Quelle Copy.java Sprache: JAVA

/*
* 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.io.Serializable;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Signature;
import java.security.SignedObject;

/*
* @test
* @bug 8050374
* @summary Checks if a signed object is a copy of an original object
*/
public class Copy {

    private static final String DSA = "DSA";
    private static final int KEY_SIZE = 512;
    private static final int MAGIC = 123;

    public static void main(String args[]) throws Exception {
        KeyPairGenerator kg = KeyPairGenerator.getInstance(DSA);
        kg.initialize(KEY_SIZE);
        KeyPair kp = kg.genKeyPair();

        Signature signature = Signature.getInstance(DSA);
        Test original = new Test();
        SignedObject so = new SignedObject(original, kp.getPrivate(),
                signature);
        System.out.println("Signature algorithm: " + so.getAlgorithm());

        signature = Signature.getInstance(DSA, "SUN");
        if (!so.verify(kp.getPublic(), signature)) {
            throw new RuntimeException("Verification failed");
        }

        kg = KeyPairGenerator.getInstance(DSA);
        kg.initialize(KEY_SIZE);
        kp = kg.genKeyPair();

        if (so.verify(kp.getPublic(), signature)) {
            throw new RuntimeException("Unexpected success");
        }

        Object copy = so.getObject();
        if (!original.equals(copy)) {
            throw new RuntimeException("Signed object is not equal "
                    + "to original one: " + copy);
        }

        /*
         * The signed object is a copy of an original one.
         * Once the copy is made, further manipulation
         * of the original object shouldn't has any effect on the copy.
         */
        original.set(MAGIC - 1);
        copy = so.getObject();
        if (original.equals(copy)) {
            throw new RuntimeException("Signed object is not a copy "
                    + "of original one: " + copy);
        }

        System.out.println("Test passed");
    }

    private static class Test implements Serializable {
        private int number = MAGIC;

        public int get() {
            return number;
        }

        public void set(int magic) {
            this.number = magic;
        }

        @Override
        public int hashCode() {
            return number;
        }

        @Override
        public boolean equals(Object obj) {
            if (obj == null) {
                return false;
            }

            if (!(obj instanceof Test)) {
                return false;
            }

            Test other = (Test) obj;
            return number == other.number;
        }

        @Override
        public String toString() {
            return "" + number;
        }
    }
}

quality94%

¤ Dauer der Verarbeitung: 0.12 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.