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-----------------------------------------------------------------------------
-- |
-- 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 <http://web.comlab.ox.ac.uk/oucl/work/ian.lynagh/>
-- and <http://www.ietf.org/rfc/rfc1321.txt>.
--
-----------------------------------------------------------------------------
module Data.Digest.MD5 (
-- * Function Types
hash) where
import Data.Digest.MD5Aux
import Codec.Utils
import Data.Char(chr)
import Data.List(unfoldr)
import Numeric(readHex)
-- | 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:[])
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