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    1   /*
    2    * Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package com.sun.crypto.provider;
   27   
   28   import java.util;
   29   import java.io;
   30   import sun.security.util;
   31   import sun.misc.HexDumpEncoder;
   32   import java.security.spec.AlgorithmParameterSpec;
   33   import java.security.spec.InvalidParameterSpecException;
   34   import javax.crypto.spec.IvParameterSpec;
   35   
   36   /**
   37    * This class implements the parameter (IV) used with Block Ciphers
   38    * in feedback-mode. IV is defined in the standards as follows:
   39    *
   40    * <pre>
   41    * IV ::= OCTET STRING  -- length depends on the block size of the
   42    * block ciphers
   43    * </pre>
   44    *
   45    * @author Valerie Peng
   46    *
   47    */
   48   final class BlockCipherParamsCore {
   49       private int block_size = 0;
   50       private byte[] iv = null;
   51   
   52       BlockCipherParamsCore(int blksize) {
   53           block_size = blksize;
   54       }
   55   
   56       void init(AlgorithmParameterSpec paramSpec)
   57           throws InvalidParameterSpecException {
   58           if (!(paramSpec instanceof IvParameterSpec)) {
   59               throw new InvalidParameterSpecException
   60                   ("Inappropriate parameter specification");
   61           }
   62           byte[] tmpIv = ((IvParameterSpec)paramSpec).getIV();
   63           if (tmpIv.length != block_size) {
   64               throw new InvalidParameterSpecException("IV not " +
   65                           block_size + " bytes long");
   66           }
   67           iv = (byte[]) tmpIv.clone();
   68       }
   69   
   70       void init(byte[] encoded) throws IOException {
   71           DerInputStream der = new DerInputStream(encoded);
   72   
   73           byte[] tmpIv = der.getOctetString();
   74           if (der.available() != 0) {
   75               throw new IOException("IV parsing error: extra data");
   76           }
   77           if (tmpIv.length != block_size) {
   78               throw new IOException("IV not " + block_size +
   79                   " bytes long");
   80           }
   81           iv = tmpIv;
   82       }
   83   
   84       void init(byte[] encoded, String decodingMethod)
   85           throws IOException {
   86           if ((decodingMethod != null) &&
   87               (!decodingMethod.equalsIgnoreCase("ASN.1"))) {
   88               throw new IllegalArgumentException("Only support ASN.1 format");
   89           }
   90           init(encoded);
   91       }
   92   
   93       AlgorithmParameterSpec getParameterSpec(Class paramSpec)
   94           throws InvalidParameterSpecException
   95       {
   96           if (IvParameterSpec.class.isAssignableFrom(paramSpec)) {
   97               return new IvParameterSpec(this.iv);
   98           } else {
   99               throw new InvalidParameterSpecException
  100                   ("Inappropriate parameter specification");
  101           }
  102       }
  103   
  104       byte[] getEncoded() throws IOException {
  105           DerOutputStream out = new DerOutputStream();
  106           out.putOctetString(this.iv);
  107           return out.toByteArray();
  108       }
  109   
  110       byte[] getEncoded(String encodingMethod)
  111           throws IOException {
  112           return getEncoded();
  113       }
  114   
  115       /*
  116        * Returns a formatted string describing the parameters.
  117        */
  118       public String toString() {
  119           String LINE_SEP = System.getProperty("line.separator");
  120   
  121           String ivString = LINE_SEP + "    iv:" + LINE_SEP + "[";
  122           HexDumpEncoder encoder = new HexDumpEncoder();
  123           ivString += encoder.encodeBuffer(this.iv);
  124           ivString += "]" + LINE_SEP;
  125           return ivString;
  126       }
  127   }

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