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
021/**
022 * X.509 Certificate ID and Signature for individual file (0x0015).
023 *
024 * <p>This field contains the information about which certificate in the PKCS#7
025 * store was used to sign a particular file. It also contains the signature
026 * data. This field can appear multiple times, but can only appear once per
027 * certificate.</p>
028 *
029 * <p>Note: all fields stored in Intel low-byte/high-byte order.</p>
030 *
031 * <pre>
032 *         Value     Size     Description
033 *         -----     ----     -----------
034 * (CID)   0x0015    2 bytes  Tag for this "extra" block type
035 *         TSize     2 bytes  Size of data that follows
036 *         RCount    4 bytes  Number of recipients. (inferred)
037 *         HashAlg   2 bytes  Hash algorithm identifier. (inferred)
038 *         TData     TSize    Signature Data
039 * </pre>
040 *
041 * @NotThreadSafe
042 * @since 1.11
043 */
044public class X0015_CertificateIdForFile extends PKWareExtraHeader implements ZipExtraField {
045    private static final long serialVersionUID = 1L;
046
047    public X0015_CertificateIdForFile() {
048        super(new ZipShort(0x0015));
049    }
050
051    private int rcount;
052    private HashAlgorithm hashAlg;
053
054    /**
055     * Get record count.
056     * @return the record count
057     */
058    public int getRecordCount() {
059        return rcount;
060    }
061
062    /**
063     * Get hash algorithm.
064     * @return the hash algorithm
065     */
066    public HashAlgorithm getHashAlgorithm() {
067        return hashAlg;
068    }
069
070    @Override
071    public void parseFromCentralDirectoryData(byte[] data, int offset, int length) {
072        super.parseFromCentralDirectoryData(data, offset, length);
073        this.rcount = ZipShort.getValue(data, offset);
074        this.hashAlg = HashAlgorithm.getAlgorithmByCode(ZipShort.getValue(data, offset + 2));
075    }
076}