1adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/* 2adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one or more 3adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * contributor license agreements. See the NOTICE file distributed with 4adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * this work for additional information regarding copyright ownership. 5adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The ASF licenses this file to You under the Apache License, Version 2.0 6adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * (the "License"); you may not use this file except in compliance with 7adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the License. You may obtain a copy of the License at 8adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 9adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 10adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 11adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Unless required by applicable law or agreed to in writing, software 12adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 13adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * See the License for the specific language governing permissions and 15adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * limitations under the License. 16adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 17adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 18adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpackage javax.crypto.spec; 19adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 20adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.security.InvalidKeyException; 21adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.security.spec.KeySpec; 22adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 23adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/** 24adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The key specification for a triple-DES (DES-EDE) key. 25adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 26adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpublic class DESedeKeySpec implements KeySpec { 27adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 28adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 29adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The length of a DES-EDE key in bytes. 30adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 31adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public static final int DES_EDE_KEY_LEN = 24; 32adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 33adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project private final byte[] key; 34adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 35adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 36adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Creates a new <code>DESedeKeySpec</code> instance from the first 24 ( 37adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link #DES_EDE_KEY_LEN}) bytes of the specified key data. 38ce9ec01c0b6da3f3ba01e9c81cc3e5a461aabfb6Jesse Wilson * 39adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param key 40adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the key data. 41adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws InvalidKeyException 42adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the length of the key data is less than 24. 43adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws NullPointerException 44adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the key data is null. 45adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 4680a7fbab52b96c9fd47c72f8987d1babe2cd001dElliott Hughes public DESedeKeySpec(byte[] key) throws InvalidKeyException { 47adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (key == null) { 4886acc043d3334651ee26c65467d78d6cefedd397Kenny Root throw new NullPointerException("key == null"); 49adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 50adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (key.length < DES_EDE_KEY_LEN) { 5180a7fbab52b96c9fd47c72f8987d1babe2cd001dElliott Hughes throw new InvalidKeyException(); 52adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 53adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this.key = new byte[DES_EDE_KEY_LEN]; 54adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project System.arraycopy(key, 0, this.key, 0, DES_EDE_KEY_LEN); 55adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 56adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 57adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 58adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Creates a new <code>DESedeKeySpec</code> instance from the first 24 ( 59adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link #DES_EDE_KEY_LEN} ) bytes of the specified key data starting at 60adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * <code>offset</code>. 61ce9ec01c0b6da3f3ba01e9c81cc3e5a461aabfb6Jesse Wilson * 62adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param key 63adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the key data 64adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param offset 65adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the offset to start at. 66adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws InvalidKeyException 67adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the length of the key data starting at offset is less than 68adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 24. 69adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws NullPointerException 70adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the key data is null. 71adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 7280a7fbab52b96c9fd47c72f8987d1babe2cd001dElliott Hughes public DESedeKeySpec(byte[] key, int offset) throws InvalidKeyException { 73adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (key == null) { 7486acc043d3334651ee26c65467d78d6cefedd397Kenny Root throw new NullPointerException("key == null"); 75adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 76adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (key.length - offset < DES_EDE_KEY_LEN) { 7780a7fbab52b96c9fd47c72f8987d1babe2cd001dElliott Hughes throw new InvalidKeyException(); 78adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 79adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this.key = new byte[DES_EDE_KEY_LEN]; 80adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project System.arraycopy(key, offset, this.key, 0, DES_EDE_KEY_LEN); 81adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 82adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 83adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 84adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns a copy of the key. 85ce9ec01c0b6da3f3ba01e9c81cc3e5a461aabfb6Jesse Wilson * 86adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return a copy of the key. 87adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 88adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public byte[] getKey() { 89adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project byte[] result = new byte [DES_EDE_KEY_LEN]; 90adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project System.arraycopy(this.key, 0, result, 0, DES_EDE_KEY_LEN); 91adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return result; 92adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 93adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 94adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 95adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns whether the specified key data starting at <code>offset</code> is 96adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * <i>parity-adjusted</i>. 97ce9ec01c0b6da3f3ba01e9c81cc3e5a461aabfb6Jesse Wilson * 98adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param key 99adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the key data. 100adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param offset 101adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the offset to start checking at. 102adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return {@code true} if the specified key data is parity-adjusted, 103adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@code false} otherwise. 104adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws InvalidKeyException 105adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the length of the key data starting at offset is less than 106adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 24. 107adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 10880a7fbab52b96c9fd47c72f8987d1babe2cd001dElliott Hughes public static boolean isParityAdjusted(byte[] key, int offset) throws InvalidKeyException { 109adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (key.length - offset < DES_EDE_KEY_LEN) { 11080a7fbab52b96c9fd47c72f8987d1babe2cd001dElliott Hughes throw new InvalidKeyException(); 111adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 112adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project for (int i=offset; i<DES_EDE_KEY_LEN+offset; i++) { 113adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project int b = key[i]; 114adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if ((((b & 1) + ((b & 2) >> 1) + ((b & 4) >> 2) 115adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project + ((b & 8) >> 3) + ((b & 16) >> 4) + ((b & 32) >> 5) 116adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project + ((b & 64) >> 6)) & 1) == ((b & 128) >> 7)) { 117adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return false; 118adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 119adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 120adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return true; 121adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 122adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project} 123