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/* Whirlpool.java --

   Copyright (C) 2001, 2002, 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.java.security.hash;

import gnu.java.lang.CPStringBuilder;

import gnu.java.security.Configuration;

import gnu.java.security.Registry;

import gnu.java.security.util.Util;

import java.util.logging.Logger;

/**

 * Whirlpool, a new 512-bit hashing function operating on messages less than

 * 2 ** 256 bits in length. The function structure is designed according to the

 * Wide Trail strategy and permits a wide variety of implementation trade-offs.

 * <p>

 * This implementation is of Whirlpool Version 3, described in [1] last revised

 * on May 24th, 2003.

 * <p>

 * <b>IMPORTANT</b>: This implementation is not thread-safe.

 * <p>

 * References:

 * <ol>

 *    <li><a href="http://planeta.terra.com.br/informatica/paulobarreto/WhirlpoolPage.html">

 *    The WHIRLPOOL Hashing Function</a>.<br>

 *    <a href="mailto:paulo.barreto@terra.com.br">Paulo S.L.M. Barreto</a> and

 *    <a href="mailto:vincent.rijmen@iaik.tugraz.at">Vincent Rijmen</a>.</li>

 * </ol>

 */

public final class Whirlpool

    extends BaseHash

{

  private static final Logger log = Logger.getLogger(Whirlpool.class.getName());

  private static final int BLOCK_SIZE = 64; // inner block size in bytes

  /** The digest of the 0-bit long message. */

  private static final String DIGEST0 =

      "19FA61D75522A4669B44E39C1D2E1726C530232130D407F89AFEE0964997F7A7"

    + "3E83BE698B288FEBCF88E3E03C4F0757EA8964E59B63D93708B138CC42A66EB3";

  /** Default number of rounds. */

  private static final int R = 10;

  /** Whirlpool S-box; p. 19. */

  private static final String S_box = // p. 19 [WHIRLPOOL]

      "\u1823\uc6E8\u87B8\u014F\u36A6\ud2F5\u796F\u9152"

    + "\u60Bc\u9B8E\uA30c\u7B35\u1dE0\ud7c2\u2E4B\uFE57"

    + "\u1577\u37E5\u9FF0\u4AdA\u58c9\u290A\uB1A0\u6B85"

    + "\uBd5d\u10F4\ucB3E\u0567\uE427\u418B\uA77d\u95d8"

    + "\uFBEE\u7c66\udd17\u479E\ucA2d\uBF07\uAd5A\u8333"

    + "\u6302\uAA71\uc819\u49d9\uF2E3\u5B88\u9A26\u32B0"

    + "\uE90F\ud580\uBEcd\u3448\uFF7A\u905F\u2068\u1AAE"

    + "\uB454\u9322\u64F1\u7312\u4008\uc3Ec\udBA1\u8d3d"

    + "\u9700\ucF2B\u7682\ud61B\uB5AF\u6A50\u45F3\u30EF"

    + "\u3F55\uA2EA\u65BA\u2Fc0\udE1c\uFd4d\u9275\u068A"

    + "\uB2E6\u0E1F\u62d4\uA896\uF9c5\u2559\u8472\u394c"

    + "\u5E78\u388c\ud1A5\uE261\uB321\u9c1E\u43c7\uFc04"

    + "\u5199\u6d0d\uFAdF\u7E24\u3BAB\ucE11\u8F4E\uB7EB"

    + "\u3c81\u94F7\uB913\u2cd3\uE76E\uc403\u5644\u7FA9"

    + "\u2ABB\uc153\udc0B\u9d6c\u3174\uF646\uAc89\u14E1"

    + "\u163A\u6909\u70B6\ud0Ed\ucc42\u98A4\u285c\uF886";

  /** The 64-bit lookup tables; section 7.1 p. 13. */

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

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

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

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

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

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

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

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

  /** The round constants. */

  private static final long[] rc = new long[R];

  /** caches the result of the correctness test, once executed. */

  private static Boolean valid;

  /** The 512-bit context as 8 longs. */

  private long H0, H1, H2, H3, H4, H5, H6, H7;

  /** Work area for computing the round key schedule. */

  private long k00, k01, k02, k03, k04, k05, k06, k07;

  private long Kr0, Kr1, Kr2, Kr3, Kr4, Kr5, Kr6, Kr7;

  /** work area for transforming the 512-bit buffer. */

  private long n0, n1, n2, n3, n4, n5, n6, n7;

  private long nn0, nn1, nn2, nn3, nn4, nn5, nn6, nn7;

  /** work area for holding block cipher's intermediate values. */

  private long w0, w1, w2, w3, w4, w5, w6, w7;

  static

    {

      long time = System.currentTimeMillis();

      int ROOT = 0x11D; // para. 2.1 [WHIRLPOOL]

      int i, r, j;

      long s1, s2, s4, s5, s8, s9, t;

      char c;

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

      for (i = 0; i < 256; i++)

        {

          c = S_box.charAt(i >>> 1);

          s1 = ((i & 1) == 0 ? c >>> 8 : c) & 0xFFL;

          s2 = s1 << 1;

          if (s2 > 0xFFL)

            s2 ^= ROOT;

          s4 = s2 << 1;

          if (s4 > 0xFFL)

            s4 ^= ROOT;

          s5 = s4 ^ s1;

          s8 = s4 << 1;

          if (s8 > 0xFFL)

            s8 ^= ROOT;

          s9 = s8 ^ s1;

          T0[i] = t = s1 << 56 | s1 << 48 | s4 << 40 | s1 << 32

                    | s8 << 24 | s5 << 16 | s2 <<  8 | s9;

          T1[i] = t >>>  8 | t << 56;

          T2[i] = t >>> 16 | t << 48;

          T3[i] = t >>> 24 | t << 40;

          T4[i] = t >>> 32 | t << 32;

          T5[i] = t >>> 40 | t << 24;

          T6[i] = t >>> 48 | t << 16;

          T7[i] = t >>> 56 | t <<  8;

        }

      for (r = 0, i = 0; r < R; )

        rc[r++] = (T0[i++] & 0xFF00000000000000L)

                ^ (T1[i++] & 0x00FF000000000000L)

                ^ (T2[i++] & 0x0000FF0000000000L)

                ^ (T3[i++] & 0x000000FF00000000L)

                ^ (T4[i++] & 0x00000000FF000000L)

                ^ (T5[i++] & 0x0000000000FF0000L)

                ^ (T6[i++] & 0x000000000000FF00L)

                ^ (T7[i++] & 0x00000000000000FFL);

      time = System.currentTimeMillis() - time;

      if (Configuration.DEBUG)

        {

          log.fine("Static data");

          log.fine("T0[]:");

          CPStringBuilder sb;

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T0[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("T1[]:");

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T1[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("T2[]:");

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T2[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("T3[]:");

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T3[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("\nT4[]:");

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T4[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("T5[]:");

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T5[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("T6[]:");

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T5[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("T7[]:");

          for (i = 0; i < 64; i++)

            {

              sb = new CPStringBuilder();

              for (j = 0; j < 4; j++)

                sb.append("0x").append(Util.toString(T5[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("rc[]:");

          for (i = 0; i < R; i++)

            log.fine("0x" + Util.toString(rc[i]));

          log.fine("Total initialization time: " + time + " ms.");

        }

    }

  /** Trivial 0-arguments constructor. */

  public Whirlpool()

  {

    super(Registry.WHIRLPOOL_HASH, 20, BLOCK_SIZE);

  }

  /**

   * Private constructor for cloning purposes.

   *

   * @param md the instance to clone.

   */

  private Whirlpool(Whirlpool md)

  {

    this();

    this.H0 = md.H0;

    this.H1 = md.H1;

    this.H2 = md.H2;

    this.H3 = md.H3;

    this.H4 = md.H4;

    this.H5 = md.H5;

    this.H6 = md.H6;

    this.H7 = md.H7;

    this.count = md.count;

    this.buffer = (byte[]) md.buffer.clone();

  }

  public Object clone()

  {

    return (new Whirlpool(this));

  }

  protected void transform(byte[] in, int offset)

  {

    // apply mu to the input

    n0 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    n1 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    n2 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    n3 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    n4 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    n5 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    n6 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    n7 = (in[offset++] & 0xFFL) << 56

       | (in[offset++] & 0xFFL) << 48

       | (in[offset++] & 0xFFL) << 40

       | (in[offset++] & 0xFFL) << 32

       | (in[offset++] & 0xFFL) << 24

       | (in[offset++] & 0xFFL) << 16

       | (in[offset++] & 0xFFL) <<  8

       | (in[offset++] & 0xFFL);

    // transform K into the key schedule Kr; 0 <= r <= R

    k00 = H0;

    k01 = H1;

    k02 = H2;

    k03 = H3;

    k04 = H4;

    k05 = H5;

    k06 = H6;

    k07 = H7;

    nn0 = n0 ^ k00;

    nn1 = n1 ^ k01;

    nn2 = n2 ^ k02;

    nn3 = n3 ^ k03;

    nn4 = n4 ^ k04;

    nn5 = n5 ^ k05;

    nn6 = n6 ^ k06;

    nn7 = n7 ^ k07;

    // intermediate cipher output

    w0 = w1 = w2 = w3 = w4 = w5 = w6 = w7 = 0L;

    for (int r = 0; r < R; r++)

      {

        // 1. compute intermediate round key schedule by applying ro[rc]

        // to the previous round key schedule --rc being the round constant

        Kr0 = T0[(int)((k00 >> 56) & 0xFFL)]

            ^ T1[(int)((k07 >> 48) & 0xFFL)]

            ^ T2[(int)((k06 >> 40) & 0xFFL)]

            ^ T3[(int)((k05 >> 32) & 0xFFL)]

            ^ T4[(int)((k04 >> 24) & 0xFFL)]

            ^ T5[(int)((k03 >> 16) & 0xFFL)]

            ^ T6[(int)((k02 >>  8) & 0xFFL)]

            ^ T7[(int)( k01        & 0xFFL)] ^ rc[r];

        Kr1 = T0[(int)((k01 >> 56) & 0xFFL)]

            ^ T1[(int)((k00 >> 48) & 0xFFL)]

            ^ T2[(int)((k07 >> 40) & 0xFFL)]

            ^ T3[(int)((k06 >> 32) & 0xFFL)]

            ^ T4[(int)((k05 >> 24) & 0xFFL)]

            ^ T5[(int)((k04 >> 16) & 0xFFL)]

            ^ T6[(int)((k03 >>  8) & 0xFFL)]

            ^ T7[(int)( k02        & 0xFFL)];

        Kr2 = T0[(int)((k02 >> 56) & 0xFFL)]

            ^ T1[(int)((k01 >> 48) & 0xFFL)]

            ^ T2[(int)((k00 >> 40) & 0xFFL)]

            ^ T3[(int)((k07 >> 32) & 0xFFL)]

            ^ T4[(int)((k06 >> 24) & 0xFFL)]

            ^ T5[(int)((k05 >> 16) & 0xFFL)]

            ^ T6[(int)((k04 >>  8) & 0xFFL)]

            ^ T7[(int)( k03        & 0xFFL)];

        Kr3 = T0[(int)((k03 >> 56) & 0xFFL)]

            ^ T1[(int)((k02 >> 48) & 0xFFL)]

            ^ T2[(int)((k01 >> 40) & 0xFFL)]

            ^ T3[(int)((k00 >> 32) & 0xFFL)]

            ^ T4[(int)((k07 >> 24) & 0xFFL)]

            ^ T5[(int)((k06 >> 16) & 0xFFL)]

            ^ T6[(int)((k05 >>  8) & 0xFFL)]

            ^ T7[(int)( k04        & 0xFFL)];

        Kr4 = T0[(int)((k04 >> 56) & 0xFFL)]

            ^ T1[(int)((k03 >> 48) & 0xFFL)]

            ^ T2[(int)((k02 >> 40) & 0xFFL)]

            ^ T3[(int)((k01 >> 32) & 0xFFL)]

            ^ T4[(int)((k00 >> 24) & 0xFFL)]

            ^ T5[(int)((k07 >> 16) & 0xFFL)]

            ^ T6[(int)((k06 >>  8) & 0xFFL)]

            ^ T7[(int)( k05        & 0xFFL)];

        Kr5 = T0[(int)((k05 >> 56) & 0xFFL)]

            ^ T1[(int)((k04 >> 48) & 0xFFL)]

            ^ T2[(int)((k03 >> 40) & 0xFFL)]

            ^ T3[(int)((k02 >> 32) & 0xFFL)]

            ^ T4[(int)((k01 >> 24) & 0xFFL)]

            ^ T5[(int)((k00 >> 16) & 0xFFL)]

            ^ T6[(int)((k07 >>  8) & 0xFFL)]

            ^ T7[(int)( k06        & 0xFFL)];

        Kr6 = T0[(int)((k06 >> 56) & 0xFFL)]

            ^ T1[(int)((k05 >> 48) & 0xFFL)]

            ^ T2[(int)((k04 >> 40) & 0xFFL)]

            ^ T3[(int)((k03 >> 32) & 0xFFL)]

            ^ T4[(int)((k02 >> 24) & 0xFFL)]

            ^ T5[(int)((k01 >> 16) & 0xFFL)]

            ^ T6[(int)((k00 >>  8) & 0xFFL)]

            ^ T7[(int)( k07        & 0xFFL)];

        Kr7 = T0[(int)((k07 >> 56) & 0xFFL)]

            ^ T1[(int)((k06 >> 48) & 0xFFL)]

            ^ T2[(int)((k05 >> 40) & 0xFFL)]

            ^ T3[(int)((k04 >> 32) & 0xFFL)]

            ^ T4[(int)((k03 >> 24) & 0xFFL)]

            ^ T5[(int)((k02 >> 16) & 0xFFL)]

            ^ T6[(int)((k01 >>  8) & 0xFFL)]

            ^ T7[(int)( k00        & 0xFFL)];

        k00 = Kr0;

        k01 = Kr1;

        k02 = Kr2;

        k03 = Kr3;

        k04 = Kr4;

        k05 = Kr5;

        k06 = Kr6;

        k07 = Kr7;

        // 2. incrementally compute the cipher output

        w0 = T0[(int)((nn0 >> 56) & 0xFFL)]

           ^ T1[(int)((nn7 >> 48) & 0xFFL)]

           ^ T2[(int)((nn6 >> 40) & 0xFFL)]

           ^ T3[(int)((nn5 >> 32) & 0xFFL)]

           ^ T4[(int)((nn4 >> 24) & 0xFFL)]

           ^ T5[(int)((nn3 >> 16) & 0xFFL)]

           ^ T6[(int)((nn2 >>  8) & 0xFFL)]

           ^ T7[(int)( nn1        & 0xFFL)] ^ Kr0;

        w1 = T0[(int)((nn1 >> 56) & 0xFFL)]

           ^ T1[(int)((nn0 >> 48) & 0xFFL)]

           ^ T2[(int)((nn7 >> 40) & 0xFFL)]

           ^ T3[(int)((nn6 >> 32) & 0xFFL)]

           ^ T4[(int)((nn5 >> 24) & 0xFFL)]

           ^ T5[(int)((nn4 >> 16) & 0xFFL)]

           ^ T6[(int)((nn3 >>  8) & 0xFFL)]

           ^ T7[(int)( nn2        & 0xFFL)] ^ Kr1;

        w2 = T0[(int)((nn2 >> 56) & 0xFFL)]

           ^ T1[(int)((nn1 >> 48) & 0xFFL)]

           ^ T2[(int)((nn0 >> 40) & 0xFFL)]

           ^ T3[(int)((nn7 >> 32) & 0xFFL)]

           ^ T4[(int)((nn6 >> 24) & 0xFFL)]

           ^ T5[(int)((nn5 >> 16) & 0xFFL)]

           ^ T6[(int)((nn4 >>  8) & 0xFFL)]

           ^ T7[(int)( nn3        & 0xFFL)] ^ Kr2;

        w3 = T0[(int)((nn3 >> 56) & 0xFFL)]

           ^ T1[(int)((nn2 >> 48) & 0xFFL)]

           ^ T2[(int)((nn1 >> 40) & 0xFFL)]

           ^ T3[(int)((nn0 >> 32) & 0xFFL)]

           ^ T4[(int)((nn7 >> 24) & 0xFFL)]

           ^ T5[(int)((nn6 >> 16) & 0xFFL)]

           ^ T6[(int)((nn5 >>  8) & 0xFFL)]