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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.asn1;

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

public class DERSequence
    extends ASN1Sequence
{
    /**
     * create an empty sequence
     */
    public DERSequence()
    {
    }

    /**
     * create a sequence containing one object
     */
    public DERSequence(
        DEREncodable    obj)
    {
        this.addObject(obj);
    }

    /**
     * create a sequence containing a vector of objects.
     */
    public DERSequence(
        ASN1EncodableVector   v)
    {
        for (int i = 0; i != v.size(); i++)
        {
            this.addObject(v.get(i));
        }
    }

    /**
     * create a sequence containing an array of objects.
     */
    public DERSequence(
        ASN1Encodable[]   a)
    {
        for (int i = 0; i != a.length; i++)
        {
            this.addObject(a[i]);
        }
    }
    
    /*
     * 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 SEQUENCE,
     * we also have to specify CONSTRUCTED, and the objects length.
     */
    void encode(
        DEROutputStream out)
        throws IOException
    {
        // TODO Intermediate buffer could be avoided if we could calculate expected length
        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(SEQUENCE | CONSTRUCTED, bytes);
    }
}