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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 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.asn1.pkcs;

import java.math.BigInteger;
import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;

public class DHParameter
    extends ASN1Object
{
    ASN1Integer      p, g, l;

    public DHParameter(
        BigInteger  p,
        BigInteger  g,
        int         l)
    {
        this.p = new ASN1Integer(p);
        this.g = new ASN1Integer(g);

        if (l != 0)
        {
            this.l = new ASN1Integer(l);
        }
        else
        {
            this.l = null;
        }
    }

    public static DHParameter getInstance(
        Object  obj)
    {
        if (obj instanceof DHParameter)
        {
            return (DHParameter)obj;
        }

        if (obj != null)
        {
            return new DHParameter(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    private DHParameter(
        ASN1Sequence  seq)
    {
        Enumeration     e = seq.getObjects();

        p = ASN1Integer.getInstance(e.nextElement());
        g = ASN1Integer.getInstance(e.nextElement());

        if (e.hasMoreElements())
        {
            l = (ASN1Integer)e.nextElement();
        }
        else
        {
            l = null;
        }
    }

    public BigInteger getP()
    {
        return p.getPositiveValue();
    }

    public BigInteger getG()
    {
        return g.getPositiveValue();
    }

    public BigInteger getL()
    {
        if (l == null)
        {
            return null;
        }

        return l.getPositiveValue();
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(p);
        v.add(g);

        if (this.getL() != null)
        {
            v.add(l);
        }

        return new DERSequence(v);
    }
}