/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* This class implements the Diffie-Hellman key factory of the Sun provider.
*
* @author Jan Luehe
*
*/
/**
* Empty constructor
*/
public DHKeyFactory() {
}
/**
* Generates a public key object from the provided key specification
* (key material).
*
* @param keySpec the specification (key material) of the public key
*
* @return the public key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this key factory to produce a public key.
*/
throws InvalidKeySpecException
{
try {
if (keySpec instanceof DHPublicKeySpec) {
dhPubKeySpec.getP(),
dhPubKeySpec.getG());
} else if (keySpec instanceof X509EncodedKeySpec) {
return new DHPublicKey
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
}
/**
* Generates a private key object from the provided key specification
* (key material).
*
* @param keySpec the specification (key material) of the private key
*
* @return the private key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this key factory to produce a private key.
*/
throws InvalidKeySpecException
{
try {
if (keySpec instanceof DHPrivateKeySpec) {
dhPrivKeySpec.getG());
} else if (keySpec instanceof PKCS8EncodedKeySpec) {
return new DHPrivateKey
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
}
/**
* Returns a specification (key material) of the given key object
* in the requested format.
*
* @param key the key
*
* @param keySpec the requested format in which the key material shall be
* returned
*
* @return the underlying key specification (key material) in the
* requested format
*
* @exception InvalidKeySpecException if the requested key specification is
* inappropriate for the given key, or the given key cannot be processed
* (e.g., the given key has an unrecognized algorithm or format).
*/
throws InvalidKeySpecException {
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} else {
throw new InvalidKeySpecException("Inappropriate key type");
}
}
/**
* Translates a key object, whose provider may be unknown or potentially
* untrusted, into a corresponding key object of this key factory.
*
* @param key the key whose provider is unknown or untrusted
*
* @return the translated key
*
* @exception InvalidKeyException if the given key cannot be processed by
* this key factory.
*/
throws InvalidKeyException
{
try {
// Check if key originates from this factory
return key;
}
// Convert key to spec
(key, DHPublicKeySpec.class);
// Create key from spec, and return it
return engineGeneratePublic(dhPubKeySpec);
// Check if key originates from this factory
return key;
}
// Convert key to spec
(key, DHPrivateKeySpec.class);
// Create key from spec, and return it
return engineGeneratePrivate(dhPrivKeySpec);
} else {
throw new InvalidKeyException("Wrong algorithm type");
}
} catch (InvalidKeySpecException e) {
throw new InvalidKeyException("Cannot translate key");
}
}
}