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 }