/* Blowfish.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.  */

// --------------------------------------------------------------------------
//
// Based on the C implementation from the GNU Privacy Guard.
//
// --------------------------------------------------------------------------

package gnu.javax.crypto.cipher;

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

import java.util.Collections;
import java.util.Iterator;

/**
 * Blowfish is a 16-round, 64-bit Feistel cipher designed by Bruce Schneier. It
 * accepts a variable-length key of up to 448 bits.
 * <p>
 * References:
 * <ol>
 * <li>Schneier, Bruce: <i>Applied Cryptography</i>, Second Edition, 336--339,
 * 647--654 (1996 Bruce Schneier).</li>
 * <li><a href="http://www.counterpane.com/blowfish.html">The Blowfish
 * Encryption Algorithm.</a></li>
 * </ol>
 */
public class Blowfish
    extends BaseCipher
{
  private static final int DEFAULT_BLOCK_SIZE = 8;
  private static final int DEFAULT_KEY_SIZE = 8;
  private static final int MAX_KEY_LENGTH = 56;
  /** Initial value of the p-array. */
  private static final int[] P = {
      0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0,
      0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
      0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b };
  /** Initial value of S-box 1. */
  static final int[] KS0 = {
      0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96,
      0xba7c9045, 0xf12c7f99, 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
      0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e, 0x0d95748f, 0x728eb658,
      0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
      0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e,
      0x6c9e0e8b, 0xb01e8a3e, 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
      0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440, 0x55ca396a, 0x2aab10b6,
      0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
      0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c,
      0x7a325381, 0x28958677, 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
      0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, 0xef845d5d, 0xe98575b1,
      0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
      0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a,
      0x670c9c61, 0xabd388f0, 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
      0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, 0xa1f1651d, 0x39af0176,
      0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
      0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706,
      0x1bfedf72, 0x429b023d, 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
      0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, 0xe3fe501a, 0xb6794c3b,
      0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
      0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c,
      0xcc814544, 0xaf5ebd09, 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
      0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, 0x5579c0bd, 0x1a60320a,
      0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
      0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760,
      0x53317b48, 0x3e00df82, 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
      0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, 0x695b27b0, 0xbbca58c8,
      0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
      0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33,
      0x62fb1341, 0xcee4c6e8, 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
      0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, 0xd08ed1d0, 0xafc725e0,
      0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
      0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777,
      0xea752dfe, 0x8b021fa1, 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
      0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, 0x165fa266, 0x80957705,
      0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
      0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e,
      0x226800bb, 0x57b8e0af, 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
      0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, 0x83260376, 0x6295cfa9,
      0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
      0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f,
      0xf296ec6b, 0x2a0dd915, 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
      0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a };
  /** Initial value of S-box 2. */
  private static final int[] KS1 = {
      0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d,
      0x9cee60b8, 0x8fedb266, 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
      0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e, 0x3f54989a, 0x5b429d65,
      0x6b8fe4d6, 0x99f73fd6, 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
      0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9,
      0x3c971814, 0x6b6a70a1, 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
      0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8, 0xb03ada37, 0xf0500c0d,
      0xf01c1f04, 0x0200b3ff, 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
      0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc,
      0xc8b57634, 0x9af3dda7, 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
      0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331, 0x4e548b38, 0x4f6db908,
      0x6f420d03, 0xf60a04bf, 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
      0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124,
      0x501adde6, 0x9f84cd87, 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
      0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2, 0xef1c1847, 0x3215d908,
      0xdd433b37, 0x24c2ba16, 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
      0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b,
      0x3c11183b, 0x5924a509, 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
      0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3, 0x771fe71c, 0x4e3d06fa,
      0x2965dcb9, 0x99e71d0f, 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
      0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d,
      0x1939260f, 0x19c27960, 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
      0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28, 0xc332ddef, 0xbe6c5aa5,
      0x65582185, 0x68ab9802, 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
      0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96,
      0x0334fe1e, 0xaa0363cf, 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
      0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e, 0x648b1eaf, 0x19bdf0ca,
      0xa02369b9, 0x655abb50, 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
      0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77,
      0x11ed935f, 0x16681281, 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
      0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696, 0xcdb30aeb, 0x532e3054,
      0x8fd948e4, 0x6dbc3128, 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
      0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea,
      0xdb6c4f15, 0xfacb4fd0, 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
      0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250, 0xcf62a1f2, 0x5b8d2646,
      0xfc8883a0, 0xc1c7b6a3, 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
      0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea,
      0x1dadf43e, 0x233f7061, 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
      0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e, 0xa6078084, 0x19f8509e,
      0xe8efd855, 0x61d99735, 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
      0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd,
      0x675fda79, 0xe3674340, 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
      0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7 };
  /** Initial value of S-box 3. */
  private static final int[] KS2 = {
      0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, 0x411520f7, 0x7602d4f7,
      0xbcf46b2e, 0xd4a20068, 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
      0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840, 0x4d95fc1d, 0x96b591af,
      0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
      0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, 0x28507825, 0x530429f4,
      0x0a2c86da, 0xe9b66dfb, 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
      0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6, 0xaace1e7c, 0xd3375fec,
      0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
      0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, 0x3a6efa74, 0xdd5b4332,
      0x6841e7f7, 0xca7820fb, 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
      0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b, 0x55a867bc, 0xa1159a58,
      0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
      0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, 0x95c11548, 0xe4c66d22,
      0x48c1133f, 0xc70f86dc, 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
      0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564, 0x257b7834, 0x602a9c60,
      0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
      0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, 0x85b2a20e, 0xe6ba0d99,
      0xde720c8c, 0x2da2f728, 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
      0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e, 0x0a476341, 0x992eff74,
      0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
      0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, 0xf1290dc7, 0xcc00ffa3,
      0xb5390f92, 0x690fed0b, 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
      0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb, 0x37392eb3, 0xcc115979,
      0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
      0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, 0x1a6b1018, 0x11caedfa,
      0x3d25bdd8, 0xe2e1c3c9, 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
      0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe, 0x9dbc8057, 0xf0f7c086,
      0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
      0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, 0x77a057be, 0xbde8ae24,
      0x55464299, 0xbf582e61, 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
      0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9, 0x7aeb2661, 0x8b1ddf84,
      0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
      0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, 0xb77f19b6, 0xe0a9dc09,
      0x662d09a1, 0xc4324633, 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
      0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169, 0xdcb7da83, 0x573906fe,
      0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
      0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, 0xf0177a28, 0xc0f586e0,
      0x006058aa, 0x30dc7d62, 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
      0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76, 0x6f05e409, 0x4b7c0188,
      0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
      0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, 0x1e50ef5e, 0xb161e6f8,
      0xa28514d9, 0x6c51133c, 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
      0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0 };
  /** Initial value of S-box 4. */
  private static final int[] KS3 = {
      0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742,
      0xd3822740, 0x99bc9bbe, 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
      0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4, 0x5748ab2f, 0xbc946e79,
      0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
      0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a,
      0x63ef8ce2, 0x9a86ee22, 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
      0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6, 0x2826a2f9, 0xa73a3ae1,
      0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
      0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797,
      0x2cf0b7d9, 0x022b8b51, 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
      0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c, 0xe029ac71, 0xe019a5e6,
      0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
      0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba,
      0x03a16125, 0x0564f0bd, 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
      0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319, 0x7533d928, 0xb155fdf5,
      0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
      0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce,
      0x5121ce64, 0x774fbe32, 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
      0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166, 0xb39a460a, 0x6445c0dd,
      0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
      0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb,
      0x8d6612ae, 0xbf3c6f47, 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
      0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d, 0x4040cb08, 0x4eb4e2cc,
      0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
      0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc,
      0xbb3a792b, 0x344525bd, 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
      0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7, 0x1a908749, 0xd44fbd9a,
      0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
      0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a,
      0x0f91fc71, 0x9b941525, 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
      0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442, 0xe0ec6e0e, 0x1698db3b,
      0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
      0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e,
      0xe60b6f47, 0x0fe3f11d, 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
      0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299, 0xf523f357, 0xa6327623,
      0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
      0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a,
      0x45e1d006, 0xc3f27b9a, 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
      0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b, 0x53113ec0, 0x1640e3d3,
      0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
      0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c,
      0x01c36ae4, 0xd6ebe1f9, 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
      0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6 };
  /** Cache of the self test. */
  private static Boolean valid;
  /**
   * Test vector, as published in
   * href="http://www.counterpane.com/vectors.txt">http://www.counterpane.com/vectors.txt</a>.
   *
   * KEY=0000000000000000
   * PT=0000000000000000
   * CT=4EF997456198DD78
   */
  private static final byte[] TV_KEY = Util.toBytesFromString("0000000000000000");
  private static final byte[] TV_CT = Util.toBytesFromString("4EF997456198DD78");

  public Blowfish()
  {
    super(Registry.BLOWFISH_CIPHER, DEFAULT_BLOCK_SIZE, DEFAULT_KEY_SIZE);
  }

  public Object clone()
  {
    Blowfish result = new Blowfish();
    result.currentBlockSize = currentBlockSize;
    return result;
  }

  public Iterator keySizes()
  {
    return new Sequence(8, MAX_KEY_LENGTH, 8).iterator();
  }

  public Iterator blockSizes()
  {
    return Collections.singleton(Integer.valueOf(DEFAULT_BLOCK_SIZE)).iterator();
  }

  public Object makeKey(byte[] k, int bs)
  {
    Context ctx = new Context();
    System.arraycopy(P, 0, ctx.p, 0, P.length);
    System.arraycopy(KS0, 0, ctx.s0, 0, KS0.length);
    System.arraycopy(KS1, 0, ctx.s1, 0, KS1.length);
    System.arraycopy(KS2, 0, ctx.s2, 0, KS2.length);
    System.arraycopy(KS3, 0, ctx.s3, 0, KS3.length);
    // XOR the key with the P-box
    int l = 0;
    for (int i = 0; i < ctx.p.length; i++)
      {
        int data = 0;
        for (int j = 0; j < 4; j++)
          {
            data = (data << 8) | (k[l++] & 0xff);
            if (l >= k.length)
              l = 0;
          }
        ctx.p[i] ^= data;
      }
    // We swap the left and right words here only, so we can avoid
    // swapping altogether during encryption/decryption.
    int t;
    Block x = new Block();
    x.left = x.right = 0;
    for (int i = 0; i < ctx.p.length; i += 2)
      {
        blowfishEncrypt(x, ctx);
        ctx.p[i] = x.right;
        ctx.p[i + 1] = x.left;
        t = x.right;
        x.right = x.left;
        x.left = t;
      }
    for (int i = 0; i < ctx.s0.length; i += 2)
      {
        blowfishEncrypt(x, ctx);
        ctx.s0[i] = x.right;
        ctx.s0[i + 1] = x.left;
        t = x.right;
        x.right = x.left;
        x.left = t;
      }
    for (int i = 0; i < ctx.s1.length; i += 2)
      {
        blowfishEncrypt(x, ctx);
        ctx.s1[i] = x.right;
        ctx.s1[i + 1] = x.left;
        t = x.right;
        x.right = x.left;
        x.left = t;
      }
    for (int i = 0; i < ctx.s2.length; i += 2)
      {
        blowfishEncrypt(x, ctx);
        ctx.s2[i] = x.right;
        ctx.s2[i + 1] = x.left;
        t = x.right;
        x.right = x.left;
        x.left = t;
      }
    for (int i = 0; i < ctx.s3.length; i += 2)
      {
        blowfishEncrypt(x, ctx);
        ctx.s3[i] = x.right;
        ctx.s3[i + 1] = x.left;
        t = x.right;
        x.right = x.left;
        x.left = t;
      }
    x.left = x.right = 0;
    return ctx;
  }

  public void encrypt(byte[] in, int i, byte[] out, int o, Object k, int bs)
  {
    Block x = new Block();
    x.left =  (in[i    ] & 0xff) << 24
            | (in[i + 1] & 0xff) << 16
            | (in[i + 2] & 0xff) <<  8
            | (in[i + 3] & 0xff);
    x.right = (in[i + 4] & 0xff) << 24
            | (in[i + 5] & 0xff) << 16
            | (in[i + 6] & 0xff) <<  8
            | (in[i + 7] & 0xff);
    blowfishEncrypt(x, (Context) k);
    out[o    ] = (byte)(x.right >>> 24);
    out[o + 1] = (byte)(x.right >>> 16);
    out[o + 2] = (byte)(x.right >>>  8);
    out[o + 3] = (byte) x.right;
    out[o + 4] = (byte)(x.left >>> 24);
    out[o + 5] = (byte)(x.left >>> 16);
    out[o + 6] = (byte)(x.left >>>  8);
    out[o + 7] = (byte) x.left;
    x.left = x.right = 0;
  }

  public void decrypt(byte[] in, int i, byte[] out, int o, Object k, int bs)
  {
    Block x = new Block();
    x.left =  (in[i    ] & 0xff) << 24
            | (in[i + 1] & 0xff) << 16
            | (in[i + 2] & 0xff) <<  8
            | (in[i + 3] & 0xff);
    x.right = (in[i + 4] & 0xff) << 24
            | (in[i + 5] & 0xff) << 16
            | (in[i + 6] & 0xff) <<  8
            | (in[i + 7] & 0xff);
    blowfishDecrypt(x, (Context) k);
    out[o    ] = (byte)(x.right >>> 24);
    out[o + 1] = (byte)(x.right >>> 16);
    out[o + 2] = (byte)(x.right >>>  8);
    out[o + 3] = (byte) x.right;
    out[o + 4] = (byte)(x.left >>> 24);
    out[o + 5] = (byte)(x.left >>> 16);
    out[o + 6] = (byte)(x.left >>>  8);
    out[o + 7] = (byte) x.left;
    x.left = x.right = 0;
  }

  /** Encrypt a single pair of 32-bit integers. */
  private void blowfishEncrypt(Block x, Context ctx)
  {
    int[] p = ctx.p;
    int[] s0 = ctx.s0, s1 = ctx.s1, s2 = ctx.s2, s3 = ctx.s3;
    x.left ^= p[0];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[1];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[2];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[3];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[4];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[5];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[6];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[7];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[8];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[9];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[10];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[11];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[12];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[13];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[14];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[15];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[16];
    x.right ^= p[17];
  }

  /** Decrypt a single pair of 32-bit integers. */
  private void blowfishDecrypt(Block x, Context ctx)
  {
    int[] p = ctx.p;
    int[] s0 = ctx.s0, s1 = ctx.s1, s2 = ctx.s2, s3 = ctx.s3;
    x.left ^= p[17];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[16];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[15];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[14];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[13];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[12];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[11];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[10];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[9];
    x.right ^= ((s0[x.left  >>> 24]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[8];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[7];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[6];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[5];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[4];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[3];
    x.right ^= ((s0[x.left  >>> 24       ]
               + s1[x.left  >>> 16 & 0xff])
               ^ s2[x.left  >>>  8 & 0xff])
               + s3[x.left         & 0xff] ^ p[2];
    x.left ^=  ((s0[x.right >>> 24       ]
               + s1[x.right >>> 16 & 0xff])
               ^ s2[x.right >>>  8 & 0xff])
               + s3[x.right        & 0xff] ^ p[1];
    x.right ^= p[0];
  }

  public boolean selfTest()
  {
    if (valid == null)
      {
        boolean result = super.selfTest(); // symmetry
        if (result)
          result = testKat(TV_KEY, TV_CT);
        valid = Boolean.valueOf(result);
      }
    return valid.booleanValue();
  }

  /** A simple wrapper for the P- and S-boxes. */
  private class Context
      implements Cloneable
  {
    /** The P-array. */
    int[] p, s0, s1, s2, s3;

    /** Default 0-arguments constructor. */
    Context()
    {
      p = new int[18];
      s0 = new int[256];
      s1 = new int[256];
      s2 = new int[256];
      s3 = new int[256];
    }

    /**
     * Private constructor for cloneing.
     *
     * @param that The instance being cloned.
     */
    private Context(Context that)
    {
      this.p = (int[]) that.p.clone();
      this.s0 = (int[]) that.s0.clone();
      this.s1 = (int[]) that.s1.clone();
      this.s2 = (int[]) that.s2.clone();
      this.s3 = (int[]) that.s3.clone();
    }

    public Object clone()
    {
      return new Context(this);
    }
  }

  private class Block
  {
    int left, right;
  }
}