de.schlichtherle.io.archive.zip.raes.ParanoidZipRaesDriver Maven / Gradle / Ivy
/*
* Copyright (C) 2006-2010 Schlichtherle IT Services
*
* Licensed 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 de.schlichtherle.io.archive.zip.raes;
import de.schlichtherle.crypto.io.raes.RaesKeyException;
import de.schlichtherle.crypto.io.raes.RaesOutputStream;
import de.schlichtherle.io.archive.Archive;
import de.schlichtherle.io.archive.spi.InputArchive;
import de.schlichtherle.io.archive.spi.OutputArchive;
import de.schlichtherle.io.archive.spi.TransientIOException;
import de.schlichtherle.io.archive.zip.JarInputArchive;
import java.io.IOException;
import java.io.OutputStream;
import javax.swing.Icon;
/**
* A paranoid archive driver which builds RAES encrypted ZIP files.
* This driver always checks the cipher text of input archive files
* using the RAES Message Authentication Code (MAC), which makes it slower than
* the {@link SafeZipRaesDriver} for archive files larger than 512 KB and
* may pause the client application on the first access to the archive file
* for a while if the file is large.
* Note that the CRC-32 value of the plain text ZIP file is never checked
* because this is made redundant by the MAC verification.
*
* In addition, this driver limits the number of concurrent entry output
* streams to one, so that writing unencrypted temporary files is inhibited.
*
* Instances of this class are immutable.
*
* @author Christian Schlichtherle
* @version $Id: ParanoidZipRaesDriver.java 06f3ba684701 2010/11/04 01:15:55 christian $
* @since TrueZIP 6.0
* @see SafeZipRaesDriver
*/
public class ParanoidZipRaesDriver extends AbstractZipRaesDriver {
private static final long serialVersionUID = 6373537182537867796L;
/**
* Equivalent to {@link #ParanoidZipRaesDriver(Icon, Icon, boolean, boolean, int)
* this(null, null, false, false, DEFAULT_LEVEL)}.
*/
public ParanoidZipRaesDriver() {
this(null, null, false, false, DEFAULT_LEVEL);
}
/**
* Equivalent to {@link #ParanoidZipRaesDriver(Icon, Icon, boolean, boolean, int)
* this(null, null, false, false, level)}.
*/
public ParanoidZipRaesDriver(int level) {
this(null, null, false, false, level);
}
/** Constructs a new paranoid ZIP.RAES driver. */
public ParanoidZipRaesDriver(
Icon openIcon,
Icon closedIcon,
boolean preambled,
boolean postambled,
final int level) {
super(openIcon, closedIcon, preambled, postambled, level, Long.MAX_VALUE);
}
/**
* This implementation calls {@link #getRaesParameters}, with which it
* initializes a new {@link RaesOutputStream}, and finally passes the
* resulting stream to
* {@link #createZipOutputArchive(Archive, OutputStream, ZipInputArchive)}.
*
* Note that this limits the number of concurrent output entry streams
* to one in order to inhibit writing unencrypted temporary files for
* buffering the written entries.
*/
public OutputArchive createOutputArchive(
final Archive archive,
final OutputStream out,
final InputArchive source)
throws IOException {
final RaesOutputStream ros;
try {
ros = RaesOutputStream.getInstance(out, getRaesParameters(archive));
} catch (RaesKeyException failure) {
throw new TransientIOException(failure);
}
return createZipOutputArchive(archive, ros, (JarInputArchive) source);
}
}