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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.IOException;

/**
 * An ASN.1 DER NULL object.
 * 
 * Preferably use the constant:  DERNull.INSTANCE.
 */
public class DERNull
    extends ASN1Null
{
    public static final DERNull INSTANCE = new DERNull();

    private static final byte[]  zeroBytes = new byte[0];

    private DERNull()
    {
    }

    boolean encodeConstructed()
    {
        return false;
    }

    int encodedLength(boolean withTag)
    {
        return ASN1OutputStream.getLengthOfEncodingDL(withTag, 0);
    }

    void encode(ASN1OutputStream out, boolean withTag) throws IOException
    {
        out.writeEncodingDL(withTag, BERTags.NULL, zeroBytes);
    }
}