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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 1.6.

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package org.bouncycastle.asn1;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Enumeration;

/**
 * 
 * @deprecated use DERSet
 */
public class DERConstructedSet
    extends ASN1Set
{
    public DERConstructedSet()
    {
    }

    /**
     * @param obj - a single object that makes up the set.
     */
    public DERConstructedSet(
        DEREncodable   obj)
    {
        this.addObject(obj);
    }

    /**
     * @param v - a vector of objects making up the set.
     */
    public DERConstructedSet(
        DEREncodableVector   v)
    {
        for (int i = 0; i != v.size(); i++)
        {
            this.addObject(v.get(i));
        }
    }

    public void addObject(
        DEREncodable    obj)
    {
        super.addObject(obj);
    }

    public int getSize()
    {
        return size();
    }

    /*
     * A note on the implementation:
     * 
     * As DER requires the constructed, definite-length model to
     * be used for structured types, this varies slightly from the
     * ASN.1 descriptions given. Rather than just outputing SET,
     * we also have to specify CONSTRUCTED, and the objects length.
     */
    void encode(
        DEROutputStream out)
        throws IOException
    {
        ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
        DEROutputStream         dOut = new DEROutputStream(bOut);
        Enumeration             e = this.getObjects();

        while (e.hasMoreElements())
        {
            Object    obj = e.nextElement();

            dOut.writeObject(obj);
        }

        dOut.close();

        byte[]  bytes = bOut.toByteArray();

        out.writeEncoded(SET | CONSTRUCTED, bytes);
    }
}