X509ExtensionUtil.java revision e6bf3e8dfa2804891a82075cb469b736321b4827 
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;
21
22
23public class X509ExtensionUtil
24{
25    public static ASN1Primitive fromExtensionValue(
26        byte[]  encodedValue)
27        throws IOException
28    {
29        ASN1OctetString octs = (ASN1OctetString)ASN1Primitive.fromByteArray(encodedValue);
30
31        return ASN1Primitive.fromByteArray(octs.getOctets());
32    }
33
34    public static Collection getIssuerAlternativeNames(X509Certificate cert)
35            throws CertificateParsingException
36    {
37        byte[] extVal = cert.getExtensionValue(X509Extension.issuerAlternativeName.getId());
38
39        return getAlternativeNames(extVal);
40    }
41
42    public static Collection getSubjectAlternativeNames(X509Certificate cert)
43            throws CertificateParsingException
44    {
45        byte[] extVal = cert.getExtensionValue(X509Extension.subjectAlternativeName.getId());
46
47        return getAlternativeNames(extVal);
48    }
49
50    private static Collection getAlternativeNames(byte[] extVal)
51        throws CertificateParsingException
52    {
53        if (extVal == null)
54        {
55            return Collections.EMPTY_LIST;
56        }
57        try
58        {
59            Collection temp = new ArrayList();
60            Enumeration it = DERSequence.getInstance(fromExtensionValue(extVal)).getObjects();
61            while (it.hasMoreElements())
62            {
63                GeneralName genName = GeneralName.getInstance(it.nextElement());
64                List list = new ArrayList();
65                // BEGIN android-changed
66                list.add(Integer.valueOf(genName.getTagNo()));
67                // END android-changed
68                switch (genName.getTagNo())
69                {
70                case GeneralName.ediPartyName:
71                case GeneralName.x400Address:
72                case GeneralName.otherName:
73                    list.add(genName.getName().toASN1Primitive());
74                    break;
75                case GeneralName.directoryName:
76                    list.add(X500Name.getInstance(genName.getName()).toString());
77                    break;
78                case GeneralName.dNSName:
79                case GeneralName.rfc822Name:
80                case GeneralName.uniformResourceIdentifier:
81                    list.add(((ASN1String)genName.getName()).getString());
82                    break;
83                case GeneralName.registeredID:
84                    list.add(ASN1ObjectIdentifier.getInstance(genName.getName()).getId());
85                    break;
86                case GeneralName.iPAddress:
87                    list.add(DEROctetString.getInstance(genName.getName()).getOctets());
88                    break;
89                default:
90                    throw new IOException("Bad tag number: " + genName.getTagNo());
91                }
92
93                temp.add(list);
94            }
95            return Collections.unmodifiableCollection(temp);
96        }
97        catch (Exception e)
98        {
99            throw new CertificateParsingException(e.getMessage());
100        }
101    }
102}
103