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/* 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();

    }