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| 1 | /* | ||
| 2 | * Copyright (c) 2002, 2009, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package com.sun.crypto.provider; | ||
| 27 | |||
| 28 | import java.security.SecureRandom; | ||
| 29 | import java.security.InvalidParameterException; | ||
| 30 | import java.security.InvalidAlgorithmParameterException; | ||
| 31 | import java.security.InvalidKeyException; | ||
| 32 | import java.security.spec.AlgorithmParameterSpec; | ||
| 33 | import javax.crypto.KeyGeneratorSpi; | ||
| 34 | import javax.crypto.SecretKey; | ||
| 35 | import javax.crypto.spec.SecretKeySpec; | ||
| 36 | |||
| 37 | |||
| 38 | /** | ||
| 39 | * This class generates a AES key. | ||
| 40 | * | ||
| 41 | * @author Valerie Peng | ||
| 42 | * | ||
| 43 | */ | ||
| 44 | |||
| 45 | public final class AESKeyGenerator extends KeyGeneratorSpi { | ||
| 46 | |||
| 47 | private SecureRandom random = null; | ||
| 48 | private int keySize = 16; // default keysize (in number of bytes) | ||
| 49 | |||
| 50 | /** | ||
| 51 | * Empty constructor. | ||
| 52 | */ | ||
| 53 | public AESKeyGenerator() { | ||
| 54 | } | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Initializes this key generator. | ||
| 58 | * | ||
| 59 | * @param random the source of randomness for this generator | ||
| 60 | */ | ||
| 61 | protected void engineInit(SecureRandom random) { | ||
| 62 | this.random = random; | ||
| 63 | } | ||
| 64 | |||
| 65 | /** | ||
| 66 | * Initializes this key generator with the specified parameter | ||
| 67 | * set and a user-provided source of randomness. | ||
| 68 | * | ||
| 69 | * @param params the key generation parameters | ||
| 70 | * @param random the source of randomness for this key generator | ||
| 71 | * | ||
| 72 | * @exception InvalidAlgorithmParameterException if <code>params</code> is | ||
| 73 | * inappropriate for this key generator | ||
| 74 | */ | ||
| 75 | protected void engineInit(AlgorithmParameterSpec params, | ||
| 76 | SecureRandom random) | ||
| 77 | throws InvalidAlgorithmParameterException { | ||
| 78 | throw new InvalidAlgorithmParameterException | ||
| 79 | ("AES key generation does not take any parameters"); | ||
| 80 | } | ||
| 81 | |||
| 82 | /** | ||
| 83 | * Initializes this key generator for a certain keysize, using the given | ||
| 84 | * source of randomness. | ||
| 85 | * | ||
| 86 | * @param keysize the keysize. This is an algorithm-specific | ||
| 87 | * metric specified in number of bits. | ||
| 88 | * @param random the source of randomness for this key generator | ||
| 89 | */ | ||
| 90 | protected void engineInit(int keysize, SecureRandom random) { | ||
| 91 | if (((keysize % 8) != 0) || | ||
| 92 | (!AESCrypt.isKeySizeValid(keysize/8))) { | ||
| 93 | throw new InvalidParameterException | ||
| 94 | ("Wrong keysize: must be equal to 128, 192 or 256"); | ||
| 95 | } | ||
| 96 | this.keySize = keysize/8; | ||
| 97 | this.engineInit(random); | ||
| 98 | } | ||
| 99 | |||
| 100 | /** | ||
| 101 | * Generates the AES key. | ||
| 102 | * | ||
| 103 | * @return the new AES key | ||
| 104 | */ | ||
| 105 | protected SecretKey engineGenerateKey() { | ||
| 106 | SecretKeySpec aesKey = null; | ||
| 107 | |||
| 108 | if (this.random == null) { | ||
| 109 | this.random = SunJCE.RANDOM; | ||
| 110 | } | ||
| 111 | |||
| 112 | byte[] keyBytes = new byte[keySize]; | ||
| 113 | this.random.nextBytes(keyBytes); | ||
| 114 | aesKey = new SecretKeySpec(keyBytes, "AES"); | ||
| 115 | return aesKey; | ||
| 116 | } | ||
| 117 | } | ||