diff --git a/sop-java/src/main/java/sop/operation/DetachedVerify.java b/sop-java/src/main/java/sop/operation/DetachedVerify.java
deleted file mode 100644
index 9dee870..0000000
--- a/sop-java/src/main/java/sop/operation/DetachedVerify.java
+++ /dev/null
@@ -1,45 +0,0 @@
-// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
-//
-// SPDX-License-Identifier: Apache-2.0
-
-package sop.operation;
-
-import sop.exception.SOPGPException;
-
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-
-/**
- * API for verifying detached signatures.
- */
-public interface DetachedVerify extends AbstractVerify<DetachedVerify>, VerifySignatures {
-
-    /**
-     * Provides the detached signatures.
-     * @param signatures input stream containing encoded, detached signatures.
-     *
-     * @return builder instance
-     *
-     * @throws sop.exception.SOPGPException.BadData if the input stream does not contain OpenPGP signatures
-     * @throws IOException in case of an IO error
-     */
-    VerifySignatures signatures(InputStream signatures)
-            throws SOPGPException.BadData,
-            IOException;
-
-    /**
-     * Provides the detached signatures.
-     * @param signatures byte array containing encoded, detached signatures.
-     *
-     * @return builder instance
-     *
-     * @throws sop.exception.SOPGPException.BadData if the byte array does not contain OpenPGP signatures
-     * @throws IOException in case of an IO error
-     */
-    default VerifySignatures signatures(byte[] signatures)
-            throws SOPGPException.BadData,
-            IOException {
-        return signatures(new ByteArrayInputStream(signatures));
-    }
-}
diff --git a/sop-java/src/main/kotlin/sop/operation/DetachedVerify.kt b/sop-java/src/main/kotlin/sop/operation/DetachedVerify.kt
new file mode 100644
index 0000000..2dd9218
--- /dev/null
+++ b/sop-java/src/main/kotlin/sop/operation/DetachedVerify.kt
@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package sop.operation
+
+import java.io.ByteArrayInputStream
+import java.io.IOException
+import java.io.InputStream
+import sop.exception.SOPGPException.BadData
+
+interface DetachedVerify : AbstractVerify<DetachedVerify>, VerifySignatures {
+
+    /**
+     * Provides the detached signatures.
+     *
+     * @param signatures input stream containing encoded, detached signatures.
+     * @return builder instance
+     * @throws BadData if the input stream does not contain OpenPGP signatures
+     * @throws IOException in case of an IO error
+     */
+    @Throws(BadData::class, IOException::class)
+    fun signatures(signatures: InputStream): VerifySignatures
+
+    /**
+     * Provides the detached signatures.
+     *
+     * @param signatures byte array containing encoded, detached signatures.
+     * @return builder instance
+     * @throws BadData if the byte array does not contain OpenPGP signatures
+     * @throws IOException in case of an IO error
+     */
+    @Throws(BadData::class, IOException::class)
+    fun signatures(signatures: ByteArray): VerifySignatures =
+        signatures(ByteArrayInputStream(signatures))
+}