/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * 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

 * published by the Free Software Foundation.

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.ec;

import java.math.BigInteger;

import java.security.*;

import java.security.spec.AlgorithmParameterSpec;

import java.security.spec.ECParameterSpec;

import java.security.spec.ECPoint;

import sun.security.util.ECUtil;

import static sun.security.util.SecurityProviderConstants.DEF_EC_KEY_SIZE;

/**

 * A fake EC keypair generator.

 */

public final class ECKeyPairGenerator extends KeyPairGeneratorSpi {

    private int keySize;

    public ECKeyPairGenerator() {

        initialize(DEF_EC_KEY_SIZE, null);

    }

    @Override

    public void initialize(int keySize, SecureRandom random) {

        this.keySize = keySize;

    }

    @Override

    public void initialize(AlgorithmParameterSpec params, SecureRandom random)

            throws InvalidAlgorithmParameterException {

        throw new UnsupportedOperationException();

    }

    @Override

    public KeyPair generateKeyPair() {

        BigInteger s, x, y;

        switch (keySize) {

            case 192:

                s = new BigInteger("144089953963995451666433763881605261867377"

                        + "0287449914970417");

                x = new BigInteger("527580219290493448707803038403444129676461"

                        + "560927008883862");

                y = new BigInteger("171489247081620145247240656640887886126295"

                        + "376102134763235");

                break;

            case 384:

                s = new BigInteger("230878276322370828604837367594276033697165"

                        + "328633328282930557390817326627704675451851870430805"

                        + "90262886393892128915463");

                x = new BigInteger("207573127814711182089888821916296502977037"

                        + "557291394001491584185306092085745595207966563387890"

                        + "64848861531410731137896");

                y = new BigInteger("272903686539605964684771543637437742229808"

                        + "792287657810480793861620950159864617021540168828129"

                        + "97920015041145259782242");

                break;

            case 571:

                s = new BigInteger("102950007413729156017516513076331886543538"

                        + "947044937190140406420556321983301533699021909556189"

                        + "150601557539520495361099574425100081169640300555562"

                        + "4280643194744140660275077121");

                x = new BigInteger("640598847385582251482893323029655037929442"

                        + "593800810090252942944624854811134311418807076811195"

                        + "132373308708007447666896675761104237802118413642543"

                        + "8277858107132017492037336593");

                y = new BigInteger("254271270803422773271985083014247202480077"

                        + "131823713050110789460550383275777195766342550786766"

                        + "080401402424961690914429074822281551140068729472439"

                        + "477216613432839953714415981");

                break;

            default:

                throw new AssertionError("Unsupported keysize " + keySize);

        }

        ECParameterSpec ecParams = ECUtil.getECParameterSpec(null, keySize);

        try {

            return new KeyPair(new ECPublicKeyImpl(new ECPoint(x, y), ecParams),

                    new ECPrivateKeyImpl(s, ecParams));

        } catch (Exception ex) {

            throw new ProviderException(ex);

        }

    }

}