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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 | +} | |