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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.asn1.ocsp;

import org.spongycastle.asn1.ASN1Choice;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1TaggedObject;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.DERTaggedObject;
import org.spongycastle.asn1.x500.X500Name;

public class ResponderID
    extends ASN1Object
    implements ASN1Choice
{
    private ASN1Encodable    value;

    public ResponderID(
        ASN1OctetString    value)
    {
        this.value = value;
    }

    public ResponderID(
        X500Name value)
    {
        this.value = value;
    }

    public static ResponderID getInstance(
        Object  obj)
    {
        if (obj instanceof ResponderID)
        {
            return (ResponderID)obj;
        }
        else if (obj instanceof DEROctetString)
        {
            return new ResponderID((DEROctetString)obj);
        }
        else if (obj instanceof ASN1TaggedObject)
        {
            ASN1TaggedObject    o = (ASN1TaggedObject)obj;

            if (o.getTagNo() == 1)
            {
                return new ResponderID(X500Name.getInstance(o, true));
            }
            else
            {
                return new ResponderID(ASN1OctetString.getInstance(o, true));
            }
        }

        return new ResponderID(X500Name.getInstance(obj));
    }

    public static ResponderID getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(obj.getObject()); // must be explicitly tagged
    }

    public byte[] getKeyHash()
    {
        if (this.value instanceof ASN1OctetString)
        {
            ASN1OctetString octetString = (ASN1OctetString)this.value;
            return octetString.getOctets();
        }

        return null;
    }

    public X500Name getName()
    {
        if (this.value instanceof ASN1OctetString)
        {
            return null;
        }

        return X500Name.getInstance(value);
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     *      * ResponderID ::= CHOICE {
     *      byName          [1] Name,
     *      byKey           [2] KeyHash }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        if (value instanceof ASN1OctetString)
        {
            return new DERTaggedObject(true, 2, value);
        }

        return new DERTaggedObject(true, 1, value);
    }
}