/*
* Copyright (c) 1998, 2003, 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.
*
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*/
/**
* @test
* @bug 4168409
* @summary SecureRandom forces all instances to self-seed, even if a seed is
* provided
*/
import java.security.SecureRandom;
public class SelfSeed {
private static final int NUM_BYTES = 5;
private static byte seed[] = { (byte)0xaa, (byte)0x11, (byte)0xa1 };
public static void main(String[] args) {
try {
SecureRandom sr1 = SecureRandom.getInstance("SHA1PRNG");
sr1.setSeed(seed);
byte randomBytes[] = new byte[NUM_BYTES];
sr1.nextBytes(randomBytes);
SecureRandom sr2 = new SecureRandom(seed);
if (sr2.getAlgorithm().equals("SHA1PRNG") == false) {
System.out.println("Default PRNG is not SHA1PRNG, skipping test");
return;
}
byte otherRandomBytes[] = new byte[NUM_BYTES];
sr2.nextBytes(otherRandomBytes);
// make sure the random bytes generated are the same
for (int i = 0; i < NUM_BYTES; i++) {
if (randomBytes[i] != otherRandomBytes[i])
throw new SecurityException("FAILURE: " +
"Returned bytes not equal");
}
// success
} catch (Exception e) {
throw new SecurityException("FAILURE: " + e.toString());
}
}
}