103 lines
3.8 KiB
Java
103 lines
3.8 KiB
Java
/*
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* Copyright (c) 1997, 2021, 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 (offset < 0) {
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throw new ArrayIndexOutOfBoundsException("offset is negative");
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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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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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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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return this.iv.clone();
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}
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}
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