| /* SecretKeyGeneratorImpl.java -- symmetric key pair generator. |
| Copyright (C) 2004, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath 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 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath 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 GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.crypto.jce.key; |
| |
| import gnu.javax.crypto.cipher.CipherFactory; |
| import gnu.javax.crypto.cipher.IBlockCipher; |
| |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.InvalidParameterException; |
| import java.security.SecureRandom; |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import javax.crypto.KeyGeneratorSpi; |
| import javax.crypto.SecretKey; |
| import javax.crypto.spec.SecretKeySpec; |
| |
| public class SecretKeyGeneratorImpl |
| extends KeyGeneratorSpi |
| { |
| protected final int defaultKeySize; |
| protected final List keySizes; |
| protected final String algorithm; |
| protected boolean init; |
| protected int currentKeySize; |
| protected SecureRandom random; |
| |
| protected SecretKeyGeneratorImpl(final String algorithm) |
| { |
| this.algorithm = algorithm; |
| IBlockCipher cipher = CipherFactory.getInstance(algorithm); |
| if (cipher == null) |
| throw new IllegalArgumentException("no such cipher: " + algorithm); |
| defaultKeySize = cipher.defaultKeySize(); |
| keySizes = new LinkedList(); |
| for (Iterator it = cipher.keySizes(); it.hasNext();) |
| keySizes.add(it.next()); |
| init = false; |
| } |
| |
| protected SecretKey engineGenerateKey() |
| { |
| if (! init) |
| throw new IllegalStateException("not initialized"); |
| byte[] buf = new byte[currentKeySize]; |
| random.nextBytes(buf); |
| return new SecretKeySpec(buf, algorithm); |
| } |
| |
| protected void engineInit(AlgorithmParameterSpec params, SecureRandom random) |
| throws InvalidAlgorithmParameterException |
| { |
| throw new InvalidAlgorithmParameterException( |
| algorithm + " does not support algorithm paramaters"); |
| } |
| |
| protected void engineInit(int keySize, SecureRandom random) |
| { |
| keySize >>>= 3; // Use bytes. |
| if (! keySizes.contains(Integer.valueOf(keySize))) |
| throw new InvalidParameterException("unsupported key size: " + keySize); |
| currentKeySize = keySize; |
| this.random = random; |
| init = true; |
| } |
| |
| protected void engineInit(SecureRandom random) |
| { |
| engineInit(defaultKeySize << 3, random); |
| } |
| } |