b5dbc9caae
internalUpdateUnsafe, just like internalUpdate update the context, but does it using the unsafe key word for the ffi binding
114 lines
3.6 KiB
Haskell
114 lines
3.6 KiB
Haskell
{-# LANGUAGE ForeignFunctionInterface, CPP, MultiParamTypeClasses #-}
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-- |
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-- Module : Crypto.Hash.Internal.Tiger
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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 Tiger bindings
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--
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module Crypto.Hash.Internal.Tiger
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( Ctx(..)
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-- * Internal values
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, digestSize
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, sizeCtx
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-- * Internal IO hash functions
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, internalInit
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, internalInitAt
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, internalUpdate
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, internalUpdateUnsafe
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, internalFinalize
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-- * Context copy and creation
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, withCtxCopy
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, withCtxNewThrow
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, withCtxThrow
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) where
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import Foreign.Ptr
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import Foreign.ForeignPtr (withForeignPtr)
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import Foreign.Storable
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import Foreign.Marshal.Alloc
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import Data.ByteString (ByteString)
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import Data.ByteString.Unsafe (unsafeUseAsCStringLen)
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import Data.ByteString.Internal (create, toForeignPtr)
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import Data.Word
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newtype Ctx = Ctx ByteString
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{-# INLINE digestSize #-}
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digestSize :: Int
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digestSize = 24
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{-# INLINE sizeCtx #-}
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sizeCtx :: Int
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sizeCtx = 96
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{-# INLINE withByteStringPtr #-}
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withByteStringPtr :: ByteString -> (Ptr Word8 -> IO a) -> IO a
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withByteStringPtr b f =
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withForeignPtr fptr $ \ptr -> f (ptr `plusPtr` off)
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where (fptr, off, _) = toForeignPtr b
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{-# INLINE memcopy64 #-}
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memcopy64 :: Ptr Word64 -> Ptr Word64 -> IO ()
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memcopy64 dst src = mapM_ peekAndPoke [0..(12-1)]
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where peekAndPoke i = peekElemOff src i >>= pokeElemOff dst i
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withCtxCopy :: Ctx -> (Ptr Ctx -> IO ()) -> IO Ctx
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withCtxCopy (Ctx ctxB) f = Ctx `fmap` createCtx
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where createCtx = create sizeCtx $ \dstPtr ->
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withByteStringPtr ctxB $ \srcPtr -> do
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memcopy64 (castPtr dstPtr) (castPtr srcPtr)
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f (castPtr dstPtr)
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withCtxThrow :: Ctx -> (Ptr Ctx -> IO a) -> IO a
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withCtxThrow (Ctx ctxB) f =
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allocaBytes sizeCtx $ \dstPtr ->
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withByteStringPtr ctxB $ \srcPtr -> do
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memcopy64 (castPtr dstPtr) (castPtr srcPtr)
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f (castPtr dstPtr)
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withCtxNew :: (Ptr Ctx -> IO ()) -> IO Ctx
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withCtxNew f = Ctx `fmap` create sizeCtx (f . castPtr)
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withCtxNewThrow :: (Ptr Ctx -> IO a) -> IO a
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withCtxNewThrow f = allocaBytes sizeCtx (f . castPtr)
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foreign import ccall unsafe "cryptonite_tiger.h cryptonite_tiger_init"
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c_tiger_init :: Ptr Ctx -> IO ()
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foreign import ccall "cryptonite_tiger.h cryptonite_tiger_update"
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c_tiger_update :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_tiger.h cryptonite_tiger_update"
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c_tiger_update_unsafe :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_tiger.h cryptonite_tiger_finalize"
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c_tiger_finalize :: Ptr Ctx -> Ptr Word8 -> IO ()
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internalInitAt :: Ptr Ctx -> IO ()
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internalInitAt = c_tiger_init
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-- | init a context
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internalInit :: IO Ctx
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internalInit = withCtxNew internalInitAt
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-- | Update a context in place
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internalUpdate :: Ptr Ctx -> ByteString -> IO ()
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internalUpdate ptr d =
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unsafeUseAsCStringLen d (\(cs, len) -> c_tiger_update ptr (castPtr cs) (fromIntegral len))
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-- | Update a context in place using an unsafe foreign function call.
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--
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-- It is faster than `internalUpdate`, but will block the haskell runtime.
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-- This shouldn't be used if the input data is large.
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internalUpdateUnsafe :: Ptr Ctx -> ByteString -> IO ()
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internalUpdateUnsafe ptr d =
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unsafeUseAsCStringLen d (\(cs, len) -> c_tiger_update_unsafe ptr (castPtr cs) (fromIntegral len))
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-- | Finalize a context in place
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internalFinalize :: Ptr Ctx -> IO ByteString
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internalFinalize ptr = create digestSize (c_tiger_finalize ptr)
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