MD5 Hex Representation in Haskell

hash.cabal

  build-depends:       base >= 4.7 && < 5
                     , base16-bytestring
                     , bytestring
                     , cryptohash-md5

hash.hs

import qualified Crypto.Hash.MD5 as MD5
import Data.ByteString.Base16 (encode)
import Data.ByteString.Char8 (pack, unpack)

-- |The 'hash' takes a string and returns the hexadecimal representation of its MD5 checksum
hash :: String -> String
hash = unpack . encode . MD5.hash . pack

I was working on Advent of Code 2017 and accidentally switched the URL to 2016 Day 5 where I spent some time setting up this utility function before I spotted my mistake...