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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 and up.

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package org.bouncycastle.asn1;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * A stream generator for DER SEQUENCEs
 */
public class DERSequenceGenerator
    extends DERGenerator
{
    private final ByteArrayOutputStream _bOut = new ByteArrayOutputStream();

    /**
     * Use the passed in stream as the target for the generator.
     *
     * @param out target stream
     * @throws IOException if the target stream cannot be written to.
     */
    public DERSequenceGenerator(
        OutputStream out)
        throws IOException
    {
        super(out);
    }

    /**
     * Use the passed in stream as the target for the generator, writing out the header tag
     * for a tagged constructed SEQUENCE (possibly implicit).
     *
     * @param out target stream
     * @param tagNo the tag number to introduce
     * @param isExplicit true if this is an explicitly tagged object, false otherwise.
     * @throws IOException if the target stream cannot be written to.
     */
    public DERSequenceGenerator(
        OutputStream out,
        int          tagNo,
        boolean      isExplicit)
        throws IOException
    {
        super(out, tagNo, isExplicit);
    }

    /**
     * Add an object to the SEQUENCE being generated.
     *
     * @param object an ASN.1 encodable object to add.
     * @throws IOException if the target stream cannot be written to or the object cannot be encoded.
     */
    public void addObject(ASN1Encodable object) throws IOException
    {
        object.toASN1Primitive().encodeTo(_bOut, ASN1Encoding.DER);
    }

    /**
     * Add an ASN1.1 primitive to the SEQUENCE being generated.
     *
     * @param primitive an ASN.1 primitive to add.
     * @throws IOException if the target stream cannot be written to or the primitive cannot be encoded.
     */
    public void addObject(ASN1Primitive primitive) throws IOException
    {
        primitive.encodeTo(_bOut, ASN1Encoding.DER);
    }

    /**
     * Return the target stream for the SEQUENCE.
     *
     * @return  the OutputStream the SEQUENCE is being written to.
     */
    public OutputStream getRawOutputStream()
    {
        return _bOut;
    }

    /**
     * Close of the generator, writing out the SEQUENCE.
     *
     * @throws IOException if the target stream cannot be written.
     */
    public void close() 
        throws IOException
    {
        writeDEREncoded(BERTags.CONSTRUCTED | BERTags.SEQUENCE, _bOut.toByteArray());
    }
}