|
Java example source code file (BlockCipherParamsCore.java)
The BlockCipherParamsCore.java Java example source code/* * Copyright (c) 2002, 2011, 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 com.sun.crypto.provider; import java.io.*; import sun.security.util.*; import sun.misc.HexDumpEncoder; import java.security.spec.AlgorithmParameterSpec; import java.security.spec.InvalidParameterSpecException; import javax.crypto.spec.IvParameterSpec; /** * This class implements the parameter (IV) used with Block Ciphers * in feedback-mode. IV is defined in the standards as follows: * * <pre> * IV ::= OCTET STRING -- length depends on the block size of the * block ciphers * </pre> * * @author Valerie Peng * */ final class BlockCipherParamsCore { private int block_size = 0; private byte[] iv = null; BlockCipherParamsCore(int blksize) { block_size = blksize; } void init(AlgorithmParameterSpec paramSpec) throws InvalidParameterSpecException { if (!(paramSpec instanceof IvParameterSpec)) { throw new InvalidParameterSpecException ("Inappropriate parameter specification"); } byte[] tmpIv = ((IvParameterSpec)paramSpec).getIV(); if (tmpIv.length != block_size) { throw new InvalidParameterSpecException("IV not " + block_size + " bytes long"); } iv = tmpIv.clone(); } void init(byte[] encoded) throws IOException { DerInputStream der = new DerInputStream(encoded); byte[] tmpIv = der.getOctetString(); if (der.available() != 0) { throw new IOException("IV parsing error: extra data"); } if (tmpIv.length != block_size) { throw new IOException("IV not " + block_size + " bytes long"); } iv = tmpIv; } void init(byte[] encoded, String decodingMethod) throws IOException { if ((decodingMethod != null) && (!decodingMethod.equalsIgnoreCase("ASN.1"))) { throw new IllegalArgumentException("Only support ASN.1 format"); } init(encoded); } <T extends AlgorithmParameterSpec> T getParameterSpec(Class Other Java examples (source code examples)Here is a short list of links related to this Java BlockCipherParamsCore.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.