CrlExtensions


1   /*************************************************************************
2    *                                                                       *
3    *  EJBCA: The OpenSource Certificate Authority                          *
4    *                                                                       *
5    *  This software is free software; you can redistribute it and/or       *
6    *  modify it under the terms of the GNU Lesser General Public           *
7    *  License as published by the Free Software Foundation; either         *
8    *  version 2.1 of the License, or any later version.                    *
9    *                                                                       *
10   *  See terms of license at gnu.org.                                     *
11   *                                                                       *
12   *************************************************************************/
13  
14  package org.ejbca.util.cert;
15  
16  import java.io.ByteArrayInputStream  ;
17  import java.io.IOException  ;
18  import java.math.BigInteger  ;
19  import java.security.cert.X509CRL  ;
20  
21  import org.apache.log4j.Logger;
22  import org.bouncycastle.asn1.ASN1InputStream;
23  import org.bouncycastle.asn1.ASN1OctetString;
24  import org.bouncycastle.asn1.DERInteger;
25  import org.bouncycastle.asn1.DERObject;
26  import org.bouncycastle.asn1.x509.CRLNumber;
27  import org.bouncycastle.asn1.x509.X509Extensions;
28  
29  /**
30   * A class for reading values from CRL extensions.
31   *
32   * @author  Tomas Gustavsson
33   * @version $Id: CrlExtensions.java,v 1.2 2006/07/28 07:14:16 anatom Exp $
34   */
35  public class CrlExtensions {
36      private static Logger log = Logger.getLogger(CrlExtensions.class);
37  
38      /** Returns the CRL number if it exists as a CRL exension
39       * 
40       * @return the CRLnumber, or 0 if no CRL number extension was found or an error reading it occured. Never return null.
41       */
42      public static BigInteger   getCrlNumber(X509CRL   crl) {
43          BigInteger   ret = BigInteger.valueOf(0);
44          try {
45              DERObject obj = CrlExtensions.getExtensionValue(crl, X509Extensions.CRLNumber.getId());
46              DERInteger crlnum = CRLNumber.getInstance(obj);
47              ret = crlnum.getPositiveValue();
48          } catch (IOException   e) {
49              log.error("Error reading CRL number extension: ", e);
50          }
51          return ret;
52      }
53      /**
54       * Return an Extension DERObject from a CRL
55       */
56      protected static DERObject getExtensionValue(X509CRL   crl, String   oid)
57        throws IOException   {
58          if (crl == null) {
59              return null;
60          }
61          byte[] bytes = crl.getExtensionValue(oid);
62          if (bytes == null) {
63              return null;
64          }
65          ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream  (bytes));
66          ASN1OctetString octs = (ASN1OctetString) aIn.readObject();
67          aIn = new ASN1InputStream(new ByteArrayInputStream  (octs.getOctets()));
68          return aIn.readObject();
69      } //getExtensionValue
70  
71  
72  }
73
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