83 lines
2.8 KiB
Java
83 lines
2.8 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 6425477
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* @summary Better support for generation of high entropy random numbers
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* @run main/othervm StrongSeedReader
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*/
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import java.io.*;
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import java.net.*;
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import java.security.SecureRandom;
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/**
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* A simple test which takes into account knowledge about the underlying
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* implementation. This may change if the implementations change.
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*
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* Create a new EGD file with known bytes, then set the EGD System property. The
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* data read should be the same as what was written.
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*/
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public class StrongSeedReader {
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public static void main(String[] args) throws Exception {
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// Skip Windows, the SHA1PRNG uses CryptGenRandom.
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if (System.getProperty("os.name", "unknown").startsWith("Windows")) {
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return;
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}
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File file = null;
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try {
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file = new File(System.getProperty("java.io.tmpdir"),
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"StrongSeedReader.tmpdata");
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// write a bunch of 0's to the file.
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FileOutputStream fos = new FileOutputStream(file);
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fos.write(new byte[2048]);
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System.setProperty("java.security.egd", file.toURI().toString());
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testSeed("NativePRNG");
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testSeed("SHA1PRNG");
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testSeed("DRBG");
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} finally {
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if (file != null) {
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file.delete();
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}
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}
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}
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private static void testSeed(String alg) throws Exception {
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System.out.println("Testing: " + alg);
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SecureRandom sr = SecureRandom.getInstance(alg);
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byte[] ba = sr.generateSeed(20);
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// We should get back a bunch of zeros from the file.
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for (byte b : ba) {
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if (b != 0) {
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throw new Exception("Byte != 0");
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}
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}
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}
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}
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