{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE ForeignFunctionInterface #-}
{-# LANGUAGE TypeFamilies #-}

-- |
-- Module      : Crypto.Hash.MD5
-- License     : BSD-style
-- Maintainer  : Vincent Hanquez <vincent@snarc.org>
-- Stability   : experimental
-- Portability : unknown
--
-- Module containing the binding functions to work with the
-- MD5 cryptographic hash.
module Crypto.Hash.MD5 (MD5 (..)) where

import Crypto.Hash.Types
import Data.Data
import Data.Word (Word32, Word8)
import Foreign.Ptr (Ptr)

-- | MD5 cryptographic hash algorithm
data MD5 = MD5
    deriving (Show, Data)

instance HashAlgorithm MD5 where
    type HashBlockSize MD5 = 64
    type HashDigestSize MD5 = 16
    type HashInternalContextSize MD5 = 96
    hashBlockSize _ = 64
    hashDigestSize _ = 16
    hashInternalContextSize _ = 96
    hashInternalInit = c_md5_init
    hashInternalUpdate = c_md5_update
    hashInternalFinalize = c_md5_finalize

instance HashAlgorithmPrefix MD5 where
    hashInternalFinalizePrefix = c_md5_finalize_prefix

foreign import ccall unsafe "crypton_md5_init"
    c_md5_init :: Ptr (Context a) -> IO ()

foreign import ccall "crypton_md5_update"
    c_md5_update :: Ptr (Context a) -> Ptr Word8 -> Word32 -> IO ()

foreign import ccall unsafe "crypton_md5_finalize"
    c_md5_finalize :: Ptr (Context a) -> Ptr (Digest a) -> IO ()

foreign import ccall "crypton_md5_finalize_prefix"
    c_md5_finalize_prefix
        :: Ptr (Context a) -> Ptr Word8 -> Word32 -> Word32 -> Ptr (Digest a) -> IO ()