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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 javax.crypto.spec; | ||
| 27 | |||
| 28 | import java.security.InvalidKeyException; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * This class specifies a DES-EDE ("triple-DES") key. | ||
| 32 | * | ||
| 33 | * @author Jan Luehe | ||
| 34 | * | ||
| 35 | * @since 1.4 | ||
| 36 | */ | ||
| 37 | public class DESedeKeySpec implements java.security.spec.KeySpec { | ||
| 38 | |||
| 39 | /** | ||
| 40 | * The constant which defines the length of a DESede key in bytes. | ||
| 41 | */ | ||
| 42 | public static final int DES_EDE_KEY_LEN = 24; | ||
| 43 | |||
| 44 | private byte[] key; | ||
| 45 | |||
| 46 | /** | ||
| 47 | * Creates a DESedeKeySpec object using the first 24 bytes in | ||
| 48 | * <code>key</code> as the key material for the DES-EDE key. | ||
| 49 | * | ||
| 50 | * <p> The bytes that constitute the DES-EDE key are those between | ||
| 51 | * <code>key[0]</code> and <code>key[23]</code> inclusive | ||
| 52 | * | ||
| 53 | * @param key the buffer with the DES-EDE key material. The first | ||
| 54 | * 24 bytes of the buffer are copied to protect against subsequent | ||
| 55 | * modification. | ||
| 56 | * | ||
| 57 | * @exception NullPointerException if <code>key</code> is null. | ||
| 58 | * @exception InvalidKeyException if the given key material is shorter | ||
| 59 | * than 24 bytes. | ||
| 60 | */ | ||
| 61 | public DESedeKeySpec(byte[] key) throws InvalidKeyException { | ||
| 62 | this(key, 0); | ||
| 63 | } | ||
| 64 | |||
| 65 | /** | ||
| 66 | * Creates a DESedeKeySpec object using the first 24 bytes in | ||
| 67 | * <code>key</code>, beginning at <code>offset</code> inclusive, | ||
| 68 | * as the key material for the DES-EDE key. | ||
| 69 | * | ||
| 70 | * <p> The bytes that constitute the DES-EDE key are those between | ||
| 71 | * <code>key[offset]</code> and <code>key[offset+23]</code> inclusive. | ||
| 72 | * | ||
| 73 | * @param key the buffer with the DES-EDE key material. The first | ||
| 74 | * 24 bytes of the buffer beginning at <code>offset</code> inclusive | ||
| 75 | * are copied to protect against subsequent modification. | ||
| 76 | * @param offset the offset in <code>key</code>, where the DES-EDE key | ||
| 77 | * material starts. | ||
| 78 | * | ||
| 79 | * @exception NullPointerException if <code>key</code> is null. | ||
| 80 | * @exception InvalidKeyException if the given key material, starting at | ||
| 81 | * <code>offset</code> inclusive, is shorter than 24 bytes | ||
| 82 | */ | ||
| 83 | public DESedeKeySpec(byte[] key, int offset) throws InvalidKeyException { | ||
| 84 | if (key.length - offset < 24) { | ||
| 85 | throw new InvalidKeyException("Wrong key size"); | ||
| 86 | } | ||
| 87 | this.key = new byte[24]; | ||
| 88 | System.arraycopy(key, offset, this.key, 0, 24); | ||
| 89 | } | ||
| 90 | |||
| 91 | /** | ||
| 92 | * Returns the DES-EDE key. | ||
| 93 | * | ||
| 94 | * @return the DES-EDE key. Returns a new array | ||
| 95 | * each time this method is called. | ||
| 96 | */ | ||
| 97 | public byte[] getKey() { | ||
| 98 | return (byte[])this.key.clone(); | ||
| 99 | } | ||
| 100 | |||
| 101 | /** | ||
| 102 | * Checks if the given DES-EDE key, starting at <code>offset</code> | ||
| 103 | * inclusive, is parity-adjusted. | ||
| 104 | * | ||
| 105 | * @param key a byte array which holds the key value | ||
| 106 | * @param offset the offset into the byte array | ||
| 107 | * @return true if the given DES-EDE key is parity-adjusted, false | ||
| 108 | * otherwise | ||
| 109 | * | ||
| 110 | * @exception NullPointerException if <code>key</code> is null. | ||
| 111 | * @exception InvalidKeyException if the given key material, starting at | ||
| 112 | * <code>offset</code> inclusive, is shorter than 24 bytes | ||
| 113 | */ | ||
| 114 | public static boolean isParityAdjusted(byte[] key, int offset) | ||
| 115 | throws InvalidKeyException { | ||
| 116 | if (key.length - offset < 24) { | ||
| 117 | throw new InvalidKeyException("Wrong key size"); | ||
| 118 | } | ||
| 119 | if (DESKeySpec.isParityAdjusted(key, offset) == false | ||
| 120 | || DESKeySpec.isParityAdjusted(key, offset + 8) == false | ||
| 121 | || DESKeySpec.isParityAdjusted(key, offset + 16) == false) { | ||
| 122 | return false; | ||
| 123 | } | ||
| 124 | return true; | ||
| 125 | } | ||
| 126 | } | ||