001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.converter.stream;
018    
019    import java.security.GeneralSecurityException;
020    import java.security.Key;
021    import java.security.SecureRandom;
022    
023    import javax.crypto.Cipher;
024    import javax.crypto.KeyGenerator;
025    import javax.crypto.spec.IvParameterSpec;
026    
027    /**
028     * A class to hold a pair of encryption and decryption ciphers.
029     */
030    public class CipherPair {
031        private final String transformation;
032        private final Cipher enccipher;
033        private final Cipher deccipher;
034        
035        public CipherPair(String transformation) throws GeneralSecurityException {
036            this.transformation = transformation;
037            
038            int d = transformation.indexOf('/');
039            String a;
040            if (d > 0) {
041                a = transformation.substring(0, d);
042            } else {
043                a = transformation;
044            }
045    
046            KeyGenerator keygen = KeyGenerator.getInstance(a);
047            keygen.init(new SecureRandom());
048            Key key = keygen.generateKey();
049            enccipher = Cipher.getInstance(transformation);
050            deccipher = Cipher.getInstance(transformation);
051            enccipher.init(Cipher.ENCRYPT_MODE, key);
052            final byte[] ivp = enccipher.getIV();
053            deccipher.init(Cipher.DECRYPT_MODE, key, ivp == null ? null : new IvParameterSpec(ivp));
054        }
055        
056        public String getTransformation() {
057            return transformation;
058        }
059        
060        public Cipher getEncryptor() {
061            return enccipher;
062        }
063        
064        public Cipher getDecryptor() {
065            return deccipher;
066        }
067    }