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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.commons.compress.archivers.zip;
20  
21  import java.util.zip.ZipException;
22  
23  /**
24   * X.509 Certificate ID and Signature for individual file (0x0015).
25   *
26   * <p>
27   * 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
28   * field can appear multiple times, but can only appear once per certificate.
29   * </p>
30   *
31   * <p>
32   * Note: all fields stored in Intel low-byte/high-byte order.
33   * </p>
34   *
35   * <pre>
36   *         Value     Size     Description
37   *         -----     ----     -----------
38   * (CID)   0x0015    2 bytes  Tag for this "extra" block type
39   *         TSize     2 bytes  Size of data that follows
40   *         RCount    4 bytes  Number of recipients. (inferred)
41   *         HashAlg   2 bytes  Hash algorithm identifier. (inferred)
42   *         TData     TSize    Signature Data
43   * </pre>
44   *
45   * @NotThreadSafe
46   * @since 1.11
47   */
48  public class X0015_CertificateIdForFile extends PKWareExtraHeader {
49  
50      static final ZipShort HEADER_ID = new ZipShort(0x0015);
51  
52      private int rcount;
53  
54      private HashAlgorithm hashAlg;
55  
56      public X0015_CertificateIdForFile() {
57          super(HEADER_ID);
58      }
59  
60      /**
61       * Gets hash algorithm.
62       *
63       * @return the hash algorithm
64       */
65      public HashAlgorithm getHashAlgorithm() {
66          return hashAlg;
67      }
68  
69      /**
70       * Gets record count.
71       *
72       * @return the record count
73       */
74      public int getRecordCount() {
75          return rcount;
76      }
77  
78      @Override
79      public void parseFromCentralDirectoryData(final byte[] data, final int offset, final int length) throws ZipException {
80          assertMinimalLength(4, length);
81          super.parseFromCentralDirectoryData(data, offset, length);
82          this.rcount = ZipShort.getValue(data, offset);
83          this.hashAlg = HashAlgorithm.getAlgorithmByCode(ZipShort.getValue(data, offset + 2));
84      }
85  }