author | valeriep |
Tue, 08 May 2012 17:57:48 -0700 | |
changeset 12685 | 8a448b5b9006 |
parent 5506 | 202f599c92aa |
child 15010 | ec6b49ce42b1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2009, 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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ddbd63234844
6647452: Remove obfuscation, framework and provider self-verification checking
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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.RANDOM; |
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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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} |