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) 1997, 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 javax.crypto.KeyGeneratorSpi; |
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import javax.crypto.SecretKey; |
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import javax.crypto.spec.DESedeKeySpec; |
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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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/** |
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* This class generates a Triple DES key. |
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* |
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* @author Jan Luehe |
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* |
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*/ |
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public final class DESedeKeyGenerator extends KeyGeneratorSpi { |
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private SecureRandom random = null; |
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private int keysize = 168; |
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/** |
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6647452: Remove obfuscation, framework and provider self-verification checking
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* Empty constructor |
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*/ |
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public DESedeKeyGenerator() { |
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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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("Triple DES 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. A keysize with 112 bits of entropy |
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* corresponds to a Triple DES key with 2 intermediate keys, and a keysize |
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* with 168 bits of entropy corresponds to a Triple DES key with 3 |
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* intermediate keys. |
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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 != 112) && (keysize != 168)) { |
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throw new InvalidParameterException("Wrong keysize: must be " |
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+ "equal to 112 or 168"); |
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} |
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this.keysize = keysize; |
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this.engineInit(random); |
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} |
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/** |
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* Generates the Triple DES key. |
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* |
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* @return the new Triple DES key |
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*/ |
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protected SecretKey engineGenerateKey() { |
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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[] rawkey = new byte[DESedeKeySpec.DES_EDE_KEY_LEN]; |
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if (keysize == 168) { |
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// 3 intermediate keys |
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this.random.nextBytes(rawkey); |
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// Do parity adjustment for each intermediate key |
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DESKeyGenerator.setParityBit(rawkey, 0); |
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DESKeyGenerator.setParityBit(rawkey, 8); |
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DESKeyGenerator.setParityBit(rawkey, 16); |
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} else { |
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// 2 intermediate keys |
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byte[] tmpkey = new byte[16]; |
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this.random.nextBytes(tmpkey); |
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DESKeyGenerator.setParityBit(tmpkey, 0); |
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DESKeyGenerator.setParityBit(tmpkey, 8); |
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System.arraycopy(tmpkey, 0, rawkey, 0, tmpkey.length); |
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// Copy the first 8 bytes into the last |
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System.arraycopy(tmpkey, 0, rawkey, 16, 8); |
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java.util.Arrays.fill(tmpkey, (byte)0x00); |
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} |
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DESedeKey desEdeKey = null; |
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try { |
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desEdeKey = new DESedeKey(rawkey); |
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} catch (InvalidKeyException ike) { |
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// this never happens |
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throw new RuntimeException(ike.getMessage()); |
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} |
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java.util.Arrays.fill(rawkey, (byte)0x00); |
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return desEdeKey; |
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} |
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} |