khazad.java

linux下建立JAVA虚拟机的源码KAFFE

/* Khazad.java -- 
   Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version.  */


package gnu.javax.crypto.cipher;

import gnu.java.security.Registry;
import gnu.java.security.util.Util;

//import java.io.PrintWriter;
import java.security.InvalidKeyException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;

/**
 * <p>Khazad is a 64-bit (legacy-level) block cipher that accepts a 128-bit key.
 * The cipher is a uniform substitution-permutation network whose inverse only
 * differs from the forward operation in the key schedule. The overall cipher
 * design follows the Wide Trail strategy, favours component reuse, and permits
 * a wide variety of implementation trade-offs.</p>
 *
 * <p>References:</p>
 *
 * <ol>
 *    <li><a href="http://planeta.terra.com.br/informatica/paulobarreto/KhazadPage.html">The
 *    Khazad Block Cipher</a>.<br>
 *    <a href="mailto:[e-mail]">Paulo S.L.M. Barreto</a> and
 *    <a href="mailto:[e-mail]">Vincent Rijmen</a>.</li>
 * </ol>
 */
public final class Khazad extends BaseCipher
{

  // Debugging methods and variables
  // -------------------------------------------------------------------------

  //   private static final String NAME = "khazad";
  private static final boolean DEBUG = false;

  private static final int debuglevel = 9;

  //   private static final PrintWriter err = new PrintWriter(System.out, true);
  //   private static void debug(String s) {
  //      err.println(">>> "+NAME+": "+s);
  //   }

  // Constants and variables
  // -------------------------------------------------------------------------

  private static final int DEFAULT_BLOCK_SIZE = 8; // in bytes

  private static final int DEFAULT_KEY_SIZE = 16; // in bytes

  private static final int R = 8; // standard number of rounds; para. 3.7

  private static final String Sd = // p. 20 [KHAZAD]
  "\uBA54\u2F74\u53D3\uD24D\u50AC\u8DBF\u7052\u9A4C"
      + "\uEAD5\u97D1\u3351\u5BA6\uDE48\uA899\uDB32\uB7FC"
      + "\uE39E\u919B\uE2BB\u416E\uA5CB\u6B95\uA1F3\uB102"
      + "\uCCC4\u1D14\uC363\uDA5D\u5FDC\u7DCD\u7F5A\u6C5C"
      + "\uF726\uFFED\uE89D\u6F8E\u19A0\uF089\u0F07\uAFFB"
      + "\u0815\u0D04\u0164\uDF76\u79DD\u3D16\u3F37\u6D38"
      + "\uB973\uE935\u5571\u7B8C\u7288\uF62A\u3E5E\u2746"
      + "\u0C65\u6861\u03C1\u57D6\uD958\uD866\uD73A\uC83C"
      + "\uFA96\uA798\uECB8\uC7AE\u694B\uABA9\u670A\u47F2"
      + "\uB522\uE5EE\uBE2B\u8112\u831B\u0E23\uF545\u21CE"
      + "\u492C\uF9E6\uB628\u1782\u1A8B\uFE8A\u09C9\u874E"
      + "\uE12E\uE4E0\uEB90\uA41E\u8560\u0025\uF4F1\u940B"
      + "\uE775\uEF34\u31D4\uD086\u7EAD\uFD29\u303B\u9FF8"
      + "\uC613\u0605\uC511\u777C\u7A78\u361C\u3959\u1856"
      + "\uB3B0\u2420\uB292\uA3C0\u4462\u10B4\u8443\u93C2"
      + "\u4ABD\u8F2D\uBC9C\u6A40\uCFA2\u804F\u1FCA\uAA42";

  private static final byte[] S = new byte[256];

  private static final int[] T0 = new int[256];

  private static final int[] T1 = new int[256];

  private static final int[] T2 = new int[256];

  private static final int[] T3 = new int[256];

  private static final int[] T4 = new int[256];

  private static final int[] T5 = new int[256];

  private static final int[] T6 = new int[256];

  private static final int[] T7 = new int[256];

  private static final int[][] rc = new int[R + 1][2]; // round constants

  /**
   * KAT vector (from ecb_vk):
   * I=120
   * KEY=00000000000000000000000000000100
   * CT=A0C86A1BBE2CBF4C
   */
  private static final byte[] KAT_KEY = Util.toBytesFromString("00000000000000000000000000000100");

  private static final byte[] KAT_CT = Util.toBytesFromString("A0C86A1BBE2CBF4C");

  /** caches the result of the correctness test, once executed. */
  private static Boolean valid;

  // Static code - to intialise lookup tables --------------------------------

  static
    {
      long time = System.currentTimeMillis();

      long ROOT = 0x11d; // para. 2.1 [KHAZAD]
      int i, j;
      int s, s2, s3, s4, s5, s6, s7, s8, sb;
      char c;
      for (i = 0; i < 256; i++)
        {
          c = Sd.charAt(i >>> 1);
          s = ((i & 1) == 0 ? c >>> 8 : c) & 0xFF;
          S[i] = (byte) s;

          s2 = s << 1;
          if (s2 > 0xFF)
            s2 ^= ROOT;

          s3 = s2 ^ s;
          s4 = s2 << 1;
          if (s4 > 0xFF)
            s4 ^= ROOT;

          s5 = s4 ^ s;
          s6 = s4 ^ s2;
          s7 = s6 ^ s;
          s8 = s4 << 1;
          if (s8 > 0xFF)
            s8 ^= ROOT;

          sb = s8 ^ s2 ^ s;

          T0[i] = s << 24 | s3 << 16 | s4 << 8 | s5;
          T1[i] = s3 << 24 | s << 16 | s5 << 8 | s4;
          T2[i] = s4 << 24 | s5 << 16 | s << 8 | s3;
          T3[i] = s5 << 24 | s4 << 16 | s3 << 8 | s;
          T4[i] = s6 << 24 | s8 << 16 | sb << 8 | s7;
          T5[i] = s8 << 24 | s6 << 16 | s7 << 8 | sb;
          T6[i] = sb << 24 | s7 << 16 | s6 << 8 | s8;
          T7[i] = s7 << 24 | sb << 16 | s8 << 8 | s6;
        }

      for (i = 0, j = 0; i < R + 1; i++)
        {
          // compute round constant
          rc[i][0] = S[j++] << 24 | (S[j++] & 0xFF) << 16
                     | (S[j++] & 0xFF) << 8 | (S[j++] & 0xFF);
          rc[i][1] = S[j++] << 24 | (S[j++] & 0xFF) << 16
                     | (S[j++] & 0xFF) << 8 | (S[j++] & 0xFF);
        }

      time = System.currentTimeMillis() - time;

      if (DEBUG && debuglevel > 8)
        {
          System.out.println("==========");
          System.out.println();
          System.out.println("Static data");
          System.out.println();

          System.out.println();
          System.out.println("T0[]:");
          for (i = 0; i < 64; i++)
            {
              for (j = 0; j < 4; j++)
                System.out.print("0x" + Util.toString(T0[i * 4 + j]) + ", ");
              System.out.println();
            }
          System.out.println();
          System.out.println("T1[]:");
          for (i = 0; i < 64; i++)
            {
              for (j = 0; j < 4; j++)
                System.out.print("0x" + Util.toString(T1[i * 4 + j]) + ", ");
              System.out.println();
            }
          System.out.println();
          System.out.println("T2[]:");
          for (i = 0; i < 64; i++)
            {
              for (j = 0; j < 4; j++)
                System.out.print("0x" + Util.toString(T2[i * 4 + j]) + ", ");
              System.out.println();
            }
          System.out.println();
          System.out.println("T3[]:");
          for (i = 0; i < 64; i++)
            {
              for (j = 0; j < 4; j++)
                System.out.print("0x" + Util.toString(T3[i * 4 + j]) + ", ");
              System.out.println();
            }
          System.out.println();
          System.out.println("T4[]:");
          for (i = 0; i < 64; i++)
            {
              for (j = 0; j < 4; j++)
                System.out.print("0x" + Util.toString(T4[i * 4 + j]) + ", ");
              System.out.println();
            }
          System.out.println();
          System.out.println("T5[]:");
          for (i = 0; i < 64; i++)
            {
              for (j = 0; j < 4; j++)
                System.out.print("0x" + Util.toString(T5[i * 4 + j]) + ", ");
              System.out.println();
            }
          System.out.println();
          System.out.println("T6[]:");
          for (i = 0; i < 64; i++)
            {
              for (j = 0; j < 4; j++)
                System.out.print("0x" + Util.toString(T6[i * 4 + j]) + ", ");
              System.out.println();
            }
          System.out.println();
          System.out.println("T7[]:");