author | alanb |
Mon, 10 Jun 2013 12:58:32 +0100 | |
changeset 18156 | edb590d448c5 |
parent 10336 | 0bb1999251f8 |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.crypto.spec; |
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import java.security.spec.AlgorithmParameterSpec; |
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/** |
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* This class specifies an <i>initialization vector</i> (IV). |
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* Examples which use IVs are ciphers in feedback mode, |
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* e.g., DES in CBC mode and RSA ciphers with OAEP encoding |
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* operation. |
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* |
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* @author Jan Luehe |
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* |
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* @since 1.4 |
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*/ |
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public class IvParameterSpec implements AlgorithmParameterSpec { |
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private byte[] iv; |
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/** |
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* Creates an IvParameterSpec object using the bytes in <code>iv</code> |
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* as the IV. |
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* |
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* @param iv the buffer with the IV. The contents of the |
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* buffer are copied to protect against subsequent modification. |
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* @throws NullPointerException if <code>iv</code> is <code>null</code> |
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*/ |
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public IvParameterSpec(byte[] iv) { |
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this(iv, 0, iv.length); |
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} |
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/** |
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* Creates an IvParameterSpec object using the first <code>len</code> |
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* bytes in <code>iv</code>, beginning at <code>offset</code> |
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* inclusive, as the IV. |
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* |
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* <p> The bytes that constitute the IV are those between |
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* <code>iv[offset]</code> and <code>iv[offset+len-1]</code> inclusive. |
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* |
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* @param iv the buffer with the IV. The first <code>len</code> |
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* bytes of the buffer beginning at <code>offset</code> inclusive |
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* are copied to protect against subsequent modification. |
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* @param offset the offset in <code>iv</code> where the IV |
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* starts. |
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* @param len the number of IV bytes. |
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* @throws IllegalArgumentException if <code>iv</code> is <code>null</code> |
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* or {@code (iv.length - offset < len)} |
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* @throws ArrayIndexOutOfBoundsException is thrown if <code>offset</code> |
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* or <code>len</code> index bytes outside the <code>iv</code>. |
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*/ |
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public IvParameterSpec(byte[] iv, int offset, int len) { |
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if (iv == null) { |
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throw new IllegalArgumentException("IV missing"); |
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} |
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if (iv.length - offset < len) { |
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throw new IllegalArgumentException |
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("IV buffer too short for given offset/length combination"); |
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} |
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if (len < 0) { |
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throw new ArrayIndexOutOfBoundsException("len is negative"); |
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} |
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this.iv = new byte[len]; |
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System.arraycopy(iv, offset, this.iv, 0, len); |
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} |
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/** |
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* Returns the initialization vector (IV). |
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* |
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* @return the initialization vector (IV). Returns a new array |
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* each time this method is called. |
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*/ |
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public byte[] getIV() { |
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jjg
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changeset
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return this.iv.clone(); |
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} |
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} |