diff --git a/pgpainless-core/src/main/java/org/pgpainless/algorithm/EncryptionPurpose.java b/pgpainless-core/src/main/java/org/pgpainless/algorithm/EncryptionPurpose.kt
similarity index 74%
rename from pgpainless-core/src/main/java/org/pgpainless/algorithm/EncryptionPurpose.java
rename to pgpainless-core/src/main/java/org/pgpainless/algorithm/EncryptionPurpose.kt
index 5eda30c0..f7e5ce2d 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/algorithm/EncryptionPurpose.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/algorithm/EncryptionPurpose.kt
@@ -1,10 +1,10 @@
-// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
 //
 // SPDX-License-Identifier: Apache-2.0
 
-package org.pgpainless.algorithm;
+package org.pgpainless.algorithm
 
-public enum EncryptionPurpose {
+enum class EncryptionPurpose {
     /**
      * The stream will encrypt communication that goes over the wire.
      * E.g. EMail, Chat...
@@ -19,4 +19,4 @@ public enum EncryptionPurpose {
      * The stream will use keys with either flags to encrypt the data.
      */
     ANY
-}
+}
\ No newline at end of file