mirror of git://gcc.gnu.org/git/gcc.git
101 lines
2.9 KiB
Java
101 lines
2.9 KiB
Java
/* FortunaImpl.java -- Fortuna SecureRandom adapter.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.crypto.jce.prng;
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import gnu.java.security.prng.LimitReachedException;
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import gnu.java.security.jce.prng.SecureRandomAdapter;
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import gnu.javax.crypto.prng.Fortuna;
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import java.security.SecureRandomSpi;
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import java.util.Collections;
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public final class FortunaImpl
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extends SecureRandomSpi
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{
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private boolean virgin = true;
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private final Fortuna adaptee;
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public FortunaImpl()
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{
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adaptee = new Fortuna();
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}
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protected void engineSetSeed(byte[] seed)
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{
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synchronized (adaptee)
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{
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if (virgin)
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{
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adaptee.init (Collections.singletonMap (Fortuna.SEED, seed));
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virgin = false;
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}
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else
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{
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adaptee.addRandomBytes (seed);
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}
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}
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}
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protected void engineNextBytes(byte[] buffer)
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{
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synchronized (adaptee)
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{
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if (virgin)
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{
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this.engineSetSeed(engineGenerateSeed(32));
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}
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try
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{
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adaptee.nextBytes(buffer);
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}
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catch (LimitReachedException shouldNotHappen)
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{
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throw new Error(shouldNotHappen);
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}
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}
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}
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protected byte[] engineGenerateSeed(int numBytes)
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{
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return SecureRandomAdapter.getSeed(numBytes);
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}
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}
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