From 7312ac25a4a89c603cc8311f442a000433b5301b Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sun, 15 Mar 2015 04:45:21 -0400
Subject: problem 2

---
 src/lib.rs   | 12 +++++++++++-
 tests/lib.rs |  8 ++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 5288655..f2e1508 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,19 @@
 extern crate "rustc-serialize" as serialize;
 
 use serialize::base64::{ToBase64,STANDARD};
-use serialize::hex::FromHex;
+use serialize::hex::{FromHex,ToHex};
 
 pub fn hex_to_base64 (hex: &str) -> String {
     let bytes = hex.from_hex().unwrap();
     return bytes.to_base64(STANDARD);
 }
+
+pub fn fixed_xor (str1: &str, str2: &str) -> String {
+    let bytes1 = str1.from_hex().unwrap();
+    let bytes2 = str2.from_hex().unwrap();
+    return bytes1.iter()
+        .zip(bytes2.iter())
+        .map(|(&a, &b)| { a ^ b })
+        .collect::<Vec<u8>>()
+        .to_hex();
+}
diff --git a/tests/lib.rs b/tests/lib.rs
index c2c79cc..0003696 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -6,3 +6,11 @@ fn problem_1 () {
     let base64 = "SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t";
     assert_eq!(matasano::hex_to_base64(hex), base64);
 }
+
+#[test]
+fn problem_2 () {
+    let str1 = "1c0111001f010100061a024b53535009181c";
+    let str2 = "686974207468652062756c6c277320657965";
+    let expected = "746865206b696420646f6e277420706c6179";
+    assert_eq!(matasano::fixed_xor(str1, str2), expected);
+}
-- 
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