From ea03c66400655cdb5d15e89172fd51042aeba006 Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Fri, 28 May 2021 23:20:25 +0200
Subject: [PATCH] Throw MissingDecryptionMethodException when missing
 decryption key or -passphrase

---
 .../DecryptionStreamFactory.java              |  3 +-
 .../MissingDecryptionMethodException.java     | 30 +++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 pgpainless-core/src/main/java/org/pgpainless/exception/MissingDecryptionMethodException.java

diff --git a/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStreamFactory.java b/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStreamFactory.java
index f9d302f5..978e951a 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStreamFactory.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStreamFactory.java
@@ -57,6 +57,7 @@ import org.pgpainless.algorithm.CompressionAlgorithm;
 import org.pgpainless.algorithm.StreamEncoding;
 import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
 import org.pgpainless.exception.MessageNotIntegrityProtectedException;
+import org.pgpainless.exception.MissingDecryptionMethodException;
 import org.pgpainless.exception.UnacceptableAlgorithmException;
 import org.pgpainless.implementation.ImplementationFactory;
 import org.pgpainless.key.OpenPgpV4Fingerprint;
@@ -272,7 +273,7 @@ public final class DecryptionStreamFactory {
         }
 
         if (decryptionKey == null) {
-            throw new PGPException("Decryption failed - No suitable decryption key or passphrase found");
+            throw new MissingDecryptionMethodException("Decryption failed - No suitable decryption key or passphrase found");
         }
 
         PublicKeyDataDecryptorFactory dataDecryptor = ImplementationFactory.getInstance()
diff --git a/pgpainless-core/src/main/java/org/pgpainless/exception/MissingDecryptionMethodException.java b/pgpainless-core/src/main/java/org/pgpainless/exception/MissingDecryptionMethodException.java
new file mode 100644
index 00000000..ee522425
--- /dev/null
+++ b/pgpainless-core/src/main/java/org/pgpainless/exception/MissingDecryptionMethodException.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2021 Paul Schaub.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.pgpainless.exception;
+
+import org.bouncycastle.openpgp.PGPException;
+
+/**
+ * Exception that is thrown when decryption fails due to a missing decryption key or decryption passphrase.
+ * This can happen when the user does not provide the right set of keys / the right password when decrypting
+ * a message.
+ */
+public class MissingDecryptionMethodException extends PGPException {
+
+    public MissingDecryptionMethodException(String message) {
+        super(message);
+    }
+}