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package org.spongycastle.x509.extension;
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;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1String;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.DERSequence;
import org.spongycastle.asn1.x500.X500Name;
import org.spongycastle.asn1.x509.GeneralName;
import org.spongycastle.asn1.x509.X509Extension;
import org.spongycastle.util.Integers;
public class X509ExtensionUtil
{
public static ASN1Primitive fromExtensionValue(
byte[] encodedValue)
throws IOException
{
ASN1OctetString octs = (ASN1OctetString)ASN1Primitive.fromByteArray(encodedValue);
return ASN1Primitive.fromByteArray(octs.getOctets());
}
public static Collection getIssuerAlternativeNames(X509Certificate cert)
throws CertificateParsingException
{
byte[] extVal = cert.getExtensionValue(X509Extension.issuerAlternativeName.getId());
return getAlternativeNames(extVal);
}
public static Collection getSubjectAlternativeNames(X509Certificate cert)
throws CertificateParsingException
{
byte[] extVal = cert.getExtensionValue(X509Extension.subjectAlternativeName.getId());
return getAlternativeNames(extVal);
}
private static Collection getAlternativeNames(byte[] extVal)
throws CertificateParsingException
{
if (extVal == null)
{
return Collections.EMPTY_LIST;
}
try
{
Collection temp = new ArrayList();
Enumeration it = DERSequence.getInstance(fromExtensionValue(extVal)).getObjects();
while (it.hasMoreElements())
{
GeneralName genName = GeneralName.getInstance(it.nextElement());
List list = new ArrayList();
list.add(Integers.valueOf(genName.getTagNo()));
switch (genName.getTagNo())
{
case GeneralName.ediPartyName:
case GeneralName.x400Address:
case GeneralName.otherName:
list.add(genName.getName().toASN1Primitive());
break;
case GeneralName.directoryName:
list.add(X500Name.getInstance(genName.getName()).toString());
break;
case GeneralName.dNSName:
case GeneralName.rfc822Name:
case GeneralName.uniformResourceIdentifier:
list.add(((ASN1String)genName.getName()).getString());
break;
case GeneralName.registeredID:
list.add(ASN1ObjectIdentifier.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);
}
return Collections.unmodifiableCollection(temp);
}
catch (Exception e)
{
throw new CertificateParsingException(e.getMessage());
}
}
}
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