http://www.bouncycastle.org/java.html: 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 to JDK 1.8.
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package org.bouncycastle.asn1.x509;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;


The CRLNumber object.

CRLNumber::= INTEGER(0..MAX)



/**
 * The CRLNumber object.
 * <pre>
 * CRLNumber::= INTEGER(0..MAX)
 * </pre>
 */
public class CRLNumber
    extends ASN1Object
{
    private BigInteger number;

    public CRLNumber(
        BigInteger number)
    {
        this.number = number;
    }

    public BigInteger getCRLNumber()
    {
        return number;
    }

    public String toString()
    {
        return "CRLNumber: " + getCRLNumber();
    }

    public ASN1Primitive toASN1Primitive()
    {
        return new ASN1Integer(number);
    }

    public static CRLNumber getInstance(Object o)
    {
        if (o instanceof CRLNumber)
        {
            return (CRLNumber)o;
        }
        else if (o != null)
        {
            return new CRLNumber(ASN1Integer.getInstance(o).getValue());
        }

        return null;
    }
}