1 /* 2 * Copyright (c) 2010, 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 24 /* 25 * @test 26 * @bug 6998583 8141039 27 * @summary NativeSeedGenerator is making 8192 byte read requests from 28 * entropy pool on each init. 29 * @run main/othervm -Djava.security.egd=file:/dev/random SeedGeneratorChoice 30 * @run main/othervm -Djava.security.egd=file:filename SeedGeneratorChoice 31 */ 32 33 /* 34 * Side testcase introduced to ensure changes for 6998583 will always 35 * succeed in falling back to ThreadedSeedGenerator if issues are found 36 * with the native OS generator request. We should never see an exception 37 * causing exit. 38 * We should always fall back to the ThreadedSeedGenerator if exceptions 39 * are encountered with user defined source of entropy. 40 */ 41 import java.security.SecureRandom; 42 import java.security.Security; 43 44 public class SeedGeneratorChoice { 45 46 public static void main(String... arguments) throws Exception { 47 for (String mech : new String[]{"SHA1PRNG", "Hash_DRBG", "HMAC_DRBG", 48 "CTR_DRBG"}) { 49 50 SecureRandom prng = null; 51 if (!mech.contains("_DRBG")) { 52 prng = SecureRandom.getInstance(mech); 53 } else { 54 Security.setProperty("securerandom.drbg.config", mech); 55 prng = SecureRandom.getInstance("DRBG"); 56 } 57 prng.generateSeed(1); 58 } 59 } 60 61 }