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Apache Commons Compress software 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.zip;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* Base class for all PKWare strong crypto extra headers.
*
* This base class acts as a marker so you know you can ignore all
* extra fields that extend this class if you are not interested in
* the meta data of PKWare strong encryption.
*
* Algorithm IDs - integer identifier of the encryption algorithm from
* the following range
*
*
* - 0x6601 - DES
* - 0x6602 - RC2 (version needed to extract < 5.2)
* - 0x6603 - 3DES 168
* - 0x6609 - 3DES 112
* - 0x660E - AES 128
* - 0x660F - AES 192
* - 0x6610 - AES 256
* - 0x6702 - RC2 (version needed to extract >= 5.2)
* - 0x6720 - Blowfish
* - 0x6721 - Twofish
* - 0x6801 - RC4
* - 0xFFFF - Unknown algorithm
*
*
* Hash Algorithms - integer identifier of the hash algorithm from the
* following range
*
*
* - 0x0000 - none
* - 0x0001 - CRC32
* - 0x8003 - MD5
* - 0x8004 - SHA1
* - 0x8007 - RIPEMD160
* - 0x800C - SHA256
* - 0x800D - SHA384
* - 0x800E - SHA512
*
*
* @since 1.11
*/
public abstract class PKWareExtraHeader implements ZipExtraField {
private final ZipShort headerId;
/**
* Extra field data in local file data - without Header-ID or length
* specifier.
*/
private byte[] localData;
/**
* Extra field data in central directory - without Header-ID or length
* specifier.
*/
private byte[] centralData;
protected PKWareExtraHeader(final ZipShort headerId) {
this.headerId = headerId;
}
/**
* Get the header id.
*
* @return the header id
*/
@Override
public ZipShort getHeaderId() {
return headerId;
}
/**
* Set the extra field data in the local file data - without Header-ID or
* length specifier.
*
* @param data
* the field data to use
*/
public void setLocalFileDataData(final byte[] data) {
localData = ZipUtil.copy(data);
}
/**
* Get the length of the local data.
*
* @return the length of the local data
*/
@Override
public ZipShort getLocalFileDataLength() {
return new ZipShort(localData != null ? localData.length : 0);
}
/**
* Get the local data.
*
* @return the local data
*/
@Override
public byte[] getLocalFileDataData() {
return ZipUtil.copy(localData);
}
/**
* Set the extra field data in central directory.
*
* @param data
* the data to use
*/
public void setCentralDirectoryData(final byte[] data) {
centralData = ZipUtil.copy(data);
}
/**
* Get the central data length. If there is no central data, get the local
* file data length.
*
* @return the central data length
*/
@Override
public ZipShort getCentralDirectoryLength() {
if (centralData != null) {
return new ZipShort(centralData.length);
}
return getLocalFileDataLength();
}
/**
* Get the central data.
*
* @return the central data if present, else return the local file data
*/
@Override
public byte[] getCentralDirectoryData() {
if (centralData != null) {
return ZipUtil.copy(centralData);
}
return getLocalFileDataData();
}
/**
* @param data
* the array of bytes.
* @param offset
* the source location in the data array.
* @param length
* the number of bytes to use in the data array.
* @see ZipExtraField#parseFromLocalFileData(byte[], int, int)
*/
@Override
public void parseFromLocalFileData(final byte[] data, final int offset, final int length) {
final byte[] tmp = new byte[length];
System.arraycopy(data, offset, tmp, 0, length);
setLocalFileDataData(tmp);
}
/**
* @param data
* the array of bytes.
* @param offset
* the source location in the data array.
* @param length
* the number of bytes to use in the data array.
* @see ZipExtraField#parseFromCentralDirectoryData(byte[], int, int)
*/
@Override
public void parseFromCentralDirectoryData(final byte[] data, final int offset, final int length) {
final byte[] tmp = new byte[length];
System.arraycopy(data, offset, tmp, 0, length);
setCentralDirectoryData(tmp);
if (localData == null) {
setLocalFileDataData(tmp);
}
}
/**
* Encryption algorithm.
*
* @since 1.11
*/
public enum EncryptionAlgorithm {
DES(0x6601),
RC2pre52(0x6602),
TripleDES168(0x6603),
TripleDES192(0x6609),
AES128(0x660E),
AES192(0x660F),
AES256(0x6610),
RC2(0x6702),
RC4(0x6801),
UNKNOWN(0xFFFF);
private final int code;
private static final Map codeToEnum;
static {
final Map cte = new HashMap<>();
for (final EncryptionAlgorithm method : values()) {
cte.put(method.getCode(), method);
}
codeToEnum = Collections.unmodifiableMap(cte);
}
/**
* private constructor for enum style class.
*/
EncryptionAlgorithm(final int code) {
this.code = code;
}
/**
* the algorithm id.
*
* @return the PKWare AlgorithmId
*/
public int getCode() {
return code;
}
/**
* Returns the EncryptionAlgorithm for the given code or null if the
* method is not known.
* @param code the code of the algorithm
* @return the EncryptionAlgorithm for the given code or null
* if the method is not known
*/
public static EncryptionAlgorithm getAlgorithmByCode(final int code) {
return codeToEnum.get(code);
}
}
/**
* Hash Algorithm
*
* @since 1.11
*/
public enum HashAlgorithm {
NONE(0),
CRC32(1),
MD5(0x8003),
SHA1(0x8004),
RIPEND160(0x8007),
SHA256(0x800C),
SHA384(0x800D),
SHA512(0x800E);
private final int code;
private static final Map codeToEnum;
static {
final Map cte = new HashMap<>();
for (final HashAlgorithm method : values()) {
cte.put(method.getCode(), method);
}
codeToEnum = Collections.unmodifiableMap(cte);
}
/**
* private constructor for enum style class.
*/
HashAlgorithm(final int code) {
this.code = code;
}
/**
* the hash algorithm ID.
*
* @return the PKWare hashAlg
*/
public int getCode() {
return code;
}
/**
* Returns the HashAlgorithm for the given code or null if the method is
* not known.
* @param code the code of the algorithm
* @return the HashAlgorithm for the given code or null
* if the method is not known
*/
public static HashAlgorithm getAlgorithmByCode(final int code) {
return codeToEnum.get(code);
}
}
}