diff --git a/card-functionality/src/tests.rs b/card-functionality/src/tests.rs
index 54dac2d..f22aefb 100644
--- a/card-functionality/src/tests.rs
+++ b/card-functionality/src/tests.rs
@@ -409,7 +409,7 @@ pub fn test_cardholder_cert(
     let data = "Foo bar baz!".as_bytes();
 
     match ca.set_cardholder_certificate(data.to_vec()) {
-        Ok(resp) => out.push(TestResult::Text("set cert ok".to_string())),
+        Ok(_resp) => out.push(TestResult::Text("set cert ok".to_string())),
         Err(e) => {
             out.push(TestResult::Text(format!(
                 "set_cardholder_certificate: {:?}",
@@ -433,7 +433,7 @@ pub fn test_cardholder_cert(
     // try using slot 2
 
     match ca.select_data(2, &[0x7F, 0x21]) {
-        Ok(res) => out.push(TestResult::Text("select_data ok".to_string())),
+        Ok(_res) => out.push(TestResult::Text("select_data ok".to_string())),
         Err(e) => {
             out.push(TestResult::Text(format!("select_data: {:?}", e)));
             return Ok(out);
@@ -639,7 +639,7 @@ pub fn test_reset_retry_counter(
 
     println!("reset retry counter");
     // ca.reset_retry_counter_pw1("abcdef".as_bytes().to_vec(), None)?;
-    let res = ca.reset_retry_counter_pw1(
+    let _res = ca.reset_retry_counter_pw1(
         "abcdef".as_bytes().to_vec(),
         Some("abcdefgh".as_bytes().to_vec()),
     );
diff --git a/openpgp-card-sequoia/src/card.rs b/openpgp-card-sequoia/src/card.rs
index 1dbd718..ff5ef4a 100644
--- a/openpgp-card-sequoia/src/card.rs
+++ b/openpgp-card-sequoia/src/card.rs
@@ -154,14 +154,6 @@ impl<'a> Open<'a> {
 
     // --- application data ---
 
-    /// Load "application related data".
-    ///
-    /// This is done once, after opening the OpenPGP card applet
-    /// (the data is stored in the OpenPGPCard object).
-    fn application_related_data(&mut self) -> Result<ApplicationRelatedData> {
-        self.card_app.get_application_related_data()
-    }
-
     pub fn application_identifier(
         &self,
     ) -> Result<ApplicationIdentifier, Error> {
@@ -178,10 +170,12 @@ impl<'a> Open<'a> {
         self.ard.get_extended_length_information()
     }
 
+    #[allow(dead_code)]
     fn general_feature_management() -> Option<bool> {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn discretionary_data_objects() {
         unimplemented!()
     }
@@ -205,6 +199,7 @@ impl<'a> Open<'a> {
         self.ard.get_fingerprints()
     }
 
+    #[allow(dead_code)]
     fn ca_fingerprints(&self) {
         unimplemented!()
     }
@@ -215,22 +210,27 @@ impl<'a> Open<'a> {
         self.ard.get_key_generation_times()
     }
 
+    #[allow(dead_code)]
     fn key_information() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn uif_pso_cds() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn uif_pso_dec() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn uif_pso_aut() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn uif_attestation() {
         unimplemented!()
     }
diff --git a/openpgp-card-sequoia/src/decryptor.rs b/openpgp-card-sequoia/src/decryptor.rs
index 08f412e..b7188dd 100644
--- a/openpgp-card-sequoia/src/decryptor.rs
+++ b/openpgp-card-sequoia/src/decryptor.rs
@@ -164,14 +164,13 @@ impl<'a> DecryptionHelper for CardDecryptor<'a> {
         for pkesk in pkesks {
             // Only attempt decryption if the KeyIDs match
             // (this check is an optimization)
-            if pkesk.recipient() == &self.public.keyid() {
-                if pkesk
+            if pkesk.recipient() == &self.public.keyid()
+                && pkesk
                     .decrypt(self, sym_algo)
                     .map(|(algo, session_key)| dec_fn(algo, &session_key))
                     .unwrap_or(false)
-                {
-                    return Ok(Some(self.public.fingerprint()));
-                }
+            {
+                return Ok(Some(self.public.fingerprint()));
             }
         }
 
diff --git a/openpgp-card-sequoia/src/privkey.rs b/openpgp-card-sequoia/src/privkey.rs
index 6990248..a67b95c 100644
--- a/openpgp-card-sequoia/src/privkey.rs
+++ b/openpgp-card-sequoia/src/privkey.rs
@@ -141,6 +141,7 @@ struct SqRSA {
 }
 
 impl SqRSA {
+    #[allow(clippy::many_single_char_names)]
     fn new(
         e: MPI,
         d: ProtectedMPI,
diff --git a/openpgp-card/src/card_app.rs b/openpgp-card/src/card_app.rs
index 1e665ed..745c89e 100644
--- a/openpgp-card/src/card_app.rs
+++ b/openpgp-card/src/card_app.rs
@@ -129,26 +129,32 @@ impl CardApp {
         Ok(resp.data()?.to_vec())
     }
 
+    #[allow(dead_code)]
     fn get_ca_fingerprints() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn get_key_information() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn get_uif_pso_cds() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn get_uif_pso_dec() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn get_uif_pso_aut() {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn get_uif_attestation() {
         unimplemented!()
     }
diff --git a/openpgp-card/src/card_do.rs b/openpgp-card/src/card_do.rs
index 47e5ca7..44f8f90 100644
--- a/openpgp-card/src/card_do.rs
+++ b/openpgp-card/src/card_do.rs
@@ -77,10 +77,12 @@ impl ApplicationRelatedData {
         }
     }
 
+    #[allow(dead_code)]
     fn get_general_feature_management() -> Option<bool> {
         unimplemented!()
     }
 
+    #[allow(dead_code)]
     fn get_discretionary_data_objects() {
         unimplemented!()
     }
diff --git a/openpgp-card/src/keys.rs b/openpgp-card/src/keys.rs
index 980a8d1..bdbb513 100644
--- a/openpgp-card/src/keys.rs
+++ b/openpgp-card/src/keys.rs
@@ -410,9 +410,11 @@ fn rsa_key_import_cmd(
 
     // Push e, padded with zero bytes from the left
     let e_as_bytes = rsa_key.get_e();
-    for _ in e_as_bytes.len()..(len_e_bytes as usize) {
-        key_data.push(0);
+
+    if len_e_bytes as usize > e_as_bytes.len() {
+        key_data.extend(vec![0; len_e_bytes as usize - e_as_bytes.len()]);
     }
+
     key_data.extend(e_as_bytes);
 
     // -- Prime1: p + Prime2: q --