/*

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

 *

 * This code is free software; you can redistribute it and/or modify it

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

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

 *

 * 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

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

package sun.security.ec;

import java.io.IOException;

import java.security.*;

import java.security.interfaces.*;

import java.security.spec.*;

import sun.security.util.*;

import sun.security.x509.*;

/**

 * Key implementation for EC public keys.

 *

 * @since   1.6

 * @author  Andreas Sterbenz

 */

public final class ECPublicKeyImpl extends X509Key implements ECPublicKey {

    private static final long serialVersionUID = -2462037275160462289L;

    private ECPoint w;

    private ECParameterSpec params;

    /**

     * Construct a key from its components. Used by the

     * ECKeyFactory and SunPKCS11.

     */

    public ECPublicKeyImpl(ECPoint w, ECParameterSpec params)

            throws InvalidKeyException {

        this.w = w;

        this.params = params;

        // generate the encoding

        algid = new AlgorithmId

            (AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params));

        key = ECParameters.encodePoint(w, params.getCurve());

    }

    /**

     * Construct a key from its encoding. Used by RSAKeyFactory.

     */

    public ECPublicKeyImpl(byte[] encoded) throws InvalidKeyException {

        decode(encoded);

    }

    // see JCA doc

    public String getAlgorithm() {

        return "EC";

    }

    // see JCA doc

    public ECPoint getW() {

        return w;

    }

    // see JCA doc

    public ECParameterSpec getParams() {

        return params;

    }

    // Internal API to get the encoded point. Currently used by SunPKCS11.

    // This may change/go away depending on what we do with the public API.

    public byte[] getEncodedPublicValue() {

        return key.clone();

    }

    /**

     * Parse the key. Called by X509Key.

     */

    protected void parseKeyBits() throws InvalidKeyException {

        try {

            AlgorithmParameters algParams = this.algid.getParameters();

            params = algParams.getParameterSpec(ECParameterSpec.class);

            w = ECParameters.decodePoint(key, params.getCurve());

        } catch (IOException e) {

            throw new InvalidKeyException("Invalid EC key", e);

        } catch (InvalidParameterSpecException e) {

            throw new InvalidKeyException("Invalid EC key", e);

        }

    }

    // return a string representation of this key for debugging

    public String toString() {

        return "Sun EC public key, " + params.getCurve().getField().getFieldSize()

            + " bits\n  public x coord: " + w.getAffineX()

            + "\n  public y coord: " + w.getAffineY()

            + "\n  parameters: " + params;

    }

    protected Object writeReplace() throws java.io.ObjectStreamException {

        return new KeyRep(KeyRep.Type.PUBLIC,

                        getAlgorithm(),

                        getFormat(),

                        getEncoded());

    }

}