package org.bouncycastle.x509.extension;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERString;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.X509Extensions;
import org.bouncycastle.asn1.x509.X509Name;
import java.io.IOException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
public class X509ExtensionUtil
{
public static ASN1Object fromExtensionValue(
byte[] encodedValue)
throws IOException
{
ASN1OctetString octs = (ASN1OctetString)ASN1Object.fromByteArray(encodedValue);
return ASN1Object.fromByteArray(octs.getOctets());
}
public static Collection getIssuerAlternativeNames(X509Certificate cert)
throws CertificateParsingException
{
byte[] extVal = cert.getExtensionValue(X509Extensions.IssuerAlternativeName.getId());
return getAlternativeName(extVal);
}
public static Collection getSubjectAlternativeNames(X509Certificate cert)
throws CertificateParsingException
{
byte[] extVal = cert.getExtensionValue(X509Extensions.SubjectAlternativeName.getId());
return getAlternativeName(extVal);
}
private static Collection getAlternativeName(byte[] extVal)
throws CertificateParsingException
{
Collection temp = new ArrayList();
if (extVal == null)
{
return Collections.EMPTY_LIST;
}
try
{
byte[] extnValue = DEROctetString.getInstance(ASN1Object.fromByteArray(extVal)).getOctets();
Enumeration it = DERSequence.getInstance(ASN1Object.fromByteArray(extnValue)).getObjects();
while (it.hasMoreElements())
{
GeneralName genName = GeneralName.getInstance(it.nextElement());
List list = new ArrayList();
list.add(new Integer(genName.getTagNo()));
switch (genName.getTagNo())
{
case GeneralName.ediPartyName:
case GeneralName.x400Address:
case GeneralName.otherName:
list.add(genName.getName().getDERObject());
break;
case GeneralName.directoryName:
list.add(X509Name.getInstance(genName.getName()).toString());
break;
case GeneralName.dNSName:
case GeneralName.rfc822Name:
case GeneralName.uniformResourceIdentifier:
list.add(((DERString)genName.getName()).getString());
break;
case GeneralName.registeredID:
list.add(DERObjectIdentifier.getInstance(genName.getName()).getId());
break;
case GeneralName.iPAddress:
list.add(DEROctetString.getInstance(genName.getName()).getOctets());
break;
default:
throw new IOException("Bad tag number: " + genName.getTagNo());
}
temp.add(list);
}
}
catch (Exception e)
{
throw new CertificateParsingException(e.getMessage());
}
return Collections.unmodifiableCollection(temp);
}
}