org.apache.commons.compress.archivers.sevenz.Coders Maven / Gradle / Ivy
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Apache Commons Compress defines an API for working with
compression and archive formats. These include bzip2, gzip, pack200,
LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* 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 org.apache.commons.compress.archivers.sevenz;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;
import org.tukaani.xz.LZMAInputStream;
class Coders {
static InputStream addDecoder(final InputStream is,
final Coder coder, final byte[] password) throws IOException {
for (final CoderId coderId : coderTable) {
if (Arrays.equals(coderId.method.getId(), coder.decompressionMethodId)) {
return coderId.coder.decode(is, coder, password);
}
}
throw new IOException("Unsupported compression method " +
Arrays.toString(coder.decompressionMethodId));
}
static OutputStream addEncoder(final OutputStream out, final SevenZMethod method,
final byte[] password) throws IOException {
for (final CoderId coderId : coderTable) {
if (coderId.method.equals(method)) {
return coderId.coder.encode(out, password);
}
}
throw new IOException("Unsupported compression method " + method);
}
static CoderId[] coderTable = new CoderId[] {
new CoderId(SevenZMethod.COPY, new CopyDecoder()),
new CoderId(SevenZMethod.LZMA, new LZMADecoder()),
new CoderId(SevenZMethod.LZMA2, new LZMA2Decoder()),
new CoderId(SevenZMethod.DEFLATE, new DeflateDecoder()),
new CoderId(SevenZMethod.BZIP2, new BZIP2Decoder()),
new CoderId(SevenZMethod.AES256SHA256, new AES256SHA256Decoder())
};
static class CoderId {
CoderId(SevenZMethod method, final CoderBase coder) {
this.method = method;
this.coder = coder;
}
final SevenZMethod method;
final CoderBase coder;
}
static abstract class CoderBase {
abstract InputStream decode(final InputStream in, final Coder coder,
byte[] password) throws IOException;
OutputStream encode(final OutputStream out, final byte[] password)
throws IOException {
throw new UnsupportedOperationException("method doesn't support writing");
}
}
static class CopyDecoder extends CoderBase {
@Override
InputStream decode(final InputStream in, final Coder coder,
byte[] password) throws IOException {
return in;
}
@Override
OutputStream encode(final OutputStream out, final byte[] password) {
return out;
}
}
static class LZMADecoder extends CoderBase {
@Override
InputStream decode(final InputStream in, final Coder coder,
byte[] password) throws IOException {
byte propsByte = coder.properties[0];
long dictSize = coder.properties[1];
for (int i = 1; i < 4; i++) {
dictSize |= (coder.properties[i + 1] << (8 * i));
}
if (dictSize > LZMAInputStream.DICT_SIZE_MAX) {
throw new IOException("Dictionary larger than 4GiB maximum size");
}
return new LZMAInputStream(in, -1, propsByte, (int) dictSize);
}
}
static class DeflateDecoder extends CoderBase {
@Override
InputStream decode(final InputStream in, final Coder coder, final byte[] password)
throws IOException {
return new InflaterInputStream(new DummyByteAddingInputStream(in),
new Inflater(true));
}
@Override
OutputStream encode(final OutputStream out, final byte[] password) {
return new DeflaterOutputStream(out, new Deflater(9, true));
}
}
static class BZIP2Decoder extends CoderBase {
@Override
InputStream decode(final InputStream in, final Coder coder, final byte[] password)
throws IOException {
return new BZip2CompressorInputStream(in);
}
@Override
OutputStream encode(final OutputStream out, final byte[] password)
throws IOException {
return new BZip2CompressorOutputStream(out);
}
}
static class AES256SHA256Decoder extends CoderBase {
@Override
InputStream decode(final InputStream in, final Coder coder,
final byte[] passwordBytes) throws IOException {
return new InputStream() {
private boolean isInitialized = false;
private CipherInputStream cipherInputStream = null;
private CipherInputStream init() throws IOException {
if (isInitialized) {
return cipherInputStream;
}
final int byte0 = 0xff & coder.properties[0];
final int numCyclesPower = byte0 & 0x3f;
final int byte1 = 0xff & coder.properties[1];
final int ivSize = ((byte0 >> 6) & 1) + (byte1 & 0x0f);
final int saltSize = ((byte0 >> 7) & 1) + (byte1 >> 4);
if (2 + saltSize + ivSize > coder.properties.length) {
throw new IOException("Salt size + IV size too long");
}
final byte[] salt = new byte[saltSize];
System.arraycopy(coder.properties, 2, salt, 0, saltSize);
final byte[] iv = new byte[16];
System.arraycopy(coder.properties, 2 + saltSize, iv, 0, ivSize);
if (passwordBytes == null) {
throw new IOException("Cannot read encrypted files without a password");
}
final byte[] aesKeyBytes;
if (numCyclesPower == 0x3f) {
aesKeyBytes = new byte[32];
System.arraycopy(salt, 0, aesKeyBytes, 0, saltSize);
System.arraycopy(passwordBytes, 0, aesKeyBytes, saltSize,
Math.min(passwordBytes.length, aesKeyBytes.length - saltSize));
} else {
final MessageDigest digest;
try {
digest = MessageDigest.getInstance("SHA-256");
} catch (NoSuchAlgorithmException noSuchAlgorithmException) {
IOException ioe = new IOException("SHA-256 is unsupported by your Java implementation");
ioe.initCause(noSuchAlgorithmException);
throw ioe;
// TODO: simplify when Compress requires Java 1.6
// throw new IOException("SHA-256 is unsupported by your Java implementation",
// noSuchAlgorithmException);
}
final byte[] extra = new byte[8];
for (long j = 0; j < (1L << numCyclesPower); j++) {
digest.update(salt);
digest.update(passwordBytes);
digest.update(extra);
for (int k = 0; k < extra.length; k++) {
++extra[k];
if (extra[k] != 0) {
break;
}
}
}
aesKeyBytes = digest.digest();
}
final SecretKey aesKey = new SecretKeySpec(aesKeyBytes, "AES");
try {
final Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, aesKey, new IvParameterSpec(iv));
cipherInputStream = new CipherInputStream(in, cipher);
isInitialized = true;
return cipherInputStream;
} catch (GeneralSecurityException generalSecurityException) {
IOException ioe = new IOException("Decryption error " +
"(do you have the JCE Unlimited Strength Jurisdiction Policy Files installed?)");
ioe.initCause(generalSecurityException);
throw ioe;
// TODO: simplify when Compress requires Java 1.6
// throw new IOException("Decryption error " +
// "(do you have the JCE Unlimited Strength Jurisdiction Policy Files installed?)",
// generalSecurityException);
}
}
@Override
public int read() throws IOException {
return init().read();
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
return init().read(b, off, len);
}
@Override
public void close() {
}
};
}
}
/**
* ZLIB requires an extra dummy byte.
*
* @see java.util.zip.Inflater#Inflater(boolean)
* @see org.apache.commons.compress.archivers.zip.ZipFile.BoundedInputStream
*/
private static class DummyByteAddingInputStream extends FilterInputStream {
private boolean addDummyByte = true;
private DummyByteAddingInputStream(InputStream in) {
super(in);
}
@Override
public int read() throws IOException {
int result = super.read();
if (result == -1 && addDummyByte) {
addDummyByte = false;
result = 0;
}
return result;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int result = super.read(b, off, len);
if (result == -1 && addDummyByte) {
addDummyByte = false;
b[off] = 0;
return 1;
}
return result;
}
}
}
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