| /* |
| * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.crypto.spec; |
| |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| /** |
| * This class specifies an <i>initialization vector</i> (IV). |
| * Examples which use IVs are ciphers in feedback mode, |
| * e.g., DES in CBC mode and RSA ciphers with OAEP encoding |
| * operation. |
| * |
| * @author Jan Luehe |
| * |
| * @since 1.4 |
| */ |
| public class IvParameterSpec implements AlgorithmParameterSpec { |
| |
| private byte[] iv; |
| |
| /** |
| * Creates an IvParameterSpec object using the bytes in <code>iv</code> |
| * as the IV. |
| * |
| * @param iv the buffer with the IV. The contents of the |
| * buffer are copied to protect against subsequent modification. |
| * @throws NullPointerException if <code>iv</code> is <code>null</code> |
| */ |
| public IvParameterSpec(byte[] iv) { |
| this(iv, 0, iv.length); |
| } |
| |
| /** |
| * Creates an IvParameterSpec object using the first <code>len</code> |
| * bytes in <code>iv</code>, beginning at <code>offset</code> |
| * inclusive, as the IV. |
| * |
| * <p> The bytes that constitute the IV are those between |
| * <code>iv[offset]</code> and <code>iv[offset+len-1]</code> inclusive. |
| * |
| * @param iv the buffer with the IV. The first <code>len</code> |
| * bytes of the buffer beginning at <code>offset</code> inclusive |
| * are copied to protect against subsequent modification. |
| * @param offset the offset in <code>iv</code> where the IV |
| * starts. |
| * @param len the number of IV bytes. |
| * @throws IllegalArgumentException if <code>iv</code> is <code>null</code> |
| * or {@code (iv.length - offset < len)} |
| * @throws ArrayIndexOutOfBoundsException is thrown if <code>offset</code> |
| * or <code>len</code> index bytes outside the <code>iv</code>. |
| */ |
| public IvParameterSpec(byte[] iv, int offset, int len) { |
| if (iv == null) { |
| throw new IllegalArgumentException("IV missing"); |
| } |
| if (iv.length - offset < len) { |
| throw new IllegalArgumentException |
| ("IV buffer too short for given offset/length combination"); |
| } |
| if (len < 0) { |
| throw new ArrayIndexOutOfBoundsException("len is negative"); |
| } |
| this.iv = new byte[len]; |
| System.arraycopy(iv, offset, this.iv, 0, len); |
| } |
| |
| /** |
| * Returns the initialization vector (IV). |
| * |
| * @return the initialization vector (IV). Returns a new array |
| * each time this method is called. |
| */ |
| public byte[] getIV() { |
| return this.iv.clone(); |
| } |
| } |