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jlechner |
/* DiffieHellmanKeyFactoryImpl.java --
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is 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, or (at your option)
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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; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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.java.security.provider;
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import gnu.javax.crypto.GnuDHPrivateKey;
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import java.security.InvalidKeyException;
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import java.security.Key;
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import java.security.KeyFactorySpi;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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import javax.crypto.spec.DHParameterSpec;
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import javax.crypto.spec.DHPrivateKeySpec;
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import javax.crypto.spec.DHPublicKeySpec;
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import javax.crypto.interfaces.DHPrivateKey;
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import javax.crypto.interfaces.DHPublicKey;
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public class DiffieHellmanKeyFactoryImpl extends KeyFactorySpi
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{
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protected PrivateKey engineGeneratePrivate (final KeySpec spec)
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throws InvalidKeySpecException
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{
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if (spec instanceof DHPrivateKeySpec)
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{
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DHPrivateKeySpec dh = (DHPrivateKeySpec) spec;
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return new GnuDHPrivateKey (dh.getX (),
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new DHParameterSpec (dh.getP (), dh.getG ()));
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}
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throw new InvalidKeySpecException ();
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}
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protected PublicKey engineGeneratePublic (final KeySpec spec)
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throws InvalidKeySpecException
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{
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if (spec instanceof DHPublicKeySpec)
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{
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DHPublicKeySpec dh = (DHPublicKeySpec) spec;
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return new GnuDHPublicKey (new DHParameterSpec (dh.getP (), dh.getG ()),
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dh.getY(), null);
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}
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throw new InvalidKeySpecException ();
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}
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protected KeySpec engineGetKeySpec (final Key key, final Class specClass)
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throws InvalidKeySpecException
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{
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if (key instanceof DHPrivateKey)
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{
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if (DHPrivateKeySpec.class.isAssignableFrom (specClass))
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{
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DHParameterSpec params = ((DHPrivateKey) key).getParams ();
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return new DHPrivateKeySpec (((DHPrivateKey) key).getX (),
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params.getP (), params.getG ());
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}
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}
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if (key instanceof DHPublicKey)
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{
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if (DHPublicKeySpec.class.isAssignableFrom (specClass))
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{
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DHParameterSpec params = ((DHPublicKey) key).getParams ();
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return new DHPublicKeySpec (((DHPublicKey) key).getY (),
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params.getP (), params.getG ());
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}
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}
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throw new InvalidKeySpecException ();
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}
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protected Key engineTranslateKey (final Key key)
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throws InvalidKeyException
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{
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if (key instanceof DHPrivateKey)
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{
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return new GnuDHPrivateKey (((DHPrivateKey) key).getX (),
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((DHPrivateKey) key).getParams ());
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}
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if (key instanceof DHPublicKey)
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{
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return new GnuDHPublicKey (((DHPublicKey) key).getParams (),
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((DHPublicKey) key).getY (), null);
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}
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throw new InvalidKeyException ();
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}
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}
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