1 /*

     2  * Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug     5078280

    27  * @summary make sure generated key pairs are exactly the requested length

    28  * @author  Andreas Sterbenz

    29  */

    30 

    31 import java.security.*;

    32 import java.security.interfaces.*;

    33 

    34 public class TestKeyPairGeneratorLength {

    35 

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

    37         test(512);

    38         test(513);

    39         System.out.println("Done.");

    40     }

    41 

    42     private static void test(int len) throws Exception {

    43         KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", "SunRsaSign");

    44         kpg.initialize(len);

    45         for (int i = 0; i < 6; i++) {

    46             System.out.println("Generating keypair " + len + " bit keypair " + (i + 1) + "...");

    47             KeyPair kp = kpg.generateKeyPair();

    48             RSAPublicKey key = (RSAPublicKey)kp.getPublic();

    49             int k = key.getModulus().bitLength();

    50             if (k != len) {

    51                 throw new Exception("length mismatch: " + k);

    52             }

    53         }

    54     }

    55 

    56 }