/*
 * @(#)ECPublicKeySpec.java	1.3 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package java.security.spec;

/**
 * This immutable class specifies an elliptic curve public key with 
 * its associated parameters.
 *
 * @see KeySpec
 * @see ECPoint
 * @see ECParameterSpec
 *
 * @author Valerie Peng
 * @version 1.3, 12/19/03
 *
 * @since 1.5
 */
public class ECPublicKeySpec implements KeySpec {

    private ECPoint w;
    private ECParameterSpec params;

    /**
     * Creates a new ECPublicKeySpec with the specified 
     * parameter values.
     * @param w the public point.
     * @param params the associated elliptic curve domain 
     * parameters.
     * @exception NullPointerException if <code>w</code>
     * or <code>params</code> is null.
     * @exception IllegalArgumentException if <code>w</code>
     * is point at infinity, i.e. ECPoint.POINT_INFINITY
     */
    public ECPublicKeySpec(ECPoint w, ECParameterSpec params) {
	if (w == null) {
            throw new NullPointerException("w is null");
        }
        if (params == null) {
            throw new NullPointerException("params is null");
        }
	if (w == ECPoint.POINT_INFINITY) {
	    throw new IllegalArgumentException("w is ECPoint.POINT_INFINITY");
	}
        this.w = w;
        this.params = params;
    }

    /**
     * Returns the public point W.
     * @return the public point W.
     */
    public ECPoint getW() {
	return w;
    }

    /**
     * Returns the associated elliptic curve domain 
     * parameters.
     * @return the EC domain parameters.
     */
    public ECParameterSpec getParams() {
	return params;
    }
}