X509ExtensionUtil.java revision e1142c149e244797ce73b0e7fad40816e447a817 
1package org.bouncycastle.x509.extension;
2
3import java.io.IOException;
4import java.security.cert.CertificateParsingException;
5import java.security.cert.X509Certificate;
6import java.util.ArrayList;
7import java.util.Collection;
8import java.util.Collections;
9import java.util.Enumeration;
10import java.util.List;
11
12import org.bouncycastle.asn1.ASN1ObjectIdentifier;
13import org.bouncycastle.asn1.ASN1OctetString;
14import org.bouncycastle.asn1.ASN1Primitive;
15import org.bouncycastle.asn1.ASN1String;
16import org.bouncycastle.asn1.DEROctetString;
17import org.bouncycastle.asn1.DERSequence;
18import org.bouncycastle.asn1.x500.X500Name;
19import org.bouncycastle.asn1.x509.GeneralName;
20import org.bouncycastle.asn1.x509.X509Extension;
21import org.bouncycastle.util.Integers;
22
23
24public 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