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/* Rijndael.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.Configuration;

import gnu.java.security.Registry;

import gnu.java.security.util.Util;

import java.security.InvalidKeyException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.logging.Logger;

/**

 * Rijndael --pronounced Reindaal-- is the AES. It is a variable block-size

 * (128-, 192- and 256-bit), variable key-size (128-, 192- and 256-bit)

 * symmetric key block cipher.

 * <p>

 * References:

 * <ol>

 * <li><a href="http://www.esat.kuleuven.ac.be/~rijmen/rijndael/">The Rijndael

 * Block Cipher - AES Proposal</a>.<br>

 * <a href="mailto:vincent.rijmen@esat.kuleuven.ac.be">Vincent Rijmen</a> and

 * <a href="mailto:daemen.j@protonworld.com">Joan Daemen</a>.</li>

 * </ol>

 */

public final class Rijndael

    extends BaseCipher

{

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

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

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

  private static final String SS =

      "\u637C\u777B\uF26B\u6FC5\u3001\u672B\uFED7\uAB76"

    + "\uCA82\uC97D\uFA59\u47F0\uADD4\uA2AF\u9CA4\u72C0"

    + "\uB7FD\u9326\u363F\uF7CC\u34A5\uE5F1\u71D8\u3115"

    + "\u04C7\u23C3\u1896\u059A\u0712\u80E2\uEB27\uB275"

    + "\u0983\u2C1A\u1B6E\u5AA0\u523B\uD6B3\u29E3\u2F84"

    + "\u53D1\u00ED\u20FC\uB15B\u6ACB\uBE39\u4A4C\u58CF"

    + "\uD0EF\uAAFB\u434D\u3385\u45F9\u027F\u503C\u9FA8"

    + "\u51A3\u408F\u929D\u38F5\uBCB6\uDA21\u10FF\uF3D2"

    + "\uCD0C\u13EC\u5F97\u4417\uC4A7\u7E3D\u645D\u1973"

    + "\u6081\u4FDC\u222A\u9088\u46EE\uB814\uDE5E\u0BDB"

    + "\uE032\u3A0A\u4906\u245C\uC2D3\uAC62\u9195\uE479"

    + "\uE7C8\u376D\u8DD5\u4EA9\u6C56\uF4EA\u657A\uAE08"

    + "\uBA78\u252E\u1CA6\uB4C6\uE8DD\u741F\u4BBD\u8B8A"

    + "\u703E\uB566\u4803\uF60E\u6135\u57B9\u86C1\u1D9E"

    + "\uE1F8\u9811\u69D9\u8E94\u9B1E\u87E9\uCE55\u28DF"

    + "\u8CA1\u890D\uBFE6\u4268\u4199\u2D0F\uB054\uBB16";

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

  private static final byte[] Si = new byte[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[] T8 = new int[256];

  private static final int[] U1 = new int[256];

  private static final int[] U2 = new int[256];

  private static final int[] U3 = new int[256];

  private static final int[] U4 = new int[256];

  private static final byte[] rcon = new byte[30];

  private static final int[][][] shifts = new int[][][] {

      { { 0, 0 }, { 1, 3 }, { 2, 2 }, { 3, 1 } },

      { { 0, 0 }, { 1, 5 }, { 2, 4 }, { 3, 3 } },

      { { 0, 0 }, { 1, 7 }, { 3, 5 }, { 4, 4 } } };

  /**

   * KAT vector (from ecb_vk): I=96

   * KEY=0000000000000000000000010000000000000000000000000000000000000000

   * CT=E44429474D6FC3084EB2A6B8B46AF754

   */

  private static final byte[] KAT_KEY = Util.toBytesFromString(

      "0000000000000000000000010000000000000000000000000000000000000000");

  private static final byte[] KAT_CT = Util.toBytesFromString(

      "E44429474D6FC3084EB2A6B8B46AF754");

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

  private static Boolean valid;

  static

    {

      long time = System.currentTimeMillis();

      int ROOT = 0x11B;

      int i, j = 0;

      // S-box, inverse S-box, T-boxes, U-boxes

      int s, s2, s3, i2, i4, i8, i9, ib, id, ie, t;

      char c;

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

        {

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

          S[i] = (byte)(((i & 1) == 0) ? c >>> 8 : c & 0xFF);

          s = S[i] & 0xFF;

          Si[s] = (byte) i;

          s2 = s << 1;

          if (s2 >= 0x100)

            s2 ^= ROOT;

          s3 = s2 ^ s;

          i2 = i << 1;

          if (i2 >= 0x100)

            i2 ^= ROOT;

          i4 = i2 << 1;

          if (i4 >= 0x100)

            i4 ^= ROOT;

          i8 = i4 << 1;

          if (i8 >= 0x100)

            i8 ^= ROOT;

          i9 = i8 ^ i;

          ib = i9 ^ i2;

          id = i9 ^ i4;

          ie = i8 ^ i4 ^ i2;

          T1[i] = t = (s2 << 24) | (s << 16) | (s << 8) | s3;

          T2[i] = (t >>>  8) | (t << 24);

          T3[i] = (t >>> 16) | (t << 16);

          T4[i] = (t >>> 24) | (t <<  8);

          T5[s] = U1[i] = t = (ie << 24) | (i9 << 16) | (id << 8) | ib;

          T6[s] = U2[i] = (t >>>  8) | (t << 24);

          T7[s] = U3[i] = (t >>> 16) | (t << 16);

          T8[s] = U4[i] = (t >>> 24) | (t <<  8);

        }

      // round constants

      int r = 1;

      rcon[0] = 1;

      for (i = 1; i < 30; i++)

        {

          r <<= 1;

          if (r >= 0x100)

            r ^= ROOT;

          rcon[i] = (byte) r;

        }

      time = System.currentTimeMillis() - time;

      if (Configuration.DEBUG)

        {

          log.fine("Static Data");

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

          StringBuilder sb;

          for (i = 0; i < 16; i++)

            {

              sb = new StringBuilder();

              for (j = 0; j < 16; j++)

                sb.append("0x").append(Util.toString(S[i * 16 + j])).append(", ");

              log.fine(sb.toString());

            }

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

          for (i = 0; i < 16; i++)

            {

              sb = new StringBuilder();

              for (j = 0; j < 16; j++)

                sb.append("0x").append(Util.toString(Si[i * 16 + j])).append(", ");

              log.fine(sb.toString());

            }

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

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

            {

              sb = new StringBuilder();

              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 StringBuilder();

              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 StringBuilder();

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

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

              log.fine(sb.toString());

            }

          log.fine("T4[]:");

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

            {

              sb = new StringBuilder();

              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 StringBuilder();

              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 StringBuilder();

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

                sb.append("0x").append(Util.toString(T6[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

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

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

            {

              sb = new StringBuilder();

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

                sb.append("0x").append(Util.toString(T7[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("T8[]:");

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

            {

              sb = new StringBuilder();

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

                sb.append("0x").append(Util.toString(T8[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("U1[]:");

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

            {

              sb = new StringBuilder();

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

                sb.append("0x").append(Util.toString(U1[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("U2[]:");

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

            {

              sb = new StringBuilder();

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

                sb.append("0x").append(Util.toString(U2[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("U3[]:");

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

            {

              sb = new StringBuilder();

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

                sb.append("0x").append(Util.toString(U3[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

          log.fine("U4[]:");

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

            {

              sb = new StringBuilder();

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

                sb.append("0x").append(Util.toString(U4[i * 4 + j])).append(", ");

              log.fine(sb.toString());

            }

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

          for (i = 0; i < 5; i++)

            {

              sb = new StringBuilder();

              for (j = 0; j < 6; j++)

                sb.append("0x").append(Util.toString(rcon[i * 6 + j])).append(", ");

              log.fine(sb.toString());

            }

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

        }

    }

  /** Trivial 0-arguments constructor. */

  public Rijndael()

  {

    super(Registry.RIJNDAEL_CIPHER, DEFAULT_BLOCK_SIZE, DEFAULT_KEY_SIZE);

  }

  /**

   * Returns the number of rounds for a given Rijndael's key and block sizes.

   *

   * @param ks the size of the user key material in bytes.

   * @param bs the desired block size in bytes.

   * @return the number of rounds for a given Rijndael's key and block sizes.

   */

  public static int getRounds(int ks, int bs)

  {

    switch (ks)

      {

      case 16:

        return bs == 16 ? 10 : (bs == 24 ? 12 : 14);

      case 24:

        return bs != 32 ? 12 : 14;

      default: // 32 bytes = 256 bits

        return 14;

      }

  }

  private static void rijndaelEncrypt(byte[] in, int inOffset, byte[] out,

                                      int outOffset, Object sessionKey, int bs)

  {

    Object[] sKey = (Object[]) sessionKey; // extract encryption round keys

    int[][] Ke = (int[][]) sKey[0];

    int BC = bs / 4;

    int ROUNDS = Ke.length - 1;

    int SC = BC == 4 ? 0 : (BC == 6 ? 1 : 2);

    int s1 = shifts[SC][1][0];

    int s2 = shifts[SC][2][0];

    int s3 = shifts[SC][3][0];

    int[] a = new int[BC];

    int[] t = new int[BC]; // temporary work array

    int i, tt;

    for (i = 0; i < BC; i++) // plaintext to ints + key

      t[i] = (in[inOffset++]         << 24

           | (in[inOffset++] & 0xFF) << 16

           | (in[inOffset++] & 0xFF) <<  8

           | (in[inOffset++] & 0xFF)      ) ^ Ke[0][i];

    for (int r = 1; r < ROUNDS; r++) // apply round transforms

      {

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

          a[i] = (T1[(t[ i           ] >>> 24)       ]

                ^ T2[(t[(i + s1) % BC] >>> 16) & 0xFF]

                ^ T3[(t[(i + s2) % BC] >>>  8) & 0xFF]

                ^ T4[ t[(i + s3) % BC]         & 0xFF]) ^ Ke[r][i];

        System.arraycopy(a, 0, t, 0, BC);

        if (Configuration.DEBUG)

          log.fine("CT" + r + "=" + Util.toString(t));

      }

    for (i = 0; i < BC; i++) // last round is special

      {

        tt = Ke[ROUNDS][i];

        out[outOffset++] = (byte)(S[(t[ i           ] >>> 24)       ] ^ (tt >>> 24));

        out[outOffset++] = (byte)(S[(t[(i + s1) % BC] >>> 16) & 0xFF] ^ (tt >>> 16));

        out[outOffset++] = (byte)(S[(t[(i + s2) % BC] >>>  8) & 0xFF] ^ (tt >>>  8));

        out[outOffset++] = (byte)(S[ t[(i + s3) % BC]         & 0xFF] ^  tt        );

      }

    if (Configuration.DEBUG)

      log.fine("CT=" + Util.toString(out, outOffset - bs, bs));

  }

  private static void rijndaelDecrypt(byte[] in, int inOffset, byte[] out,

                                      int outOffset, Object sessionKey, int bs)

  {

    Object[] sKey = (Object[]) sessionKey; // extract decryption round keys

    int[][] Kd = (int[][]) sKey[1];

    int BC = bs / 4;

    int ROUNDS = Kd.length - 1;

    int SC = BC == 4 ? 0 : (BC == 6 ? 1 : 2);

    int s1 = shifts[SC][1][1];

    int s2 = shifts[SC][2][1];

    int s3 = shifts[SC][3][1];

    int[] a = new int[BC];

    int[] t = new int[BC]; // temporary work array

    int i, tt;

    for (i = 0; i < BC; i++) // ciphertext to ints + key

      t[i] = (in[inOffset++]         << 24

           | (in[inOffset++] & 0xFF) << 16

           | (in[inOffset++] & 0xFF) <<  8

           | (in[inOffset++] & 0xFF)      ) ^ Kd[0][i];

    for (int r = 1; r < ROUNDS; r++) // apply round transforms

      {

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

          a[i] = (T5[(t[ i           ] >>> 24)       ]

                ^ T6[(t[(i + s1) % BC] >>> 16) & 0xFF]

                ^ T7[(t[(i + s2) % BC] >>>  8) & 0xFF]

                ^ T8[ t[(i + s3) % BC]         & 0xFF]) ^ Kd[r][i];

        System.arraycopy(a, 0, t, 0, BC);

        if (Configuration.DEBUG)

          log.fine("PT" + r + "=" + Util.toString(t));

      }

    for (i = 0; i < BC; i++) // last round is special

      {

        tt = Kd[ROUNDS][i];

        out[outOffset++] = (byte)(Si[(t[ i           ] >>> 24)       ] ^ (tt >>> 24));

        out[outOffset++] = (byte)(Si[(t[(i + s1) % BC] >>> 16) & 0xFF] ^ (tt >>> 16));

        out[outOffset++] = (byte)(Si[(t[(i + s2) % BC] >>>  8) & 0xFF] ^ (tt >>>  8));

        out[outOffset++] = (byte)(Si[ t[(i + s3) % BC]         & 0xFF] ^  tt        );

      }

    if (Configuration.DEBUG)

      log.fine("PT=" + Util.toString(out, outOffset - bs, bs));

  }

  private static void aesEncrypt(byte[] in, int i, byte[] out, int j, Object key)

  {

    int[][] Ke = (int[][])((Object[]) key)[0]; // extract encryption round keys

    int ROUNDS = Ke.length - 1;

    int[] Ker = Ke[0];

    // plaintext to ints + key

    int t0 = (in[i++]         << 24

           | (in[i++] & 0xFF) << 16

           | (in[i++] & 0xFF) <<  8

           | (in[i++] & 0xFF)      ) ^ Ker[0];

    int t1 = (in[i++]         << 24

           | (in[i++] & 0xFF) << 16

           | (in[i++] & 0xFF) <<  8

           | (in[i++] & 0xFF)      ) ^ Ker[1];

    int t2 = (in[i++]         << 24

           | (in[i++] & 0xFF) << 16

           | (in[i++] & 0xFF) <<  8

           | (in[i++] & 0xFF)      ) ^ Ker[2];

    int t3 = (in[i++]         << 24

           | (in[i++] & 0xFF) << 16

           | (in[i++] & 0xFF) <<  8

           | (in[i++] & 0xFF)      ) ^ Ker[3];

    int a0, a1, a2, a3;

    for (int r = 1; r < ROUNDS; r++) // apply round transforms

      {

        Ker = Ke[r];

        a0 = (T1[(t0 >>> 24)       ]

            ^ T2[(t1 >>> 16) & 0xFF]

            ^ T3[(t2 >>>  8) & 0xFF]

            ^ T4[ t3         & 0xFF]) ^ Ker[0];

        a1 = (T1[(t1 >>> 24)       ]

            ^ T2[(t2 >>> 16) & 0xFF]

            ^ T3[(t3 >>>  8) & 0xFF]

            ^ T4[ t0         & 0xFF]) ^ Ker[1];

        a2 = (T1[(t2 >>> 24)       ]

            ^ T2[(t3 >>> 16) & 0xFF]

            ^ T3[(t0 >>>  8) & 0xFF]

            ^ T4[ t1         & 0xFF]) ^ Ker[2];

        a3 = (T1[(t3 >>> 24)       ]

            ^ T2[(t0 >>> 16) & 0xFF]

            ^ T3[(t1 >>>  8) & 0xFF]

            ^ T4[ t2         & 0xFF]) ^ Ker[3];

        t0 = a0;

        t1 = a1;

        t2 = a2;

        t3 = a3;

        if (Configuration.DEBUG)

          log.fine("CT" + r + "=" + Util.toString(t0) + Util.toString(t1)

                   + Util.toString(t2) + Util.toString(t3));

      }

    // last round is special

    Ker = Ke[ROUNDS];

    int tt = Ker[0];

    out[j++] = (byte)(S[(t0 >>> 24)       ] ^ (tt >>> 24));

    out[j++] = (byte)(S[(t1 >>> 16) & 0xFF] ^ (tt >>> 16));

    out[j++] = (byte)(S[(t2 >>>  8) & 0xFF] ^ (tt >>>  8));

    out[j++] = (byte)(S[ t3         & 0xFF] ^  tt        );

    tt = Ker[1];

    out[j++] = (byte)(S[(t1 >>> 24)       ] ^ (tt >>> 24));

    out[j++] = (byte)(S[(t2 >>> 16) & 0xFF] ^ (tt >>> 16));

    out[j++] = (byte)(S[(t3 >>>  8) & 0xFF] ^ (tt >>>  8));

    out[j++] = (byte)(S[ t0         & 0xFF] ^  tt        );