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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7.

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package org.spongycastle.asn1.x9;

import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1TaggedObject;

public class DHPublicKey
    extends ASN1Object
{
    private ASN1Integer y;

    public static DHPublicKey getInstance(ASN1TaggedObject obj, boolean explicit)
    {
        return getInstance(ASN1Integer.getInstance(obj, explicit));
    }

    public static DHPublicKey getInstance(Object obj)
    {
        if (obj == null || obj instanceof DHPublicKey)
        {
            return (DHPublicKey)obj;
        }

        if (obj instanceof ASN1Integer)
        {
            return new DHPublicKey((ASN1Integer)obj);
        }

        throw new IllegalArgumentException("Invalid DHPublicKey: " + obj.getClass().getName());
    }

    public DHPublicKey(ASN1Integer y)
    {
        if (y == null)
        {
            throw new IllegalArgumentException("'y' cannot be null");
        }

        this.y = y;
    }

    public ASN1Integer getY()
    {
        return this.y;
    }

    public ASN1Primitive toASN1Primitive()
    {
        return this.y;
    }
}