| /* |
| * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * 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. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import java.security.SecureRandom; |
| import java.security.InvalidParameterException; |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.spec.AlgorithmParameterSpec; |
| import javax.crypto.KeyGeneratorSpi; |
| import javax.crypto.SecretKey; |
| import javax.crypto.spec.SecretKeySpec; |
| |
| /** |
| * This class generates a secret key for use with the Blowfish algorithm. |
| * |
| * @author Jan Luehe |
| * |
| */ |
| |
| public final class BlowfishKeyGenerator extends KeyGeneratorSpi { |
| |
| private SecureRandom random = null; |
| private int keysize = 16; // default keysize (in number of bytes) |
| |
| /** |
| * Empty constructor |
| */ |
| public BlowfishKeyGenerator() { |
| } |
| |
| /** |
| * Initializes this key generator. |
| * |
| * @param random the source of randomness for this generator |
| */ |
| protected void engineInit(SecureRandom random) { |
| this.random = random; |
| } |
| |
| /** |
| * Initializes this key generator with the specified parameter |
| * set and a user-provided source of randomness. |
| * |
| * @param params the key generation parameters |
| * @param random the source of randomness for this key generator |
| * |
| * @exception InvalidAlgorithmParameterException if <code>params</code> is |
| * inappropriate for this key generator |
| */ |
| protected void engineInit(AlgorithmParameterSpec params, |
| SecureRandom random) |
| throws InvalidAlgorithmParameterException |
| { |
| throw new InvalidAlgorithmParameterException |
| ("Blowfish key generation does not take any parameters"); |
| } |
| |
| /** |
| * Initializes this key generator for a certain keysize, using the given |
| * source of randomness. |
| * |
| * @param keysize the keysize. This is an algorithm-specific |
| * metric specified in number of bits. |
| * @param random the source of randomness for this key generator |
| */ |
| protected void engineInit(int keysize, SecureRandom random) { |
| if (((keysize % 8) != 0) || (keysize < 32) || (keysize > 448)) { |
| throw new InvalidParameterException("Keysize must be " |
| + "multiple of 8, and can " |
| + "only range from 32 to 448 " |
| + "(inclusive)"); |
| } |
| this.keysize = keysize / 8; |
| this.engineInit(random); |
| } |
| |
| /** |
| * Generates a Blowfish key. |
| * |
| * @return the new Blowfish key |
| */ |
| protected SecretKey engineGenerateKey() { |
| if (this.random == null) { |
| this.random = SunJCE.getRandom(); |
| } |
| |
| byte[] keyBytes = new byte[this.keysize]; |
| this.random.nextBytes(keyBytes); |
| |
| return new SecretKeySpec(keyBytes, "Blowfish"); |
| } |
| } |