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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Alexander Y. Kleymenov
* @version $Revision$
*/
package javax.crypto.spec;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Arrays;
/**
* The algorithm parameter specification for an <i>initialization vector</i>.
*/
public class IvParameterSpec implements AlgorithmParameterSpec {
private final byte[] iv;
/**
* Creates a new <code>IvParameterSpec</code> instance with the bytes from
* the specified buffer <i>iv</i> used as <i>initialization vector</i>.
*
* @param iv
* the buffer used as initialization vector.
* @throws NullPointerException
* if the specified buffer is null.
*/
public IvParameterSpec(byte[] iv) {
if (iv == null) {
throw new NullPointerException("iv == null");
}
this.iv = new byte[iv.length];
System.arraycopy(iv, 0, this.iv, 0, iv.length);
}
/**
* Creates a new <code>IvParameterSpec</code> instance with <code>byteCount</code>
* bytes from the specified buffer <code>iv</code> starting at
* <code>offset</code>.
*
* @throws IllegalArgumentException
* if the specified buffer is null or <code>offset</code> and
* <code>byteCount</code> do not specify a valid chunk in the
* specified buffer.
* @throws ArrayIndexOutOfBoundsException
* if <code>offset</code> or <code>byteCount</code> are negative.
*/
public IvParameterSpec(byte[] iv, int offset, int byteCount) {
if ((iv == null) || (iv.length - offset < byteCount)) {
throw new IllegalArgumentException();
}
Arrays.checkOffsetAndCount(iv.length, offset, byteCount);
this.iv = new byte[byteCount];
System.arraycopy(iv, offset, this.iv, 0, byteCount);
}
/**
* Returns a copy of the <i>initialization vector</i> data.
*
* @return a copy of the initialization vector data.
*/
public byte[] getIV() {
byte[] res = new byte[iv.length];
System.arraycopy(iv, 0, res, 0, iv.length);
return res;
}
}
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