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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2007, 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.KeyRep; | ||
| 29 | import java.security.InvalidKeyException; | ||
| 30 | import javax.crypto.SecretKey; | ||
| 31 | import javax.crypto.spec.DESKeySpec; | ||
| 32 | |||
| 33 | /** | ||
| 34 | * This class represents a DES key. | ||
| 35 | * | ||
| 36 | * @author Jan Luehe | ||
| 37 | * | ||
| 38 | */ | ||
| 39 | |||
| 40 | final class DESKey implements SecretKey { | ||
| 41 | |||
| 42 | static final long serialVersionUID = 7724971015953279128L; | ||
| 43 | |||
| 44 | private byte[] key; | ||
| 45 | |||
| 46 | /** | ||
| 47 | * Uses the first 8 bytes of the given key as the DES key. | ||
| 48 | * | ||
| 49 | * @param key the buffer with the DES key bytes. | ||
| 50 | * | ||
| 51 | * @exception InvalidKeyException if less than 8 bytes are available for | ||
| 52 | * the key. | ||
| 53 | */ | ||
| 54 | DESKey(byte[] key) throws InvalidKeyException { | ||
| 55 | this(key, 0); | ||
| 56 | } | ||
| 57 | |||
| 58 | /** | ||
| 59 | * Uses the first 8 bytes in <code>key</code>, beginning at | ||
| 60 | * <code>offset</code>, as the DES key | ||
| 61 | * | ||
| 62 | * @param key the buffer with the DES key bytes. | ||
| 63 | * @param offset the offset in <code>key</code>, where the DES key bytes | ||
| 64 | * start. | ||
| 65 | * | ||
| 66 | * @exception InvalidKeyException if less than 8 bytes are available for | ||
| 67 | * the key. | ||
| 68 | */ | ||
| 69 | DESKey(byte[] key, int offset) throws InvalidKeyException { | ||
| 70 | if (key == null || key.length - offset < DESKeySpec.DES_KEY_LEN) { | ||
| 71 | throw new InvalidKeyException("Wrong key size"); | ||
| 72 | } | ||
| 73 | this.key = new byte[DESKeySpec.DES_KEY_LEN]; | ||
| 74 | System.arraycopy(key, offset, this.key, 0, DESKeySpec.DES_KEY_LEN); | ||
| 75 | DESKeyGenerator.setParityBit(this.key, 0); | ||
| 76 | } | ||
| 77 | |||
| 78 | public byte[] getEncoded() { | ||
| 79 | // Return a copy of the key, rather than a reference, | ||
| 80 | // so that the key data cannot be modified from outside | ||
| 81 | return (byte[])this.key.clone(); | ||
| 82 | } | ||
| 83 | |||
| 84 | public String getAlgorithm() { | ||
| 85 | return "DES"; | ||
| 86 | } | ||
| 87 | |||
| 88 | public String getFormat() { | ||
| 89 | return "RAW"; | ||
| 90 | } | ||
| 91 | |||
| 92 | /** | ||
| 93 | * Calculates a hash code value for the object. | ||
| 94 | * Objects that are equal will also have the same hashcode. | ||
| 95 | */ | ||
| 96 | public int hashCode() { | ||
| 97 | int retval = 0; | ||
| 98 | for (int i = 1; i < this.key.length; i++) { | ||
| 99 | retval += this.key[i] * i; | ||
| 100 | } | ||
| 101 | return(retval ^= "des".hashCode()); | ||
| 102 | } | ||
| 103 | |||
| 104 | public boolean equals(Object obj) { | ||
| 105 | if (this == obj) | ||
| 106 | return true; | ||
| 107 | |||
| 108 | if (!(obj instanceof SecretKey)) | ||
| 109 | return false; | ||
| 110 | |||
| 111 | String thatAlg = ((SecretKey)obj).getAlgorithm(); | ||
| 112 | if (!(thatAlg.equalsIgnoreCase("DES"))) | ||
| 113 | return false; | ||
| 114 | |||
| 115 | byte[] thatKey = ((SecretKey)obj).getEncoded(); | ||
| 116 | boolean ret = java.util.Arrays.equals(this.key, thatKey); | ||
| 117 | java.util.Arrays.fill(thatKey, (byte)0x00); | ||
| 118 | return ret; | ||
| 119 | } | ||
| 120 | |||
| 121 | /** | ||
| 122 | * readObject is called to restore the state of this key from | ||
| 123 | * a stream. | ||
| 124 | */ | ||
| 125 | private void readObject(java.io.ObjectInputStream s) | ||
| 126 | throws java.io.IOException, ClassNotFoundException | ||
| 127 | { | ||
| 128 | s.defaultReadObject(); | ||
| 129 | key = (byte[])key.clone(); | ||
| 130 | } | ||
| 131 | |||
| 132 | /** | ||
| 133 | * Replace the DES key to be serialized. | ||
| 134 | * | ||
| 135 | * @return the standard KeyRep object to be serialized | ||
| 136 | * | ||
| 137 | * @throws java.io.ObjectStreamException if a new object representing | ||
| 138 | * this DES key could not be created | ||
| 139 | */ | ||
| 140 | private Object writeReplace() throws java.io.ObjectStreamException { | ||
| 141 | return new KeyRep(KeyRep.Type.SECRET, | ||
| 142 | getAlgorithm(), | ||
| 143 | getFormat(), | ||
| 144 | getEncoded()); | ||
| 145 | } | ||
| 146 | |||
| 147 | /** | ||
| 148 | * Ensures that the bytes of this key are | ||
| 149 | * set to zero when there are no more references to it. | ||
| 150 | */ | ||
| 151 | protected void finalize() throws Throwable { | ||
| 152 | try { | ||
| 153 | if (this.key != null) { | ||
| 154 | java.util.Arrays.fill(this.key, (byte)0x00); | ||
| 155 | this.key = null; | ||
| 156 | } | ||
| 157 | } finally { | ||
| 158 | super.finalize(); | ||
| 159 | } | ||
| 160 | } | ||
| 161 | } | ||