    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}