| /* |
| * 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.processors.standard.util; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.nifi.processors.standard.EncryptContent; |
| import org.bouncycastle.bcpg.ArmoredOutputStream; |
| import org.bouncycastle.openpgp.PGPCompressedData; |
| import org.bouncycastle.openpgp.PGPCompressedDataGenerator; |
| import org.bouncycastle.openpgp.PGPEncryptedData; |
| import org.bouncycastle.openpgp.PGPEncryptedDataGenerator; |
| import org.bouncycastle.openpgp.PGPException; |
| import org.bouncycastle.openpgp.PGPLiteralData; |
| import org.bouncycastle.openpgp.PGPLiteralDataGenerator; |
| import org.bouncycastle.openpgp.operator.PGPKeyEncryptionMethodGenerator; |
| import org.bouncycastle.openpgp.operator.jcajce.JcePGPDataEncryptorBuilder; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.security.SecureRandom; |
| import java.util.Date; |
| import java.util.zip.Deflater; |
| |
| /** |
| * This class contains static utility methods to assist with common PGP operations. |
| */ |
| public class PGPUtil { |
| private static final Logger logger = LoggerFactory.getLogger(PGPUtil.class); |
| |
| public static final int BUFFER_SIZE = 65536; |
| public static final int BLOCK_SIZE = 4096; |
| |
| public static void encrypt(InputStream in, OutputStream out, String algorithm, String provider, int cipher, String filename, PGPKeyEncryptionMethodGenerator encryptionMethodGenerator) throws |
| IOException, PGPException { |
| if (StringUtils.isEmpty(algorithm)) { |
| throw new IllegalArgumentException("The algorithm must be specified"); |
| } |
| final boolean isArmored = EncryptContent.isPGPArmoredAlgorithm(algorithm); |
| OutputStream output = out; |
| if (isArmored) { |
| output = new ArmoredOutputStream(out); |
| } |
| |
| // Default value, do not allow null encryption |
| if (cipher == PGPEncryptedData.NULL) { |
| logger.warn("Null encryption not allowed; defaulting to AES-128"); |
| cipher = PGPEncryptedData.AES_128; |
| } |
| |
| try { |
| // TODO: Can probably hard-code provider to BC and remove one method parameter |
| PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator( |
| new JcePGPDataEncryptorBuilder(cipher).setWithIntegrityPacket(true).setSecureRandom(new SecureRandom()).setProvider(provider)); |
| |
| encryptedDataGenerator.addMethod(encryptionMethodGenerator); |
| |
| try (OutputStream encryptedOut = encryptedDataGenerator.open(output, new byte[BUFFER_SIZE])) { |
| PGPCompressedDataGenerator compressedDataGenerator = new PGPCompressedDataGenerator(PGPCompressedData.ZIP, Deflater.BEST_SPEED); |
| try (OutputStream compressedOut = compressedDataGenerator.open(encryptedOut, new byte[BUFFER_SIZE])) { |
| PGPLiteralDataGenerator literalDataGenerator = new PGPLiteralDataGenerator(); |
| try (OutputStream literalOut = literalDataGenerator.open(compressedOut, PGPLiteralData.BINARY, filename, new Date(), new byte[BUFFER_SIZE])) { |
| |
| final byte[] buffer = new byte[BLOCK_SIZE]; |
| int len; |
| while ((len = in.read(buffer)) > -1) { |
| literalOut.write(buffer, 0, len); |
| } |
| } |
| } |
| } |
| } finally { |
| if (isArmored) { |
| output.close(); |
| } |
| } |
| } |
| } |