| /* |
| * Copyright (c) 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 8141039 |
| * @library /lib/testlibrary |
| * @summary Check SecureRandom generate expected seed counts what the caller |
| * asked for. |
| * @run main/othervm EnoughSeedTest |
| */ |
| import java.security.SecureRandom; |
| import java.security.Security; |
| import static java.lang.Math.*; |
| |
| public class EnoughSeedTest { |
| |
| private static final String DRBG_CONFIG = "securerandom.drbg.config"; |
| private static final String DRBG_CONFIG_VALUE |
| = Security.getProperty(DRBG_CONFIG); |
| |
| public static void main(String[] args) { |
| System.setProperty("java.security.egd", "file:/dev/urandom"); |
| |
| boolean success = true; |
| for (String mech : new String[]{ |
| "SHA1PRNG", "Hash_DRBG", "HMAC_DRBG", "CTR_DRBG"}) { |
| System.out.printf("%nTest for SecureRandom algorithm: '%s'", mech); |
| try { |
| SecureRandom sr = null; |
| if (!mech.contains("_DRBG")) { |
| sr = SecureRandom.getInstance(mech); |
| } else { |
| Security.setProperty(DRBG_CONFIG, mech); |
| sr = SecureRandom.getInstance("DRBG"); |
| } |
| |
| success &= forEachSeedBytes(sr); |
| System.out.printf("%nCompleted test for SecureRandom " |
| + "mechanism: '%s'", mech); |
| } catch (Exception e) { |
| success &= false; |
| e.printStackTrace(System.out); |
| } finally { |
| Security.setProperty(DRBG_CONFIG, DRBG_CONFIG_VALUE); |
| } |
| } |
| if (!success) { |
| throw new RuntimeException("At least one test failed."); |
| } |
| } |
| |
| /** |
| * Generates fixed number of seed bytes through a SecureRandom instance |
| * to verify it's seed generation status. |
| * @param sr SecureRandom instance |
| * @return The test success indicator |
| */ |
| private static boolean forEachSeedBytes(SecureRandom sr) { |
| boolean success = true; |
| sr.setSeed(1l); |
| for (int seedByte : new int[]{Integer.MIN_VALUE, -1, 0, 1, 256, 1024, |
| Short.MAX_VALUE, (int) pow(2, 20)}) { |
| try { |
| byte[] seed = sr.generateSeed(seedByte); |
| if (seed.length != seedByte) { |
| throw new RuntimeException("Not able to produce expected " |
| + "seed size."); |
| } |
| } catch (IllegalArgumentException e) { |
| if (seedByte >= 0) { |
| throw new RuntimeException("Unknown Exception occured.", e); |
| } |
| System.out.printf("%nPASS - Exception expected when required " |
| + "seed size requested is negative: %s", seedByte); |
| } |
| } |
| return success; |
| } |
| |
| } |