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 * http://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>This field contains the information about which certificate in the PKCS#7 027 * store was used to sign the central directory structure. When the Central 028 * Directory Encryption feature is enabled for a ZIP file, this record will 029 * appear in the Archive Extra Data Record, otherwise it will appear in the 030 * first central directory record.</p> 031 * 032 * <p>Note: all fields stored in Intel low-byte/high-byte order.</p> 033 * 034 * <pre> 035 * Value Size Description 036 * ----- ---- ----------- 037 * (CDID) 0x0016 2 bytes Tag for this "extra" block type 038 * TSize 2 bytes Size of data that follows 039 * RCount 4 bytes Number of recipients. (inferred) 040 * HashAlg 2 bytes Hash algorithm identifier. (inferred) 041 * TData TSize Data 042 * </pre> 043 * 044 * @NotThreadSafe 045 * @since 1.11 046 */ 047public class X0016_CertificateIdForCentralDirectory extends PKWareExtraHeader { 048 049 private int rcount; 050 051 private HashAlgorithm hashAlg; 052 public X0016_CertificateIdForCentralDirectory() { 053 super(new ZipShort(0x0016)); 054 } 055 056 /** 057 * Get hash algorithm. 058 * @return the hash algorithm 059 */ 060 public HashAlgorithm getHashAlgorithm() { 061 return hashAlg; 062 } 063 064 /** 065 * Get record count. 066 * @return the record count 067 */ 068 public int getRecordCount() { 069 return rcount; 070 } 071 072 @Override 073 public void parseFromCentralDirectoryData(final byte[] data, final int offset, final int length) 074 throws ZipException { 075 assertMinimalLength(4, length); 076 // TODO: double check we really do not want to call super here 077 this.rcount = ZipShort.getValue(data, offset); 078 this.hashAlg = HashAlgorithm.getAlgorithmByCode(ZipShort.getValue(data, offset + 2)); 079 } 080}