diff --git a/src/internal.rs b/src/internal.rs
index 1df9429..44fac1d 100644
--- a/src/internal.rs
+++ b/src/internal.rs
@@ -79,6 +79,7 @@ impl Drop for DesKey {
 }
 
 /// Encrypt with DES key
+#[allow(clippy::trivially_copy_pass_by_ref)]
 pub fn des_encrypt(key: &DesKey, input: &[u8; DES_LEN_DES], output: &mut [u8; DES_LEN_DES]) {
     output.copy_from_slice(input);
     TdesEde3::new(GenericArray::from_slice(&key.0))
@@ -86,6 +87,7 @@ pub fn des_encrypt(key: &DesKey, input: &[u8; DES_LEN_DES], output: &mut [u8; DE
 }
 
 /// Decrypt with DES key
+#[allow(clippy::trivially_copy_pass_by_ref)]
 pub fn des_decrypt(key: &DesKey, input: &[u8; DES_LEN_DES], output: &mut [u8; DES_LEN_DES]) {
     output.copy_from_slice(input);
     TdesEde3::new(GenericArray::from_slice(&key.0))
diff --git a/src/yubikey.rs b/src/yubikey.rs
index 6aa238d..9f2e146 100644
--- a/src/yubikey.rs
+++ b/src/yubikey.rs
@@ -844,7 +844,7 @@ pub unsafe fn ykpiv_authenticate(
         des_encrypt(&mgm_key, &challenge, &mut response);
 
         // TODO(tarcieri): constant time comparison!
-        if response == &data[4..12] {
+        if response == data[4..12] {
             res = Ok(());
         } else {
             res = Err(ErrorKind::AuthenticationError);