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import Data.Function (on)
import Data.Char (ord, chr)
import Data.Bits (xor)
import System (getArgs)
crypt :: FilePath -> String -> IO String
crypt filename key = do
text <- readFile filename
let code = map chr $ zipWith (xor `on` ord) text $ cycle key
return code
main = do
[filename,key] <- getArgs
encrypted <- crypt filename key
putStr encrypted
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