| /* |
| * 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; |
| |
| import javax.crypto.KeyGenerator; |
| import java.security.Key; |
| import java.security.NoSuchAlgorithmException; |
| |
| /** |
| * Base abstract class for supporting symmetric key cipher algorithms. |
| * |
| * @since 1.0 |
| */ |
| public abstract class AbstractSymmetricCipherService extends JcaCipherService { |
| |
| protected AbstractSymmetricCipherService(String algorithmName) { |
| super(algorithmName); |
| } |
| |
| /** |
| * Generates a new {@link java.security.Key Key} suitable for this CipherService's {@link #getAlgorithmName() algorithm} |
| * by calling {@link #generateNewKey(int) generateNewKey(128)} (uses a 128 bit size by default). |
| * |
| * @return a new {@link java.security.Key Key}, 128 bits in length. |
| */ |
| public Key generateNewKey() { |
| return generateNewKey(getKeySize()); |
| } |
| |
| /** |
| * Generates a new {@link Key Key} of the specified size suitable for this CipherService |
| * (based on the {@link #getAlgorithmName() algorithmName} using the JDK {@link javax.crypto.KeyGenerator KeyGenerator}. |
| * |
| * @param keyBitSize the bit size of the key to create |
| * @return the created key suitable for use with this CipherService |
| */ |
| public Key generateNewKey(int keyBitSize) { |
| KeyGenerator kg; |
| try { |
| kg = KeyGenerator.getInstance(getAlgorithmName()); |
| } catch (NoSuchAlgorithmException e) { |
| String msg = "Unable to acquire " + getAlgorithmName() + " algorithm. This is required to function."; |
| throw new IllegalStateException(msg, e); |
| } |
| kg.init(keyBitSize); |
| return kg.generateKey(); |
| } |
| |
| } |