1 /*
   2  * Copyright (c) 2003, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 4800108 8181048
  27  * @summary verify that precomputed DSA parameters are always used (512, 768, 1024, 2048 bit)
  28  * @run main/othervm/timeout=15 TestKeyPairGenerator
  29  */
  30 
  31 // this fix is really a performance fix, so this test is not foolproof
  32 // without it, it will take a minute or more (unless you have a very fast machine)
  33 // with the fix, the test should complete in <2 seconds
  34 // use 15 second timeout to leave some room
  35 
  36 import java.security.*;
  37 import java.security.interfaces.*;
  38 
  39 public class TestKeyPairGenerator {
  40 
  41     private static void checkKeyLength(KeyPair kp, int len) throws Exception {
  42         DSAPublicKey key = (DSAPublicKey)kp.getPublic();
  43         int n = key.getParams().getP().bitLength();
  44         System.out.println("Key length: " + n);
  45         if (len != n) {
  46             throw new Exception("Wrong key length");
  47         }
  48     }
  49 
  50     public static void main(String[] args) throws Exception {
  51         long start = System.currentTimeMillis();
  52         KeyPairGenerator kpg;
  53         KeyPair kp;
  54         // problem was when not calling initialize()
  55         // do that twice to artifically inflate the time
  56         // on JDKs that do not have the fix
  57         kpg = KeyPairGenerator.getInstance("DSA", "SUN");
  58         kp = kpg.generateKeyPair();
  59 
  60         kpg = KeyPairGenerator.getInstance("DSA", "SUN");
  61         kp = kpg.generateKeyPair();
  62 
  63         // some other basic tests
  64         kp = kpg.generateKeyPair();
  65 
  66         kpg.initialize(1024);
  67         kp = kpg.generateKeyPair();
  68         checkKeyLength(kp, 1024);
  69 
  70         kpg.initialize(768);
  71         kp = kpg.generateKeyPair();
  72         checkKeyLength(kp, 768);
  73 
  74         kpg.initialize(512);
  75         kp = kpg.generateKeyPair();
  76         checkKeyLength(kp, 512);
  77 
  78         kpg.initialize(2048);
  79         kp = kpg.generateKeyPair();
  80         checkKeyLength(kp, 2048);
  81 
  82         long stop = System.currentTimeMillis();
  83         System.out.println("Time: " + (stop - start) + " ms.");
  84     }
  85 
  86 }