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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

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 *

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package java.security.spec;

import java.math.BigInteger;

import java.util.Objects;

/**

 * A class representing elliptic curve public keys as defined in RFC 7748,

 * including the curve and other algorithm parameters. The public key is a

 * particular point on the curve, which is represented using only its

 * u-coordinate. A u-coordinate is an element of the field of integers modulo

 * some value that is determined by the algorithm parameters. This field

 * element is represented by a BigInteger which may hold any value. That is,

 * the BigInteger is not restricted to the range of canonical field elements.

 *

 * @since 11

 */

public class XECPublicKeySpec implements KeySpec {

    private final AlgorithmParameterSpec params;

    private final BigInteger u;

    /**

     * Construct a public key spec using the supplied parameters and

     * u coordinate.

     *

     * @param params the algorithm parameters

     * @param u the u-coordinate of the point, represented using a BigInteger

     *          which may hold any value

     *

     * @throws NullPointerException if {@code params} or {@code u}

     *                              is null.

     */

    public XECPublicKeySpec(AlgorithmParameterSpec params, BigInteger u) {

        Objects.requireNonNull(params, "params must not be null");

        Objects.requireNonNull(u, "u must not be null");

        this.params = params;

        this.u = u;

    }

    /**

     * Get the algorithm parameters that define the curve and other settings.

     *

     * @return the parameters

     */

    public AlgorithmParameterSpec getParams() {

        return params;

    }

    /**

     * Get the u coordinate of the point.

     *

     * @return the u-coordinate, represented using a BigInteger which may hold

     *          any value

     */

    public BigInteger getU() {

        return u;

    }

}