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package com.sun.crypto.provider;

import java.io.*;
import sun.security.util.*;
import sun.security.util.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:
IV ::= OCTET STRING  -- length depends on the block size of the
block ciphers
Author:Valerie Peng
/** * 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<T> paramSpec) throws InvalidParameterSpecException { if (IvParameterSpec.class.isAssignableFrom(paramSpec)) { return paramSpec.cast(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; } }