/*
 * Copyright (c) 2023, 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.
 *
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 */

/*
 * @test
 * @bug 8300399
 * @summary EdDSA does not verify when there is no message
 * @run main EmptyMessage
 */
import java.security.KeyPairGenerator;
import java.security.Signature;
import java.security.spec.NamedParameterSpec;

public class EmptyMessage {
    public static void main(String[] args) throws Exception {
        var g = KeyPairGenerator.getInstance("EdDSA");
        g.initialize(NamedParameterSpec.ED25519);
        var kp = g.generateKeyPair();

        var ss = Signature.getInstance("EdDSA");
        ss.initSign(kp.getPrivate());
        var sig = ss.sign();

        var ps = Signature.getInstance("EdDSA");
        ps.initVerify(kp.getPublic());
        if (!ps.verify(sig)) {
            throw new RuntimeException();
        }
    }
}