solve Challenge 3 of Set 1
Thomas L
parent
a5467c7293
commit
5b5c47fe15
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@ -0,0 +1,107 @@
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[root]
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name = "xor_cipher"
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version = "0.1.0"
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dependencies = [
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"env_logger 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
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"log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "aho-corasick"
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version = "0.5.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "env_logger"
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version = "0.3.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"regex 0.1.75 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "kernel32-sys"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "libc"
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version = "0.2.16"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "log"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "memchr"
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version = "0.1.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex"
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version = "0.1.75"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"aho-corasick 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
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"regex-syntax 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
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"thread_local 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.3.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "rustc-serialize"
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version = "0.3.19"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "thread-id"
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version = "2.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "thread_local"
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version = "0.2.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "utf8-ranges"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "winapi"
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version = "0.2.8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "winapi-build"
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version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -0,0 +1,9 @@
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[package]
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name = "xor_cipher"
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version = "0.1.0"
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authors = ["Thomas Lindner <thomas.lindner@fau.de>"]
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[dependencies]
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log = "0.3.6"
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env_logger = "0.3.4"
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rustc-serialize = "0.3"
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@ -0,0 +1,49 @@
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#[macro_use]
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extern crate log;
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extern crate env_logger;
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extern crate rustc_serialize;
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use rustc_serialize::hex::FromHex;
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use std::io::{BufRead, stdin};
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use std::iter::repeat;
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fn score(plaintext: &Vec<u8>) -> u32 {
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let ranking = [24, 7, 15, 17, 26, 11, 10, 19, 22, 4, 5, 16, 13,
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21, 23, 8, 2, 18, 20, 25, 14, 6, 12, 3, 9, 1];
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let mut score = 0;
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for ch in plaintext.iter() {
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if ch >= &97 && ch <= &122 {
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score += ranking[(ch - 97) as usize];
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}
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}
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score
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}
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fn main() {
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env_logger::init().unwrap();
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let stdin = stdin();
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for line in stdin.lock().lines().filter_map(|x| x.ok()) {
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match line.from_hex() {
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Ok(ciphertext) => {
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let mut maxscore = 0;
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let mut decrypted: Vec<u8> = vec![];
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for key in 0..0xff {
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let plaintext: Vec<u8> = ciphertext.iter().zip(repeat(key)).map(|(c, k)| c ^ k).collect();
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let s = score(&plaintext);
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if s > maxscore {
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maxscore = s;
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decrypted = plaintext;
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}
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}
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match String::from_utf8(decrypted) {
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Ok(s) => println!("{}", s),
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Err(e) => error!("{}", e)
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}
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}
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Err(e) => error!("{}", e)
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}
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}
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}
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