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    1   /*
    2    * Copyright (c) 2003, 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.io.IOException;
   29   import java.security.AlgorithmParametersSpi;
   30   import java.security.spec.AlgorithmParameterSpec;
   31   import java.security.spec.InvalidParameterSpecException;
   32   import javax.crypto.spec.RC2ParameterSpec;
   33   import sun.misc.HexDumpEncoder;
   34   import sun.security.util;
   35   
   36   /**
   37    * This class implements the parameter set used with RC2
   38    * encryption, which is defined in RFC2268 as follows:
   39    *
   40    * <pre>
   41    * RC2-CBCParameter ::= CHOICE {
   42    *   iv IV,
   43    *   params SEQUENCE {
   44    *     version RC2Version,
   45    *     iv IV
   46    *   }
   47    * }
   48    *
   49    * where
   50    *
   51    * IV ::= OCTET STRING -- 8 octets
   52    * RC2Version ::= INTEGER -- 1-1024
   53    * </pre>
   54    *
   55    * @author Sean Mullan
   56    * @since 1.5
   57    */
   58   
   59   public final class RC2Parameters extends AlgorithmParametersSpi {
   60   
   61       // TABLE[EKB] from section 6 of RFC 2268, used to convert effective key
   62       // size to/from encoded version number
   63       private final static int[] EKB_TABLE = new int[] {
   64           0xbd, 0x56, 0xea, 0xf2, 0xa2, 0xf1, 0xac, 0x2a,
   65           0xb0, 0x93, 0xd1, 0x9c, 0x1b, 0x33, 0xfd, 0xd0,
   66           0x30, 0x04, 0xb6, 0xdc, 0x7d, 0xdf, 0x32, 0x4b,
   67           0xf7, 0xcb, 0x45, 0x9b, 0x31, 0xbb, 0x21, 0x5a,
   68           0x41, 0x9f, 0xe1, 0xd9, 0x4a, 0x4d, 0x9e, 0xda,
   69           0xa0, 0x68, 0x2c, 0xc3, 0x27, 0x5f, 0x80, 0x36,
   70           0x3e, 0xee, 0xfb, 0x95, 0x1a, 0xfe, 0xce, 0xa8,
   71           0x34, 0xa9, 0x13, 0xf0, 0xa6, 0x3f, 0xd8, 0x0c,
   72           0x78, 0x24, 0xaf, 0x23, 0x52, 0xc1, 0x67, 0x17,
   73           0xf5, 0x66, 0x90, 0xe7, 0xe8, 0x07, 0xb8, 0x60,
   74           0x48, 0xe6, 0x1e, 0x53, 0xf3, 0x92, 0xa4, 0x72,
   75           0x8c, 0x08, 0x15, 0x6e, 0x86, 0x00, 0x84, 0xfa,
   76           0xf4, 0x7f, 0x8a, 0x42, 0x19, 0xf6, 0xdb, 0xcd,
   77           0x14, 0x8d, 0x50, 0x12, 0xba, 0x3c, 0x06, 0x4e,
   78           0xec, 0xb3, 0x35, 0x11, 0xa1, 0x88, 0x8e, 0x2b,
   79           0x94, 0x99, 0xb7, 0x71, 0x74, 0xd3, 0xe4, 0xbf,
   80           0x3a, 0xde, 0x96, 0x0e, 0xbc, 0x0a, 0xed, 0x77,
   81           0xfc, 0x37, 0x6b, 0x03, 0x79, 0x89, 0x62, 0xc6,
   82           0xd7, 0xc0, 0xd2, 0x7c, 0x6a, 0x8b, 0x22, 0xa3,
   83           0x5b, 0x05, 0x5d, 0x02, 0x75, 0xd5, 0x61, 0xe3,
   84           0x18, 0x8f, 0x55, 0x51, 0xad, 0x1f, 0x0b, 0x5e,
   85           0x85, 0xe5, 0xc2, 0x57, 0x63, 0xca, 0x3d, 0x6c,
   86           0xb4, 0xc5, 0xcc, 0x70, 0xb2, 0x91, 0x59, 0x0d,
   87           0x47, 0x20, 0xc8, 0x4f, 0x58, 0xe0, 0x01, 0xe2,
   88           0x16, 0x38, 0xc4, 0x6f, 0x3b, 0x0f, 0x65, 0x46,
   89           0xbe, 0x7e, 0x2d, 0x7b, 0x82, 0xf9, 0x40, 0xb5,
   90           0x1d, 0x73, 0xf8, 0xeb, 0x26, 0xc7, 0x87, 0x97,
   91           0x25, 0x54, 0xb1, 0x28, 0xaa, 0x98, 0x9d, 0xa5,
   92           0x64, 0x6d, 0x7a, 0xd4, 0x10, 0x81, 0x44, 0xef,
   93           0x49, 0xd6, 0xae, 0x2e, 0xdd, 0x76, 0x5c, 0x2f,
   94           0xa7, 0x1c, 0xc9, 0x09, 0x69, 0x9a, 0x83, 0xcf,
   95           0x29, 0x39, 0xb9, 0xe9, 0x4c, 0xff, 0x43, 0xab
   96       };
   97   
   98       // the iv
   99       private byte[] iv;
  100   
  101       // the version number
  102       private int version = 0;
  103   
  104       // the effective key size
  105       private int effectiveKeySize = 0;
  106   
  107       public RC2Parameters() {}
  108   
  109       protected void engineInit(AlgorithmParameterSpec paramSpec)
  110           throws InvalidParameterSpecException {
  111   
  112           if (!(paramSpec instanceof RC2ParameterSpec)) {
  113               throw new InvalidParameterSpecException
  114                   ("Inappropriate parameter specification");
  115           }
  116           RC2ParameterSpec rps = (RC2ParameterSpec) paramSpec;
  117   
  118           // check effective key size (a value of 0 means it is unspecified)
  119           effectiveKeySize = rps.getEffectiveKeyBits();
  120           if (effectiveKeySize != 0) {
  121               if (effectiveKeySize < 1 || effectiveKeySize > 1024) {
  122                   throw new InvalidParameterSpecException("RC2 effective key " +
  123                       "size must be between 1 and 1024 bits");
  124               }
  125               if (effectiveKeySize < 256) {
  126                   version = EKB_TABLE[effectiveKeySize];
  127               } else {
  128                   version = effectiveKeySize;
  129               }
  130           }
  131           this.iv = rps.getIV();
  132       }
  133   
  134       protected void engineInit(byte[] encoded) throws IOException {
  135           DerValue val = new DerValue(encoded);
  136           // check if IV or params
  137           if (val.tag == DerValue.tag_Sequence) {
  138               val.data.reset();
  139   
  140               version = val.data.getInteger();
  141               if (version < 0 || version > 1024) {
  142                   throw new IOException("RC2 parameter parsing error: " +
  143                       "version number out of legal range (0-1024): " + version);
  144               }
  145               if (version > 255) {
  146                   effectiveKeySize = version;
  147               } else {
  148                   // search table for index containing version
  149                   for (int i = 0; i < EKB_TABLE.length; i++) {
  150                       if (version == EKB_TABLE[i]) {
  151                           effectiveKeySize = i;
  152                           break;
  153                       }
  154                   }
  155               }
  156   
  157               iv = val.data.getOctetString();
  158           } else {
  159               val.data.reset();
  160               iv = val.getOctetString();
  161               version = 0;
  162               effectiveKeySize = 0;
  163           }
  164   
  165           if (iv.length != 8) {
  166               throw new IOException("RC2 parameter parsing error: iv length " +
  167                   "must be 8 bits, actual: " + iv.length);
  168           }
  169   
  170           if (val.data.available() != 0) {
  171               throw new IOException("RC2 parameter parsing error: extra data");
  172           }
  173       }
  174   
  175       protected void engineInit(byte[] encoded, String decodingMethod)
  176           throws IOException {
  177           engineInit(encoded);
  178       }
  179   
  180       protected AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec)
  181           throws InvalidParameterSpecException {
  182   
  183           if (RC2ParameterSpec.class.isAssignableFrom(paramSpec)) {
  184               return (iv == null ?
  185                       new RC2ParameterSpec(effectiveKeySize) :
  186                       new RC2ParameterSpec(effectiveKeySize, iv));
  187           } else {
  188               throw new InvalidParameterSpecException
  189                   ("Inappropriate parameter specification");
  190           }
  191       }
  192   
  193       protected byte[] engineGetEncoded() throws IOException {
  194           DerOutputStream out = new DerOutputStream();
  195           DerOutputStream bytes = new DerOutputStream();
  196   
  197           if (this.effectiveKeySize != 0) {
  198               bytes.putInteger(version);
  199               bytes.putOctetString(iv);
  200               out.write(DerValue.tag_Sequence, bytes);
  201           } else {
  202               out.putOctetString(iv);
  203           }
  204   
  205           return out.toByteArray();
  206       }
  207   
  208       protected byte[] engineGetEncoded(String encodingMethod)
  209           throws IOException {
  210           return engineGetEncoded();
  211       }
  212   
  213       /*
  214        * Returns a formatted string describing the parameters.
  215        */
  216       protected String engineToString() {
  217           String LINE_SEP = System.getProperty("line.separator");
  218           HexDumpEncoder encoder = new HexDumpEncoder();
  219           StringBuilder sb
  220               = new StringBuilder(LINE_SEP + "    iv:" + LINE_SEP + "["
  221                   + encoder.encodeBuffer(iv) + "]");
  222   
  223           if (version != 0) {
  224               sb.append(LINE_SEP + "version:" + LINE_SEP
  225                   + version + LINE_SEP);
  226           }
  227           return sb.toString();
  228       }
  229   }

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