Java tutorial
/* * Copyright (c) 2008-2011, Martijn Brinkers, Djigzo. * * This file is part of Djigzo email encryption. * * Djigzo is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License * version 3, 19 November 2007 as published by the Free Software * Foundation. * * Djigzo is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public * License along with Djigzo. If not, see <http://www.gnu.org/licenses/> * * Additional permission under GNU AGPL version 3 section 7 * * If you modify this Program, or any covered work, by linking or * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, * wsdl4j-1.6.1.jar (or modified versions of these libraries), * containing parts covered by the terms of Eclipse Public License, * tyrex license, freemarker license, dom4j license, mx4j license, * Spice Software License, Common Development and Distribution License * (CDDL), Common Public License (CPL) the licensors of this Program grant * you additional permission to convey the resulting work. */ package mitm.common.security.crypto; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStream; import org.apache.commons.lang.SerializationException; /** * The PBEncryptedOutputStreamParameters is used to store the relevant info for the Password Based Encryption (PBE) classes. * When something is encrypted using PBE, in order to decrypt we need to have access to the salt and iteration * count. * * @author Martijn Brinkers * */ public class PBEncryptedStreamParameters { private static final long serialVersionUID = -8617451983656008567L; private String algorithm; private byte[] salt; private int iterationCount; protected PBEncryptedStreamParameters(String algorithm, byte[] salt, int iterationCount) { this.algorithm = algorithm; this.salt = salt; this.iterationCount = iterationCount; } /** * Creates a PBEncryptionParameters from the encoded form. */ protected PBEncryptedStreamParameters(InputStream input) throws IOException { fromInputStream(input); } public String getAlgorithm() { return algorithm; } public byte[] getSalt() { return salt; } public int getIterationCount() { return iterationCount; } /** * Returns the encoded form of PBEncryptionParameters. */ public byte[] getEncoded() throws IOException { ByteArrayOutputStream bos = new ByteArrayOutputStream(); DataOutputStream out = new DataOutputStream(bos); out.writeLong(serialVersionUID); out.writeUTF(algorithm); out.writeInt(salt.length); out.write(salt); out.writeInt(iterationCount); return bos.toByteArray(); } private void fromInputStream(InputStream input) throws IOException { DataInputStream dis = new DataInputStream(input); long version = dis.readLong(); if (version != serialVersionUID) { throw new SerializationException("Version expected '" + serialVersionUID + "' but got '" + version); } algorithm = dis.readUTF(); int saltSize = dis.readInt(); this.salt = new byte[saltSize]; dis.readFully(salt); this.iterationCount = dis.readInt(); } }