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 individual file (0x0015).
025 *
026 * <p>
027 * This field contains the information about which certificate in the PKCS#7 store was used to sign a particular file. It also contains the signature data. This
028 * field can appear multiple times, but can only appear once per certificate.
029 * </p>
030 *
031 * <p>
032 * Note: all fields stored in Intel low-byte/high-byte order.
033 * </p>
034 *
035 * <pre>
036 *         Value     Size     Description
037 *         -----     ----     -----------
038 * (CID)   0x0015    2 bytes  Tag for this "extra" block type
039 *         TSize     2 bytes  Size of data that follows
040 *         RCount    4 bytes  Number of recipients. (inferred)
041 *         HashAlg   2 bytes  Hash algorithm identifier. (inferred)
042 *         TData     TSize    Signature Data
043 * </pre>
044 *
045 * @NotThreadSafe
046 * @since 1.11
047 */
048public class X0015_CertificateIdForFile extends PKWareExtraHeader {
049
050    static final ZipShort HEADER_ID = new ZipShort(0x0015);
051
052    private int rcount;
053
054    private HashAlgorithm hashAlg;
055
056    public X0015_CertificateIdForFile() {
057        super(HEADER_ID);
058    }
059
060    /**
061     * Gets hash algorithm.
062     *
063     * @return the hash algorithm
064     */
065    public HashAlgorithm getHashAlgorithm() {
066        return hashAlg;
067    }
068
069    /**
070     * Gets record count.
071     *
072     * @return the record count
073     */
074    public int getRecordCount() {
075        return rcount;
076    }
077
078    @Override
079    public void parseFromCentralDirectoryData(final byte[] data, final int offset, final int length) throws ZipException {
080        assertMinimalLength(4, length);
081        super.parseFromCentralDirectoryData(data, offset, length);
082        this.rcount = ZipShort.getValue(data, offset);
083        this.hashAlg = HashAlgorithm.getAlgorithmByCode(ZipShort.getValue(data, offset + 2));
084    }
085}