From 200c8ff71a14003c1f231f4596c99d186eefe806 Mon Sep 17 00:00:00 2001
From: shimunn <shimun@shimun.net>
Date: Wed, 18 Sep 2019 02:59:49 +0200
Subject: [PATCH] warnings

---
 src/extensions/hmac.rs | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/src/extensions/hmac.rs b/src/extensions/hmac.rs
index 1a529d7..96abd2d 100644
--- a/src/extensions/hmac.rs
+++ b/src/extensions/hmac.rs
@@ -60,7 +60,8 @@ pub trait HmacExtension {
         let mut digest = Sha256::new();
         digest.input(input);
         digest.result(&mut salt);
-        self.get_hmac_assertion(credential, &salt, None).map(|secret| secret.0)
+        self.get_hmac_assertion(credential, &salt, None)
+            .map(|secret| secret.0)
     }
 }
 
@@ -85,16 +86,17 @@ impl HmacExtension for FidoDevice {
         let key_agreement = || {
             let mut cur = Cursor::new(Vec::new());
             let mut encoder = Encoder::new(&mut cur);
-            shared_secret
-                .public_key
-                .encode(&mut encoder).unwrap();
+            shared_secret.public_key.encode(&mut encoder).unwrap();
             cur.set_position(0);
             let mut dec = GenericDecoder::new(Config::default(), cur);
             dec.value()
         };
 
         let mut map = BTreeMap::new();
-        map.insert(Key::Int(Int::from_i64(0x01)), key_agreement().map_err(|_| FidoErrorKind::Io)?);
+        map.insert(
+            Key::Int(Int::from_i64(0x01)),
+            key_agreement().map_err(|_| FidoErrorKind::Io)?,
+        );
         map.insert(
             Key::Int(Int::from_i64(0x02)),
             Value::Bytes(Bytes::Bytes(
@@ -166,7 +168,7 @@ impl HmacExtension for FidoDevice {
         let shared_secret = self.shared_secret.as_ref().unwrap();
         let mut decryptor = shared_secret.decryptor();
         let mut hmac_secret_combined = [0u8; 64];
-        let mut output = RefWriteBuffer::new(&mut hmac_secret_combined);
+        let _output = RefWriteBuffer::new(&mut hmac_secret_combined);
         let hmac_secret_enc = match response
             .auth_data
             .extensions
@@ -184,11 +186,15 @@ impl HmacExtension for FidoDevice {
             _ => Err(FidoErrorKind::CborDecode),
         }?;
         let mut hmac_secret = ([0u8; 32], [0u8; 32]);
-        decryptor.decrypt(
-            &mut RefReadBuffer::new(&hmac_secret_enc),
-            &mut RefWriteBuffer::new(unsafe { std::mem::transmute::<_ ,&mut [u8; 64]>(&mut hmac_secret) }),
-            true,
-        );
+        decryptor
+            .decrypt(
+                &mut RefReadBuffer::new(&hmac_secret_enc),
+                &mut RefWriteBuffer::new(unsafe {
+                    std::mem::transmute::<_, &mut [u8; 64]>(&mut hmac_secret)
+                }),
+                true,
+            )
+            .expect("failed to decrypt secret");
         Ok((hmac_secret.0, salt2.map(|_| hmac_secret.1)))
     }
 }