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/*
 * =============================================================================
 * 
 *   Copyright (c) 2019, The JASYPT team (http://www.jasypt.org)
 * 
 *   Licensed 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.
 * 
 * =============================================================================
 */
package org.jasypt.iv;

import org.jasypt.commons.CommonUtils;
import org.jasypt.exceptions.EncryptionInitializationException;

/**
 * 

* Byte-array based implementation of {@link FixedIvGenerator}, that will * always return the same initialization vector (IV). *

*

* If the requested IV has a size in bytes smaller than the specified IV, * the first n bytes are returned. If it is larger, an exception is thrown. *

*

* This class is thread-safe. *

* * @since 1.9.3 * * @author Hoki Torres * */ public class ByteArrayFixedIvGenerator implements FixedIvGenerator { private final byte[] iv; /** * Creates a new instance of FixedByteArrayIvGenerator * * @param iv the specified iv. */ public ByteArrayFixedIvGenerator(final byte[] iv) { super(); CommonUtils.validateNotNull(iv, "Initialization vector cannot be set null"); this.iv = (byte[]) iv.clone(); } /** * Return iv with the specified byte length. * * @param lengthBytes length in bytes. * @return the generated iv. */ public byte[] generateIv(final int lengthBytes) { if (this.iv.length < lengthBytes) { throw new EncryptionInitializationException( "Requested initialization vector larger than set"); } final byte[] generatedIv = new byte[lengthBytes]; System.arraycopy(this.iv, 0, generatedIv, 0, lengthBytes); return generatedIv; } /** * As this iv generator provides a fixed iv, its inclusion * unencrypted in encryption results * is not necessary, and in fact not desirable (so that it remains hidden). * * @return false */ public boolean includePlainIvInEncryptionResults() { return false; } }




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