Merge branch 'pgpainless-fixMessageEncryptionMechanism'

Author: dghgit

pg/src/main/java/org/bouncycastle/openpgp/api/MessageEncryptionMechanism.java

@@ -53,7 +53,7 @@ public int getAeadAlgorithm()
     public static MessageEncryptionMechanism unencrypted()
     {
         int none = 0;
-        return new MessageEncryptionMechanism(EncryptedDataPacketType.SEIPDv1,
+        return new MessageEncryptionMechanism(null,
             SymmetricKeyAlgorithmTags.NULL, none);
     }
 

pg/src/test/java/org/bouncycastle/openpgp/api/test/OpenPGPMessageProcessorTest.java

@@ -86,6 +86,7 @@ protected void performTestWith(OpenPGPApi api)
 
         verifyMessageByRevokedKey(api);
         incompleteMessageProcessing(api);
+        processUnencryptedMessage(api);
     }
 
     private void roundtripUnarmoredPlaintextMessage(OpenPGPApi api)
@@ -712,6 +713,26 @@ private void incompleteMessageProcessing(OpenPGPApi api)
         isFalse(sig.isValid());
     }
 
+    private void processUnencryptedMessage(OpenPGPApi api)
+            throws PGPException, IOException
+    {
+        ByteArrayOutputStream bOut = new ByteArrayOutputStream();
+        OpenPGPMessageOutputStream mOut = api.signAndOrEncryptMessage()
+                .open(bOut);
+        mOut.write(PLAINTEXT);
+        mOut.close();
+
+        ByteArrayInputStream bIn = new ByteArrayInputStream(bOut.toByteArray());
+        OpenPGPMessageInputStream mIn = api.decryptAndOrVerifyMessage().process(bIn);
+        byte[] plain = Streams.readAll(mIn);
+        mIn.close();
+        isEncodingEqual(PLAINTEXT, plain);
+
+        OpenPGPMessageInputStream.Result result = mIn.getResult();
+        isTrue(result.getEncryptionMethod().equals(MessageEncryptionMechanism.unencrypted()));
+        isNull(result.getEncryptionMethod().getMode());
+    }
+
     private void testVerificationOfSEIPD1MessageWithTamperedCiphertext(OpenPGPApi api)
         throws IOException, PGPException
     {