solve Challenge 4 of Set 1

master
Thomas L 2017-02-20 22:49:09 +01:00
parent 8beb3262bc
commit 97c69baaf0
4 changed files with 491 additions and 0 deletions

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set1/detect_xor/4.txt Normal file
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107
set1/detect_xor/Cargo.lock generated Normal file
View File

@ -0,0 +1,107 @@
[root]
name = "detect_xor"
version = "0.1.0"
dependencies = [
"env_logger 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
"log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "aho-corasick"
version = "0.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "env_logger"
version = "0.3.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
"regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "kernel32-sys"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "libc"
version = "0.2.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "log"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "memchr"
version = "0.1.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
"memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
"regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
"thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
"utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "regex-syntax"
version = "0.3.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "rustc-serialize"
version = "0.3.22"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "thread-id"
version = "2.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
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]
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name = "thread_local"
version = "0.2.7"
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dependencies = [
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source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
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version = "0.2.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "winapi-build"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"

View File

@ -0,0 +1,9 @@
[package]
name = "detect_xor"
version = "0.1.0"
authors = ["Thomas Lindner <thomas.lindner@fau.de>"]
[dependencies]
log = "0.3.6"
env_logger = "0.3.4"
rustc-serialize = "0.3"

View File

@ -0,0 +1,48 @@
#[macro_use]
extern crate log;
extern crate env_logger;
extern crate rustc_serialize;
use rustc_serialize::hex::FromHex;
use std::io::{BufRead, stdin};
use std::iter::repeat;
fn score(plaintext: &Vec<u8>) -> u32 {
let ranking = [24, 7, 15, 17, 26, 11, 10, 19, 22, 4, 5, 16, 13,
21, 23, 8, 2, 18, 20, 25, 14, 6, 12, 3, 9, 1];
let mut score = 0;
for ch in plaintext.iter() {
if ch >= &97 && ch <= &122 {
score += ranking[(ch - 97) as usize];
}
}
score
}
fn main() {
env_logger::init().unwrap();
let stdin = stdin();
let mut maxscore = 0;
let mut decrypted: Vec<u8> = vec![];
for line in stdin.lock().lines().filter_map(|x| x.ok()) {
match line.from_hex() {
Ok(ciphertext) => {
for key in 0..0xff {
let plaintext: Vec<u8> = ciphertext.iter().zip(repeat(key)).map(|(c, k)| c ^ k).collect();
let s = score(&plaintext);
if s > maxscore {
maxscore = s;
decrypted = plaintext;
}
}
}
Err(e) => error!("{}", e)
}
}
match String::from_utf8(decrypted) {
Ok(s) => println!("{}", s),
Err(e) => error!("{}", e)
}
}