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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;

/**
 * Class representing the DER-type External
 */
public class DERExternal
    extends ASN1External
{
    /**
     * Construct a DER EXTERNAL object, the input encoding vector must have exactly two elements on it.
     * 
     * Acceptable input formats are:
     * 

     *  {@link ASN1ObjectIdentifier} + data {@link DERTaggedObject} (direct reference form)
     *  {@link ASN1Integer} + data {@link DERTaggedObject} (indirect reference form)
     *  Anything but {@link DERTaggedObject} + data {@link DERTaggedObject} (data value form)
     * 
     *
     * @throws IllegalArgumentException if input size is wrong, or
     */
    public DERExternal(ASN1EncodableVector vector)
    {
        super(vector);
    }

    /**
     * Creates a new instance of DERExternal
     * See X.690 for more informations about the meaning of these parameters
     * @param directReference The direct reference or null if not set.
     * @param indirectReference The indirect reference or null if not set.
     * @param dataValueDescriptor The data value descriptor or null if not set.
     * @param externalData The external data in its encoded form.
     */
    public DERExternal(ASN1ObjectIdentifier directReference, ASN1Integer indirectReference, ASN1Primitive dataValueDescriptor, DERTaggedObject externalData)
    {
        this(directReference, indirectReference, dataValueDescriptor, externalData.getTagNo(), externalData.toASN1Primitive());
    }

    /**
     * Creates a new instance of DERExternal.
     * See X.690 for more informations about the meaning of these parameters
     * @param directReference The direct reference or null if not set.
     * @param indirectReference The indirect reference or null if not set.
     * @param dataValueDescriptor The data value descriptor or null if not set.
     * @param encoding The encoding to be used for the external data
     * @param externalData The external data
     */
    public DERExternal(ASN1ObjectIdentifier directReference, ASN1Integer indirectReference, ASN1Primitive dataValueDescriptor, int encoding, ASN1Primitive externalData)
    {
        super(directReference, indirectReference, dataValueDescriptor, encoding, externalData);
    }

    ASN1Primitive toDERObject()
    {
        return this;
    }

    ASN1Primitive toDLObject()
    {
        return this;
    }

    int encodedLength()
        throws IOException
    {
        return this.getEncoded().length;
    }

    /* (non-Javadoc)
     * @see org.bouncycastle.asn1.ASN1Primitive#encode(org.bouncycastle.asn1.DEROutputStream)
     */
    void encode(ASN1OutputStream out, boolean withTag) throws IOException
    {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        if (directReference != null)
        {
            baos.write(directReference.getEncoded(ASN1Encoding.DER));
        }
        if (indirectReference != null)
        {
            baos.write(indirectReference.getEncoded(ASN1Encoding.DER));
        }
        if (dataValueDescriptor != null)
        {
            baos.write(dataValueDescriptor.getEncoded(ASN1Encoding.DER));
        }
        DERTaggedObject obj = new DERTaggedObject(true, encoding, externalContent);
        baos.write(obj.getEncoded(ASN1Encoding.DER));

        out.writeEncoded(withTag, BERTags.CONSTRUCTED, BERTags.EXTERNAL, baos.toByteArray());
    }
}