Add symmetric encryption junit test

smack-openpgp-bouncycastle/src/test/java/org/jivesoftware/smackx/ox/bouncycastle/SymmetricEncryptionTest.java

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+/**
+ *
+ * Copyright 2018 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.jivesoftware.smackx.ox.bouncycastle;
+
+import static junit.framework.TestCase.assertTrue;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Random;
+
+import de.vanitasvitae.crypto.pgpainless.PGPainless;
+import de.vanitasvitae.crypto.pgpainless.algorithm.SymmetricKeyAlgorithm;
+import org.bouncycastle.openpgp.PGPDataValidationException;
+import org.bouncycastle.openpgp.PGPException;
+import org.junit.Test;
+
+public class SymmetricEncryptionTest extends OxTestSuite {
+
+    @Test
+    public void successfulEncryptionDecryption() throws IOException, PGPException {
+        byte[] data = new byte[5000];
+        new Random().nextBytes(data);
+
+        byte[] encrypted = PGPainless.encryptWithPassword(data, "Password".toCharArray(), SymmetricKeyAlgorithm.AES_256);
+        byte[] decrypted = PGPainless.decryptWithPassword(encrypted, "Password".toCharArray());
+
+        assertTrue(Arrays.equals(data, decrypted));
+    }
+
+    @Test(expected = PGPDataValidationException.class)
+    public void failingEncryptionDecryption() throws IOException, PGPException {
+        byte[] data = new byte[5000];
+        new Random().nextBytes(data);
+
+        byte[] encrypted = PGPainless.encryptWithPassword(data, "Password".toCharArray(), SymmetricKeyAlgorithm.AES_256);
+        byte[] decrypted = PGPainless.decryptWithPassword(encrypted, "Swordfish".toCharArray());
+    }
+}