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 24 /* 25 * @test 26 * @bug 8141039 27 * @library /lib/testlibrary 28 * @summary Check SecureRandom generate expected seed counts what the caller 29 * asked for. 30 * @run main EnoughSeedTest 31 */ 32 import java.security.SecureRandom; 33 import java.security.Security; 34 import static java.lang.Math.*; 35 36 public class EnoughSeedTest { 37 38 private static final String DRBG_CONFIG = "securerandom.drbg.config"; 39 private static final String DRBG_CONFIG_VALUE 40 = Security.getProperty(DRBG_CONFIG); 41 42 public static void main(String[] args) { 43 44 boolean success = true; 45 for (String mech : new String[]{ 46 "SHA1PRNG", "Hash_DRBG", "HMAC_DRBG", "CTR_DRBG"}) { 47 System.out.printf("%nTest for SecureRandom algorithm: '%s'", mech); 48 try { 49 SecureRandom sr = null; 50 if (!mech.contains("_DRBG")) { 51 sr = SecureRandom.getInstance(mech); 52 } else { 53 Security.setProperty(DRBG_CONFIG, mech); 54 sr = SecureRandom.getInstance("DRBG"); 55 } 56 57 success &= forEachSeedBytes(sr); 58 System.out.printf("%nCompleted test for SecureRandom " 59 + "mechanism: '%s'", mech); 60 } catch (Exception e) { 61 success &= false; 62 e.printStackTrace(System.out); 63 } finally { 64 Security.setProperty(DRBG_CONFIG, DRBG_CONFIG_VALUE); 65 } 66 } 67 if (!success) { 68 throw new RuntimeException("At least one test failed."); 69 } 70 } 71 72 /** 73 * Generates fixed number of seed bytes through a SecureRandom instance 74 * to verify it's seed generation status. 75 * @param sr SecureRandom instance 76 * @return The test success indicator 77 */ 78 private static boolean forEachSeedBytes(SecureRandom sr) { 79 boolean success = true; 80 sr.setSeed(1l); 81 for (int seedByte : new int[]{Integer.MIN_VALUE, -1, 0, 1, 256, 1024, 82 Short.MAX_VALUE, (int) pow(2, 20)}) { 83 try { 84 byte[] seed = sr.generateSeed(seedByte); 85 if (seed.length != seedByte) { 86 throw new RuntimeException("Not able to produce expected " 87 + "seed size."); 88 } 89 } catch (IllegalArgumentException e) { 90 if (seedByte >= 0) { 91 throw new RuntimeException("Unknown Exception occured.", e); 92 } 93 System.out.printf("%nPASS - Exception expected when required " 94 + "seed size requested is negative: %s", seedByte); 95 } 96 } 97 return success; 98 } 99 100 }