1 /*
   2  * Copyright (c) 2016, 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 import java.security.SecureRandom;
  24 import java.security.Security;
  25 
  26 /**
  27  * @test
  28  * @bug 8051408
  29  * @summary make sure nextBytes etc can be called before setSeed
  30  */
  31 public class AutoReseed {
  32 
  33     public static void main(String[] args) throws Exception {
  34         SecureRandom sr;
  35         String old = Security.getProperty("drbg");
  36         try {
  37             for (String mech : new String[]{"Hash_DRBG", "HMAC_DRBG", "CTR_DRBG"}) {
  38                 System.out.println("Testing " + mech + "...");
  39                 Security.setProperty("drbg", mech);
  40 
  41                 // Check auto reseed works
  42                 sr = SecureRandom.getInstance("DRBG");
  43                 sr.nextInt();
  44                 sr = SecureRandom.getInstance("DRBG");
  45                 sr.reseed();
  46                 sr = SecureRandom.getInstance("DRBG");
  47                 sr.generateSeed(10);
  48             }
  49         } finally {
  50             Security.setProperty("drbg", old);
  51         }
  52     }
  53 }