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;
022
023
024/**
025 * JCA key utilities.
026 *
027 * @author Vladimir Dzhuvinov
028 * @version 2022-09-24
029 */
030public class KeyUtils {
031        
032        
033        /**
034         * Returns the specified secret key as a wrapped secret key with its
035         * algorithm set to "AES". If the input key algorithm is "AES" it is
036         * returned unmodified.
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 || secretKey.getAlgorithm().equals("AES")) {
045                        return secretKey;
046                }
047                
048                return new SecretKey() {
049                        @Override
050                        public String getAlgorithm() {
051                                return "AES";
052                        }
053                        
054                        
055                        @Override
056                        public String getFormat() {
057                                return secretKey.getFormat();
058                        }
059                        
060                        
061                        @Override
062                        public byte[] getEncoded() {
063                                return secretKey.getEncoded();
064                        }
065                };
066        }
067        
068        
069        /**
070         * Prevents public instantiation.
071         */
072        private KeyUtils() {}
073}