/*
* Copyright ( c ) 2016 , 2022 , 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
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*/
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Date;
import java.util.concurrent.atomic.AtomicBoolean;
/*
* @ test
* @ bug 7004967
* @ run main / othervm - Djava . security . egd = file : / dev / urandom NoSync
* @ summary SecureRandom should be more explicit about threading
*/
public class NoSync {
public static void main(String[] args) throws Exception {
for (Provider p : Security.getProviders()) {
for (Provider.Service s : p.getServices()) {
if (s.getType().equals("SecureRandom" ) &&
!s.getAlgorithm().contains("Block" )) {
test(SecureRandom.getInstance(s.getAlgorithm(), p));
}
}
}
Security.setProperty("securerandom.drbg.config" , "HMAC_DRBG" );
test(SecureRandom.getInstance("DRBG" ));
Security.setProperty("securerandom.drbg.config" , "CTR_DRBG" );
test(SecureRandom.getInstance("DRBG" ));
}
static void test(SecureRandom sr) throws Exception {
test(sr, 20 , 3000 );
// All out-of-box impl should have the ThreadSafe attribute
String attr = sr.getProvider().getProperty("SecureRandom."
+ sr.getAlgorithm() + " ThreadSafe" );
if (!"true" .equals(attr)) {
throw new Exception("Not ThreadSafe: " + attr);
}
}
public static void test(SecureRandom sr, int tnum, int rnum)
throws Exception {
System.out.println(sr);
System.out.println(sr.getAlgorithm() + " " + sr.getProvider().getName());
System.out.println(new Date());
boolean reseed = sr.getParameters() != null ;
Thread [] threads = new Thread [tnum];
AtomicBoolean failed = new AtomicBoolean(false );
Thread .UncaughtExceptionHandler h = (t, e) -> {
failed.set(true );
e.printStackTrace();
};
for (int i = 0 ; i < threads.length; i++) {
threads[i] = new Thread () {
@Override
public void run() {
for (int j = 0 ; j < rnum; j++) {
sr.nextBytes(new byte [j%100 +100 ]);
sr.setSeed((long )j);
if (reseed) {
sr.reseed();
}
}
}
};
threads[i].setUncaughtExceptionHandler(h);
threads[i].start();
}
for (int i = 0 ; i < threads.length; i++) {
threads[i].join();
}
System.out.println(new Date());
System.out.println();
if (failed.get()) {
throw new RuntimeException("Failed" );
}
}
}
Messung V0.5 in Prozent C=98 H=56 G=79
¤ Dauer der Verarbeitung: 0.13 Sekunden
(vorverarbeitet am 2026-10-11)
¤
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