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package org.bouncycastle.asn1.x9;

import java.math.BigInteger;

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

/**
 * X9.42 definition of a DHPublicKey
 * 
 *     DHPublicKey ::= INTEGER
 * 
*/ public class DHPublicKey extends ASN1Object { private ASN1Integer y; /** * Return a DHPublicKey from the passed in tagged object. * * @param obj a tagged object. * @param explicit true if the contents of the object is explictly tagged, false otherwise. * @return a DHPublicKey */ public static DHPublicKey getInstance(ASN1TaggedObject obj, boolean explicit) { return getInstance(ASN1Integer.getInstance(obj, explicit)); } /** * Return a DHPublicKey from the passed in object. * * @param obj an object for conversion or a byte[]. * @return a DHPublicKey */ 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()); } private DHPublicKey(ASN1Integer y) { if (y == null) { throw new IllegalArgumentException("'y' cannot be null"); } this.y = y; } /** * Base constructor. * * @param y the public value Y. */ public DHPublicKey(BigInteger y) { if (y == null) { throw new IllegalArgumentException("'y' cannot be null"); } this.y = new ASN1Integer(y); } /** * Return the public value Y for the key. * * @return the Y value. */ public BigInteger getY() { return this.y.getPositiveValue(); } /** * Return an ASN.1 primitive representation of this object. * * @return an ASN1Integer. */ public ASN1Primitive toASN1Primitive() { return this.y; } }




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