| /* |
| * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6998583 8141039 |
| * @summary NativeSeedGenerator is making 8192 byte read requests from |
| * entropy pool on each init. |
| * @run main/othervm -Djava.security.egd=file:/dev/random SeedGeneratorChoice |
| * @run main/othervm -Djava.security.egd=file:filename SeedGeneratorChoice |
| */ |
| |
| /* |
| * Side testcase introduced to ensure changes for 6998583 will always |
| * succeed in falling back to ThreadedSeedGenerator if issues are found |
| * with the native OS generator request. We should never see an exception |
| * causing exit. |
| * We should always fall back to the ThreadedSeedGenerator if exceptions |
| * are encountered with user defined source of entropy. |
| */ |
| import java.security.SecureRandom; |
| import java.security.Security; |
| |
| public class SeedGeneratorChoice { |
| |
| public static void main(String... arguments) throws Exception { |
| for (String mech : new String[]{"SHA1PRNG", "Hash_DRBG", "HMAC_DRBG", |
| "CTR_DRBG"}) { |
| |
| SecureRandom prng = null; |
| if (!mech.contains("_DRBG")) { |
| prng = SecureRandom.getInstance(mech); |
| } else { |
| Security.setProperty("securerandom.drbg.config", mech); |
| prng = SecureRandom.getInstance("DRBG"); |
| } |
| prng.generateSeed(1); |
| } |
| } |
| |
| } |