1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 /** 18 * @author Alexander Y. Kleymenov 19 * @version $Revision$ 20 */ 21 22 package javax.crypto.spec; 23 24 import java.security.spec.AlgorithmParameterSpec; 25 import java.util.Arrays; 26 27 /** 28 * The algorithm parameter specification for an <i>initialization vector</i>. 29 */ 30 public class IvParameterSpec implements AlgorithmParameterSpec { 31 32 private final byte[] iv; 33 34 /** 35 * Creates a new <code>IvParameterSpec</code> instance with the bytes from 36 * the specified buffer <i>iv</i> used as <i>initialization vector</i>. 37 * 38 * @param iv 39 * the buffer used as initialization vector. 40 * @throws NullPointerException 41 * if the specified buffer is null. 42 */ 43 public IvParameterSpec(byte[] iv) { 44 if (iv == null) { 45 throw new NullPointerException("iv == null"); 46 } 47 this.iv = new byte[iv.length]; 48 System.arraycopy(iv, 0, this.iv, 0, iv.length); 49 } 50 51 /** 52 * Creates a new <code>IvParameterSpec</code> instance with <code>byteCount</code> 53 * bytes from the specified buffer <code>iv</code> starting at 54 * <code>offset</code>. 55 * 56 * @throws IllegalArgumentException 57 * if the specified buffer is null or <code>offset</code> and 58 * <code>byteCount</code> do not specify a valid chunk in the 59 * specified buffer. 60 * @throws ArrayIndexOutOfBoundsException 61 * if <code>offset</code> or <code>byteCount</code> are negative. 62 */ 63 public IvParameterSpec(byte[] iv, int offset, int byteCount) { 64 if ((iv == null) || (iv.length - offset < byteCount)) { 65 throw new IllegalArgumentException(); 66 } 67 Arrays.checkOffsetAndCount(iv.length, offset, byteCount); 68 this.iv = new byte[byteCount]; 69 System.arraycopy(iv, offset, this.iv, 0, byteCount); 70 } 71 72 /** 73 * Returns a copy of the <i>initialization vector</i> data. 74 * 75 * @return a copy of the initialization vector data. 76 */ 77 public byte[] getIV() { 78 byte[] res = new byte[iv.length]; 79 System.arraycopy(iv, 0, res, 0, iv.length); 80 return res; 81 } 82 } 83
