diff --git a/src/pkiutil.rs b/src/pkiutil.rs
index 57bf25f..7c0e0ce 100644
--- a/src/pkiutil.rs
+++ b/src/pkiutil.rs
@@ -1,25 +1,15 @@
+use openpgp_card::crypto_data::PublicKeyMaterial;
 use openssl::bn::BigNum;
 use openssl::rsa::Rsa;
 use pem::Pem;
 use sequoia_openpgp::crypto::mpi::PublicKey;
-use openpgp_card::crypto_data::PublicKeyMaterial;
 
 use crate::digest::sha256_bytes;
 
 pub fn sequoia_openpgp_public_key_pem(public_key: &PublicKey) -> Option<(Vec<u8>, String)> {
     match public_key {
         PublicKey::RSA { e, n } => {
-            let rsa_pub_key = Rsa::from_public_components(
-                BigNum::from_slice(n.value()).unwrap(),
-                BigNum::from_slice(e.value()).unwrap(),
-            );
-            let rsa_pub_key_bytes = rsa_pub_key.unwrap().public_key_to_der().unwrap();
-            let rsa_pub_key_bytes_sha256 = sha256_bytes(&rsa_pub_key_bytes);
-            let pub_key_pem_obj = Pem {
-                tag: String::from("PUBLIC KEY"),
-                contents: rsa_pub_key_bytes,
-            };
-            Some((rsa_pub_key_bytes_sha256, pem::encode(&pub_key_pem_obj)))
+            Some(internal_rsa_public_key_pem(n.value(), e.value()))
         }
         _ => {
             warning!("Not RSA public key: {:?}", public_key);
@@ -31,17 +21,7 @@ pub fn sequoia_openpgp_public_key_pem(public_key: &PublicKey) -> Option<(Vec<u8>
 pub fn openpgp_card_public_key_pem(public_key: &PublicKeyMaterial) -> Option<(Vec<u8>, String)> {
     match public_key {
         PublicKeyMaterial::R(rsa_pub) => {
-            let rsa_pub_key = Rsa::from_public_components(
-                BigNum::from_slice(rsa_pub.n()).unwrap(),
-                BigNum::from_slice(rsa_pub.v()).unwrap(),
-            );
-            let rsa_pub_key_bytes = rsa_pub_key.unwrap().public_key_to_der().unwrap();
-            let rsa_pub_key_bytes_sha256 = sha256_bytes(&rsa_pub_key_bytes);
-            let pub_key_pem_obj = Pem {
-                tag: String::from("PUBLIC KEY"),
-                contents: rsa_pub_key_bytes,
-            };
-            Some((rsa_pub_key_bytes_sha256, pem::encode(&pub_key_pem_obj)))
+            Some(internal_rsa_public_key_pem(rsa_pub.n(), rsa_pub.v()))
         }
         _ => {
             warning!("Not RSA public key: {:?}", public_key);
@@ -49,3 +29,17 @@ pub fn openpgp_card_public_key_pem(public_key: &PublicKeyMaterial) -> Option<(Ve
         }
     }
 }
+
+fn internal_rsa_public_key_pem(n: &[u8], e: &[u8]) -> (Vec<u8>, String) {
+    let rsa_pub_key = Rsa::from_public_components(
+        BigNum::from_slice(n).unwrap(),
+        BigNum::from_slice(e).unwrap(),
+    );
+    let rsa_pub_key_bytes = rsa_pub_key.unwrap().public_key_to_der().unwrap();
+    let rsa_pub_key_bytes_sha256 = sha256_bytes(&rsa_pub_key_bytes);
+    let pub_key_pem_obj = Pem {
+        tag: String::from("PUBLIC KEY"),
+        contents: rsa_pub_key_bytes,
+    };
+    (rsa_pub_key_bytes_sha256, pem::encode(&pub_key_pem_obj))
+}