inlinePerformIO $ withCtxNewThrow $ \ptr -> do
c_whirlpool_init ptr >> mapM_ (updateInternalIO ptr) (L.toChunks l) >> finalizeInternalIO ptr