natural commented on a change in pull request #3594: NIFI-3833 Support for 
Encrypted Flow File Repositories
URL: https://github.com/apache/nifi/pull/3594#discussion_r323574842
 
 

 ##########
 File path: 
nifi-commons/nifi-write-ahead-log/src/main/java/org/apache/nifi/wali/SimpleCipherInputStream.java
 ##########
 @@ -0,0 +1,104 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.nifi.wali;
+
+import org.bouncycastle.crypto.io.CipherInputStream;
+import org.bouncycastle.crypto.modes.AEADBlockCipher;
+
+import javax.crypto.SecretKey;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * This class extends {@link CipherInputStream} with a static factory method 
for constructing
+ * an input stream with an AEAD block cipher.
+ */
+public class SimpleCipherInputStream extends CipherInputStream {
+    protected AEADBlockCipher cipher;
+
+    /**
+     * Constructs an {@link InputStream} from an existing {@link InputStream} 
and block cipher.
+     *
+     * @param in input stream to wrap.
+     * @param cipher block cipher, initialized for decryption.
+     */
+    public SimpleCipherInputStream(InputStream in, AEADBlockCipher cipher) {
+        super(in, cipher);
+        this.cipher = cipher;
+    }
+
+    /**
+     * Static factory for wrapping an input stream with a block cipher.
+     *
+     * NB:  this function eagerly reads the initial cipher values from the 
plain input stream before returning the cipher stream.
+     *
+     * @param in input stream to wrap.
+     * @param key cipher key.
+     * @return wrapped input stream.
+     * @throws IOException if the stream cannot be read eagerly, or if the 
cipher cannot be initialized.
+     */
+    public static InputStream wrapWithKey(InputStream in, SecretKey key) 
throws IOException {
+        if (key == null) {
+            return in;
+        }
+
+        if (in.markSupported()) {
+            in.mark(0);
+        }
+
+        // Read the marker, the iv, and the aad in the same order as they're 
written in the SimpleCipherOutputStream:
+        try {
+            final int marker = in.read();
+            if (marker != SimpleCipherUtil.MARKER_BYTE) {
+                if (in.markSupported()) {
+                    in.reset();
+                }
+                return in;
+            }
+
+            byte[] iv = new byte[SimpleCipherUtil.IV_BYTE_LEN];
+            int len = in.read(iv);
+            if (len != iv.length) {
+                throw new IOException("Could not read IV.");
+            }
+
+            byte[] aad = new byte[SimpleCipherUtil.AAD_BYTE_LEN];
+            len = in.read(aad);
+            if (len != aad.length) {
+                throw new IOException("Could not read AAD.");
+            }
+
+            AEADBlockCipher cipher = SimpleCipherUtil.initCipher(key, false, 
iv, aad);
+            return new SimpleCipherInputStream(in, cipher);
+
+        } catch (final IOException ignored) {
 
 Review comment:
   Ah, my bad for not using the specific exception.  The base class 
implementation throws `InvalidCipherTextIOException`, so I've updated the code 
to catch that + rethrow the `IOException`.

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