dualcontrol.CryptoHandler.java Source code

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Here is the source code for dualcontrol.CryptoHandler.java

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/*
 * Source https://code.google.com/p/vellum by @evanxsummers
    
   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 dualcontrol;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.Socket;
import java.security.SecureRandom;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Logger;
import vellum.datatype.Nanos;

/**
 *
 * @author evan.summers
 */
public class CryptoHandler {
    static final int ivLength = Integer.getInteger("ivLength", 8);
    static final boolean enableGetKey = Boolean.getBoolean("enableGetKey");
    static final Logger logger = Logger.getLogger(CryptoHandler.class);
    DualControlKeyStoreSession dualControl;
    byte[] ivBytes;
    byte[] dataBytes;
    DataOutputStream dos;

    public void handle(DualControlKeyStoreSession dualControl, Socket socket) throws Exception {
        try {
            this.dualControl = dualControl;
            DataInputStream dis = new DataInputStream(socket.getInputStream());
            int length = dis.readShort();
            byte[] bytes = new byte[length];
            dis.readFully(bytes);
            String data = new String(bytes);
            String[] fields = data.split(":");
            String mode = fields[0];
            String alias = fields[1];
            this.dos = new DataOutputStream(socket.getOutputStream());
            if (mode.equals("GETKEY")) {
                if (enableGetKey) {
                    SecretKey key = dualControl.loadKey(alias);
                    dos.writeUTF(key.getAlgorithm());
                    write(key.getEncoded());
                }
            } else {
                cipher(mode, alias, fields[2], fields[3], fields[4]);
            }
        } finally {
            dos.close();
        }
    }

    public static String join(Object... args) {
        return Arrays.toString(args);
    }

    private void cipher(String mode, String alias, String transformation, String ivString, String dataString)
            throws Exception {
        logger.debug(join("cipher", alias, transformation, mode));
        SecretKey key = dualControl.loadKey(alias);
        logger.debug("keyalg " + key.getAlgorithm());
        Cipher cipher = Cipher.getInstance(transformation);
        logger.debug("mode " + mode);
        if (mode.equals("DECRYPT")) {
            this.ivBytes = Base64.decodeBase64(ivString);
            logger.debug("iv " + Base64.encodeBase64String(ivBytes));
            IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
            cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
            this.dataBytes = cipher.doFinal(Base64.decodeBase64(dataString));
            write(ivBytes, dataBytes);
        } else if (mode.equals("ENCRYPT")) {
            this.ivBytes = getIvBytes(ivString);
            logger.debug("iv " + Base64.encodeBase64String(ivBytes));
            IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
            long startTime = System.nanoTime();
            cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
            this.dataBytes = cipher.doFinal(dataString.getBytes());
            logger.info("encrypt time nanos " + Nanos.elapsed(startTime));
            write(ivBytes, dataBytes);
        }
    }

    private byte[] getIvBytes(String ivString) {
        if (ivString.length() > 2) {
            return Base64.decodeBase64(ivString);
        }
        int ivLength = Integer.parseInt(ivString);
        this.ivBytes = new byte[ivLength];
        new SecureRandom().nextBytes(ivBytes);
        return ivBytes;
    }

    private void write(byte[] ivBytes, byte[] dataBytes) throws Exception {
        write(ivBytes);
        write(dataBytes);
        logger.debug("ivBytes " + ivBytes.length);
        logger.debug("dataBytes " + dataBytes.length);
    }

    private void write(byte[] bytes) throws Exception {
        dos.writeShort(bytes.length);
        dos.write(bytes);
    }

}