/*
 * Copyright © 2020, 2021, 2022, 2023 Peter Doornbosch
 *
 * This file is part of Kwik, an implementation of the QUIC protocol in Java.
 *
 * Kwik is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * Kwik 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 Lesser General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.luminis.quic;

import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.ECKey;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECGenParameterSpec;

public class KeyUtils {

    static public ECKey[] generateKeys() {
        try {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
            keyPairGenerator.initialize(new ECGenParameterSpec("secp256r1"));

            KeyPair keyPair = keyPairGenerator.genKeyPair();
            return new ECKey[] { (ECPrivateKey) keyPair.getPrivate(), (ECPublicKey) keyPair.getPublic() };
        } catch (NoSuchAlgorithmException e) {
            // Invalid runtime
            throw new RuntimeException("missing key pair generator algorithm EC");
        } catch (InvalidAlgorithmParameterException e) {
            // Impossible, would be programming error
            throw new RuntimeException();
        }
    }

    static public ECPublicKey generatePublicKey() {
        return (ECPublicKey) generateKeys()[1];
    }
}