001/*
002 * nimbus-jose-jwt
003 *
004 * Copyright 2012-2016, Connect2id Ltd and contributors.
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use
007 * this file except in compliance with the License. You may obtain a copy of the
008 * License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software distributed
013 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
014 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
015 * specific language governing permissions and limitations under the License.
016 */
017
018package com.nimbusds.jose.util;
019
020
021import javax.crypto.SecretKey;
022import javax.crypto.spec.SecretKeySpec;
023
024
025/**
026 * JCA key utilities.
027 *
028 * @author Vladimir Dzhuvinov
029 * @version 2018-02-11
030 */
031public class KeyUtils {
032        
033        
034        /**
035         * Returns the specified secret key as a secret key with its algorithm
036         * set to "AES".
037         *
038         * @param secretKey The secret key, {@code null} if not specified.
039         *
040         * @return The AES secret key, {@code null} if not specified.
041         */
042        public static SecretKey toAESKey(final SecretKey secretKey) {
043                
044                if (secretKey == null) {
045                        return null;
046                }
047                
048                return new SecretKeySpec(secretKey.getEncoded(), "AES");
049        }
050        
051        
052        /**
053         * Prevents public instantiation.
054         */
055        private KeyUtils() {}
056}