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Java example source code file (CheckWeakKeys.java)

This example Java source code file (CheckWeakKeys.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

checkweakkeys, deskeyspec, exception, failed

The CheckWeakKeys.java Java example source code

/*
 * Copyright (c) 2005, 2007, 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.
 */

/*
 * @test
 * @bug 6340919
 * @summary Incorrect list of keys reported as weak by DESKeySpec.isWeak()
 * @author Brad R. Wetmore
 */
import javax.crypto.spec.DESKeySpec;

public class CheckWeakKeys {

    /**
     * Weak/semi-weak keys copied from FIPS 74.
     *
     * "...The first 6 keys have duals different than themselves, hence
     * each is both a key and a dual giving 12 keys with duals. The last
     * four keys equal their duals, and are called self-dual keys..."
     *
     * 1.   E001E001F101F101    01E001E001F101F1
     * 2.   FE1FFE1FFEOEFEOE    1FFE1FFEOEFEOEFE
     * 3.   E01FE01FF10EF10E    1FE01FEOOEF10EF1
     * 4.   01FE01FE01FE01FE    FE01FE01FE01FE01
     * 5.   011F011F010E010E    1F011F010E010E01
     * 6.   E0FEE0FEF1FEF1FE    FEE0FEE0FEF1FEF1
     * 7.   0101010101010101    0101010101010101
     * 8.   FEFEFEFEFEFEFEFE    FEFEFEFEFEFEFEFE
     * 9.   E0E0E0E0F1F1F1F1    E0E0E0E0F1F1F1F1
     * 10.  1F1F1F1F0E0E0E0E    1F1F1F1F0E0E0E0E
     */
    static private byte [][] weakKeys = {
        { (byte)0xE0, (byte)0x01, (byte)0xE0, (byte)0x01,
          (byte)0xF1, (byte)0x01, (byte)0xF1, (byte)0x01 },

        { (byte)0x01, (byte)0xE0, (byte)0x01, (byte)0xE0,
          (byte)0x01, (byte)0xF1, (byte)0x01, (byte)0xF1 },

        { (byte)0xFE, (byte)0x1F, (byte)0xFE, (byte)0x1F,
          (byte)0xFE, (byte)0x0E, (byte)0xFE, (byte)0x0E },

        { (byte)0x1F, (byte)0xFE, (byte)0x1F, (byte)0xFE,
          (byte)0x0E, (byte)0xFE, (byte)0x0E, (byte)0xFE },

        { (byte)0xE0, (byte)0x1F, (byte)0xE0, (byte)0x1F,
          (byte)0xF1, (byte)0x0E, (byte)0xF1, (byte)0x0E },

        { (byte)0x1F, (byte)0xE0, (byte)0x1F, (byte)0xE0,
          (byte)0x0E, (byte)0xF1, (byte)0x0E, (byte)0xF1 },

        { (byte)0x01, (byte)0xFE, (byte)0x01, (byte)0xFE,
          (byte)0x01, (byte)0xFE, (byte)0x01, (byte)0xFE },

        { (byte)0xFE, (byte)0x01, (byte)0xFE, (byte)0x01,
          (byte)0xFE, (byte)0x01, (byte)0xFE, (byte)0x01 },

        { (byte)0x01, (byte)0x1F, (byte)0x01, (byte)0x1F,
          (byte)0x01, (byte)0x0E, (byte)0x01, (byte)0x0E },

        { (byte)0x1F, (byte)0x01, (byte)0x1F, (byte)0x01,
          (byte)0x0E, (byte)0x01, (byte)0x0E, (byte)0x01 },

        { (byte)0xE0, (byte)0xFE, (byte)0xE0, (byte)0xFE,
          (byte)0xF1, (byte)0xFE, (byte)0xF1, (byte)0xFE },

        { (byte)0xFE, (byte)0xE0, (byte)0xFE, (byte)0xE0,
          (byte)0xFE, (byte)0xF1, (byte)0xFE, (byte)0xF1 },

        { (byte)0x01, (byte)0x01, (byte)0x01, (byte)0x01,
          (byte)0x01, (byte)0x01, (byte)0x01, (byte)0x01 },

        { (byte)0xFE, (byte)0xFE, (byte)0xFE, (byte)0xFE,
          (byte)0xFE, (byte)0xFE, (byte)0xFE, (byte)0xFE },

        { (byte)0xE0, (byte)0xE0, (byte)0xE0, (byte)0xE0,
          (byte)0xF1, (byte)0xF1, (byte)0xF1, (byte)0xF1 },

        { (byte)0x1F, (byte)0x1F, (byte)0x1F, (byte)0x1F,
          (byte)0x0E, (byte)0x0E, (byte)0x0E, (byte)0x0E }
    };

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

        boolean failed = false;

        for (int i = 0; i < weakKeys.length; i++) {
            DESKeySpec desSpec = new DESKeySpec(weakKeys[i]);
            if (!DESKeySpec.isWeak(weakKeys[i], 0)) {
                failed = true;
                System.out.println("Entry " + i + " should be weak");
            }
        }

        if (failed) {
            throw new Exception("Failed test!!!");
        }

        System.out.println("Passed test.");
    }
}

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