| /* |
| * 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.shiro.crypto; |
| |
| /** |
| * {@code CipherService} using the {@code Blowfish} cipher algorithm for all encryption, decryption, and key operations. |
| * <p/> |
| * The Blowfish algorithm can support key sizes between {@code 32} and {@code 448} bits<b>*</b>, inclusive. However, |
| * modern cryptanalysis techniques render keys of 80 bits or less mostly worthless - use {@code 128} or more whenever |
| * possible. |
| * <p/> |
| * Note that this class retains the parent class's default {@link OperationMode#CFB CFB} mode of operation |
| * instead of the typical JDK default of {@link OperationMode#ECB ECB}. {@code ECB} should not be used in |
| * security-sensitive environments because {@code ECB} does not allow for initialization vectors, which are |
| * considered necessary for strong encryption. See the {@link DefaultBlockCipherService parent class}'s JavaDoc and the |
| * {@link JcaCipherService JcaCipherService} JavaDoc for more on why the JDK default should not be used and is not |
| * used in this implementation. |
| * <p/> |
| * <b>*</b> Generating and using Blowfish key sizes greater than 128 require installation of the |
| * <a href="http://java.sun.com/javase/downloads/index.jsp">Java Cryptography Extension (JCE) Unlimited Strength |
| * Jurisdiction Policy files</a>. |
| * |
| * @since 1.0 |
| */ |
| public class BlowfishCipherService extends DefaultBlockCipherService { |
| |
| private static final String ALGORITHM_NAME = "Blowfish"; |
| private static final int BLOCK_SIZE = 64; |
| |
| /** |
| * Creates a new {@link CipherService} instance using the {@code Blowfish} cipher algorithm with the following |
| * important cipher default attributes: |
| * <table> |
| * <tr> |
| * <th>Attribute</th> |
| * <th>Value</th> |
| * </tr> |
| * <tr> |
| * <td>{@link #setKeySize keySize}</td> |
| * <td>{@code 128} bits</td> |
| * </tr> |
| * <tr> |
| * <td>{@link #setBlockSize blockSize}</td> |
| * <td>{@code 64} bits (required for {@code Blowfish})</td> |
| * </tr> |
| * <tr> |
| * <td>{@link #setMode mode}</td> |
| * <td>{@link OperationMode#CFB CFB}<b>*</b></td> |
| * </tr> |
| * <tr> |
| * <td>{@link #setPaddingScheme paddingScheme}</td> |
| * <td>{@link PaddingScheme#PKCS5 PKCS5}</td> |
| * </tr> |
| * <tr> |
| * <td>{@link #setInitializationVectorSize(int) initializationVectorSize}</td> |
| * <td>{@code 64} bits</td> |
| * </tr> |
| * <tr> |
| * <td>{@link #setGenerateInitializationVectors(boolean) generateInitializationVectors}</td> |
| * <td>{@code true}<b>**</b></td> |
| * </tr> |
| * </table> |
| * <p/> |
| * <b>*</b> The {@link OperationMode#CFB CFB} operation mode is used instead of the JDK default {@code ECB} to |
| * ensure strong encryption. {@code ECB} should not be used in security-sensitive environments - see the |
| * {@link DefaultBlockCipherService DefaultBlockCipherService} class JavaDoc's "Operation Mode" section |
| * for more. |
| * <p/> |
| * <b>**</b>In conjunction with the default {@code CFB} operation mode, initialization vectors are generated by |
| * default to ensure strong encryption. See the {@link JcaCipherService JcaCipherService} class JavaDoc for more. |
| */ |
| public BlowfishCipherService() { |
| super(ALGORITHM_NAME); |
| setInitializationVectorSize(BLOCK_SIZE); //like most block ciphers, the IV size is the same as the block size |
| } |
| } |