/*
* Copyright (c) 2002, 2007, 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
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package com.sun.crypto.provider;
import java.util.*;
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 = (byte[]) 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);
}
AlgorithmParameterSpec getParameterSpec(Class paramSpec)
throws InvalidParameterSpecException
{
if (IvParameterSpec.class.isAssignableFrom(paramSpec)) {
return new IvParameterSpec(this.iv);
} else {
throw new InvalidParameterSpecException
("Inappropriate parameter specification");
}
}
byte[] getEncoded() throws IOException {
DerOutputStream out = new DerOutputStream();
out.putOctetString(this.iv);
return out.toByteArray();
}
byte[] getEncoded(String encodingMethod)
throws IOException {
return getEncoded();
}
/*
* Returns a formatted string describing the parameters.
*/
public String toString() {
String LINE_SEP = System.getProperty("line.separator");
String ivString = LINE_SEP + " iv:" + LINE_SEP + "[";
HexDumpEncoder encoder = new HexDumpEncoder();
ivString += encoder.encodeBuffer(this.iv);
ivString += "]" + LINE_SEP;
return ivString;
}
}