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/*
* 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;
}
}
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