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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.asn1.x509;

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.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.
     * 

* 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()); if (extensions.containsKey(ext.getExtnId())) { throw new IllegalArgumentException("repeated extension found: " + ext.getExtnId()); } 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; } /** *
     *     Extensions        ::=   SEQUENCE SIZE (1..MAX) OF Extension
     *
     *     Extension         ::=   SEQUENCE {
     *        extnId            EXTENSION.&id ({ExtensionSet}),
     *        critical          BOOLEAN DEFAULT FALSE,
     *        extnValue         OCTET STRING }
     * 
*/ 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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