Java example source code file (TestKATForECB_IV.java)

This example Java source code file (TestKATForECB_IV.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

aes, algo, cipher, crypto, cts, exception, length, math, mode, nopadding, padding, pts, secretkeyspec, security, securityexception, string, testkatforecb_iv, util

The TestKATForECB_IV.java Java example source code

/*
 * Copyright (c) 2002, 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 4635086
 * @library ../UTIL
 * @build TestUtil
 * @run main TestKATForECB_IV
 * @summary Known Answer Test for AES cipher with ECB mode
 * @author Valerie Peng
 */
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.math.*;
import com.sun.crypto.provider.*;

import java.util.*;

public class TestKATForECB_IV
{
    private static final String ALGO = "AES";
    private static final String MODE = "ECB";
    private static final String PADDING = "NoPadding";

    //ecb-iv.txt
    private static String[] PTS = {
        "000102030405060708090A0B0C0D0E0F",
        "000102030405060708090A0B0C0D0E0F",
        "000102030405060708090A0B0C0D0E0F"
    };
    private static String[] CTS = {
        "0A940BB5416EF045F1C39458C653EA5A",
        "0060BFFE46834BB8DA5CF9A61FF220AE",
        "5A6E045708FB7196F02E553D02C3A692"
    };
    private static String[] KEYS = {
        "000102030405060708090A0B0C0D0E0F",
        "000102030405060708090A0B0C0D0E0F1011121314151617",
        "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
    };

    private static SecretKey constructAESKey(String s) throws Exception {
        int len = s.length()/2;
        if ((len != 16) && (len != 24) && (len != 32)) {
            throw new IllegalArgumentException("Wrong Key Length: " + len);
        }
        byte[] rawKeyValue = constructByteArray(s);
        SecretKeySpec key = new SecretKeySpec(rawKeyValue, "AES");
        return key;
    }

    private static byte[] constructByteArray(String s) {
        int len = s.length()/2;
        byte[] tempValue = new byte[len];
        for (int i = 0; i < len; i++) {
            tempValue[i] = Integer.valueOf(s.substring(2*i, 2*i+2),
                                           16).byteValue();
        }
        return tempValue;

    }

    public boolean execute() throws Exception {
        String transformation = ALGO+"/"+MODE+"/"+PADDING;
        Cipher c = Cipher.getInstance(transformation, "SunJCE");
        for (int i=0; i<KEYS.length; i++) {
            SecretKey aesKey = constructAESKey(KEYS[i]);
            if (aesKey.getEncoded().length*8 >
                Cipher.getMaxAllowedKeyLength(transformation)) {
                // skip if this key length is larger than what's
                // configured in the jce jurisdiction policy files
                continue;
            }
            try {
            c.init(Cipher.ENCRYPT_MODE, aesKey);
            byte[] plainText = constructByteArray(PTS[i]);
            byte[] cipherText = c.doFinal(plainText);
            byte[] answer = constructByteArray(CTS[i]);
            if (!Arrays.equals(cipherText, answer)) {
                throw new Exception((i+1) + "th known answer test failed for encryption");
            }

            c.init(Cipher.DECRYPT_MODE, aesKey);
            byte[] recoveredText = c.doFinal(answer);
            if (!Arrays.equals(recoveredText, plainText)) {
                throw new Exception("known answer test failed for decryption");
            }
            System.out.println("Finished KAT for " + aesKey.getEncoded().length + "-byte key");
            } catch (SecurityException se) {
                TestUtil.handleSE(se);
            }
        }

        // passed all tests...hooray!
        return true;
    }

    public static void main (String[] args) throws Exception {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());

        TestKATForECB_IV test = new TestKATForECB_IV();
        String testName = test.getClass().getName() + "[" + ALGO +
            "/" + MODE + "/" + PADDING + "]";
        if (test.execute()) {
            System.out.println(testName + ": Passed!");
        }
    }
}