001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.commons.compress.archivers.zip; 020 021import java.util.zip.ZipException; 022 023/** 024 * X.509 Certificate ID and Signature for central directory (0x0016). 025 * 026 * <p> 027 * This field contains the information about which certificate in the PKCS#7 store was used to sign the central directory structure. When the Central Directory 028 * Encryption feature is enabled for a ZIP file, this record will appear in the Archive Extra Data Record, otherwise it will appear in the first central 029 * directory record. 030 * </p> 031 * 032 * <p> 033 * Note: all fields stored in Intel low-byte/high-byte order. 034 * </p> 035 * 036 * <pre> 037 * Value Size Description 038 * ----- ---- ----------- 039 * (CDID) 0x0016 2 bytes Tag for this "extra" block type 040 * TSize 2 bytes Size of data that follows 041 * RCount 4 bytes Number of recipients. (inferred) 042 * HashAlg 2 bytes Hash algorithm identifier. (inferred) 043 * TData TSize Data 044 * </pre> 045 * 046 * @NotThreadSafe 047 * @since 1.11 048 */ 049public class X0016_CertificateIdForCentralDirectory extends PKWareExtraHeader { 050 051 static final ZipShort HEADER_ID = new ZipShort(0x0016); 052 053 private int rcount; 054 055 private HashAlgorithm hashAlg; 056 057 /** 058 * Constructs a new instance. 059 */ 060 public X0016_CertificateIdForCentralDirectory() { 061 super(HEADER_ID); 062 } 063 064 /** 065 * Gets hash algorithm. 066 * 067 * @return the hash algorithm 068 */ 069 public HashAlgorithm getHashAlgorithm() { 070 return hashAlg; 071 } 072 073 /** 074 * Gets record count. 075 * 076 * @return the record count 077 */ 078 public int getRecordCount() { 079 return rcount; 080 } 081 082 @Override 083 public void parseFromCentralDirectoryData(final byte[] data, final int offset, final int length) throws ZipException { 084 assertMinimalLength(4, length); 085 // TODO: double check we really do not want to call super here 086 this.rcount = ZipShort.getValue(data, offset); 087 this.hashAlg = HashAlgorithm.getAlgorithmByCode(ZipShort.getValue(data, offset + 2)); 088 } 089}