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 */
017package org.apache.camel.converter.stream;
018
019import java.security.GeneralSecurityException;
020import java.security.Key;
021import java.security.SecureRandom;
022
023import javax.crypto.Cipher;
024import javax.crypto.KeyGenerator;
025import javax.crypto.spec.IvParameterSpec;
026
027/**
028 * A class to hold a pair of encryption and decryption ciphers.
029 */
030public 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}