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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 | +} | |