-----------------------------------------------------------------------------
-- |
-- Module : Data.Digest.MD5
-- Copyright : (c) Dominic Steinitz 2004
-- License : BSD-style (see the file ReadMe.tex)
--
-- Maintainer : dominic.steinitz@blueyonder.co.uk
-- Stability : experimental
-- Portability : portable
--
-- Takes the MD5 module supplied by Ian Lynagh and wraps it so it
-- takes [Octet] and returns [Octet] where the length of the result
-- is always 16.
-- See
-- and .
--
-----------------------------------------------------------------------------
module Network.HTTP.MD5 (
-- * Function Types
hash) where
import Data.Char(chr)
import Data.List(unfoldr)
import Numeric(readHex)
import Network.HTTP.MD5Aux
import Data.Word (Word8)
type Octet = Word8
-- | Take [Octet] and return [Octet] according to the standard.
-- The length of the result is always 16 octets or 128 bits as required
-- by the standard.
hash :: [Octet] -> [Octet]
hash xs =
unfoldr f $ md5s $ Str $ map (chr . fromIntegral) xs
where f :: String -> Maybe (Octet,String)
f [] =
Nothing
f (x:y:zs) =
Just (fromIntegral a,zs)
where [(a,_)] = readHex (x:y:[])