Compute MD5 digest of file in Haskell

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不知归路
不知归路 2021-01-11 23:55

Using Haskell, how can I compute the MD5 digest of a file without using external tools like md5sum?

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  •  醉梦人生
    2021-01-12 00:01

    Another option would be using cryptohash which is based on a C implementation and also provides other hashes algorithms like SHA1:

    import qualified Data.ByteString.Lazy as LB
    import Crypto.Hash
    
    md5 :: LB.ByteString -> Digest MD5
    md5 = hashlazy
    
    main :: IO ()
    main = do
        fileContent <- LB.readFile "foo.txt"
        let md5Digest = md5 fileContent
        print $ digestToHexByteString md5Digest
    

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