88 lines
2.6 KiB
Haskell
88 lines
2.6 KiB
Haskell
-- |
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-- Module : Crypto.Hash.Internal.MD4
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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 MD4 bindings
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--
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{-# LANGUAGE ForeignFunctionInterface #-}
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module Crypto.Hash.Internal.MD4
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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 Crypto.Internal.ByteArray (ByteArrayAccess, ByteArray)
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import qualified Crypto.Internal.ByteArray as B
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import Data.Word
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import Crypto.Internal.Memory
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newtype Ctx = Ctx Bytes
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{-# INLINE digestSize #-}
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digestSize :: Int
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digestSize = 16
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{-# INLINE sizeCtx #-}
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sizeCtx :: Int
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sizeCtx = 96
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withCtxCopy :: Ctx -> (Ptr Ctx -> IO ()) -> IO Ctx
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withCtxCopy (Ctx b) f = Ctx `fmap` bytesCopyAndModify b f
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withCtxThrow :: Ctx -> (Ptr Ctx -> IO a) -> IO a
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withCtxThrow (Ctx b) f = bytesCopyTemporary b f
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withCtxNewThrow :: (Ptr Ctx -> IO a) -> IO a
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withCtxNewThrow f = bytesTemporary 96 f
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foreign import ccall unsafe "cryptonite_md4.h cryptonite_md4_init"
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c_md4_init :: Ptr Ctx -> IO ()
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foreign import ccall "cryptonite_md4.h cryptonite_md4_update"
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c_md4_update :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_md4.h cryptonite_md4_update"
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c_md4_update_unsafe :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_md4.h cryptonite_md4_finalize"
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c_md4_finalize :: Ptr Ctx -> Ptr Word8 -> IO ()
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internalInitAt :: Ptr Ctx -> IO ()
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internalInitAt = c_md4_init
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-- | init a context
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internalInit :: IO Ctx
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internalInit = Ctx `fmap` bytesAlloc 96 internalInitAt
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-- | Update a context in place
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internalUpdate :: ByteArrayAccess ba => Ptr Ctx -> ba -> IO ()
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internalUpdate ptr d =
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B.withByteArray d $ \cs -> c_md4_update ptr cs (fromIntegral $ B.length d)
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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 :: ByteArrayAccess ba => Ptr Ctx -> ba -> IO ()
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internalUpdateUnsafe ptr d =
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B.withByteArray d $ \cs -> c_md4_update_unsafe ptr cs (fromIntegral $ B.length d)
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-- | Finalize a context in place
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internalFinalize :: ByteArray output => Ptr Ctx -> IO output
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internalFinalize ptr = B.alloc digestSize (c_md4_finalize ptr)
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