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package org.spongycastle.asn1.x509;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.ASN1TaggedObject;
import org.spongycastle.asn1.DERSequence;
public class Extensions
extends ASN1Object
{
private Hashtable extensions = new Hashtable();
private Vector ordering = new Vector();
public static Extensions getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
return getInstance(ASN1Sequence.getInstance(obj, explicit));
}
public static Extensions getInstance(
Object obj)
{
if (obj instanceof Extensions)
{
return (Extensions)obj;
}
else if (obj != null)
{
return new Extensions(ASN1Sequence.getInstance(obj));
}
return null;
}
/**
* Constructor from ASN1Sequence.
* <p/>
* the extensions are a list of constructed sequences, either with (OID, OctetString) or (OID, Boolean, OctetString)
*/
private Extensions(
ASN1Sequence seq)
{
Enumeration e = seq.getObjects();
while (e.hasMoreElements())
{
Extension ext = Extension.getInstance(e.nextElement());
extensions.put(ext.getExtnId(), ext);
ordering.addElement(ext.getExtnId());
}
}
/**
* Base Constructor
*
* @param extension a single extension.
*/
public Extensions(
Extension extension)
{
this.ordering.addElement(extension.getExtnId());
this.extensions.put(extension.getExtnId(), extension);
}
/**
* Base Constructor
*
* @param extensions an array of extensions.
*/
public Extensions(
Extension[] extensions)
{
for (int i = 0; i != extensions.length; i++)
{
Extension ext = extensions[i];
this.ordering.addElement(ext.getExtnId());
this.extensions.put(ext.getExtnId(), ext);
}
}
/**
* return an Enumeration of the extension field's object ids.
*/
public Enumeration oids()
{
return ordering.elements();
}
/**
* return the extension represented by the object identifier
* passed in.
*
* @return the extension if it's present, null otherwise.
*/
public Extension getExtension(
ASN1ObjectIdentifier oid)
{
return (Extension)extensions.get(oid);
}
/**
* return the parsed value of the extension represented by the object identifier
* passed in.
*
* @return the parsed value of the extension if it's present, null otherwise.
*/
public ASN1Encodable getExtensionParsedValue(ASN1ObjectIdentifier oid)
{
Extension ext = this.getExtension(oid);
if (ext != null)
{
return ext.getParsedValue();
}
return null;
}
/**
* <pre>
* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
*
* Extension ::= SEQUENCE {
* extnId EXTENSION.&id ({ExtensionSet}),
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING }
* </pre>
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector vec = new ASN1EncodableVector();
Enumeration e = ordering.elements();
while (e.hasMoreElements())
{
ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)e.nextElement();
Extension ext = (Extension)extensions.get(oid);
vec.add(ext);
}
return new DERSequence(vec);
}
public boolean equivalent(
Extensions other)
{
if (extensions.size() != other.extensions.size())
{
return false;
}
Enumeration e1 = extensions.keys();
while (e1.hasMoreElements())
{
Object key = e1.nextElement();
if (!extensions.get(key).equals(other.extensions.get(key)))
{
return false;
}
}
return true;
}
public ASN1ObjectIdentifier[] getExtensionOIDs()
{
return toOidArray(ordering);
}
public ASN1ObjectIdentifier[] getNonCriticalExtensionOIDs()
{
return getExtensionOIDs(false);
}
public ASN1ObjectIdentifier[] getCriticalExtensionOIDs()
{
return getExtensionOIDs(true);
}
private ASN1ObjectIdentifier[] getExtensionOIDs(boolean isCritical)
{
Vector oidVec = new Vector();
for (int i = 0; i != ordering.size(); i++)
{
Object oid = ordering.elementAt(i);
if (((Extension)extensions.get(oid)).isCritical() == isCritical)
{
oidVec.addElement(oid);
}
}
return toOidArray(oidVec);
}
private ASN1ObjectIdentifier[] toOidArray(Vector oidVec)
{
ASN1ObjectIdentifier[] oids = new ASN1ObjectIdentifier[oidVec.size()];
for (int i = 0; i != oids.length; i++)
{
oids[i] = (ASN1ObjectIdentifier)oidVec.elementAt(i);
}
return oids;
}
}
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