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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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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import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.*;
import java.util.Arrays;
import java.util.stream.IntStream;
import static javax.crypto.Cipher.PRIVATE_KEY;
import static javax.crypto.Cipher.PUBLIC_KEY;

/**
 * @test
 * @bug 8146293
 * @summary Test RSASSA-PSS AlgorithmParameters impl of SunRsaSign provider.
 * @run main PSSParametersTest
 */
public class PSSParametersTest {
    /**
     * JDK default RSA Provider.
     */
    private static final String PROVIDER = "SunRsaSign";

    private static final String ALGO = "RSASSA-PSS";

    public static void main(String[] args) throws Exception {
        System.out.println("Testing against DEFAULT parameters");
        test(PSSParameterSpec.DEFAULT);
        System.out.println("Testing against custom parameters");
        test(new PSSParameterSpec("SHA-512/224", "MGF1", MGF1ParameterSpec.SHA384,
            100, 1));
        System.out.println("Test Passed");
    }

    // test against the given spec by initializing w/ it, generate the DER bytes,
    // then initialize another instance w/ the DER bytes, retrieve the spec.
    // compare both spec for equality and throw exception if the comparison failed.
    private static void test(PSSParameterSpec spec) throws Exception {
        AlgorithmParameters params = AlgorithmParameters.getInstance(ALGO, PROVIDER);
        params.init(spec);
        byte[] encoded = params.getEncoded();
        AlgorithmParameters params2 = AlgorithmParameters.getInstance(ALGO, PROVIDER);
        params2.init(encoded);
        PSSParameterSpec spec2 = params2.getParameterSpec(PSSParameterSpec.class);
        if (!isEqual(spec, spec2)) {
            throw new RuntimeException("Spec check Failed");
        }
    }

    private static boolean isEqual(PSSParameterSpec spec, PSSParameterSpec spec2)
        throws Exception {
        if (spec == spec2) return true;
        if (spec == null || spec2 == null) return false;

        if (!spec.getDigestAlgorithm().equals(spec2.getDigestAlgorithm())) {
            System.out.println("Different digest algorithms: " +
                spec.getDigestAlgorithm() + " vs " + spec2.getDigestAlgorithm());
            return false;
        }
        if (!spec.getMGFAlgorithm().equals(spec2.getMGFAlgorithm())) {
            System.out.println("Different MGF algorithms: " +
                spec.getMGFAlgorithm() + " vs " + spec2.getMGFAlgorithm());
            return false;
        }
        if (spec.getSaltLength() != spec2.getSaltLength()) {
            System.out.println("Different Salt Length: " +
                spec.getSaltLength() + " vs " + spec2.getSaltLength());
            return false;
        }
        if (spec.getTrailerField() != spec2.getTrailerField()) {
            System.out.println("Different TrailerField: " +
                spec.getTrailerField() + " vs " + spec2.getTrailerField());
            return false;
        }
        // continue checking MGF Parameters
        AlgorithmParameterSpec mgfParams = spec.getMGFParameters();
        AlgorithmParameterSpec mgfParams2 = spec2.getMGFParameters();
        if (mgfParams == mgfParams2) return true;
        if (mgfParams == null || mgfParams2 == null) {
            System.out.println("Different MGF Parameters: " +
                mgfParams + " vs " + mgfParams2);
            return false;
        }
        if (mgfParams instanceof MGF1ParameterSpec) {
            if (mgfParams2 instanceof MGF1ParameterSpec) {
                boolean result =
                    ((MGF1ParameterSpec)mgfParams).getDigestAlgorithm().equals
                         (((MGF1ParameterSpec)mgfParams2).getDigestAlgorithm());
                if (!result) {
                    System.out.println("Different Digest algo in MGF Parameters: " +
                        ((MGF1ParameterSpec)mgfParams).getDigestAlgorithm() + " vs " +
                        ((MGF1ParameterSpec)mgfParams2).getDigestAlgorithm());
                }
                return result;
            } else {
                System.out.println("Different MGF Parameters types: " +
                    mgfParams.getClass() + " vs " + mgfParams2.getClass());
                return false;
            }
        }
        throw new RuntimeException("Unrecognized MGFParameters: " + mgfParams);
    }
}