test/com/sun/crypto/provider/KeyGenerator/Test4628062.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 * 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,
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 *
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 */

/*
 * @test
 * @bug 4628062
 * @summary Verify that AES KeyGenerator supports default initialization
 *      when init is not called
 * @author Valerie Peng
 */
import java.security.*;
import javax.crypto.*;
import java.util.*;

public class Test4628062 {

    private static final String ALGO = "AES";
    private static final int[] KEYSIZES =
        { 16, 24, 32 }; // in bytes

    public boolean execute() throws Exception {
        KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE");

        // TEST FIX 4628062
        Key keyWithDefaultSize = kg.generateKey();
        byte[] encoding = keyWithDefaultSize.getEncoded();
        if (encoding.length == 0) {
            throw new Exception("default key length is 0!");
        }

        // BONUS TESTS
        // 1. call init(int keysize) with various valid key sizes
        // and see if the generated key is the right size.
        for (int i=0; i<KEYSIZES.length; i++) {
            kg.init(KEYSIZES[i]*8); // in bits
            Key key = kg.generateKey();
            if (key.getEncoded().length != KEYSIZES[i]) {
                throw new Exception("key is generated with the wrong length!");
            }
        }
        // 2. call init(int keysize) with invalid key size and see
        // if the expected InvalidParameterException is thrown.
        try {
            kg.init(KEYSIZES[0]*8+1);
        } catch (InvalidParameterException ex) {
        } catch (Exception ex) {
            throw new Exception("wrong exception is thrown for invalid key size!");
        }

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

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

        Test4628062 test = new Test4628062();
        String testName = test.getClass().getName();
        if (test.execute()) {
            System.out.println(testName + ": Passed!");
        }
    }
}