cryptopals

commit 91d0db9973f11b6c292a2c9c99e67b68cb84d22a
parent c34984041c5a79bb1f85041dae20742db55f49e2
Author: Jared Tobin <jared@jtobin.ca>
Date:   Thu, 22 Dec 2016 22:42:51 +1300

Add repeating-key bin.

Diffstat:
A
etc/data/s1c5.txt
 | 
2
++
A
lib/repeating_key_xor/Cargo.lock
 | 
14
++++++++++++++
A
lib/repeating_key_xor/Cargo.toml
 | 
8
++++++++
A
lib/repeating_key_xor/src/main.rs
 | 
46
++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 70 insertions(+), 0 deletions(-)
diff --git a/etc/data/s1c5.txt b/etc/data/s1c5.txt
@@ -0,0 +1,2 @@
+Burning 'em, if you ain't quick and nimble
+I go crazy when I hear a cymbal
diff --git a/lib/repeating_key_xor/Cargo.lock b/lib/repeating_key_xor/Cargo.lock
@@ -0,0 +1,14 @@
+[root]
+name = "repeating_key_xor"
+version = "0.1.0"
+dependencies = [
+ "rustc-serialize 0.3.22 (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"
+
+[metadata]
+"checksum rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)" = "237546c689f20bb44980270c73c3b9edd0891c1be49cc1274406134a66d3957b"
diff --git a/lib/repeating_key_xor/Cargo.toml b/lib/repeating_key_xor/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "repeating_key_xor"
+version = "0.1.0"
+authors = ["Jared Tobin <jared@jtobin.ca>"]
+
+[dependencies]
+
+rustc-serialize = "0.3.0"
diff --git a/lib/repeating_key_xor/src/main.rs b/lib/repeating_key_xor/src/main.rs
@@ -0,0 +1,46 @@
+extern crate rustc_serialize as serialize;
+
+use serialize::hex::{ToHex};
+use std::env;
+use std::io::{self, Read};
+use std::string::String;
+use std::vec::Vec;
+
+fn repeating_key_xor(text: &str, key: &str) -> String {
+    let text_bytes = text.as_bytes();
+    let key_bytes  = key.as_bytes();
+
+    let mut xored: Vec<u8> = vec![0; text_bytes.len()];
+
+    for (idx, val) in text_bytes.iter().enumerate() {
+        let byte_idx   = idx % key_bytes.len();
+            xored[idx] = val ^ key_bytes[byte_idx];
+    }
+
+    xored.to_hex()
+}
+
+fn main() {
+    // deal with args
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() != 2 {
+        println!("USAGE: echo FOO | ./repeating_key_xor KEY");
+        return ()
+    }
+
+    let supplied_key = &args[1];
+
+    // deal with stdin
+    let mut buffer = String::new();
+
+    io::stdin().read_to_string(&mut buffer)
+        .expect("repeating_key_xor: bad input");
+
+    let xored = repeating_key_xor(&buffer, &supplied_key);
+
+    println!("original: \n{}", &buffer);
+    println!("xored with: {}", supplied_key);
+    println!("result: \n{}", xored);
+
+}