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Evan Klitzke
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May 1, 2008
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module Main where | |||
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import Foreign | |||
import Data.Bits | |||
import Data.Char | |||
import Data.List | |||
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cipherText :: String | |||
cipherText = map chr $ read $ "[" ++ (unsafePerformIO $ readFile "cipher1.txt") ++ "]" | |||
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makePasswords :: String -> [String] | |||
makePasswords s | |||
| length s >= 3 = (take 3 s) : (makePasswords $ tail s) | |||
| otherwise = [] | |||
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makeNPerms :: Int -> [a] -> [[a]] | |||
makeNPerms 0 _ = [[]] | |||
makeNPerms n xs = [x:y | x <- xs, y <- makeNPerms (n-1) xs] | |||
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-- all of the possible passwords | |||
passwords :: [String] | |||
passwords = makeNPerms 3 "abcdefghijklmnopqrstuvwxyz" | |||
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-- decrypts a chunk of plaintext | |||
decryptChunk :: String -> String -> String | |||
decryptChunk key plain | |||
| lk > lp = decryptChunk' (take lp key) | |||
| otherwise = decryptChunk' key | |||
where | |||
decryptChunk' k = map chr [(ord x) `xor` (ord p) | x <- k | p <- plain] | |||
lk = length key | |||
lp = length plain | |||
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-- decrypt the cipher text with a string | |||
decrypt :: String -> String -> String | |||
decrypt key "" = "" | |||
decrypt key xs = ciphered ++ (decrypt key (drop (length ciphered) xs)) | |||
where | |||
ciphered = decryptChunk key xs | |||
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-- should rewrite to use foldr | |||
allPreds :: [(a -> Bool)] -> a -> Bool | |||
allPreds [] _ = True | |||
allPreds (p:ps) a = (p a) && (allPreds ps a) | |||
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containsWords :: (String, String) -> Bool | |||
containsWords (_, s) = allPreds [(\s -> x `isInfixOf` s) | x <- ["and", "the", "of", "with"]] s | |||
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trueKey = fst $ head $ filter containsWords [(p, decrypt p cipherText) | p <- passwords] | |||
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main = print $ sum $ map ord $ decrypt trueKey cipherText |
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