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      1 package org.bouncycastle.x509.extension;
      2 
      3 import java.io.IOException;
      4 import java.security.cert.CertificateParsingException;
      5 import java.security.cert.X509Certificate;
      6 import java.util.ArrayList;
      7 import java.util.Collection;
      8 import java.util.Collections;
      9 import java.util.Enumeration;
     10 import java.util.List;
     11 
     12 import org.bouncycastle.asn1.ASN1ObjectIdentifier;
     13 import org.bouncycastle.asn1.ASN1OctetString;
     14 import org.bouncycastle.asn1.ASN1Primitive;
     15 import org.bouncycastle.asn1.ASN1String;
     16 import org.bouncycastle.asn1.DEROctetString;
     17 import org.bouncycastle.asn1.DERSequence;
     18 import org.bouncycastle.asn1.x500.X500Name;
     19 import org.bouncycastle.asn1.x509.GeneralName;
     20 import org.bouncycastle.asn1.x509.X509Extension;
     21 import org.bouncycastle.util.Integers;
     22 
     23 
     24 public class X509ExtensionUtil
     25 {
     26     public static ASN1Primitive fromExtensionValue(
     27         byte[]  encodedValue)
     28         throws IOException
     29     {
     30         ASN1OctetString octs = (ASN1OctetString)ASN1Primitive.fromByteArray(encodedValue);
     31 
     32         return ASN1Primitive.fromByteArray(octs.getOctets());
     33     }
     34 
     35     public static Collection getIssuerAlternativeNames(X509Certificate cert)
     36             throws CertificateParsingException
     37     {
     38         byte[] extVal = cert.getExtensionValue(X509Extension.issuerAlternativeName.getId());
     39 
     40         return getAlternativeNames(extVal);
     41     }
     42 
     43     public static Collection getSubjectAlternativeNames(X509Certificate cert)
     44             throws CertificateParsingException
     45     {
     46         byte[] extVal = cert.getExtensionValue(X509Extension.subjectAlternativeName.getId());
     47 
     48         return getAlternativeNames(extVal);
     49     }
     50 
     51     private static Collection getAlternativeNames(byte[] extVal)
     52         throws CertificateParsingException
     53     {
     54         if (extVal == null)
     55         {
     56             return Collections.EMPTY_LIST;
     57         }
     58         try
     59         {
     60             Collection temp = new ArrayList();
     61             Enumeration it = DERSequence.getInstance(fromExtensionValue(extVal)).getObjects();
     62             while (it.hasMoreElements())
     63             {
     64                 GeneralName genName = GeneralName.getInstance(it.nextElement());
     65                 List list = new ArrayList();
     66                 list.add(Integers.valueOf(genName.getTagNo()));
     67                 switch (genName.getTagNo())
     68                 {
     69                 case GeneralName.ediPartyName:
     70                 case GeneralName.x400Address:
     71                 case GeneralName.otherName:
     72                     list.add(genName.getName().toASN1Primitive());
     73                     break;
     74                 case GeneralName.directoryName:
     75                     list.add(X500Name.getInstance(genName.getName()).toString());
     76                     break;
     77                 case GeneralName.dNSName:
     78                 case GeneralName.rfc822Name:
     79                 case GeneralName.uniformResourceIdentifier:
     80                     list.add(((ASN1String)genName.getName()).getString());
     81                     break;
     82                 case GeneralName.registeredID:
     83                     list.add(ASN1ObjectIdentifier.getInstance(genName.getName()).getId());
     84                     break;
     85                 case GeneralName.iPAddress:
     86                     list.add(DEROctetString.getInstance(genName.getName()).getOctets());
     87                     break;
     88                 default:
     89                     throw new IOException("Bad tag number: " + genName.getTagNo());
     90                 }
     91 
     92                 temp.add(list);
     93             }
     94             return Collections.unmodifiableCollection(temp);
     95         }
     96         catch (Exception e)
     97         {
     98             throw new CertificateParsingException(e.getMessage());
     99         }
    100     }
    101 }
    102