1 /*
   2  * Copyright (c) 2006, 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 6449335
  27  * @summary MSCAPI's PRNG is too slow
  28  * @key randomness
  29  */
  30 
  31 import java.security.SecureRandom;
  32 
  33 public class PrngSlow {
  34 
  35     public static void main(String[] args) throws Exception {
  36         double t = 0.0;
  37         try {
  38             SecureRandom sr = null;
  39             sr = SecureRandom.getInstance("PRNG", "SunMSCAPI");
  40             long start = System.nanoTime();
  41             int x = 0;
  42             for(int i = 0; i < 10000; i++) {
  43                 if (i % 100 == 0) System.err.print(".");
  44                 if (sr.nextBoolean()) x++;
  45             };
  46             t = (System.nanoTime() - start) / 1000000000.0;
  47             System.err.println("\nSpend " + t + " seconds");
  48         } catch (Exception e) {
  49             // Not supported here, maybe not a Win32
  50             System.err.println("Cannot find PRNG for SunMSCAPI or other mysterious bugs");
  51             e.printStackTrace();
  52             return;
  53         }
  54         if (t > 5)
  55             throw new RuntimeException("Still too slow");
  56     }
  57 }