118 lines
3.8 KiB
Java
118 lines
3.8 KiB
Java
/*
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* Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.crypto.provider;
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import java.security.SecureRandom;
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import java.security.InvalidParameterException;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.spec.AlgorithmParameterSpec;
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import javax.crypto.KeyGeneratorSpi;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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/**
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* This class generates a AES key.
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*
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* @author Valerie Peng
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*
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*/
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public final class AESKeyGenerator extends KeyGeneratorSpi {
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private SecureRandom random = null;
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private int keySize = 16; // default keysize (in number of bytes)
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/**
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* Empty constructor.
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*/
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public AESKeyGenerator() {
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}
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/**
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* Initializes this key generator.
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*
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* @param random the source of randomness for this generator
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*/
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protected void engineInit(SecureRandom random) {
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this.random = random;
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}
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/**
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* Initializes this key generator with the specified parameter
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* set and a user-provided source of randomness.
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*
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* @param params the key generation parameters
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* @param random the source of randomness for this key generator
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*
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* @exception InvalidAlgorithmParameterException if <code>params</code> is
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* inappropriate for this key generator
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*/
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protected void engineInit(AlgorithmParameterSpec params,
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SecureRandom random)
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throws InvalidAlgorithmParameterException {
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throw new InvalidAlgorithmParameterException
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("AES key generation does not take any parameters");
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}
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/**
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* Initializes this key generator for a certain keysize, using the given
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* source of randomness.
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*
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* @param keysize the keysize. This is an algorithm-specific
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* metric specified in number of bits.
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* @param random the source of randomness for this key generator
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*/
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protected void engineInit(int keysize, SecureRandom random) {
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if (((keysize % 8) != 0) ||
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(!AESCrypt.isKeySizeValid(keysize/8))) {
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throw new InvalidParameterException
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("Wrong keysize: must be equal to 128, 192 or 256");
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}
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this.keySize = keysize/8;
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this.engineInit(random);
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}
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/**
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* Generates the AES key.
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*
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* @return the new AES key
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*/
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protected SecretKey engineGenerateKey() {
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SecretKeySpec aesKey = null;
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if (this.random == null) {
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this.random = SunJCE.getRandom();
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}
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byte[] keyBytes = new byte[keySize];
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this.random.nextBytes(keyBytes);
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aesKey = new SecretKeySpec(keyBytes, "AES");
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return aesKey;
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}
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}
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