1 /*
   2  * Copyright (c) 2010, 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 6998583
  27  * @summary NativeSeedGenerator is making 8192 byte read requests from
  28  *             entropy pool on each init.
  29  * @run main SeedGeneratorChoice
  30  * @run main/othervm -Djava.security.egd=file:/dev/random SeedGeneratorChoice
  31  * @run main/othervm -Djava.security.egd=file:filename  SeedGeneratorChoice
  32  */
  33 
  34 /*
  35  * Side testcase introduced to ensure changes for 6998583 will always
  36  * succeed in falling back to ThreadedSeedGenerator if issues are found
  37  * with the native OS generator request. We should never see an exception
  38  * causing exit.
  39  * We should always fall back to the ThreadedSeedGenerator if exceptions
  40  * are encountered with user defined source of entropy.
  41  */
  42 
  43 import java.security.SecureRandom;
  44 
  45 public class SeedGeneratorChoice {
  46 
  47     public static void main(String... arguments) throws Exception {
  48         byte[] bytes;
  49         SecureRandom prng = SecureRandom.getInstance("SHA1PRNG");
  50         bytes = prng.generateSeed(1);
  51     }
  52 }