/*

 * Copyright (c) 2016, 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

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 */

/*

 * @test

 * @bug 8072452

 * @summary Support DHE sizes up to 8192-bits and DSA sizes up to 3072-bits

 * @run main/timeout=300 SupportedDSAParamGen 1024 160

 * @run main/timeout=300 SupportedDSAParamGen 2048 224

 * @run main/timeout=300 SupportedDSAParamGen 2048 256

 */

import java.security.*;

import java.security.spec.*;

import java.security.interfaces.*;

public class SupportedDSAParamGen {

    public static void main(String[] args) throws Exception {

        AlgorithmParameterGenerator apg =

            AlgorithmParameterGenerator.getInstance("DSA", "SUN");

        DSAGenParameterSpec spec = new DSAGenParameterSpec(

                Integer.valueOf(args[0]).intValue(),

                Integer.valueOf(args[1]).intValue());

        System.out.println("Generating (" + spec.getPrimePLength() +

                ", " + spec.getSubprimeQLength() + ") DSA Parameters");

        long start = System.currentTimeMillis();

        apg.init(spec, null);

        AlgorithmParameters param = apg.generateParameters();

        long stop = System.currentTimeMillis();

        System.out.println("Time: " + (stop - start) + " ms.");

        checkParamStrength(param, spec);

    }

    private static void checkParamStrength(AlgorithmParameters param,

            DSAGenParameterSpec genParam) throws Exception {

        String algo = param.getAlgorithm();

        if (!algo.equalsIgnoreCase("DSA")) {

            throw new Exception("Unexpected type of parameters: " + algo);

        }

        DSAParameterSpec spec = param.getParameterSpec(DSAParameterSpec.class);

        int valueL = spec.getP().bitLength();

        int strength = genParam.getPrimePLength();

        if (strength != valueL) {

            System.out.println(

                    "P: Expected " + strength + " but actual " + valueL);

            throw new Exception("Wrong P strength");

        }

        int valueN = spec.getQ().bitLength();

        strength = genParam.getSubprimeQLength();

        if (strength != valueN) {

            System.out.println(

                    "Q: Expected " + strength + " but actual " + valueN);

            throw new Exception("Wrong Q strength");

        }

    }

}