commit cc79208a8ce2242a74b4e00ac2841520c5b044d3
Author: Jared Tobin <jared@jtobin.ca>
Date: Fri, 16 Dec 2016 09:08:00 +1300
Initial commit.
Diffstat:
9 files changed, 557 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+rust_intro
+probs
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2016 Jared Tobin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
@@ -0,0 +1,5 @@
+# cryptopals
+
+Matasano's [cryptopals challenges](http://cryptopals.com/), implemented mainly
+in [Rust](https://www.rust-lang.org) and [Haskell](https://haskell-lang.org/).
+
diff --git a/src/data/s1c4.dat b/src/data/s1c4.dat
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diff --git a/src/s1c1.rs b/src/s1c1.rs
@@ -0,0 +1,18 @@
+extern crate rustc_serialize as serialize;
+
+// tips:
+//
+// always operate on raw bytes, never encoded strings
+// only use hex and base64 for pretty printing
+
+use serialize::base64::{self, ToBase64};
+use serialize::hex::FromHex;
+
+fn main() {
+ let input = "49276d206b696c6c696e6720796f757220627261696e206c696b652061207\
+ 06f69736f6e6f7573206d757368726f6f6d";
+
+ let result = input.from_hex().unwrap().to_base64(base64::STANDARD);
+
+ println!("{}", result);
+}
diff --git a/src/s1c2.rs b/src/s1c2.rs
@@ -0,0 +1,24 @@
+extern crate rustc_serialize;
+
+use rustc_serialize::hex::{ToHex, FromHex};
+
+fn fixed_xor(target: &str, partner: &str) -> String {
+ assert_eq!(target.len(), partner.len());
+
+ let mut l = target.from_hex().unwrap();
+ let r = partner.from_hex().unwrap();
+
+ for (lb, rb) in l.iter_mut().zip(r) { *lb ^= rb }
+
+ l.to_hex()
+}
+
+fn main() {
+ let left = "1c0111001f010100061a024b53535009181c";
+ let right = "686974207468652062756c6c277320657965";
+
+ let result = fixed_xor(left, right);
+
+ println!("{}", result);
+}
+
diff --git a/src/s1c3.hs b/src/s1c3.hs
@@ -0,0 +1,48 @@
+{-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+import Data.Bits
+import qualified Data.ByteString as B
+import qualified Data.ByteString.Char8 as B8
+import qualified Data.ByteString.Base16 as B16
+import qualified Data.Map.Strict as MS
+import GHC.Word
+
+hash :: B.ByteString
+hash = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"
+
+fromHex :: B.ByteString -> [Word8]
+fromHex = B.unpack . fst . B16.decode
+
+tally :: Ord a => [a] -> MS.Map a Int
+tally = loop MS.empty where
+ loop !acc [] = acc
+ loop !acc (x:xs) =
+ let nacc = case MS.lookup x acc of
+ Nothing -> MS.insert x 1 acc
+ Just _ -> MS.update (Just . succ) x acc
+ in loop nacc xs
+
+mostFrequent :: MS.Map a Int -> Maybe a
+mostFrequent ms = case MS.toList ms of
+ [] -> Nothing
+ ((k, v):xs) -> Just (loop k v xs)
+ where
+ loop mk _ [] = mk
+ loop mk mv ((k, v):xs) = case compare v mv of
+ GT -> loop k v xs
+ _ -> loop mk mv xs
+
+decrypt :: B8.ByteString -> B8.ByteString
+decrypt bs = case mostFrequent (tally bytes) of
+ Nothing -> bs
+ Just c ->
+ let xored = fmap (`xor` c) bytes
+ in B.pack xored
+ where
+ bytes = fromHex bs
+
+main :: IO ()
+main = do
+ B8.putStrLn hash
+ B8.putStrLn (decrypt hash)
diff --git a/src/s1c3.rs b/src/s1c3.rs
@@ -0,0 +1,54 @@
+extern crate rustc_serialize as serialize;
+
+use serialize::hex::FromHex;
+use std::collections::HashMap;
+use std::string::String;
+use std::vec::Vec;
+
+const HASH: &'static str =
+ "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
+
+fn decode(s: &str) -> Vec<u8> {
+ s.from_hex().unwrap()
+}
+
+fn tally(vec: Vec<u8>) -> HashMap<u8, u8> {
+ let mut hashmap = HashMap::new();
+
+ for byte in vec {
+ let count = hashmap.entry(byte).or_insert(0);
+ *count += 1;
+ }
+
+ hashmap
+}
+
+fn max_elem(hashmap: HashMap<u8, u8>) -> u8 {
+ let mut max = 0;
+ let mut max_index = 0;
+
+ for (byte, count) in hashmap.iter() {
+ if count > &max {
+ max = *count;
+ max_index = *byte;
+ }
+ }
+
+ max_index
+}
+
+fn main() {
+ let decoded = decode(HASH);
+ let tallied = tally(decoded);
+ let max = max_elem(tallied);
+
+ let mut i_am_a_rust_noob = decode(HASH);
+
+ for byte in i_am_a_rust_noob.iter_mut() { *byte ^= max; }
+
+ let decrypted = String::from_utf8(i_am_a_rust_noob).unwrap();
+ println!("{}", HASH);
+ println!("{}", decrypted);
+}
+
+
diff --git a/src/s1c4.hs b/src/s1c4.hs
@@ -0,0 +1,59 @@
+{-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+import Data.Bits
+import qualified Data.ByteString as B
+import qualified Data.ByteString.Char8 as B8
+import qualified Data.ByteString.Base16 as B16
+import qualified Data.Map.Strict as MS
+import GHC.Word
+
+fromHex :: B.ByteString -> [Word8]
+fromHex = B.unpack . fst . B16.decode
+
+tally :: Ord a => [a] -> MS.Map a Int
+tally = loop MS.empty where
+ loop !acc [] = acc
+ loop !acc (x:xs) =
+ let nacc = case MS.lookup x acc of
+ Nothing -> MS.insert x 1 acc
+ Just _ -> MS.update (Just . succ) x acc
+ in loop nacc xs
+
+mostFrequent :: MS.Map a Int -> Maybe (a, Int)
+mostFrequent ms = case MS.toList ms of
+ [] -> Nothing
+ ((k, v):xs) -> Just (loop k v xs)
+ where
+ loop mk mv [] = (mk, mv)
+ loop mk mv ((k, v):xs) = case compare v mv of
+ GT -> loop k v xs
+ _ -> loop mk mv xs
+
+decrypt :: B8.ByteString -> B8.ByteString
+decrypt bs = case mostFrequent (tally bytes) of
+ Nothing -> bs
+ Just (c, _) ->
+ let xored = filter printable $ fmap (`xor` c) bytes
+ in B.pack xored
+ where
+ bytes = fromHex bs
+ printable c = elem c [33..126]
+
+prune :: [B8.ByteString] -> [B8.ByteString]
+prune = filter highscoring where
+ highscoring string = case mostFrequent (tally (fromHex string)) of
+ Nothing -> False
+ Just (c, v) -> v > 4
+
+display :: B8.ByteString -> IO ()
+display string = do
+ B8.putStrLn string
+ B8.putStrLn (decrypt string)
+ B8.putStrLn mempty
+
+batchDecrypt :: FilePath -> IO ()
+batchDecrypt file = do
+ strings <- fmap B8.lines $ B.readFile file
+ mapM_ display (prune strings)
+
