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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 When random number is generated through the a SecureRandom instance
* as well from it's serialized instance in the same time then the
* generated random numbers should be different when one or both are
* reseeded.
* @run main/othervm -Djava.security.egd=file:/dev/urandom SerializedSeedTest
*/
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ByteArrayInputStream;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.Security;
import jdk.testlibrary.Asserts;
public class SerializedSeedTest {
private static final byte[] SEED = "seed".getBytes();
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) {
boolean success = true;
for (String mech : new String[]{
"SHA1PRNG", "Hash_DRBG", "HMAC_DRBG", "CTR_DRBG"}) {
System.out.printf(
"%nRunning test for SecureRandom mechanism: '%s'", mech);
try {
// Serialize without seed and compare generated random numbers
// produced through original and serialized instances.
SecureRandom orig = getSRInstance(mech);
SecureRandom copy = deserializedCopy(orig);
System.out.printf("%nSerialize without seed. Generated random"
+ " numbers should be different.");
check(orig, copy, false, mech);
// Serialize after default seed and compare generated random
// numbers produced through original and serialized instances.
orig = getSRInstance(mech);
orig.nextInt(); // Default seeded
copy = deserializedCopy(orig);
System.out.printf("%nSerialize after default seed. Generated"
+ " random numbers should be same till 20-bytes.");
check(orig, copy, !isDRBG(mech), mech);
// Serialize after explicit seed and compare generated random
// numbers produced through original and serialized instances.
orig = getSRInstance(mech);
orig.setSeed(SEED); // Explicitly seeded
copy = deserializedCopy(orig);
System.out.printf("%nSerialize after explicit seed. Generated "
+ "random numbers should be same till 20-bytes.");
check(orig, copy, !isDRBG(mech), mech);
// Serialize without seed but original is explicitly seeded
// before generating any random number. Then compare generated
// random numbers produced through original and serialized
// instances.
orig = getSRInstance(mech);
copy = deserializedCopy(orig);
orig.setSeed(SEED); // Explicitly seeded
System.out.printf("%nSerialize without seed. When original is "
+ "explicitly seeded before generating random numbers,"
+ " Generated random numbers should be different.");
check(orig, copy, false, mech);
// Serialize after default seed but original is explicitly
// seeded before generating any random number. Then compare
// generated random numbers produced through original and
// serialized instances.
orig = getSRInstance(mech);
orig.nextInt(); // Default seeded
copy = deserializedCopy(orig);
orig.setSeed(SEED); // Explicitly seeded
System.out.printf("%nSerialize after default seed but original "
+ "is explicitly seeded before generating random number"
+ ". Generated random numbers should be different.");
check(orig, copy, false, mech);
// Serialize after explicit seed but original is explicitly
// seeded again before generating random number. Then compare
// generated random numbers produced through original and
// serialized instances.
orig = getSRInstance(mech);
orig.setSeed(SEED); // Explicitly seeded
copy = deserializedCopy(orig);
orig.setSeed(SEED); // Explicitly seeded
System.out.printf("%nSerialize after explicit seed but "
+ "original is explicitly seeded again before "
+ "generating random number. Generated random "
+ "numbers should be different.");
check(orig, copy, false, mech);
} catch (Exception e) {
e.printStackTrace(System.out);
success = false;
} finally {
Security.setProperty(DRBG_CONFIG, DRBG_CONFIG_VALUE);
}
System.out.printf("%n------Completed Test for %s------", mech);
}
if (!success) {
throw new RuntimeException("At least one test failed.");
}
}
/**
* Find if the mechanism is a DRBG mechanism.
* @param mech Mechanism name
* @return True for DRBG mechanism else False
*/
private static boolean isDRBG(String mech) {
return mech.contains("_DRBG");
}
/**
* Verify the similarity of random numbers generated though both original
* as well as deserialized instance.
*/
private static void check(SecureRandom orig, SecureRandom copy,
boolean equal, String mech) {
int o = orig.nextInt();
int c = copy.nextInt();
System.out.printf("%nRandom number generated for mechanism: '%s' "
+ "from original instance as: '%s' and from serialized "
+ "instance as: '%s'", mech, o, c);
if (equal) {
Asserts.assertEquals(o, c, mech);
} else {
Asserts.assertNotEquals(o, c, mech);
}
}
/**
* Get a copy of SecureRandom instance through deserialization.
* @param orig Original SecureRandom instance
* @return Deserialized SecureRandom instance
* @throws IOException
* @throws ClassNotFoundException
*/
private static SecureRandom deserializedCopy(SecureRandom orig)
throws IOException, ClassNotFoundException {
return deserialize(serialize(orig));
}
/**
* Deserialize the SecureRandom object.
*/
private static SecureRandom deserialize(byte[] serialized)
throws IOException, ClassNotFoundException {
SecureRandom sr = null;
try (ByteArrayInputStream bis = new ByteArrayInputStream(serialized);
ObjectInputStream ois = new ObjectInputStream(bis)) {
sr = (SecureRandom) ois.readObject();
}
return sr;
}
/**
* Serialize the given SecureRandom object.
*/
private static byte[] serialize(SecureRandom sr) throws IOException {
try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos)) {
oos.writeObject(sr);
return bos.toByteArray();
}
}
/**
* Create a SecureRandom instance for a given mechanism.
*/
private static SecureRandom getSRInstance(String mech)
throws NoSuchAlgorithmException {
if (!isDRBG(mech)) {
return SecureRandom.getInstance(mech);
} else {
Security.setProperty(DRBG_CONFIG, mech);
return SecureRandom.getInstance("DRBG");
}
}
}
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