/*

 * Copyright (c) 2015, 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.

 */

import java.security.InvalidKeyException;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.Signature;

import java.security.SignatureException;

import java.util.List;

/*

 * Utilities for testing the signature algorithm OIDs.

 */

public class TestSignatureOidHelper {

    private static final byte[] INPUT = "1234567890".getBytes();

    private final String algorithm;

    private final String provider;

    private final int keySize;

    private final List<OidAlgorithmPair> data;

    public TestSignatureOidHelper(String algorithm, String provider,

            int keySize, List<OidAlgorithmPair> data) {

        this.algorithm = algorithm;

        this.provider = provider;

        this.keySize = keySize;

        this.data = data;

    }

    public void execute() throws Exception {

        KeyPair keyPair = createKeyPair();

        for (OidAlgorithmPair oidAlgorithmPair : data) {

            runTest(oidAlgorithmPair, keyPair);

            System.out.println("passed");

        }

        System.out.println("All tests passed");

    }

    private KeyPair createKeyPair()

            throws NoSuchAlgorithmException, NoSuchProviderException {

        KeyPairGenerator keyGen = KeyPairGenerator.getInstance(algorithm,

                provider);

        keyGen.initialize(keySize);

        return keyGen.generateKeyPair();

    }

    private void runTest(OidAlgorithmPair oidAlgorithmPair, KeyPair keyPair)

            throws NoSuchAlgorithmException, NoSuchProviderException,

            InvalidKeyException, SignatureException {

        Signature sgAlgorithm =

                Signature.getInstance(oidAlgorithmPair.algorithm, provider);

        Signature sgOid = Signature.getInstance(oidAlgorithmPair.oid, provider);

        if (sgAlgorithm == null) {

            throw new RuntimeException(String.format(

                    "Test failed: algorithm string %s getInstance failed.%n",

                    oidAlgorithmPair.algorithm));

        }

        if (sgOid == null) {

            throw new RuntimeException(

                    String.format("Test failed: OID %s getInstance failed.%n",

                            oidAlgorithmPair.oid));

        }

        if (!sgAlgorithm.getAlgorithm().equals(oidAlgorithmPair.algorithm)) {

            throw new RuntimeException(String.format(

                    "Test failed: algorithm string %s getInstance "

                            + "doesn't generate expected algorithm.%n",

                    oidAlgorithmPair.algorithm));

        }

        sgAlgorithm.initSign(keyPair.getPrivate());

        sgAlgorithm.update(INPUT);

        sgOid.initVerify(keyPair.getPublic());

        sgOid.update(INPUT);

        if (!sgOid.verify(sgAlgorithm.sign())) {

            throw new RuntimeException(

                    "Signature verification failed unexpectedly");

        }

    }

}

class OidAlgorithmPair {

    public final String oid;

    public final String algorithm;

    public OidAlgorithmPair(String oid, String algorithm) {

        this.oid = oid;

        this.algorithm = algorithm;

    }

    @Override

    public String toString() {

        return "[oid=" + oid + ", algorithm=" + algorithm + "]";

    }

}