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. 
package org.bouncycastle.asn1;

import java.math.BigInteger;

public class ASN1Integer
    extends DERInteger
{
    ASN1Integer(byte[] bytes)
    {
        super(bytes);
    }

    public ASN1Integer(BigInteger value)
    {
        super(value);
    }

    public ASN1Integer(int value)
    {
        super(value);
    }
}