From 2c2ff16986b4d8e0965a88a49e829dbaaa316369 Mon Sep 17 00:00:00 2001
From: Paul Lietar <paul@lietar.net>
Date: Sat, 2 Jan 2016 13:30:01 +0100
Subject: [PATCH] discovery: Truncate the AES key to 128

The computed key is 20 bytes long (SHA1 checksum), but it used for AES128.
The last 4 bytes should therefore be dropped.
---
 src/discovery.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/discovery.rs b/src/discovery.rs
index bc1528b..a720dfe 100644
--- a/src/discovery.rs
+++ b/src/discovery.rs
@@ -100,7 +100,7 @@ impl DiscoveryManager {
 
         let decrypted = {
             let mut data = vec![0u8; encrypted.len()];
-            let mut cipher = crypto::aes::ctr(crypto::aes::KeySize::KeySize128, &encryption_key, &iv);
+            let mut cipher = crypto::aes::ctr(crypto::aes::KeySize::KeySize128, &encryption_key[0..16], &iv);
             cipher.process(&encrypted, &mut data);
             String::from_utf8(data).unwrap()
         };