de.intarsys.pdf.crypt.SystemSecurityHandlerV1 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jpod Show documentation
This is a fork of http://sourceforge.net/projects/jpodlib/ as development seems to be frozen. We're providing some bug fixes along with deployments to maven.
There is a newer version: 2.0
Show newest version
/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.crypt;

import de.intarsys.pdf.cos.COSDictionary;
import de.intarsys.pdf.cos.COSObjectKey;

/**
 * The {@link ISystemSecurityHandler} implementing /V 1 of the PDF spec.
 * 
 * The crypt handler is created lazy and never changed - it is unwise to change
 * any encryption parameters afterwards!
 */
public class SystemSecurityHandlerV1 extends SystemSecurityHandler {

    private ICryptHandler cryptHandler;

    protected SystemSecurityHandlerV1(COSDictionary dict) {
        super(dict);
    }

    protected ICryptHandler createCryptHandler() throws COSSecurityException {
        ArcFourCryptHandler result = new ArcFourCryptHandler();
        result.initialize(getSecurityHandler().getCryptKey());
        return result;
    }

    protected byte[] decrypt(COSObjectKey objectKey, byte[] bytes) throws COSSecurityException {
        return getCryptHandler().decrypt(objectKey, bytes);
    }

    @Override
    public byte[] decryptFile(COSObjectKey key, COSDictionary dict, byte[] bytes) throws COSSecurityException {
        return decrypt(key, bytes);
    }

    @Override
    public byte[] decryptStream(COSObjectKey key, COSDictionary dict, byte[] bytes) throws COSSecurityException {
        return decrypt(key, bytes);
    }

    @Override
    public byte[] decryptString(COSObjectKey key, byte[] bytes) throws COSSecurityException {
        return decrypt(key, bytes);
    }

    protected byte[] encrypt(COSObjectKey objectKey, byte[] bytes) throws COSSecurityException {
        if (!isEnabled()) {
            return bytes;
        }
        return getCryptHandler().encrypt(objectKey, bytes);
    }

    @Override
    public byte[] encryptFile(COSObjectKey key, COSDictionary dict, byte[] bytes) throws COSSecurityException {
        return encrypt(key, bytes);
    }

    @Override
    public byte[] encryptStream(COSObjectKey key, COSDictionary dict, byte[] bytes) throws COSSecurityException {
        return encrypt(key, bytes);
    }

    @Override
    public byte[] encryptString(COSObjectKey key, byte[] bytes) throws COSSecurityException {
        return encrypt(key, bytes);
    }

    protected ICryptHandler getCryptHandler() throws COSSecurityException {
        if (cryptHandler == null) {
            cryptHandler = createCryptHandler();
        }
        return cryptHandler;
    }

    @Override
    public int getVersion() {
        return 1;
    }
}