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// Tags: JDK1.2
// Copyright (C) 2003 Free Software Foundation, Inc.
// This file is part of Mauve.
// Mauve is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
// Mauve 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 for more details.
// You should have received a copy of the GNU General Public License
// along with Mauve; see the file COPYING. If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA. */
package gnu.testlet.java.security.SecureRandom;
import gnu.testlet.Testlet;
import gnu.testlet.TestHarness;
import java.security.SecureRandom;
import java.security.NoSuchAlgorithmException;
//import java.security.NoSuchProviderException;
public class SHA1PRNG implements Testlet
{
private TestHarness harness = null;
boolean available = false;
public void test (TestHarness harness)
{
this.harness = harness;
this.harness.checkPoint ("SHA1PRNG");
instanceTest ();
setSeeedTest ();
}
// .../docs/guide/security/HowToImplAProvider.html lists SHA1PRNG as a MUST
private void instanceTest ()
{
available = (getInstance () != null);
harness.check (available, "found implementation");
}
// SecureRandom javadoc states:
//
// The SecureRandom implementation attempts to completely randomize the
// internal state of the generator itself unless the caller follows the call
// to a getInstance method with a call to the setSeed method:
//
// SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
// random.setSeed(seed);
//
// After the caller obtains the SecureRandom object from the getInstance call,
// it can call nextBytes to generate random bytes:
private void setSeeedTest ()
{
if (!available)
harness.fail ("no implementation found");
else
{
long a, b;
SecureRandom prng1 = getInstance ();
prng1.setSeed (98243647L);
SecureRandom prng2 = getInstance ();
prng2.setSeed (98243647L);
a = prng1.nextLong();
b = prng2.nextLong();
harness.check (a == b,
"instances generate same bytes when similarly seeded");
// if true in the beginning, it should be so forever
for (int i = 0; i < 1000; i++)
{
prng1.nextLong();
prng2.nextLong();
}
a = prng1.nextLong();
b = prng2.nextLong();
harness.check (a == b);
}
}
private SecureRandom getInstance ()
{
SecureRandom result = null;
try
{
result = SecureRandom.getInstance ("SHA1PRNG");
// result = SecureRandom.getInstance ("SHA1PRNG", "GNU");
}
// catch (NoSuchProviderException x)
// {
// harness.debug (x);
// }
catch (NoSuchAlgorithmException x)
{
harness.debug (x);
}
return result;
}
}
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