content: /*
   * 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.cipher;
  
  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();
      }
  
  }
  