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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.cms.ecc;

import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.ASN1TaggedObject;
import org.spongycastle.asn1.DERObject;
import org.spongycastle.asn1.DERSequence;
import org.spongycastle.asn1.DERTaggedObject;
import org.spongycastle.asn1.cms.OriginatorPublicKey;

public class MQVuserKeyingMaterial
    extends ASN1Encodable
{
    private OriginatorPublicKey ephemeralPublicKey;
    private ASN1OctetString addedukm;

    public MQVuserKeyingMaterial(
        OriginatorPublicKey ephemeralPublicKey,
        ASN1OctetString addedukm)
    {
        // TODO Check ephemeralPublicKey not null
        
        this.ephemeralPublicKey = ephemeralPublicKey;
        this.addedukm = addedukm;
    }

    private MQVuserKeyingMaterial(
        ASN1Sequence seq)
    {
        // TODO Check seq has either 1 or 2 elements

        this.ephemeralPublicKey = OriginatorPublicKey.getInstance(
            seq.getObjectAt(0));

        if (seq.size() > 1)
        {
            this.addedukm = ASN1OctetString.getInstance(
                (ASN1TaggedObject)seq.getObjectAt(1), true);
        }
    }

    /**
     * return an MQVuserKeyingMaterial object from a tagged object.
     *
     * @param obj      the tagged object holding the object we want.
     * @param explicit true if the object is meant to be explicitly
     *                 tagged false otherwise.
     * @throws IllegalArgumentException if the object held by the
     *                                  tagged object cannot be converted.
     */
    public static MQVuserKeyingMaterial getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    /**
     * return an MQVuserKeyingMaterial object from the given object.
     *
     * @param obj the object we want converted.
     * @throws IllegalArgumentException if the object cannot be converted.
     */
    public static MQVuserKeyingMaterial getInstance(
        Object obj)
    {
        if (obj == null || obj instanceof MQVuserKeyingMaterial)
        {
            return (MQVuserKeyingMaterial)obj;
        }

        if (obj instanceof ASN1Sequence)
        {
            return new MQVuserKeyingMaterial((ASN1Sequence)obj);
        }

        throw new IllegalArgumentException("Invalid MQVuserKeyingMaterial: " + obj.getClass().getName());
    }

    public OriginatorPublicKey getEphemeralPublicKey()
    {
        return ephemeralPublicKey;
    }

    public ASN1OctetString getAddedukm()
    {
        return addedukm;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     *      * MQVuserKeyingMaterial ::= SEQUENCE {
     *   ephemeralPublicKey OriginatorPublicKey,
     *   addedukm [0] EXPLICIT UserKeyingMaterial OPTIONAL  }
     * 
     */
    public DERObject toASN1Object()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();
        v.add(ephemeralPublicKey);

        if (addedukm != null)
        {
            v.add(new DERTaggedObject(true, 0, addedukm));
        }

        return new DERSequence(v);
    }
}