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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;

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

/**
 * Stream that outputs encoding based on distinguished encoding rules.
 */
public class DEROutputStream
    extends ASN1OutputStream
{
    public DEROutputStream(
        OutputStream    os)
    {
        super(os);
    }

    public void writeObject(
        ASN1Encodable obj)
        throws IOException
    {
        if (obj != null)
        {
            obj.toASN1Primitive().toDERObject().encode(this);
        }
        else
        {
            throw new IOException("null object detected");
        }
    }

    ASN1OutputStream getDERSubStream()
    {
        return this;
    }

    ASN1OutputStream getDLSubStream()
    {
        return this;
    }
}